JP4200711B2 - Silver halide photographic material for heat development - Google Patents
Silver halide photographic material for heat development Download PDFInfo
- Publication number
- JP4200711B2 JP4200711B2 JP2002232778A JP2002232778A JP4200711B2 JP 4200711 B2 JP4200711 B2 JP 4200711B2 JP 2002232778 A JP2002232778 A JP 2002232778A JP 2002232778 A JP2002232778 A JP 2002232778A JP 4200711 B2 JP4200711 B2 JP 4200711B2
- Authority
- JP
- Japan
- Prior art keywords
- silver halide
- acid
- silver
- polymer
- heat development
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- -1 Silver halide Chemical class 0.000 title claims description 120
- 229910052709 silver Inorganic materials 0.000 title claims description 97
- 239000004332 silver Substances 0.000 title claims description 97
- 239000000463 material Substances 0.000 title claims description 65
- 238000011161 development Methods 0.000 title claims description 54
- 239000010410 layer Substances 0.000 claims description 70
- 229920000642 polymer Polymers 0.000 claims description 48
- 239000011241 protective layer Substances 0.000 claims description 29
- 239000000203 mixture Substances 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 14
- 125000001570 methylene group Chemical group [H]C([H])([*:1])[*:2] 0.000 claims description 11
- 229920005596 polymer binder Polymers 0.000 claims description 11
- 239000002491 polymer binding agent Substances 0.000 claims description 11
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical group O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 9
- 238000007334 copolymerization reaction Methods 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 239000000243 solution Substances 0.000 description 61
- 238000000576 coating method Methods 0.000 description 43
- 238000000034 method Methods 0.000 description 40
- 239000011248 coating agent Substances 0.000 description 39
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 36
- 239000000975 dye Substances 0.000 description 33
- 150000001875 compounds Chemical class 0.000 description 30
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 27
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- 239000000178 monomer Substances 0.000 description 25
- GGCZERPQGJTIQP-UHFFFAOYSA-N sodium;9,10-dioxoanthracene-2-sulfonic acid Chemical compound [Na+].C1=CC=C2C(=O)C3=CC(S(=O)(=O)O)=CC=C3C(=O)C2=C1 GGCZERPQGJTIQP-UHFFFAOYSA-N 0.000 description 24
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 22
- 238000002360 preparation method Methods 0.000 description 18
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- 239000002253 acid Substances 0.000 description 15
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- 239000006185 dispersion Substances 0.000 description 13
- 125000000217 alkyl group Chemical group 0.000 description 12
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- IOLCXVTUBQKXJR-UHFFFAOYSA-M potassium bromide Chemical compound [K+].[Br-] IOLCXVTUBQKXJR-UHFFFAOYSA-M 0.000 description 8
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 7
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 7
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- 230000015572 biosynthetic process Effects 0.000 description 6
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 6
- UKMSUNONTOPOIO-UHFFFAOYSA-N docosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCCCC(O)=O UKMSUNONTOPOIO-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 239000003999 initiator Substances 0.000 description 6
- FQPSGWSUVKBHSU-UHFFFAOYSA-N methacrylamide Chemical compound CC(=C)C(N)=O FQPSGWSUVKBHSU-UHFFFAOYSA-N 0.000 description 6
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 6
- 230000008313 sensitization Effects 0.000 description 6
- 206010070834 Sensitisation Diseases 0.000 description 5
- 125000002947 alkylene group Chemical group 0.000 description 5
- 150000001787 chalcogens Chemical class 0.000 description 5
- 239000013078 crystal Substances 0.000 description 5
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- 229920000728 polyester Polymers 0.000 description 5
- 239000002243 precursor Substances 0.000 description 5
- 150000003254 radicals Chemical class 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 5
- 229910052708 sodium Inorganic materials 0.000 description 5
- 239000011734 sodium Substances 0.000 description 5
- 239000004094 surface-active agent Substances 0.000 description 5
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 4
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- 239000003431 cross linking reagent Substances 0.000 description 4
- 239000012153 distilled water Substances 0.000 description 4
- IPCSVZSSVZVIGE-UHFFFAOYSA-N hexadecanoic acid Chemical compound CCCCCCCCCCCCCCCC(O)=O IPCSVZSSVZVIGE-UHFFFAOYSA-N 0.000 description 4
- 229920001519 homopolymer Polymers 0.000 description 4
- VKOBVWXKNCXXDE-UHFFFAOYSA-N icosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCC(O)=O VKOBVWXKNCXXDE-UHFFFAOYSA-N 0.000 description 4
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 4
- LFSXCDWNBUNEEM-UHFFFAOYSA-N phthalazine Chemical compound C1=NN=CC2=CC=CC=C21 LFSXCDWNBUNEEM-UHFFFAOYSA-N 0.000 description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 description 4
- WVIICGIFSIBFOG-UHFFFAOYSA-N pyrylium Chemical compound C1=CC=[O+]C=C1 WVIICGIFSIBFOG-UHFFFAOYSA-N 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 125000000547 substituted alkyl group Chemical group 0.000 description 4
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
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- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
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- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 3
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- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
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- 125000002777 acetyl group Chemical class [H]C([H])([H])C(*)=O 0.000 description 3
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- UACSZOWTRIJIFU-UHFFFAOYSA-N hydroxymethyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCO UACSZOWTRIJIFU-UHFFFAOYSA-N 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 description 3
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- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 3
- QYZFTMMPKCOTAN-UHFFFAOYSA-N n-[2-(2-hydroxyethylamino)ethyl]-2-[[1-[2-(2-hydroxyethylamino)ethylamino]-2-methyl-1-oxopropan-2-yl]diazenyl]-2-methylpropanamide Chemical compound OCCNCCNC(=O)C(C)(C)N=NC(C)(C)C(=O)NCCNCCO QYZFTMMPKCOTAN-UHFFFAOYSA-N 0.000 description 3
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- 150000004706 metal oxides Chemical class 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- ZQMHJBXHRFJKOT-UHFFFAOYSA-N methyl 2-[(1-methoxy-2-methyl-1-oxopropan-2-yl)diazenyl]-2-methylpropanoate Chemical compound COC(=O)C(C)(C)N=NC(C)(C)C(=O)OC ZQMHJBXHRFJKOT-UHFFFAOYSA-N 0.000 description 1
- MPHUYCIKFIKENX-UHFFFAOYSA-N methyl 2-ethenylbenzoate Chemical compound COC(=O)C1=CC=CC=C1C=C MPHUYCIKFIKENX-UHFFFAOYSA-N 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 235000010981 methylcellulose Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 235000019426 modified starch Nutrition 0.000 description 1
- HEOJXQORMIVKQQ-UHFFFAOYSA-N n-(2-cyanoethyl)-2-methylprop-2-enamide Chemical compound CC(=C)C(=O)NCCC#N HEOJXQORMIVKQQ-UHFFFAOYSA-N 0.000 description 1
- SWSFFBPGDIHBJL-UHFFFAOYSA-N n-(2-methoxyethyl)-2-methylprop-2-enamide Chemical compound COCCNC(=O)C(C)=C SWSFFBPGDIHBJL-UHFFFAOYSA-N 0.000 description 1
- OMNKZBIFPJNNIO-UHFFFAOYSA-N n-(2-methyl-4-oxopentan-2-yl)prop-2-enamide Chemical compound CC(=O)CC(C)(C)NC(=O)C=C OMNKZBIFPJNNIO-UHFFFAOYSA-N 0.000 description 1
- DNTMQTKDNSEIFO-UHFFFAOYSA-N n-(hydroxymethyl)-2-methylprop-2-enamide Chemical compound CC(=C)C(=O)NCO DNTMQTKDNSEIFO-UHFFFAOYSA-N 0.000 description 1
- DCBBWYIVFRLKCD-UHFFFAOYSA-N n-[2-(dimethylamino)ethyl]-2-methylprop-2-enamide Chemical compound CN(C)CCNC(=O)C(C)=C DCBBWYIVFRLKCD-UHFFFAOYSA-N 0.000 description 1
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- VQGWOOIHSXNRPW-UHFFFAOYSA-N n-butyl-2-methylprop-2-enamide Chemical compound CCCCNC(=O)C(C)=C VQGWOOIHSXNRPW-UHFFFAOYSA-N 0.000 description 1
- JBLADNFGVOKFSU-UHFFFAOYSA-N n-cyclohexyl-2-methylprop-2-enamide Chemical compound CC(=C)C(=O)NC1CCCCC1 JBLADNFGVOKFSU-UHFFFAOYSA-N 0.000 description 1
- ZIWDVJPPVMGJGR-UHFFFAOYSA-N n-ethyl-2-methylprop-2-enamide Chemical compound CCNC(=O)C(C)=C ZIWDVJPPVMGJGR-UHFFFAOYSA-N 0.000 description 1
- RCLLINSDAJVOHP-UHFFFAOYSA-N n-ethyl-n',n'-dimethylprop-2-enehydrazide Chemical compound CCN(N(C)C)C(=O)C=C RCLLINSDAJVOHP-UHFFFAOYSA-N 0.000 description 1
- 125000004123 n-propyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- QQZXAODFGRZKJT-UHFFFAOYSA-N n-tert-butyl-2-methylprop-2-enamide Chemical compound CC(=C)C(=O)NC(C)(C)C QQZXAODFGRZKJT-UHFFFAOYSA-N 0.000 description 1
- KHARCSTZAGNHOT-UHFFFAOYSA-N naphthalene-2,3-dicarboxylic acid Chemical compound C1=CC=C2C=C(C(O)=O)C(C(=O)O)=CC2=C1 KHARCSTZAGNHOT-UHFFFAOYSA-N 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 150000004010 onium ions Chemical group 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 150000002924 oxiranes Chemical class 0.000 description 1
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 229920006287 phenoxy resin Polymers 0.000 description 1
- 239000013034 phenoxy resin Substances 0.000 description 1
- QIWKUEJZZCOPFV-UHFFFAOYSA-N phenyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OC1=CC=CC=C1 QIWKUEJZZCOPFV-UHFFFAOYSA-N 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- WRAQQYDMVSCOTE-UHFFFAOYSA-N phenyl prop-2-enoate Chemical compound C=CC(=O)OC1=CC=CC=C1 WRAQQYDMVSCOTE-UHFFFAOYSA-N 0.000 description 1
- 125000004437 phosphorous atom Chemical group 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- LGRFSURHDFAFJT-UHFFFAOYSA-N phthalic anhydride Chemical class C1=CC=C2C(=O)OC(=O)C2=C1 LGRFSURHDFAFJT-UHFFFAOYSA-N 0.000 description 1
- XKJCHHZQLQNZHY-UHFFFAOYSA-N phthalimide Chemical compound C1=CC=C2C(=O)NC(=O)C2=C1 XKJCHHZQLQNZHY-UHFFFAOYSA-N 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000011197 physicochemical method Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920000768 polyamine Chemical class 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 239000003505 polymerization initiator Substances 0.000 description 1
- 229920000193 polymethacrylate Polymers 0.000 description 1
- 150000008442 polyphenolic compounds Chemical class 0.000 description 1
- 235000013824 polyphenols Nutrition 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 235000011056 potassium acetate Nutrition 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 125000001501 propionyl group Chemical group O=C([*])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000012966 redox initiator Substances 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000005070 ripening Effects 0.000 description 1
- 239000010979 ruby Substances 0.000 description 1
- 229910001750 ruby Inorganic materials 0.000 description 1
- CVHZOJJKTDOEJC-UHFFFAOYSA-N saccharin Chemical compound C1=CC=C2C(=O)NS(=O)(=O)C2=C1 CVHZOJJKTDOEJC-UHFFFAOYSA-N 0.000 description 1
- 229940081974 saccharin Drugs 0.000 description 1
- 235000019204 saccharin Nutrition 0.000 description 1
- 239000000901 saccharin and its Na,K and Ca salt Substances 0.000 description 1
- 229960004889 salicylic acid Drugs 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- AQRYNYUOKMNDDV-UHFFFAOYSA-M silver behenate Chemical compound [Ag+].CCCCCCCCCCCCCCCCCCCCCC([O-])=O AQRYNYUOKMNDDV-UHFFFAOYSA-M 0.000 description 1
- ADZWSOLPGZMUMY-UHFFFAOYSA-M silver bromide Chemical compound [Ag]Br ADZWSOLPGZMUMY-UHFFFAOYSA-M 0.000 description 1
- 229940045105 silver iodide Drugs 0.000 description 1
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 1
- ORYURPRSXLUCSS-UHFFFAOYSA-M silver;octadecanoate Chemical compound [Ag+].CCCCCCCCCCCCCCCCCC([O-])=O ORYURPRSXLUCSS-UHFFFAOYSA-M 0.000 description 1
- 238000007767 slide coating Methods 0.000 description 1
- 239000000661 sodium alginate Substances 0.000 description 1
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- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000010129 solution processing Methods 0.000 description 1
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- 229960004274 stearic acid Drugs 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000011115 styrene butadiene Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
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- 125000005504 styryl group Chemical group 0.000 description 1
- 125000005156 substituted alkylene group Chemical group 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229960002317 succinimide Drugs 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 0.000 description 1
- 238000010557 suspension polymerization reaction Methods 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical compound CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- AUHHYELHRWCWEZ-UHFFFAOYSA-N tetrachlorophthalic anhydride Chemical compound ClC1=C(Cl)C(Cl)=C2C(=O)OC(=O)C2=C1Cl AUHHYELHRWCWEZ-UHFFFAOYSA-N 0.000 description 1
- UIERETOOQGIECD-ONEGZZNKSA-N tiglic acid Chemical compound C\C=C(/C)C(O)=O UIERETOOQGIECD-ONEGZZNKSA-N 0.000 description 1
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Landscapes
- Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
Description
【0001】
【発明の属する技術分野】
本発明は、保護層の物性を改良した有機銀を含有する熱現像用ハロゲン化銀写真感光材料に関する。
【0002】
【従来の技術】
従来から広範囲に用いられているハロゲン化銀写真感光材料は、その優れた写真特性により、より広範囲かつ高品質な素材として画像形成分野に利用されているが、画像を形成するために現像、定着、水洗、乾燥というプロセスが必要であり、しかも処理工程が湿式であるため、作業が煩雑であるという欠点があった。その為、現像工程を熱処理で行う熱現像用ハロゲン化銀写真感光材料が開発、実用化され、近年医用業界を中心に急速に普及してきている。
【0003】
かかる技術として、例えば、米国特許第3,152,904号明細書、同3,487,075号明細書、D.モーガン(Morgan)による「ドライシルバー写真材料(Dry Silver Photographic Materials)」(Handbook of Imaging Materials,Marcel Dekker,Inc.p48,1991)等に記載されているように、支持体上に有機銀塩、感光性ハロゲン化銀粒子および還元剤を有する銀塩光熱写真ドライイメージング材料が知られている。この銀塩光熱写真ドライイメージング材料(熱現像用ハロゲン化銀写真感光材料と同義)では溶液系処理薬品を一切使用しないため、より簡便なシステムをユーザーに提供することができる。
【0004】
一般に熱現像用ハロゲン化銀写真感光材料は、画像様に露光した後、感光層の画像部の有機銀塩を還元するため均一に加熱する工程が必要であり、この工程として非接触で加熱する熱風現像やマイクロウエーブ現像もあるが、多くは熱ローラーに接触させて加熱現像される。このとき、感光面と熱ローラーとの接触で傷が付かないようにすること、および感光層の添加物が揮発や溶融により表面に拡散し、これが熱ローラーに付着して汚れを生じないようにすることが重要となっている。
【0005】
このため保護層の結合剤を架橋させて付着を防止させることが考えられ、架橋技術として米国特許第4,886,739号、同4,942,115号、同5,264,334号等の各明細書にポリアルコキシシラン化合物を使用することが開示されている。これらの化合物は熱で加水分解され、露出したヒドロキシ基が結合剤と結合して架橋強化されることが述べられている。しかしながら、上記熱で加水分解が行われた際、アルコールや水分が放出され、これらが支持体に拡散して、支持体がカールを生じるので搬送不良を引き起こす。その対策として水分やアルコール分の拡散防止層を必要とする等の欠点を生じた。
【0006】
他方、米国特許第4,828,971号、同5,891,610号等の各明細書にはポリケイ酸化合物を使用することが述べられている。この化合物はポリアルコキシシランよりも加水分解性は低いが、乾燥後の膜がひび割れを生じ易い等の欠点がある。そこで、熱現像材料の膜表面の改質として米国特許第3,489,567号、同3,885,965号等の各明細書にはポリシロキサン化合物を滑剤として添加することが開示されている。しかし、これらにおいては熱現像材料の膜表面の滑りがよくなるとはいえ、該熱現像材料の耐傷性や該熱現像材料の添加物の熱ローラーへの付着による汚れ等については全く検討されていない。米国特許第6,350,561号明細書には、エポキシ基を含有するフィルム形成性のアクリレートまたはメタクリレート系ポリマーからなるバリアー層を熱現像材料に適用し、熱現像時に表面に拡散してくる化合物(例えば、ベヘン酸のような脂肪酸)の減少を図っているが、十分な効果が得られていない。
【0007】
【発明が解決しようとする課題】
従って本発明の目的は、熱現像による汚れの発生が少ない熱現像用ハロゲン化銀写真感光材料を提供することにある。
【0008】
【課題を解決するための手段】
本発明の上記目的は、以下の構成によって達成された。
【0009】
1) 支持体上に感光層および保護層を含む写真構成層を有する熱現像用ハロゲン化銀写真感光材料において、前記保護層は活性メチレン基を有するポリマーを、保護層の高分子結合剤と混合後の質量%を100とした時の比率が75〜100の範囲で含有することを特徴とする熱現像用ハロゲン化銀写真感光材料。(第1の本発明)
2) 支持体上に感光層および保護層を含む写真構成層を有する熱現像用ハロゲン化銀写真感光材料において、前記保護層は無水マレイン酸ユニットを共重合成分として有するポリマーを、保護層の高分子結合剤と混合後の質量%を100とした時の比率が75〜100の範囲で含有することを特徴とする熱現像用ハロゲン化銀写真感光材料。(第2の本発明)
以下の説明では、特に断りのない限り第1の本発明と第2の本発明を合わせて本発明という。
【0010】
本発明を更に詳しく説明する。
第1の本発明における活性メチレン基を有するポリマーの構造は、特に下記一般式[1]で表されるものが好ましい。
【0011】
一般式[1] −(A1)x−(B1)y−(C1)z−
式中、A1は下記一般式[2]で表される活性メチレン基を有するエチレン性不飽和モノマーより誘導される繰り返し単位を表す。B1は単独重合体のガラス転移温度が35℃以下であるメタクリル酸エステル、アクリル酸エステル、マレイン酸エステルから選ばれるエチレン性不飽和モノマーより誘導される繰り返し単位を表す。C1は単独重合体のガラス転移温度が35℃を越えるエチレン性不飽和モノマーより誘導される繰り返し単位を表す。ここでx、y、zはそれぞれポリマー中の各成分の質量百分率比を表し、それぞれ0.5≦x≦45、0≦y≦60、20≦z≦95、x+y+z=100を表す。
【0012】
【化1】
【0013】
式中、R1は水素原子、炭素数1〜4のアルキル基またはハロゲン原子を表し、Lは単結合または二価の連結基を表し、具体的には下式で表される。
【0014】
−(L1)m−(L2)n−
L1は−CON(R2)−(R2は水素原子、炭素数1〜4のアルキル基、または炭素数1〜6の置換アルキル基を表す)、−COO−、−NHCO−、−OCO−、
【0015】
【化2】
【0016】
ここで、R2は上記と同義、R3およびR4はそれぞれ独立に、水素、ヒドロキシル、ハロゲン原子、置換または無置換のアルキル、アルコキシ、アシルオキシもしくはアリールオキシを表す。L2はL1とXを結ぶ連結基を表す。mは0または1を表し、nは0または1を表す。
【0017】
L2で表される連結基は具体的には、下記の一般式で表される。
−[X1−(J1−X2)p−(J2−X3)q−(J3)r]s−
式中、J1、J2およびJ3は同じでも異なっていてもよく、−CO−、−SO2−、−CON(R5)−(R5は水素原子、炭素数1〜6のアルキル基、炭素数1〜6の置換アルキル基)、−SO2N(R5)−(R5は上記と同義)、−N(R5)−R6−(R5は上記と同義、R6は炭素数1〜4のアルキレン基)、−N(R5)−R6−N(R7)−(R5、R6は上記と同義、R7は水素原子、炭素数1〜6のアルキル基、炭素数1〜6の置換アルキル基を表す。)、−O−、−S−、−N(R5)−CO−N(R7)−(R5、R7は上記と同義)、−N(R5)−SO2N(R7)−(R5、R7は上記と同義)、−COO−、−OCO−、−N(R5)CO2−(R5は上記と同義)、−N(R5)CO−(R5は上記と同義)等を挙げることができる。
【0018】
p、q、rおよびsは0または1を表す。X1、X2およびX3は互いに同じでも異なっていてもよく、炭素数1〜10の無置換もしくは置換のアルキレン基、アラルキレン基、またはフェニレン基を表し、アルキレン基は直鎖でも分岐でもよい。アルキレン基としては例えばメチレン、メチルメチレン、ジメチルメチレン、ジメチレン、トリメチレン、テトラメチレン、ペンタメチレン、ヘキサメチレン、デシルメチレン、アラルキレン基としては例えばベンジリデン、フェニレン基としては例えばp−フェニレン、m−フェニレン、メチルフェニレンなどがある。
【0019】
Xは、活性メチレン基を含む一価の基を表し、好ましい具体例としては、R8−CO−CH2−COO−、CN−CH2−COO−、R8−CO−CH2−CO−、R8−CO−CH2−CON(R5)−等を挙げることができる。ここでR5は前記に同じであり、R8は炭素数1〜12個の置換または無置換のアルキル基(例えばメチル、エチル、n−プロピル、n−ブチル、t−ブチル、n−ノニル、2−メトキシエチル、4−フェノキシブチル、ベンジル、2−メタンスルホンアミドエチル等)、置換または無置換のアリール基(例えばフェニル、p−メチルフェニル、p−メトキシフェニル、o−クロロフェニル等)、アルコキシ基(例えば、メトキシ、エトキシ、メトキシエトキシ、n−ブトキシ等)、シクロアルキルオキシ基(例えばシクロヘキシルオキシ)、アリロキシ(例えばフェノキシ、p−メチルフェノキシ、o−クロロフェノキシ、p−シアノフェノキシ等)、アミノ基、置換アミノ基(例えばメチルアミノ、エチルアミノ、ジメチルアミノ、ブチルアミノ等)を表す。
【0020】
以下に、前記一般式[1]で表されるポリマーにおいて、A1で表される活性メチレン基を有するエチレン性不飽和モノマーを例示するが、これらに限定されるものではない。
【0021】
MN−1:2−アセトアセトキシエチルメタクリレート
MN−2:2−アセトアセトキシエチルアクリレート
MN−3:2−アセトアセトキシプロピルメタクリレート
MN−4:2−アセトアセトキシプロピルアクリレート
MN−5:2−アセトアセトアミドエチルメタクリレート
MN−6:2−アセトアセトアミドエチルアクリレート
MN−7:2−シアノアセトキシエチルメタクリレート
MN−8:2−シアノアセトキシエチルアクリレート
MN−9:N−(2−シアノアセトキシエチル)アクリルアミド
MN−10:2−プロピオニルアセトキシエチルアクリレート
MN−11:N−(2−プロピオニルアセトキシエチル)メタクリルアミド
MN−12:N−4−(アセトアセトキシベンジル)フェニルアクリルアミド
MN−13:エチルアクリロイルアセテート
MN−14:アクリロイルメチルアセテート
MN−15:N−メタクリロイルオキシメチルアセトアセトアミド
MN−16:エチルメタクリロイルアセトアセテート
MN−17:N−アリルシアノアセトアミド
MN−18:メチルアクリロイルアセトアセテート
MN−19:N−(2−メタクリロイルオキシエチル)シアノアセトアミド
MN−20:p−(2−アセトアセチル)エチルスチレン
MN−21:4−アセトアセチル−1−メタクリロイルピペラジン
MN−22:エチル−α−アセトアセトキシメタクリレート
MN−23:N−ブチル−N−アクリロイルオキシエチルアセトアセトアミド
MN−24:p−(2−アセトアセトキシ)エチルスチレン
一般式[1]のB1で表される繰り返し単位を与えるエチレン性不飽和モノマーは、その単独重合体のガラス転移温度が35℃以下となるようなモノマーであり、具体的には、アルキルアクリレート(例えば、メチルアクリレート、エチルアクリレート、n−ブチルアクリレート、n−ヘキシルアクリレート、ベンジルアクリレート、2−エチルヘキシルアクリレート、iso−ノニルアクリレート、n−ドデシルアクリレートなど)、アルキルメタクリレート(例えば、n−ブチルメタクリレート、n−ヘキシルメタクリレート、2−エチルヘキシルメタクリレート、iso−ノニルメタクリレート、n−ドデシルメタクリレートなど)、ジエン類(例えばブタジエン、イソプレン等)などを挙げることができる。
【0022】
更に好ましいモノマーとしては単独重合体のガラス転移温度が10℃以下のモノマーであり、このようなモノマーとしては炭素数2以上のアルキル側鎖を有するアルキルアクリレート(例えば、エチルアクリレート、n−ブチルアクリレート、2−エチルヘキシルアクリレート、iso−ノニルアクリレート等)、炭素数6以上のアルキル側鎖を有するアルキルメタクリレート(例えば、n−ヘキシルメタクリレート、2−エチルヘキシルメタクリレート等)、ジエン類(例えばブタジエン、イソプレン)を特に好ましい例として挙げることができる。これらのモノマーは2種以上併用しても良い。
【0023】
上記のポリマーのガラス転移温度の値については、J.Brandrup、E.H.Immergut共編「Polymer Handbook」第3版(John Wily & Sons,1989年)VI/209〜VI/277頁に記載されている。
【0024】
一般式[1]のC1で表される繰り返し単位は単独重合体のガラス転移温度が35℃を超えるモノマーより誘導される繰り返し単位を表す。
【0025】
具体的には、アクリル酸エステル類(例えば、t−ブチルアクリレート、フェニルアクリレート、2−ナフチルアクリレート等)、メタクリル酸エステル類(例えばメチルメタクリレート、エチルメタクリレート、2−ヒドロキシエチルメタクリレート、ベンジルメタクリレート、2−ヒドロキシプロピルメタクリレート、フェニルメタクリレート、シクロへキシルメタクリレート、クレジルメタクリレート、4−クロロベンジルメタクリレート、エチレングリコールジメタクリレート等)、ビニルエステル類(例えば、安息香酸ビニル、ピバロイルオキシエチレン等)、アクリルアミド類(例えば、アクリルアミド、メチルアクリルアミド、エチルアクリルアミド、プロピルアクリルアミド、ブチルアクリルアミド、tert−ブチルアクリルアミド、シクロヘキシルアクリルアミド、ベンジルアクリルアミド、ヒドロキシメチルアクリルアミド、メトキシエチルアクリルアミド、ジメチルアミノエチルアクリルアミド、フェニルアクリルアミド、ジメチルアクリルアミド、ジエチルアクリルアミド、β−シアノエチルアクリルアミド、ジアセトンアクリルアミド等)、メタクリルアミド類(例えば、メタクリルアミド、メチルメタクリルアミド、エチルメタクリルアミド、プロピルメタクリルアミド、ブチルメタクリルアミド、tert−ブチルメタクリルアミド、シクロヘキシルメタクリルアミド、ベンジルメタクリルアミド、ヒドロキシメチルメタクリルアミド、メトキシエチルメタクリルアミド、ジメチルアミノエチルメタクリルアミド、フェニルメタクリルアミド、ジメチルメタクリルアミド、ジエチルメタクリルアミド、β−シアノエチルメタクリルアミド等)、スチレン類(例えば、スチレン、メチルスチレン、ジメチルスチレン、トリメチレンスチレン、エチルスチレン、イソプロピルスチレン、クロロスチレン、メトキシスチレン、アセトキシスチレン、クロルスチレン、ジクロルスチレン、ブロムスチレン、ビニル安息香酸メチルエステル等)、ジビニルベンゼン、アクリロニトリル、メタアクリロニトリル、N−ビニルピロリドン、N−ビニルオキサゾリドン、塩化ビニリデン、フェニルビニルケトン等を挙げることができる。これらのモノマーは2種以上併用しても良い。
【0026】
また、前記一般式[1]で表されるポリマーは、特開昭60−15935号公報、同45−3822号公報、同53−28086号公報、米国特許第3,700,456号明細書等に記載されているようなイオン性官能基(例えば、カルボキシル基、スルホン酸基)を有するモノマーを共重合してもよい。このようなモノマーとしては、以下の化合物を挙げることができる。アクリル酸、メタクリル酸、イタコン酸、マレイン酸、イタコン酸モノアルキル(例えば、イタコン酸モノメチル、イタコン酸モノエチル等)、マレイン酸モノアルキル(例えば、マレイン酸モノメチル、マレイン酸モノエチル等)、シトラコン酸、スチレンスルホン酸、ビニルベンジルスルホン酸、ビニルスルホン酸、アクリロイルオキシアルキルスルホン酸(例えば、アクリロイルオキシメチルスルホン酸、アクリロイルオキシエチルスルホン酸、アクリロイルオキシプロピルスルホン酸等)、メタクリロイルオキシアルキルスルホン酸(例えば、メタクリロイルオキシメチルスルホン酸、メタクリロイルオキシエチルスルホン酸、メタクリロイルオキシプロピルスルホン酸等)、アクリルアミドアルキルスルホン酸(例えば、2−アクリルアミド−2−メチルエタンスルホン酸、2−アクリルアミド−2−メチルプロパンスルホン酸、2−アクリルアミド−2−メチルブタンスルホン酸等)、メタクリルアミドアルキルスルホン酸(例えば、2−メタクリルアミド−2−メチルエタンスルホン酸、2−メタクリルアミド−2−メチルプロパンスルホン酸、2−メタクリルアミド−2−メチルブタンスルホン酸等)等である。また、これらの酸はアルカリ金属塩(例えば、Na、K等)またはアンモニウム塩であってもよい。これらのモノマーの好ましい量は、ポリマーの全質量に対し、0〜20質量%、特に好ましくは0〜10質量%である。
【0027】
第2の本発明における無水マレイン酸ユニットをコポリマー成分として有するポリマーの構造は、特に下記一般式[3]で表されるものが好ましい。
【0028】
【化3】
【0029】
式中、M+は、水素イオンまたはナトリウム、カリウム、リチウム等の金属イオンを表し、R10は水素原子、炭素数1〜6のアルキル基、炭素数1〜6の置換アルキル基を表す。B2は前記一般式[1]のB1と同義であり、C2は前記一般式[1]のC1と同義である。x1、x2、y1およびz1はポリマー中の各成分の質量百分率比を表し、それぞれ0.5≦x1≦50、0≦x2≦10、0≦y1≦60、20≦z1≦95、x1+x2+y1+z1=100を表す。
【0030】
また、本発明の一般式[3]で表されるポリマーは、イオン性官能基を有するモノマーを共重合してもよい。このようなモノマーとしては、以下の化合物を挙げることができる。アクリル酸、メタクリル酸、イタコン酸、イタコン酸モノアルキル(例えば、イタコン酸モノメチル、イタコン酸モノエチル等)、マレイン酸モノアルキル(例えば、マレイン酸モノメチル、マレイン酸モノエチル等)、シトラコン酸、スチレンスルホン酸、ビニルベンジルスルホン酸、ビニルスルホン酸、アクリロイルオキシアルキルスルホン酸(例えば、アクリロイルオキシメチルスルホン酸、アクリロイルオキシエチルスルホン酸、アクリロイルオキシプロピルスルホン酸等)、メタクリロイルオキシアルキルスルホン酸(例えば、メタクリロイルオキシメチルスルホン酸、メタクリロイルオキシエチルスルホン酸、メタクリロイルオキシプロピルスルホン酸等)、アクリルアミドアルキルスルホン酸(例えば、2−アクリルアミド−2−メチルエタンスルホン酸、2−アクリルアミド−2−メチルプロパンスルホン酸、2−アクリルアミド−2−メチルブタンスルホン酸等)、メタクリルアミドアルキルスルホン酸(例えば、2−メタクリルアミド−2−メチルエタンスルホン酸、2−メタクリルアミド−2−メチルプロパンスルホン酸、2−メタクリルアミド−2−メチルブタンスルホン酸等)等である。また、これらの酸はアルカリ金属塩(例えば、Na、K等)またはアンモニウム塩であってもよい。これらのモノマーの好ましい量は、ポリマーの全質量に対し、0〜20質量%、特に好ましくは0〜10質量%である。
【0031】
第1の本発明に用いる活性メチレン基を有するポリマーは、上記一般式[1]で表される組成を満たすことが好ましい。また、第2の本発明に用いる無水マレイン酸を共重合成分として有するポリマーは、上記一般式[3]で表される組成を満たすことが好ましい。
【0032】
第1の本発明に用いる活性メチレン基を有するポリマーは、y≧60のとき、ポリマーのガラス転移温度が著しく低くなる。また、第2の本発明に用いる無水マレイン酸を共重合成分として有するポリマーは、y1≧60のとき、ポリマーのガラス転移温度が著しく低くなる。バインダー中にこのようなガラス転移温度が低いポリマーが存在すると、その添加量によっては、本発明の目的が十分発揮できない場合がある。本発明の目的を達成するためには、本発明のポリマーのガラス転移温度は−10℃以上であることが好ましく、さらに好ましくは20℃以上である。
【0033】
ポリマーのガラス転移温度は、例えばJ.Brandrup、E.H.Immergut共著「Polymer Handbook,2nd Edition,III−139〜III−192(1975)」に詳細に記載されている。
【0034】
共重合体のガラス転移温度(Tg)は、下式により求めることができる。
1/Tg=a1/Tg1+a2/Tg2+a3/Tg3+・・・an/Tgn
Tgn;モノマーnの単独重合体のTg
an:ポリマー中のモノマーnの質量分率を表し、a1+a2+a3+・・・an=1である。
【0035】
これらのポリマーは、溶液重合、懸濁重合、乳化重合等の各種重合方法で得ることができる。これらの中で、溶液重合は、界面活性剤などの第3成分の混入が少なく好ましい。溶液重合法で用いられる溶剤は、例えば酢酸エチル、メタノール、エタノール、1−プロパノール、2−プロパノール、1−ブタノール、アセトン、ジオキサン、N,N−ジメチルホルムアミド、N,N−ジメチルアセトアミド、ベンゼン、トルエン、アセトニトリル、塩化メチレン、クロロホルム、ジクロロエタンメチルエチルケトンのような種々の有機溶剤の単独あるいは2種以上の混合物でも良いし、水との混合溶媒としても良い。
【0036】
重合温度は生成するポリマーの分子量、開始剤の種類などと関連して設定する必要があり、通常30〜100℃の範囲で重合を行なう。
【0037】
重合に用いられるラジカル開始剤としては、例えば、2,2′−アゾビスイソブチロニトリル、2,2′−アゾビス(2,4−ジメチルバレロニトリル)、2,2′−アゾビス(2−アミジノプロパン)ジハイドロクロライド、4,4′−アゾビス(4−シアノペンタノイックアシッド)のようなアゾ系開始剤や、ベンゾイルパーオキサイド、t−ブチルハイドロパーオキサイド、過硫酸カリウム(例えば、亜硫酸水素ナトリウムと組み合わせてレドックス開始剤として用いても良い)のようなペルオキシド系開始剤が好ましい。本発明では半減期が10時間になる温度が70℃以下の開始剤(例えば2,2′−アゾビス(2,4−ジメチルバレロニトリル)、2,2′−アゾビス(4−メトキシ−2,4−ジメチルバレロニトリル)、ジメチル2,2′−アゾビス(2−メチルプロピオネート)、2,2′−アゾビス[2−(3,4,5,6−テトラヒドロプロパン)ジハイドロクロライド]等)が特に好ましい。
【0038】
重合開始剤の使用量はモノマーの重合性や必要とする重合体の分子量に応じて調節することが可能であるが、単量体に対して0.01〜5.0mol%の範囲が好ましい。本発明のポリマーの合成においてはA、BおよびCを形成するモノマーを混合して最初に反応容器に入れておき、開始剤を投入してもよいし、これらのモノマーを重合溶媒に滴下する過程を経て重合を行なってもよい。
【0039】
第1の本発明に使用する活性メチレン基を有するポリマーについては表1に、また第2の本発明に使用する無水マレイン酸ユニットを共重合成分として有するポリマーについては表2に例示するが、これらに限定されるものではない。
【0040】
【表1】
【0041】
【表2】
【0042】
【化4】
【0043】
本発明において、保護層とは、感光層をはさみ支持体と反対側に設けられた層である。保護層の厚さは特に限定されないが、おおむね0.5〜10μm、好ましくは1〜5μmである。第1の本発明においては、保護層に含有する第1の本発明に使用する活性メチレン基を有するポリマーは単独で使用してもよく、また、他の高分子結合剤と併用してもよい。高分子結合剤と併用する場合、第1の本発明に使用する活性メチレン基を有するポリマーの混合比率は、混合後の質量%を100とした場合、10〜100質量%が好ましく、さらに好ましくは20〜100質量%である。
【0044】
第2の本発明においては、保護層に含有する第2の本発明に使用する無水マレイン酸ユニットを共重合成分として有するポリマーは単独で使用してもよく、また、他の高分子結合剤と併用してもよい。高分子結合剤と併用する場合、第2の本発明に使用する無水マレイン酸ユニットを共重合成分として有するポリマーの混合比率は、混合後の質量%を100とした場合、10〜100質量%が好ましく、さらに好ましくは20〜100質量%である。
【0045】
以下に、熱現像用ハロゲン化銀写真感光材料の構成について説明する。
本発明の熱現像用ハロゲン化銀写真感光材料は、通常は支持体上に少なくとも1層の感光層および該感光層に隣接する上層に保護層を設けた少なくとも2層から構成されて、また感光層の反対側には必要に応じて適宜バックコート層(BC層)等が設けられている。上記熱現像用ハロゲン化銀写真感光材料の感光層中には、分光増感色素で増感されてもよい感光性ハロゲン化銀粒子が含まれ、さらに感光層またはその隣接層には銀源となる有機銀塩、銀塩を現像して銀画像を形成するための還元剤が含有される。熱現像用ハロゲン化銀写真感光材料の感光層やその隣接層には、熱現像の場を提供する高分子結合剤、親水性結合剤や疎水性結合剤、或いはラテックスが含有される。上記の熱現像用ハロゲン化銀写真感光材料において、必要によりイラジエーション防止またはハレーション防止のための染料を含有するアンチイラジエーション層(AI層)またはBC層が設けられる。また、上記の熱現像用ハロゲン化銀写真感光材料の感光層には、必要により銀画像の色調を整える色調剤を含有させることができる。
【0046】
本発明の熱現像材料の感光層等の写真構成層に用いられる高分子結合剤としては、ハロゲン化銀、有機銀塩、還元剤が反応する場として好ましい素材、熱消色性染料が80〜200℃以下の熱で消色する反応に好ましい素材、あるいは塩基発生前駆体化合物が熱により速やかに塩基を発生するような素材が選択される。上記高分子結合剤としては例えばメタノールやエタノール等のアルコール類、メチルエチルケトンやアセトン等のケトン類、ジメチルスルホキシドやジメチルホルムアミド等を含む極性溶媒に溶解して用いられるポリマーと、水分散系ポリマーとがあり、本発明の熱現像材料の高分子結合剤としては、水分散系ポリマーが好ましい。また、好ましいポリマーの組成について更にガラス転移点が−20℃から100℃が好ましく、特に−5℃から80℃が好ましい。ガラス転移点が高いと熱現像する温度が高くなり、低いとカブリが発生し易く感度の低下や軟調になるからである。
【0047】
上記極性溶媒等に溶解して用いられるポリマーとしては例えば、ヒドロキシエチルセルロース、カルボキシメチルセルロース、メチルセルロース、エチルセルロースなどのセルロース誘導体、デンプンおよびその誘導体、ポリビニルアルコール、変性ポリビニルアルコール、ポリビニルブチラール、ポリアクリル酸ナトリウム、ポリエチレンオキシド、アクリル酸アミド−アクリル酸エステル共重合体、スチレン−無水マレイン酸共重合体、ポリアクリルアミド、アルギン酸ナトリウム、ゼラチン、カゼイン、ポリスチレン、ポリ酢酸ビニル、ポリウレタン、ポリアクリル酸、ポリアクリル酸エステル、スチレン−ブタジエン共重合体、アクリロニトリル−ブタジエン共重合体、塩化ビニル−酢酸ビニル共重合体、スチレン−ブタジエン−アクリル共重合体などが挙げられる。更に乾燥後、膜を形成したのち、その塗膜の平衡含水率の低いものが好ましく、特に含水率の低いものとして、例えばセルロースアセテート、セルロースアセテートブチレート、ポリ(メチルメタクリル酸)などのポリ(アクリル酸エステル)類、ポリ(アクリル酸)、ポリ(メタクリル酸)、ポリ(塩化ビニル)、コポリ(スチレン−無水マレイン酸)、コポリ(スチレン−アクリロニトリル)、コポリ(スチレン−ブタジエン)、ポリ(ビニルアセタール)類(例えば、ポリ(ビニルホルマール)およびポリ(ビニルブチラール))、ポリ(エステル)類、ポリ(ウレタン)類、フェノキシ樹脂、ポリ(塩化ビニリデン)、ポリ(エポキシド)類、ポリ(カーボネート)類、ポリ(ビニルアセテート)、セルロースエステル類、ポリ(アミド)類を挙げることができる。ポリビニルブチラールは、ポリビニルアルコールをブチルアルデヒドでアセタール化したものであるが、ビニルブチラール単位として50〜90質量%有するものが好ましい。重合度としては500〜5000が好ましい。
【0048】
また、上記水分散系ポリマーとしては、平均粒子径が1nmから数μmの範囲の微粒子にして水系分散媒中に分散されたものが好ましい。水分散系ポリマーは水系塗布の結合剤として広く使用されているが、中でも耐水性を向上させることができる点からラテックスが特に好ましい。結合剤として耐水性を得る目的のラテックスの使用量は、塗布性を勘案して決められるが耐湿性の観点から多いほど好ましく、全結合剤に対して通常50〜100質量%、80〜100質量%が好ましい。
【0049】
本発明において、有機銀塩は還元可能な銀源であり、有機酸およびヘテロ有機酸の銀塩、特にこの中でも長鎖の(炭素数10〜30、好ましくは15〜25)脂肪族カルボン酸および含窒素複素環化合物の銀塩が好ましい。配位子が銀イオンに対する総安定度常数として4.0〜10.0の値をもつようなリサーチ・ディスクロージャー(以降、単にRDと略す)第17029および第29963に記載された有機または無機の錯体も好ましい。これら好適な銀塩の例としては以下のものが挙げられる。
【0050】
有機酸の銀塩、例えば、没食子酸、蓚酸、ベヘン酸、ステアリン酸、アラキジン酸、パルミチン酸、ラウリン酸等の銀塩。銀のカルボキシアルキルチオ尿素塩、例えば、1−(3−カルボキシプロピル)チオ尿素、1−(3−カルボキシプロピル)−3,3−ジメチルチオ尿素等の銀塩、アルデヒドとヒドロキシ置換芳香族カルボン酸とのポリマー反応生成物の銀塩乃至錯体、例えば、アルデヒド類(ホルムアルデヒド、アセトアルデヒド、ブチルアルデヒド等)とヒドロキシ置換酸類(例えば、サリチル酸、安息香酸、3,5−ジヒドロキシ安息香酸)の反応生成物の銀塩乃至錯体、チオン類の銀塩または錯体、例えば、3−(2−カルボキシエチル)−4−ヒドロキシメチル−4−チアゾリン−2−チオン、および3−カルボキシメチル−4−チアゾリン−2−チオン等の銀塩乃至錯体、イミダゾール、ピラゾール、ウラゾール、1,2,4−チアゾールおよび1H−テトラゾール、3−アミノ−5−ベンジルチオ−1,2,4−トリアゾールおよびベンズトリアゾールから選択される窒素酸と銀との錯体または塩、サッカリン、5−クロロサリチルアルドキシム等の銀塩、およびメルカプチド類の銀塩。これらの中、好ましい銀塩としてはベヘン酸銀、アラキジン酸銀およびステアリン酸銀があげられる。
【0051】
本発明において用いることのできる感光性ハロゲン化銀粒子について説明する。なお、本発明における感光性ハロゲン化銀粒子とは、ハロゲン化銀結晶の固有の性質として本来的に、または、人為的に物理化学的な方法により、可視光ないし赤外光を吸収し得て、かつ可視光ないし赤外光を吸収したときに当該ハロゲン化銀結晶内および/または結晶表面において物理化学的変化が起こり得るように処理製造されたハロゲン化銀結晶粒子をいう。
【0052】
本発明に用いられるハロゲン化銀粒子自体は、P.Glafkides著Chimie et Physique Photographique(PaulMontel社刊、1967年)、G.F.Duffin著 Photographic Emulsion Chemistry(The Focal Press刊、1966年)、V.L.Zelikman et al著Making and Coating Photographic Emulsion(The Focal Press刊、1964年)等に記載された方法を用いてハロゲン化銀粒子乳剤として調製することができる。即ち、酸性法、中性法、アンモニア法等のいずれでもよく、また可溶性銀塩と可溶性ハロゲン塩を反応させる形成としては、片側混合法、同時混合法、それらの組合せ等のいずれを用いてもよいが、上記方法の中でも形成条件をコントロールしつつハロゲン化銀粒子を調製する所謂コントロールドダブルジェット法が好ましい。ハロゲン組成としては特に制限はなく、塩化銀、塩臭化銀、塩沃臭化銀、臭化銀、沃臭化銀、沃化銀のいずれであってもよい。
【0053】
本発明で用いることのできるハロゲン化銀は、画像形成後の白濁を低く抑えるため、および良好な画質を得るために平均粒子サイズが小さい方が好ましく、平均粒子サイズが0.2μm以下、より好ましくは0.01μm〜0.17μm、特に0.02μm〜0.14μmが好ましい。ここでいう粒子サイズとは、ハロゲン化銀粒子が立方体或いは八面体のいわゆる正常晶である場合には、ハロゲン化銀粒子の稜の長さをいう。また、ハロゲン化銀粒子が平板状粒子である場合には主表面の投影面積と同面積の円像に換算したときの直径をいう。
【0054】
ハロゲン化銀粒子の形状としては立方体、八面体、14面体粒子、平板状粒子、球状粒子、棒状粒子、ジャガイモ状粒子などを挙げることができるが、これらの中、特に、立方体、八面体、14面体、平板状ハロゲン化銀粒子が好ましい。
【0055】
平板状ハロゲン化銀粒子を用いる場合の平均アスペクト比は好ましくは1.5以上100以下、より好ましくは2以上50以下である。これらは米国特許第5,264,337号、同第5,314,798号、同第5,320,958号等の各明細書に記載されており、容易に目的の平板状粒子を得ることができる。更に、ハロゲン化銀粒子のコーナーが丸まった粒子も好ましく用いることができる。
【0056】
本発明の熱現像用ハロゲン化銀写真感光材料に内蔵させるに好適な還元剤の例は、米国特許第3,770,448号、同第3,773,512号、同第3,593,863号の各明細書、およびRD第17029および第29963に記載されており、公知の還元剤の中から適宜選択して使用することが出来るが、有機銀塩に脂肪族カルボン酸銀塩を使用する場合には、2個以上のフェノール基がアルキレン基または硫黄によって連結されたポリフェノール類、特にフェノール基のヒドロキシ置換位置に隣接した位置の少なくとも一つにアルキル基(例えばメチル基、エチル基、プロピル基、t−ブチル基、シクロヘキシル基等)またはアシル基(例えばアセチル基、プロピオニル基等)が置換したフェノール基の2個以上がアルキレン基または硫黄によって連結されたビスフェノール類が好ましい。
【0057】
還元剤としては、上述のように、主に、ビスフェノール類やスルホンアミドフェノール類のようなプロトンをもった還元剤が用いられているので、これらの水素を引き抜くことができる活性種を発生することにより還元剤を不活性化できる化合物が含有されていることが好ましい。好適には、無色の光酸化性物質として、露光時にフリーラジカルを反応活性種として生成可能な化合物が好ましい。
【0058】
従ってこれらの機能を有する化合物であればいかなる化合物でもよいが、複数の原子からなる有機フリーラジカルが好ましい。かかる機能を有しかつ熱現像用ハロゲン化銀写真感光材料に格別の弊害を生じることのない化合物であればいかなる構造をもった化合物でもよい。
【0059】
また、これらのフリーラジカルを発生する化合物としては発生するフリーラジカルに、これが還元剤と反応し不活性化するに充分な時間接触できる位の安定性をもたせるために炭素環式、または複素環式の芳香族基を有するものが好ましい。
【0060】
本発明に用いられるハロゲン化銀粒子には、化学増感を施すことができる。例えば、特願2000−57004明細書、同2000−61942明細書に開示されている方法等により、硫黄などのカルコゲンを放出する化合物や金イオンなどの貴金属イオンを放出する貴金属化合物で化学増感中心(化学増感核)を形成付与できる。本発明においては、カルコゲン原子を含有する有機増感剤により化学増感されているのが好ましい。これらカルコゲン原子を含有する有機増感剤はハロゲン化銀へ吸着可能な基と不安定カルコゲン原子部位を有する化合物であることが好ましい。
【0061】
これらの有機増感剤としては、特開昭60−150046号、特開平4−109240号、同11−218874号等の各公報に開示されている種々の構造を有する有機増感剤を用いることができる。それらのうち、カルコゲン原子が炭素原子またはリン原子と二重結合で結ばれている構造を有する化合物の少なくとも1種であることが好ましい。
【0062】
また、上記の増感法の他、還元増感法等も用いることが出来、還元増感の具体的な化合物としてはアスコルビン酸、2酸化チオ尿素、塩化第1スズ、ヒドラジン誘導体、ボラン化合物、シラン化合物、ポリアミン化合物等を用いることができる。また、乳剤のpHを7以上またはpAgを8.3以下に保持して熟成することにより還元増感することができる。
【0063】
本発明で用いることのできる感光性ハロゲン化銀粒子には、分光増感色素を吸着させ分光増感を施すことが好ましい。分光増感色素としてシアニン色素、メロシアニン色素、コンプレックスシアニン色素、コンプレックスメロシアニン色素、ホロポーラーシアニン色素、スチリル色素、ヘミシアニン色素、オキソノール色素、ヘミオキソノール色素等を用いることができる。例えば特開昭63−159841号、同60−140335号、同63−231437号、同63−259651号、同63−304242号、同63−15245号の各公報、米国特許第4,639,414号、同第4,740,455号、同第4,741,966号、同第4,751,175号、同第4,835,096号の各明細書に記載された増感色素が使用できる。本発明に使用される有用な増感色素は、例えばRD第17643 IV−A項(1978年12月p.23)、同第18431 X項(1978年8月p.437)に記載もしくは引用された文献に記載されている。特に、各種レーザイメージャーやスキャナーの光源の分光特性に適した分光感度を有する増感色素を用いるのが好ましく、例えば、特開平9−34078号、同9−54409号、同9−80679号の各公報に記載の化合物が好ましく用いられる。
【0064】
本発明の熱現像用ハロゲン化銀写真感光材料に用いられるハロゲン化銀粒子、あるいは有機銀塩粒子を含有する乳剤は、増感色素とともに、それ自身分光増感作用をもたない色素あるいは可視光を実質的に吸収しない物質であって、強色増感効果を発現する物質を乳剤中に含ませ、これによりハロゲン化銀粒子が強色増感されていてもよい。有用な増感色素、強色増感を示す色素の組合せおよび強色増感を示す物質はRD第17643(1978年12月発行)第23頁、IVのJ項、あるいは特公平9−25500号、特公昭43−4933号、特開昭59−19032号、同59−192242号、特開平5−341432号等の各公報に記載されているものを用いることができる。本発明においては、上記の強色増感剤の他に、特願2000−70296明細書に開示されている一般式(1)で表される化合物と大環状化合物を強色増感剤として使用できる。
【0065】
本発明においては省銀化剤を用いる事が出来る。ここでいう省銀化剤とは、一定の銀画像濃度を得るために必要な銀量を低減化し得る化合物をいう。この低減化する機能の作用機構は種々考えられるが、現像銀の被覆力を向上させる機能を有する化合物が好ましい。ここで、現像銀の被覆力とは、銀の単位量当たりの光学濃度をいう。省銀化剤としては、ヒドラジン誘導体化合物、ビニル化合物、4級オニウム化合物等が好ましい例として挙げられる。
【0066】
本発明においては、また、膜付きや、現像ムラのみならず、保存時のカブリ抑制や、現像後のプリントアウト銀の生成を抑制する効果のために、架橋剤を用いることがある。本発明で用いられる架橋剤としては、従来写真感光材料用として使用されている種々の架橋剤、例えば、アルデヒド系、エポキシ系、エチレンイミン系、イソシアネート系、ビニルスルホン系、スルホン酸エステル系、アクリロイル系、カルボジイミド系、シラン系、酸無水物等の架橋剤を用いうるが、好ましいのはイソシアネート化合物、シラン化合物、エポキシ化合物または酸無水物である。
【0067】
本発明に用いられる好適な色調剤の例は、RD第17029号、米国特許第4,123,282号、同第3,994,732号、同第3,846,136号および同第4,021,249号の各明細書に開示されている。例えば、イミド類(例えば、スクシンイミド、フタルイミド、ナフタルイミド、N−ヒドロキシ−1,8−ナフタルイミド)、メルカプタン類(例えば、3−メルカプト−1,2,4−トリアゾール)、フタラジノン誘導体またはこれらの誘導体の金属塩(例えば、フタラジノン、4−(1−ナフチル)フタラジノン、6−クロロフタラジノン、5,7−ジメチルオキシフタラジノン、2,3−ジヒドロ−1,4−フタラジンジオン)、フタラジンとフタル酸類(例えば、フタル酸、4−メチルフタル酸、4−ニトロフタル酸およびテトラクロロフタル酸)の組み合わせ、フタラジンとマレイン酸無水物、およびフタル酸、2,3−ナフタレンジカルボン酸またはo−フェニレン酸誘導体およびその無水物(例えば、フタル酸、4−メチルフタル酸、4−ニトロフタル酸およびテトラクロロフタル酸無水物)から選択される少なくとも1つの化合物との組み合わせ等が挙げられる。特に好ましい色調剤としてはフタラジノンまたはフタラジンとフタル酸類、フタル酸無水物類の組み合わせである。
【0068】
本発明においては、保護層に現像前の取り扱いや熱現像後の画像の傷つき防止のためマット剤を含有することが好ましく、本発明に係るポリマーに対し、質量比で0.1〜30%含有することが好ましい。本発明において用いられるマット剤の材質は、有機物および無機物のいずれでもよい。例えば、無機物としては、スイス特許第330,158号明細書等に記載のシリカ、仏国特許第1,296,995号明細書等に記載のガラス粉、英国特許第1,173,181号明細書等に記載のアルカリ土類金属またはカドミウム、亜鉛等の炭酸塩等をマット剤として用いることができる。有機物としては、米国特許第2,322,037号明細書等に記載の澱粉、ベルギー特許第625,451号明細書や英国特許第981,198号明細書等に記載された澱粉誘導体、特公昭44−3643号公報等に記載のポリビニルアルコール、スイス特許第330,158号明細書等に記載のポリスチレン或いはポリメタアクリレート、米国特許第3,079,257号明細書等に記載のポリアクリロニトリル、米国特許第3,022,169号明細書等に記載されたポリカーボネートの様な有機マット剤を用いることができる。
【0069】
本発明においては帯電性を改良するために、金属酸化物および/または導電性ポリマーなどの導電性化合物を構成層中に含ませることができる。これらはいずれの層に含有させてもよいが、好ましくは下引層、バッキング層、感光性層と下引層の間の層などに含まれる。本発明においては米国特許第5,244,773号明細書カラム14〜20に記載された導電性化合物が好ましく用いられる。
【0070】
本発明の熱現像用ハロゲン化銀写真感光材料においては、感光層を透過する光の量または波長分布を制御するために感光層と同じ側または反対の側にフィルター層を形成するか、感光層に染料または顔料を含有させることが好ましい。
【0071】
本発明の熱現像用ハロゲン化銀写真感光材料に用いられる支持体としては、例えば、ポリエチレンテレフタレート、ポリカーボネート、ポリエチレン、ポリビニルアセタール、セルロースエステル、セルローストリアセテート、ニトロセルロース、ポリエチレンナフタレート等のプラスチックフィルム、ガラス、紙、アルミニウム板等の金属板などが用いられる。
【0072】
本発明においては、感光材料の感色性に応じて種々の波長領域の光を吸収する公知の化合物が使用できる。例えば、本発明の熱現像用ハロゲン化銀写真感光材料を赤外光による画像記録材料とする場合には、特開2000−83655公報に開示されているような、チオピリリウム核を有するスクアリリウム染料(チオピリリウムスクアリリウム染料)およびピリリウム核を有するスクアリリウム染料(ピリリウムスクアリリウム染料)、またスクアリリウム染料に類似したチオピリリウムクロコニウム染料、またはピリリウムクロコニウム染料を使用することが好ましい。
【0073】
本発明の熱現像用ハロゲン化銀写真感光材料は、上述した各構成層の素材を溶媒に溶解または分散させた塗布液を作り、それら塗布液を複数同時に重層塗布した後、乾燥処理を行って形成されることが好ましい。ここで「複数同時に重層塗布」とは、各構成層(例えば感光層、保護層)の塗布液を作製し、これを支持体へ塗布する際に各層個別に塗布、乾燥の繰り返しをするのではなく、同時に重層塗布を行い、乾燥する工程も同時に行える状態で各構成層を形成しうることを意味する。即ち、下層中の全溶剤の残存量が70質量%以下となる前に、上層を設けることである。各構成層を複数同時に重層塗布する方法には特に制限はなく、例えばバーコーター法、カーテンコート法、浸漬法、エアーナイフ法、ホッパー塗布法、エクストリュージョン塗布法などの公知の方法を用いることができる。これらのうちより好ましくはエクストリュージョン塗布法と呼ばれる前計量タイプの塗布方式である。該エクストリュージョン塗布法はスライド塗布方式のようにスライド面での揮発がないため、精密塗布、有機溶剤塗布に適している。この塗布方法は感光層を有する側について述べたが、バックコート層を設ける際、下引きとともに塗布する場合についても同様である。
【0074】
本発明において、現像条件は使用する機器、装置、或いは手段に依存して変化するが、像様に露光した熱現像用ハロゲン化銀写真感光材料を加熱現像することにより、情報定着せしめることが特徴である。露光後に得られた潜像は、中程度の高温(例えば、約80〜200℃、好ましくは約100〜200℃)で十分な時間(一般には約1秒〜約2分間)、熱現像用ハロゲン化銀写真感光材料を加熱することにより現像することができる。加熱温度が80℃未満では短時間に十分な画像濃度が得られず、また、200℃を超えるとバインダーが溶融し、ローラーへの転写など、画像そのものだけでなく搬送性や、現像機等へも悪影響を及ぼす。加熱することで有機銀塩(酸化剤として機能する)と還元剤との間の酸化還元反応により銀画像を生成する。この反応過程は、外部からの水等の処理液の一切の供給なしに進行する。
【0075】
本発明の熱現像用ハロゲン化銀写真感光材料への露光は、感色性に対し適切な光源を用いることが望ましい。例えば、赤外光に感じ得るものとした場合は、赤外光域ならば如何なる光源にも適用可能であるが、レーザパワーがハイパワーである事や、熱現像用ハロゲン化銀写真感光材料を透明にできる等の点から、赤外半導体レーザ(780nm、820nm)がより好ましく用いられる。
【0076】
本発明において、露光はレーザ走査露光により行うことが好ましいが、その露光方法には種々の方法が採用できる。例えば、第1の好ましい方法として、熱現像用ハロゲン化銀写真感光材料の露光面と走査レーザ光のなす角が実質的に垂直になることがないレーザ走査露光機を用いる方法が挙げられる。
【0077】
ここで、「実質的に垂直になることがない」とはレーザ走査中に最も垂直に近い角度として好ましくは55度以上88度以下、より好ましくは60度以上86度以下、更に好ましくは65度以上84度以下、最も好ましくは70度以上82度以下であることをいう。
【0078】
また、第2の方法として、露光は縦マルチである走査レーザ光を発するレーザ走査露光機を用いて行うことも好ましい。縦単一モードの走査レーザ光に比べて干渉縞様のムラの発生等の画質劣化が減少する。
【0079】
更に、第3の態様としては、2本以上のレーザを用いて、走査露光により画像を形成することも好ましい。このような複数本のレーザを利用した画像記録方法としては、高解像度化、高速化の要求から1回の走査で複数ラインずつ画像を書き込むレーザプリンタやデジタル複写機の画像書込み手段で使用されている技術であり、例えば特開昭60−166916号公報等により知られている。これは、光源ユニットから放射されたレーザ光をポリゴンミラーで偏向走査し、fθレンズ等を介して感光体上に結像する方法であり、これはレーザイメージャなどと原理的に同じレーザ走査光学装置である。なお、上述した各画像記録方法において、走査露光に用いるレーザとしては、一般によく知られている、ルビーレーザ、YAGレーザ、ガラスレーザ等の固体レーザ、He−Neレーザ、Arイオンレーザ、Krイオンレーザ、CO2レーザ、COレーザ、He−Cdレーザ、N2レーザ、エキシマーレーザ等の気体レーザ、InGaPレーザ、AlGaAsレーザ、GaAsPレーザ、InGaAsレーザ、InAsPレーザ、CdSnP2レーザ、GaSbレーザ等の半導体レーザ、化学レーザ、色素レーザ等を用途に併せて適時選択して使用できる。これらの中でもメンテナンスや光源の大きさの問題から、波長が600〜1200nmの半導体レーザを用いるのが好ましい。なお、レーザイメージャやレーザイメージセッタで使用されるレーザにおいて、熱現像用ハロゲン化銀写真感光材料を走査するときの露光面でのビームスポット径は、一般に短軸径として5〜75μm、長軸径として5〜100μmの範囲であり、レーザ光走査速度は熱現像用ハロゲン化銀写真感光材料に固有のレーザ発振波長における感度とレーザパワーによって、熱現像用ハロゲン化銀写真感光材料ごとに最適な値に設定することができる。
【0080】
【実施例】
以下に実施例を挙げて本発明を更に具体的に説明するが、本発明は、下記実施例のみに限定されるものではない。
【0081】
実施例
(試料No.1の熱現像用ハロゲン化銀写真感光材料の作製)
[下引き済み支持体の作製]
二軸延伸済みの厚さ175μmで、青色濃度0.175に着色されたポリエチレンテレフタレートフィルムの両面に、10W/m2・minの条件でコロナ放電処理を施し、一方の面に下記《バックコート面側下引き下層用塗布液》を乾燥膜厚0.06μmになるように塗設した後、140℃(露点温度:12℃)の乾燥風で約10秒かけて乾燥し、続いて下記《バックコート面側下引き上層用塗布液》を乾燥膜厚0.2μmになるように塗設した後、同様に乾燥した。
【0082】
また、反対側の面には下記《画像形成面側下引き下層用塗布液》を乾燥膜厚0.2μmになるように塗設した後、同様に乾燥し、続いて下記《画像形成面側下引き上層用塗布液》を乾燥膜厚0.05μmになるように塗設した後、140℃で乾燥した。これらを125℃で2分間熱処理し、下引き済み支持体を作製した。
【0083】
《バックコート面側下引き下層用塗布液》
スチレン/グリシジルメタクリレート/ブチルアクリレート
(20/20/40;質量比)の共重合体(固形分30%)15.0g
スチレン/ブチルアクリレート/ヒドロキシメチルメタクリレート
(25/45/30;質量比)の共重合体(固形分30%)4.0g
SnO2ゾル(固形分10%) 91g
(特開平10−59720号公報に記載の方法で合成)
界面活性剤(A) 0.5g
以上に蒸留水を加えて1000mlとし、塗布液とした。
【0084】
《バックコート面側下引き上層用塗布液》
変性水性ポリエステル(固形分18%) 215.0g
界面活性剤(A) 0.4g
真球状シリカマット剤 シーホスター KE−P50(日本触媒(株)製)0.3g
以上に蒸留水を加えて1000mlとし、塗布液とした。
【0085】
〈変性水性ポリエステルの調製〉
重縮合用反応容器に、テレフタル酸ジメチル35.4質量部、イソフタル酸ジメチル33.63質量部、5−スルホ−イソフタル酸ジメチルナトリウム塩17.92質量部、エチレングリコール62質量部、酢酸カルシウム一水塩0.065質量部、酢酸マンガン四水塩0.022質量部を投入し、窒素気流下において、170〜220℃でメタノールを留去しながらエステル交換反応を行った後、リン酸トリメチル0.04質量部、重縮合触媒とし三酸化アンチモン0.04質量部および1,4−シクロヘキサンジカルボン酸6.8質量部を加え、220〜235℃の反応温度で、ほぼ理論量の水を留去しエステル化を行った。その後、更に反応系内を約1時間かけて減圧、昇温し最終的に280℃、133Pa以下で約1時間重縮合を行い、変性水性ポリエステルの前駆体を得た。前駆体の固有粘度は0.33であった。
【0086】
攪拌翼、環流冷却管、温度計を付した2Lの三つ口フラスコに、純水850mlを入れ、攪拌翼を回転させながら、150gの上記前駆体を徐々に添加した。室温でこのまま30分間攪拌した後、1.5時間かけて内温が98℃になるように加熱し、この温度で3時間加熱溶解した。加熱終了後、1時間かけて室温まで冷却し、一夜放置して、固形分濃度が15質量%の溶液を調製した。
【0087】
攪拌翼、環流冷却管、温度計、滴下ロートを付した3Lの四つ口フラスコに、上記前駆体溶液1900mlを入れ、攪拌翼を回転させながら、内温度を80℃まで加熱した。この中に、過酸化アンモニウムの24%水溶液を6.52ml加え、単量体混合液(メタクリル酸グリシジル28.5g、アクリル酸エチル21.4g、メタクリル酸メチル21.4g)を30分間かけて滴下し、更に3時間反応を続けた。その後、30℃以下まで冷却し、濾過して、固形分濃度が18質量%の変性水性ポリエステルの溶液を調製した。
【0088】
《画像形成面側下引き下層用塗布液》
スチレン/ブチルアクリレート/ヒドロキシメチルメタクリレート
(25/45/30;質量比)の共重合体(固形分30%)70g
ユニトックスD−110(米国 エーカーペテロライト社製) 5.0g
界面活性剤(A) 0.3g
以上に蒸留水を加えて1000mlとし、塗布液とした。
【0089】
《画像形成面側下引き上層用塗布液》
エクセバールRS−2117(クラレ社製)の固形分5%水溶液75.0g
スチレン/ブチルアクリレート/ヒドロキシメチルメタクリレート
(25/45/30;質量比)の共重合体(固形分30%)3.0g
界面活性剤(A) 0.2g
真球状シリカマット剤 シーホスター KE−P50(日本触媒(株)製)0.3g
以上に蒸留水を加えて1000mlとし、塗布液とした。
【0090】
【化5】
【0091】
《熱現像用ハロゲン化銀写真感光材料の作製》
上記作製した下引き済み支持体を用いて、以下に示す方法で調製した各写真構成層を順次塗布した。
【0092】
(バック面側の塗布)
メチルエチルケトン(MEK)830gを攪拌しながら、セルロースアセテートブチレート(EastmanChemical社、CAB381−20)84.2gおよびポリエステル樹脂(Bostic社、VitelPE2200B)4.5gを添加し溶解した。次に、溶解した液に0.30gの赤外染料−1を添加し、さらにメタノール43.2gに溶解したF系活性剤(旭硝子社、サーフロンKH40)4.5gとF系活性剤(大日本インク社、メガファッグF120K)2.3gを添加して溶解するまで十分に攪拌を行った。最後に、MEKに1質量%の濃度でディゾルバ型ホモジナイザにて分散したシリカ(W.R.Grace社、シロイド64X6000)を75g添加し攪拌してバック面側の塗布液を調製した。
【0093】
【化6】
【0094】
このように調製したバック面塗布液を、前記作製した各プラスチックフィルムの下引層上に、乾燥膜厚が3.5μmになるように押し出しコーターにて塗布、乾燥を行った。乾燥温度100℃、露点温度10℃の乾燥風を用いて5分間かけて乾燥した。
【0095】
(感光層面側の塗布)
〔感光性ハロゲン化銀乳剤Aの調製〕
〈溶液A1〉
フェニルカルバモイル化ゼラチン 88.3g
化合物(A)(10%メタノール水溶液) 10ml
臭化カリウム 0.32g
水で5429mlに仕上げる
〈溶液B1〉
0.67mol/L硝酸銀水溶液 2635ml
〈溶液C1〉
臭化カリウム 51.55g
沃化カリウム 1.47g
水で660mlに仕上げる
〈溶液D1〉
臭化カリウム 154.9g
沃化カリウム 4.41g
塩化イリジウム(1%溶液) 0.93ml
水で1982mlに仕上げる
〈溶液E1〉
0.4mol/L臭化カリウム水溶液 下記銀電位制御量
〈溶液F1〉
水酸化カリウム 0.71g
水で20mlに仕上げる
〈溶液G1〉
56%酢酸水溶液 18.0ml
〈溶液H1〉
無水炭酸ナトリウム 1.72g
水で151mlに仕上げる
化合物(A):
HO(CH2CH2O)n−(CH(CH3)CH2O)17−(CH2CH2O)mH(m+n=5〜7)
特公昭58−58288号公報に示される混合攪拌機を用いて、溶液A1に溶液B1の1/4量および溶液C1の全量を温度45℃、pAg8.09に制御しながら、同時混合法により4分45秒を要して添加し、核形成を行った。1分後、溶液F1の全量を添加した。この間pAgの調整を溶液E1を用いて適宜行った。6分間経過後、溶液B1の3/4量および溶液D1の全量を、温度45℃、pAg8.09に制御しながら、同時混合法により14分15秒かけて添加した。5分間攪拌した後、40℃に降温し、溶液G1を全量添加し、ハロゲン化銀乳剤を沈降させた。沈降部分2000mlを残して上澄み液を取り除き、水を10リットル加え、攪拌後、再度ハロゲン化銀乳剤を沈降させた。沈降部分1500mlを残し、上澄み液を取り除き、更に水を10リットル加え、攪拌後、ハロゲン化銀乳剤を沈降させた。沈降部分1500mlを残し、上澄み液を取り除いた後、溶液H1を加え、60℃に昇温し、更に120分攪拌した。最後にpHが5.8になるように調整し、銀量1モル当たり1161gになるように水を添加し、感光性ハロゲン化銀乳剤Aを得た。
【0096】
この乳剤は、平均粒子サイズ0.058μm、粒子サイズの変動係数12%、〔100〕面比率92%の単分散立方体沃臭化銀粒子であった。
【0097】
〔粉末有機銀塩Aの調製〕
4720mlの純水にベヘン酸130.8g、アラキジン酸67.7g、ステアリン酸43.6g、パルミチン酸2.3gを80℃で溶解した。次に1.5モル/Lの水酸化ナトリウム水溶液540.2mlを添加し濃硝酸6.9mlを加えた後、55℃に冷却して脂肪酸ナトリウム溶液を得た。上記の脂肪酸ナトリウム溶液の温度を55℃に保ったまま、45.3gの上記の感光性ハロゲン化銀乳剤Aと純水450mlを添加し5分間攪拌した。
【0098】
次に1モル/Lの硝酸銀溶液702.6mlを2分間かけて添加し、10分間攪拌し有機銀塩分散物を得た。その後、得られた有機銀塩分散物を水洗容器に移し、脱イオン水を加えて攪拌後、静置させて有機銀塩分散物を浮上分離させ、下方の水溶性塩類を除去した。その後、排水の電導度が2μS/cmになるまで脱イオン水による水洗、排水を繰り返し、遠心脱水を実施した後、得られたケーキ状の有機銀塩を、気流式乾燥機フラッシュジェットドライヤー(株式会社セイシン企業製)を用いて、窒素ガス雰囲気および乾燥機入り口熱風温度の運転条件により、含水率が0.1%になるまで乾燥して有機銀塩の乾燥済み粉末有機銀塩Aを得た。なお、有機銀塩組成物の含水率測定には赤外線水分計を使用した。
【0099】
〔予備分散液Aの調製〕
ポリビニルブチラール粉末(Monsanto社製ButvarB−79)14.57gをMEK1457gに溶解し、VMA−GETZMANN社製ディゾルバDISPERMAT CA−40M型にて攪拌しながら粉末有機銀塩Aの500gを徐々に添加して十分に混合することにより予備分散液Aを調製した。
【0100】
〔感光性乳剤分散液1の調製〕
予備分散液Aを、ポンプを用いてミル内滞留時間が1.5分間となるように、0.5mm径のジルコニアビーズ(東レ(株)製トレセラム)を内容積の80%充填したメディア型分散機DISPERMAT SL−C12EX型(VMA−GETZMANN社製)に供給し、ミル周速8m/sにて分散を行なうことにより感光性乳剤分散液1を調製した。
【0101】
〔安定剤液の調製〕
1.0gの安定剤−1、0.31gの酢酸カリウムをメタノール4.97gに溶解し安定剤液を調製した。
【0102】
〔赤外増感色素液Aの調製〕
1.2mgの赤外増感色素1、1.488gの2−クロロ−安息香酸、2.779gの安定剤−2および365mgの5−メチル−2−メルカプトベンズイミダゾールを31.3mlのMEKに暗所にて溶解し赤外増感色素液Aを調製した。
【0103】
【化7】
【0104】
〔添加液aの調製〕
現像剤としての1,1−ビス(2−ヒドロキシ−3,5−ジメチルフェニル)−2−メチルプロパンを27.98gと1.54gの4−メチルフタル酸、0.48gの前記赤外染料−1をMEK110gに溶解し添加液aとした。
【0105】
〔添加液bの調製〕
3.56gのカブリ防止剤−2、3.43gのフタラジンをMEK40.9gに溶解し添加液bとした。
【0106】
【化8】
【0107】
〔感光層塗布液の調製〕
不活性気体雰囲気下(窒素97%)において、前記感光性乳剤分散液1(50g)およびMEK15.11gを攪拌しながら21℃に保温し、化学増感剤Sen−5(0.5%メタノール溶液)1000μlを加え、2分後にカブリ防止剤−1(10%メタノール溶液)390μlを加え、1時間攪拌した。さらに臭化カルシウム(10%メタノール溶液)494μlを添加して10分撹拌した後に上記の化学増感剤Sen−5の1/20モル相当の金増感剤Au−5を添加し、更に20分攪拌した。続いて、安定剤液の167mlを添加して10分間攪拌した後、1.32gの前記赤外増感色素液Aを添加して1時間攪拌した。その後、温度を13℃まで降温してさらに30分攪拌した。13℃に保温したまま、ポリビニルブチラール粉末(Monsanto社製ButvarB−79)13.31gを添加して30分攪拌した後、テトラクロロフタル酸(9.4質量%MEK溶液)1.084gを添加して15分間攪拌した。さらに攪拌を続けながら、12.43gの添加液a、1.6mlのDesmodurN3300/モーベイ社製の脂肪族イソシアネート(10%MEK溶液)、4.27gの添加液bを順次添加し攪拌することにより感光層塗布液を得た。
【0108】
【化9】
【0109】
〔マット剤分散液の調製〕
セルロースアセテートブチレート(Eastman Chemical社、7.5gのCAB171−15)をMEK42.5gに溶解し、その中に、炭酸カルシウム(Speciality Minerals社、Super−Pflex200)5gを添加し、ディゾルバ型ホモジナイザにて8000rpmで30分間分散しマット剤分散液を調製した。
【0110】
〔保護層塗布液の調製〕
MEK865gを攪拌しながら、セルロースアセテートブチレート(Eastman Chemical社、CAB171−15)を96g、ポリメチルメタクリル酸(ローム&ハース社、パラロイドA−21)を4.5g、ビニルスルホン化合物(1,3−ジビニルスルホニル−2−ヒドロキシプロパン)を1.5g、ベンズトリアゾールを1.0g、F系活性剤(旭硝子社、サーフロンKH40)を1.0g、添加し溶解した。次に上記マット剤分散液30gを添加して攪拌し、保護層塗布液を調製した。
【0111】
〔感光層面側塗布〕
前記感光層塗布液と保護層塗布液をエクストルージョン型押し出しコーターを用いて、前記作製した各プラスチックフィルムの下引層の上に、同時に重層塗布することにより感光材料を作製した。塗布は、感光層は塗布銀量1.9g/m2、表面保護層は乾燥膜厚で2.5μmになる様にして行った。その後、乾燥温度75℃、露点温度10℃の乾燥風を用いて、10分間乾燥を行い、熱現像用ハロゲン化銀写真感光材料No.1(比較試料)を作製した。
【0112】
(試料No.2〜26の熱現像用ハロゲン化銀写真感光材料の作製)
試料No.1の保護層塗布液に代えて、試料No.1の保護層塗布液の表3に記載の本発明に係るポリマーを表3に記載の量比で添加して試料No.2〜26の保護層塗布液を調製し、試料No.1の作製と同様にして、熱現像用ハロゲン化銀写真感光材料試料No.2〜26(本発明)を作製した。
【0113】
(試料No.27、28の熱現像用ハロゲン化銀写真感光材料の作製)
熱現像用ハロゲン化銀写真感光材料試料No.27、28はそれぞれ、A−06およびB−02を、保護層ではなく感光層塗布液に感光層のバインダーとポリマーの総量に対して20質量%になるように添加して作製した。
【0114】
《熱現像用ハロゲン化銀写真感光材料試料の評価》
以上のようにして作製した試料No.1〜28を、下記に示す評価を行った。
【0115】
〈汚れ〉:汚れは、直径12cmの熱ドラムの周辺に直径2.5cmのシリコーンゴム熱ローラー(熱源を有せず)を配置し、加重3kPaを掛けて150℃で現像するテスト用現像装置を用い、20×30cmサイズの試料を順次200枚づつ加熱現像処理したときの最後の190枚目から200枚目の各種試料の汚れを評価した。ここで、汚れがないレベルを5、極僅かに汚れが認められるレベルを4、わずかの汚れがあるレベルを3、汚れが多少認められるレベルを2、ひどい汚れがあるものを1とした。
【0116】
以上の結果を表3示す。
【0117】
【表3】
【0118】
表3から明らかなように、本発明の試料は熱現像による汚れの発生が少ないことが判る。
【0119】
【発明の効果】
本発明により熱現像による汚れの発生が少ない熱現像用ハロゲン化銀写真感光材料を提供することができた。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a silver halide photographic light-sensitive material for heat development containing organic silver having improved physical properties of a protective layer.
[0002]
[Prior art]
Silver halide photographic light-sensitive materials that have been widely used in the past have been used in the field of image formation as a broader and higher-quality material due to their superior photographic properties. However, development and fixing are required to form images. In addition, a process such as washing with water and drying is necessary, and further, since the treatment process is wet, there is a disadvantage that the work is complicated. For this reason, a silver halide photographic light-sensitive material for heat development, in which the development process is carried out by heat treatment, has been developed and put into practical use, and has recently been rapidly spread mainly in the medical industry.
[0003]
Such techniques include, for example, U.S. Pat. Nos. 3,152,904, 3,487,075, D.C. As described in “Dry Silver Photographic Materials” by Morgan (Handbook of Imaging Materials, Marcel Dekker, Inc. p. 48, 1991), etc. A silver salt photothermographic dry imaging material having a silver halide grain and a reducing agent is known. Since this silver salt photothermographic dry imaging material (synonymous with the silver halide photographic light-sensitive material for heat development) does not use any solution processing chemicals, a simpler system can be provided to the user.
[0004]
In general, a silver halide photographic light-sensitive material for heat development requires a step of heating uniformly to reduce the organic silver salt in the image portion of the photosensitive layer after imagewise exposure. There are hot air development and microwave development, but many are heated and developed in contact with a hot roller. At this time, the contact between the photosensitive surface and the heat roller should not be damaged, and the additive of the photosensitive layer will diffuse to the surface due to volatilization or melting, and this will not adhere to the heat roller and cause stains. It is important to do.
[0005]
For this reason, it is conceivable to prevent the adhesion by crosslinking the binder of the protective layer. As crosslinking techniques, U.S. Pat. Nos. 4,886,739, 4,942,115, 5,264,334, etc. Each specification discloses the use of a polyalkoxysilane compound. It is stated that these compounds are hydrolyzed by heat and the exposed hydroxy groups are combined with a binder to strengthen the crosslinking. However, when hydrolysis is performed with the above heat, alcohol and moisture are released, and these are diffused into the support, causing the support to curl and causing poor conveyance. As countermeasures, there were disadvantages such as the need for a diffusion preventing layer for moisture and alcohol.
[0006]
On the other hand, US Pat. Nos. 4,828,971 and 5,891,610 describe the use of polysilicate compounds. This compound is less hydrolyzable than polyalkoxysilane, but has disadvantages such as the film after drying tends to crack. Therefore, as a modification of the film surface of the heat developing material, US Pat. Nos. 3,489,567 and 3,885,965 disclose that a polysiloxane compound is added as a lubricant. . However, in these, although the slip of the film surface of the heat developing material is improved, the scratch resistance of the heat developing material and the contamination due to adhesion of the additive of the heat developing material to the heat roller are not studied at all. . U.S. Pat. No. 6,350,561 discloses a compound in which a barrier layer made of a film-forming acrylate or methacrylate polymer containing an epoxy group is applied to a heat developing material and diffuses to the surface during heat development. (For example, fatty acids such as behenic acid) are being reduced, but sufficient effects have not been obtained.
[0007]
[Problems to be solved by the invention]
Accordingly, an object of the present invention is to provide a silver halide photographic light-sensitive material for heat development in which the occurrence of contamination due to heat development is small.
[0008]
[Means for Solving the Problems]
The above object of the present invention has been achieved by the following constitutions.
[0009]
1) In a silver halide photographic light-sensitive material for heat development having a photographic composition layer comprising a photosensitive layer and a protective layer on a support, the protective layer comprises a polymer having an active methylene group.The ratio when the mass% after mixing with the polymer binder of the protective layer is 100 is in the range of 75-100.A silver halide photographic light-sensitive material for heat development, comprising: (First invention)
2) In a silver halide photographic light-sensitive material for heat development having a photographic constituent layer including a photosensitive layer and a protective layer on a support, the protective layer is a polymer having a maleic anhydride unit as a copolymerization component.The ratio when the mass% after mixing with the polymer binder of the protective layer is 100 is in the range of 75-100.A silver halide photographic light-sensitive material for heat development, comprising: (Second invention)
In the following description, the first invention and the second invention are collectively referred to as the present invention unless otherwise specified.
[0010]
The present invention will be described in more detail.
The structure of the polymer having an active methylene group in the first invention is particularly preferably the one represented by the following general formula [1].
[0011]
General formula [1]-(A1)x-(B1)y-(C1)z−
Where A1Represents a repeating unit derived from an ethylenically unsaturated monomer having an active methylene group represented by the following general formula [2]. B1Represents a repeating unit derived from an ethylenically unsaturated monomer selected from methacrylic acid ester, acrylic acid ester and maleic acid ester whose homopolymer has a glass transition temperature of 35 ° C. or lower. C1Represents a repeating unit derived from an ethylenically unsaturated monomer having a glass transition temperature of more than 35 ° C. Here, x, y, and z each represent a mass percentage ratio of each component in the polymer, and represent 0.5 ≦ x ≦ 45, 0 ≦ y ≦ 60, 20 ≦ z ≦ 95, and x + y + z = 100, respectively.
[0012]
[Chemical 1]
[0013]
Where R1Represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or a halogen atom, and L represents a single bond or a divalent linking group, specifically represented by the following formula.
[0014]
-(L1)m-(L2)n−
L1Is -CON (R2)-(R2Represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or a substituted alkyl group having 1 to 6 carbon atoms), -COO-, -NHCO-, -OCO-,
[0015]
[Chemical 2]
[0016]
Where R2Is synonymous with the above, RThreeAnd RFourEach independently represents hydrogen, hydroxyl, halogen atom, substituted or unsubstituted alkyl, alkoxy, acyloxy or aryloxy. L2Is L1Represents a linking group connecting X and X. m represents 0 or 1, and n represents 0 or 1.
[0017]
L2Specifically, the linking group represented by the formula is represented by the following general formula.
-[X1-(J1-X2)p-(J2-XThree)q-(JThree)r]s−
Where J1, J2And JThreeMay be the same or different, -CO-, -SO2-, -CON (RFive)-(RFiveIs a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, a substituted alkyl group having 1 to 6 carbon atoms), -SO2N (RFive)-(RFiveIs as defined above), -N (RFive-R6-(RFiveIs synonymous with the above, R6Is an alkylene group having 1 to 4 carbon atoms), -N (RFive-R6-N (R7)-(RFive, R6Is synonymous with the above, R7Represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or a substituted alkyl group having 1 to 6 carbon atoms. ), -O-, -S-, -N (RFive) -CO-N (R7)-(RFive, R7Is as defined above), -N (RFive-SO2N (R7)-(RFive, R7Is as defined above, -COO-, -OCO-, -N (RFiveCO2-(RFiveIs as defined above), -N (RFive) CO- (RFiveMay be the same as above.
[0018]
p, q, r and s each represents 0 or 1; X1, X2And XThreeMay be the same as or different from each other and each represents an unsubstituted or substituted alkylene group, aralkylene group, or phenylene group having 1 to 10 carbon atoms, and the alkylene group may be linear or branched. Examples of alkylene groups include methylene, methylmethylene, dimethylmethylene, dimethylene, trimethylene, tetramethylene, pentamethylene, hexamethylene, decylmethylene, aralkylene groups such as benzylidene, and phenylene groups such as p-phenylene, m-phenylene, and methyl. There is phenylene.
[0019]
X represents a monovalent group containing an active methylene group, and preferred specific examples include R8-CO-CH2-COO-, CN-CH2-COO-, R8-CO-CH2-CO-, R8-CO-CH2-CON (RFive)-And the like. Where RFiveIs the same as above and R8Is a substituted or unsubstituted alkyl group having 1 to 12 carbon atoms (for example, methyl, ethyl, n-propyl, n-butyl, t-butyl, n-nonyl, 2-methoxyethyl, 4-phenoxybutyl, benzyl, 2 -Methanesulfonamidoethyl etc.), substituted or unsubstituted aryl groups (eg phenyl, p-methylphenyl, p-methoxyphenyl, o-chlorophenyl etc.), alkoxy groups (eg methoxy, ethoxy, methoxyethoxy, n-butoxy) Etc.), cycloalkyloxy group (eg cyclohexyloxy), allyloxy (eg phenoxy, p-methylphenoxy, o-chlorophenoxy, p-cyanophenoxy etc.), amino group, substituted amino group (eg methylamino, ethylamino, dimethyl) Amino, butylamino and the like.
[0020]
In the polymer represented by the general formula [1], A1Although the ethylenically unsaturated monomer which has an active methylene group represented by these is illustrated, it is not limited to these.
[0021]
MN-1: 2-acetoacetoxyethyl methacrylate
MN-2: 2-acetoacetoxyethyl acrylate
MN-3: 2-acetoacetoxypropyl methacrylate
MN-4: 2-acetoacetoxypropyl acrylate
MN-5: 2-acetoacetamidoethyl methacrylate
MN-6: 2-acetoacetamidoethyl acrylate
MN-7: 2-cyanoacetoxyethyl methacrylate
MN-8: 2-cyanoacetoxyethyl acrylate
MN-9: N- (2-cyanoacetoxyethyl) acrylamide
MN-10: 2-propionyl acetoxyethyl acrylate
MN-11: N- (2-propionylacetoxyethyl) methacrylamide
MN-12: N-4- (acetoacetoxybenzyl) phenylacrylamide
MN-13: Ethylacryloyl acetate
MN-14: acryloyl methyl acetate
MN-15: N-methacryloyloxymethylacetoacetamide
MN-16: Ethylmethacryloyl acetoacetate
MN-17: N-allyl cyanoacetamide
MN-18: methylacryloyl acetoacetate
MN-19: N- (2-methacryloyloxyethyl) cyanoacetamide
MN-20: p- (2-acetoacetyl) ethylstyrene
MN-21: 4-acetoacetyl-1-methacryloylpiperazine
MN-22: ethyl-α-acetoacetoxy methacrylate
MN-23: N-butyl-N-acryloyloxyethylacetoacetamide
MN-24: p- (2-acetoacetoxy) ethylstyrene
B in the general formula [1]1An ethylenically unsaturated monomer that gives a repeating unit represented by the following formula is a monomer whose homopolymer has a glass transition temperature of 35 ° C. or lower, and specifically includes alkyl acrylates (for example, methyl acrylate, ethyl acrylate). , N-butyl acrylate, n-hexyl acrylate, benzyl acrylate, 2-ethylhexyl acrylate, iso-nonyl acrylate, n-dodecyl acrylate, etc., alkyl methacrylate (for example, n-butyl methacrylate, n-hexyl methacrylate, 2-ethylhexyl methacrylate) , Iso-nonyl methacrylate, n-dodecyl methacrylate, etc.) and dienes (for example, butadiene, isoprene, etc.).
[0022]
More preferable monomers are monomers having a glass transition temperature of 10 ° C. or less of homopolymers. Examples of such monomers include alkyl acrylates having an alkyl side chain having 2 or more carbon atoms (for example, ethyl acrylate, n-butyl acrylate, 2-ethylhexyl acrylate, iso-nonyl acrylate, etc.), alkyl methacrylates having an alkyl side chain of 6 or more carbon atoms (for example, n-hexyl methacrylate, 2-ethylhexyl methacrylate, etc.) and dienes (for example, butadiene, isoprene) are particularly preferred. As an example. Two or more of these monomers may be used in combination.
[0023]
Regarding the value of the glass transition temperature of the above-mentioned polymer, refer to Brandrup, E.I. H. Immergut, “Polymer Handbook”, 3rd edition (John Wily & Sons, 1989) VI / 209-VI / 277.
[0024]
C in the general formula [1]1Represents a repeating unit derived from a monomer having a glass transition temperature of more than 35 ° C.
[0025]
Specifically, acrylic acid esters (for example, t-butyl acrylate, phenyl acrylate, 2-naphthyl acrylate, etc.), methacrylic acid esters (for example, methyl methacrylate, ethyl methacrylate, 2-hydroxyethyl methacrylate, benzyl methacrylate, 2- Hydroxypropyl methacrylate, phenyl methacrylate, cyclohexyl methacrylate, cresyl methacrylate, 4-chlorobenzyl methacrylate, ethylene glycol dimethacrylate, etc.), vinyl esters (eg, vinyl benzoate, pivaloyloxyethylene, etc.), acrylamides ( For example, acrylamide, methyl acrylamide, ethyl acrylamide, propyl acrylamide, butyl acrylamide, tert-butyl acrylate. Acrylamide, cyclohexylacrylamide, benzylacrylamide, hydroxymethylacrylamide, methoxyethylacrylamide, dimethylaminoethylacrylamide, phenylacrylamide, dimethylacrylamide, diethylacrylamide, β-cyanoethylacrylamide, diacetoneacrylamide, etc.), methacrylamides (for example, methacrylamide, Methyl methacrylamide, ethyl methacrylamide, propyl methacrylamide, butyl methacrylamide, tert-butyl methacrylamide, cyclohexyl methacrylamide, benzyl methacrylamide, hydroxymethyl methacrylamide, methoxyethyl methacrylamide, dimethylaminoethyl methacrylamide, phenyl methacrylamide, Jime Til methacrylamide, diethyl methacrylamide, β-cyanoethyl methacrylamide, etc.), styrenes (eg, styrene, methyl styrene, dimethyl styrene, trimethylene styrene, ethyl styrene, isopropyl styrene, chlorostyrene, methoxy styrene, acetoxy styrene, chlorostyrene) , Dichlorostyrene, bromostyrene, vinyl benzoic acid methyl ester, etc.), divinylbenzene, acrylonitrile, methacrylonitrile, N-vinylpyrrolidone, N-vinyloxazolidone, vinylidene chloride, phenyl vinyl ketone and the like. Two or more of these monomers may be used in combination.
[0026]
The polymer represented by the general formula [1] is disclosed in JP-A-60-15935, 45-3822, 53-28086, US Pat. No. 3,700,456, etc. A monomer having an ionic functional group (for example, a carboxyl group or a sulfonic acid group) as described in 1) may be copolymerized. Examples of such monomers include the following compounds. Acrylic acid, methacrylic acid, itaconic acid, maleic acid, monoalkyl itaconate (eg, monomethyl itaconate, monoethyl itaconate, etc.), monoalkyl maleate (eg, monomethyl maleate, monoethyl maleate, etc.), citraconic acid, styrene Sulfonic acid, vinyl benzyl sulfonic acid, vinyl sulfonic acid, acryloyloxyalkyl sulfonic acid (for example, acryloyloxymethyl sulfonic acid, acryloyloxyethyl sulfonic acid, acryloyloxypropyl sulfonic acid, etc.), methacryloyloxyalkyl sulfonic acid (for example, methacryloyloxy) Methyl sulfonic acid, methacryloyloxyethyl sulfonic acid, methacryloyloxypropyl sulfonic acid, etc.), acrylamide alkyl sulfonic acid (for example, 2-acrylic acid) Luamido-2-methylethanesulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid, 2-acrylamido-2-methylbutanesulfonic acid, etc.), methacrylamide alkylsulfonic acid (for example, 2-methacrylamido-2-methylethane) Sulfonic acid, 2-methacrylamide-2-methylpropanesulfonic acid, 2-methacrylamide-2-methylbutanesulfonic acid, etc.). These acids may be alkali metal salts (for example, Na, K etc.) or ammonium salts. The preferred amount of these monomers is 0-20% by weight, particularly preferably 0-10% by weight, based on the total weight of the polymer.
[0027]
The structure of the polymer having a maleic anhydride unit as a copolymer component in the second invention is particularly preferably represented by the following general formula [3].
[0028]
[Chemical 3]
[0029]
Where M+Represents a hydrogen ion or a metal ion such as sodium, potassium or lithium, and RTenRepresents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or a substituted alkyl group having 1 to 6 carbon atoms. B2Is B in the general formula [1]1Is synonymous with C2Is C in the general formula [1]1It is synonymous with. x1, X2, Y1And z1Represents the mass percentage ratio of each component in the polymer, 0.5 ≦ x1≦ 50, 0 ≦ x2≦ 10, 0 ≦ y1≦ 60, 20 ≦ z1≦ 95, x1+ X2+ Y1+ Z1= 100.
[0030]
Moreover, the polymer represented by the general formula [3] of the present invention may be copolymerized with a monomer having an ionic functional group. Examples of such monomers include the following compounds. Acrylic acid, methacrylic acid, itaconic acid, monoalkyl itaconate (eg, monomethyl itaconate, monoethyl itaconate, etc.), monoalkyl maleate (eg, monomethyl maleate, monoethyl maleate, etc.), citraconic acid, styrene sulfonic acid, Vinyl benzyl sulfonic acid, vinyl sulfonic acid, acryloyloxyalkyl sulfonic acid (for example, acryloyloxymethyl sulfonic acid, acryloyloxyethyl sulfonic acid, acryloyloxypropyl sulfonic acid, etc.), methacryloyloxyalkyl sulfonic acid (for example, methacryloyloxymethyl sulfonic acid) Methacryloyloxyethyl sulfonic acid, methacryloyloxypropyl sulfonic acid, etc.), acrylamide alkyl sulfonic acid (for example, 2-acrylamide- -Methylethanesulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid, 2-acrylamido-2-methylbutanesulfonic acid, etc.), methacrylamide alkylsulfonic acid (for example, 2-methacrylamide-2-methylethanesulfonic acid, 2-methacrylamide-2-methylpropanesulfonic acid, 2-methacrylamide-2-methylbutanesulfonic acid, etc.). These acids may be alkali metal salts (for example, Na, K etc.) or ammonium salts. The preferred amount of these monomers is 0-20% by weight, particularly preferably 0-10% by weight, based on the total weight of the polymer.
[0031]
The polymer having an active methylene group used in the first invention preferably satisfies the composition represented by the general formula [1]. Moreover, it is preferable that the polymer which has maleic anhydride as a copolymerization component used for 2nd this invention satisfy | fills the composition represented by the said General formula [3].
[0032]
The polymer having an active methylene group used in the first invention has a significantly low glass transition temperature when y ≧ 60. The polymer having maleic anhydride as a copolymerization component used in the second invention is y1When ≧ 60, the glass transition temperature of the polymer is remarkably lowered. If such a polymer having a low glass transition temperature is present in the binder, the object of the present invention may not be sufficiently exhibited depending on the amount of the polymer added. In order to achieve the object of the present invention, the glass transition temperature of the polymer of the present invention is preferably −10 ° C. or higher, more preferably 20 ° C. or higher.
[0033]
The glass transition temperature of the polymer is, for example, J. Brandrup, E.I. H. Immergut, “Polymer Handbook, 2nd Edition, III-139 to III-192 (1975)”.
[0034]
The glass transition temperature (Tg) of the copolymer can be determined by the following equation.
1 / Tg = a1/ Tg1+ A2/ Tg2+ AThree/ TgThree+ ... an/ Tgn
Tgn; Tg of homopolymer of monomer n
an: Represents the mass fraction of monomer n in the polymer, a1+ A2+ AThree+ ... an= 1.
[0035]
These polymers can be obtained by various polymerization methods such as solution polymerization, suspension polymerization, and emulsion polymerization. Among these, solution polymerization is preferable because there is little mixing of a third component such as a surfactant. Solvents used in the solution polymerization method include, for example, ethyl acetate, methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, acetone, dioxane, N, N-dimethylformamide, N, N-dimethylacetamide, benzene, toluene In addition, various organic solvents such as acetonitrile, methylene chloride, chloroform, dichloroethane methyl ethyl ketone, or a mixture of two or more kinds thereof may be used, or a mixed solvent with water may be used.
[0036]
The polymerization temperature needs to be set in relation to the molecular weight of the polymer to be produced, the type of initiator, etc., and the polymerization is usually carried out in the range of 30 to 100 ° C.
[0037]
Examples of the radical initiator used in the polymerization include 2,2'-azobisisobutyronitrile, 2,2'-azobis (2,4-dimethylvaleronitrile), 2,2'-azobis (2-amidino). Propane) dihydrochloride, azo initiators such as 4,4'-azobis (4-cyanopentanoic acid), benzoyl peroxide, t-butyl hydroperoxide, potassium persulfate (for example, sodium bisulfite) And a peroxide-based initiator such as a redox initiator may be used in combination. In the present invention, an initiator (for example, 2,2'-azobis (2,4-dimethylvaleronitrile), 2,2'-azobis (4-methoxy-2,4) having a half-life of 10 hours or less is 70 ° C or less. -Dimethylvaleronitrile), dimethyl 2,2'-azobis (2-methylpropionate), 2,2'-azobis [2- (3,4,5,6-tetrahydropropane) dihydrochloride] and the like) Particularly preferred.
[0038]
The amount of the polymerization initiator used can be adjusted according to the polymerizability of the monomer and the required molecular weight of the polymer, but is preferably in the range of 0.01 to 5.0 mol% with respect to the monomer. In the synthesis of the polymer of the present invention, the monomers for forming A, B and C may be mixed and placed in a reaction vessel first, an initiator may be added, or these monomers may be dropped into a polymerization solvent. The polymerization may be carried out via
[0039]
The polymers having an active methylene group used in the first invention are exemplified in Table 1, and the polymers having a maleic anhydride unit used in the second invention as a copolymerization component are exemplified in Table 2. It is not limited to.
[0040]
[Table 1]
[0041]
[Table 2]
[0042]
[Formula 4]
[0043]
In the present invention, the protective layer is a layer provided on the opposite side of the support from the photosensitive layer. The thickness of the protective layer is not particularly limited, but is generally 0.5 to 10 μm, preferably 1 to 5 μm. In the first invention, the polymer having an active methylene group used in the first invention contained in the protective layer may be used alone or in combination with another polymer binder. . When used in combination with a polymer binder, the mixing ratio of the polymer having an active methylene group used in the first invention is preferably 10 to 100% by mass, more preferably 100% by mass after mixing. 20 to 100% by mass.
[0044]
In the second aspect of the present invention, the polymer having the maleic anhydride unit used in the second aspect of the present invention contained in the protective layer as a copolymerization component may be used alone, or other polymer binder and You may use together. When used in combination with a polymer binder, the mixing ratio of the polymer having a maleic anhydride unit used as the copolymerization component used in the second invention is 10 to 100% by mass, where 100% by mass after mixing. Preferably, it is 20-100 mass% more preferably.
[0045]
The structure of the silver halide photographic material for heat development will be described below.
The silver halide photographic light-sensitive material for heat development of the present invention is usually composed of at least one photosensitive layer on a support and at least two layers provided with a protective layer on the upper layer adjacent to the photosensitive layer. On the opposite side of the layer, a back coat layer (BC layer) or the like is appropriately provided as necessary. The photosensitive layer of the silver halide photographic material for heat development contains photosensitive silver halide grains that may be sensitized with a spectral sensitizing dye, and the photosensitive layer or its adjacent layer contains a silver source. An organic silver salt, and a reducing agent for developing a silver salt to form a silver image are contained. The photosensitive layer of the silver halide photographic light-sensitive material for heat development and the adjacent layer thereof contain a polymer binder, a hydrophilic binder, a hydrophobic binder, or latex that provides a heat development field. In the above-described silver halide photographic light-sensitive material for heat development, an anti-irradiation layer (AI layer) or a BC layer containing a dye for preventing irradiation or preventing halation is provided as necessary. The photosensitive layer of the above-described silver halide photographic light-sensitive material for heat development can contain a color tone agent for adjusting the color tone of the silver image, if necessary.
[0046]
As a polymer binder used in a photographic composition layer such as a photosensitive layer of the heat-developable material of the present invention, a material preferable as a place where a silver halide, an organic silver salt and a reducing agent react, a thermodecolorable dye is 80 to A material that is preferable for a reaction that is decolorized by heat of 200 ° C. or less, or a material that allows the base-generating precursor compound to rapidly generate a base by heat is selected. Examples of the polymer binder include alcohols such as methanol and ethanol, ketones such as methyl ethyl ketone and acetone, polymers used by dissolving in polar solvents including dimethyl sulfoxide and dimethylformamide, and water-dispersed polymers. The polymer binder for the heat-developable material of the present invention is preferably an aqueous dispersion polymer. Further, the glass transition point is preferably −20 ° C. to 100 ° C., more preferably −5 ° C. to 80 ° C., for the preferred polymer composition. This is because when the glass transition point is high, the temperature at which heat development is performed becomes high, and when the glass transition point is low, fogging is likely to occur and sensitivity is lowered or softened.
[0047]
Examples of the polymer used by dissolving in the above polar solvent include cellulose derivatives such as hydroxyethyl cellulose, carboxymethyl cellulose, methyl cellulose, ethyl cellulose, starch and derivatives thereof, polyvinyl alcohol, modified polyvinyl alcohol, polyvinyl butyral, sodium polyacrylate, poly Ethylene oxide, acrylic acid amide-acrylic acid ester copolymer, styrene-maleic anhydride copolymer, polyacrylamide, sodium alginate, gelatin, casein, polystyrene, polyvinyl acetate, polyurethane, polyacrylic acid, polyacrylic acid ester, styrene -Butadiene copolymer, acrylonitrile-butadiene copolymer, vinyl chloride-vinyl acetate copolymer, styrene-butadiene-a Such as Lil copolymer. Further, after drying, a film is formed, and then the coating film having a low equilibrium water content is preferable. Examples of particularly low water content include poly ((methacrylic acid) such as cellulose acetate, cellulose acetate butyrate, and poly (methyl methacrylic acid). Acrylic esters), poly (acrylic acid), poly (methacrylic acid), poly (vinyl chloride), copoly (styrene-maleic anhydride), copoly (styrene-acrylonitrile), copoly (styrene-butadiene), poly (vinyl) Acetals) (eg, poly (vinyl formal) and poly (vinyl butyral)), poly (esters), poly (urethanes), phenoxy resins, poly (vinylidene chloride), poly (epoxides), poly (carbonates) , Poly (vinyl acetate), cellulose esters, poly (a De) s can be mentioned. Polyvinyl butyral is obtained by acetalizing polyvinyl alcohol with butyraldehyde, and preferably has 50 to 90% by mass as a vinyl butyral unit. The degree of polymerization is preferably 500 to 5000.
[0048]
Further, the water-dispersed polymer is preferably a fine particle having an average particle diameter in the range of 1 nm to several μm and dispersed in an aqueous dispersion medium. Water-dispersed polymers are widely used as binders for water-based coatings. Among them, latex is particularly preferable because water resistance can be improved. The amount of latex used for obtaining water resistance as a binder is determined in consideration of applicability, but it is preferably as much as possible from the viewpoint of moisture resistance, and is usually 50 to 100% by mass and 80 to 100% by mass with respect to the total binder. % Is preferred.
[0049]
In the present invention, the organic silver salt is a reducible silver source, and is a silver salt of an organic acid or a heteroorganic acid, particularly a long-chain (10 to 30 carbon atoms, preferably 15 to 25) aliphatic carboxylic acid and A silver salt of a nitrogen-containing heterocyclic compound is preferred. Organic or inorganic complexes described in Research Disclosure (hereinafter simply referred to as RD) Nos. 17029 and 29963 in which the ligand has a value of 4.0 to 10.0 as a total stability constant with respect to silver ions Is also preferable. Examples of these suitable silver salts include the following.
[0050]
Silver salts of organic acids, for example, silver salts of gallic acid, succinic acid, behenic acid, stearic acid, arachidic acid, palmitic acid, lauric acid and the like. Silver carboxyalkylthiourea salts, for example, silver salts such as 1- (3-carboxypropyl) thiourea, 1- (3-carboxypropyl) -3,3-dimethylthiourea, aldehydes and hydroxy-substituted aromatic carboxylic acids Silver salts or complexes of polymer reaction products, for example, silver salts of reaction products of aldehydes (formaldehyde, acetaldehyde, butyraldehyde, etc.) and hydroxy-substituted acids (eg, salicylic acid, benzoic acid, 3,5-dihydroxybenzoic acid) Thru complexes, silver salts or complexes of thiones, such as 3- (2-carboxyethyl) -4-hydroxymethyl-4-thiazoline-2-thione and 3-carboxymethyl-4-thiazoline-2-thione Silver salts or complexes, imidazole, pyrazole, urazole, 1,2,4-thiazole and A complex or salt of nitrogen acid and silver selected from 1H-tetrazole, 3-amino-5-benzylthio-1,2,4-triazole and benztriazole, silver salts such as saccharin, 5-chlorosalicylaldoxime, and Silver salt of mercaptides. Among these, preferable silver salts include silver behenate, silver arachidate, and silver stearate.
[0051]
Photosensitive silver halide grains that can be used in the present invention will be described. The photosensitive silver halide grain in the present invention is a property inherent in silver halide crystals, or can absorb visible light or infrared light by an artificial or physicochemical method. And silver halide crystal grains produced by treatment so that physicochemical changes can occur in the silver halide crystal and / or on the crystal surface when absorbing visible or infrared light.
[0052]
The silver halide grains themselves used in the present invention are P.I. Chifie et Physique Photographic (published by PaulMontel, 1967) by Glafkides. F. Duffin's Photographic Emission Chemistry (published by The Focal Press, 1966), V.C. L. It can be prepared as a silver halide grain emulsion using the method described in Making and Coating Photographic Emulsion (published by The Focal Press, 1964) by Zelikman et al. That is, any of an acidic method, a neutral method, an ammonia method, etc. may be used, and the formation of reacting a soluble silver salt and a soluble halogen salt may be any one of a one-side mixing method, a simultaneous mixing method, and a combination thereof. Of these methods, the so-called controlled double jet method of preparing silver halide grains while controlling the formation conditions is preferable. The halogen composition is not particularly limited, and may be any of silver chloride, silver chlorobromide, silver chloroiodobromide, silver bromide, silver iodobromide, and silver iodide.
[0053]
The silver halide that can be used in the present invention preferably has a smaller average grain size in order to keep the white turbidity after image formation low and obtain good image quality, and the average grain size is preferably 0.2 μm or less. Is preferably 0.01 μm to 0.17 μm, particularly preferably 0.02 μm to 0.14 μm. The grain size here refers to the length of the edge of the silver halide grain when the silver halide grain is a so-called normal crystal of a cube or octahedron. Further, when the silver halide grain is a tabular grain, it means a diameter when converted into a circular image having the same area as the projected area of the main surface.
[0054]
Examples of the shape of the silver halide grains include cubes, octahedrons, tetrahedron grains, tabular grains, spherical grains, rod-like grains, and potato grains. Among these, in particular, cubes, octahedrons, 14 Planar and tabular silver halide grains are preferred.
[0055]
When tabular silver halide grains are used, the average aspect ratio is preferably 1.5 or more and 100 or less, more preferably 2 or more and 50 or less. These are described in U.S. Pat. Nos. 5,264,337, 5,314,798, 5,320,958, etc., and the desired tabular grains can be easily obtained. Can do. Further, grains having rounded corners of silver halide grains can be preferably used.
[0056]
Examples of the reducing agent suitable for incorporation in the silver halide photographic light-sensitive material for heat development of the present invention are U.S. Pat. Nos. 3,770,448, 3,773,512, and 3,593,863. In the specification of each No. and RD Nos. 17029 and 29963, it can be appropriately selected from known reducing agents, but an aliphatic carboxylic acid silver salt is used as the organic silver salt. In some cases, polyphenols in which two or more phenol groups are linked by an alkylene group or sulfur, particularly an alkyl group (for example, a methyl group, an ethyl group, a propyl group) at least one position adjacent to the hydroxy substitution position of the phenol group. , T-butyl group, cyclohexyl group, etc.) or an acyl group (for example, acetyl group, propionyl group, etc.) and two or more of the phenol groups substituted are alkylene groups. Bisphenols linked by sulfur is preferred.
[0057]
As described above, reducing agents having protons, such as bisphenols and sulfonamidophenols, are mainly used as reducing agents, so that active species capable of extracting these hydrogens are generated. It is preferable that a compound capable of inactivating the reducing agent is contained. Preferably, the colorless photo-oxidizing substance is preferably a compound capable of generating free radicals as reactive active species during exposure.
[0058]
Accordingly, any compound having these functions may be used, but an organic free radical composed of a plurality of atoms is preferred. A compound having any structure may be used as long as it has such a function and does not cause any particular adverse effect on the silver halide photographic material for heat development.
[0059]
In addition, as a compound that generates these free radicals, the generated free radicals are carbocyclic or heterocyclic in order to have such a stability that they can be in contact with the reducing agent for a sufficient period of time to react with and inactivate. Those having the following aromatic group are preferred.
[0060]
The silver halide grains used in the present invention can be chemically sensitized. For example, by the method disclosed in Japanese Patent Application Nos. 2000-57004 and 2000-61942, a compound that releases chalcogen such as sulfur or a noble metal compound that releases noble metal ions such as gold ions is used as a chemical sensitization center. (Chemically sensitized nuclei) can be formed and imparted. In the present invention, it is preferably chemically sensitized with an organic sensitizer containing a chalcogen atom. These chalcogen atom-containing organic sensitizers are preferably compounds having groups capable of adsorbing to silver halide and unstable chalcogen atom sites.
[0061]
As these organic sensitizers, organic sensitizers having various structures disclosed in JP-A-60-150046, JP-A-4-109240, JP-A-11-218874 and the like are used. Can do. Among these, it is preferable that the chalcogen atom is at least one compound having a structure in which a carbon atom or a phosphorus atom is bonded by a double bond.
[0062]
In addition to the above sensitization methods, reduction sensitization methods and the like can also be used. Specific compounds for reduction sensitization include ascorbic acid, thiourea dioxide, stannous chloride, hydrazine derivatives, borane compounds, Silane compounds, polyamine compounds, and the like can be used. Further, reduction sensitization can be performed by ripening the emulsion while maintaining the pH at 7 or higher or the pAg at 8.3 or lower.
[0063]
The photosensitive silver halide grains that can be used in the present invention are preferably subjected to spectral sensitization by adsorbing a spectral sensitizing dye. As spectral sensitizing dyes, cyanine dyes, merocyanine dyes, complex cyanine dyes, complex merocyanine dyes, holopolar cyanine dyes, styryl dyes, hemicyanine dyes, oxonol dyes, hemioxonol dyes and the like can be used. For example, JP-A-63-159841, JP-A-60-140335, JP-A-63-231437, JP-A-63-259651, JP-A-63-304242, JP-A-63-15245, U.S. Pat. No. 4,639,414. No. 4,740,455, No. 4,741,966, No. 4,751,175, No. 4,835,096 are used. it can. Useful sensitizing dyes used in the present invention are described or cited in, for example, RD No. 17643 IV-A (December, 1978, p.23) and No. 18431, X (August, 1978, p.437). It is described in the literature. In particular, it is preferable to use a sensitizing dye having spectral sensitivity suitable for the spectral characteristics of various laser imagers and scanner light sources. For example, JP-A-9-34078, JP-A-9-54409, JP-A-9-80679. The compounds described in each publication are preferably used.
[0064]
The emulsion containing the silver halide grains or organic silver salt grains used in the silver halide photographic light-sensitive material for heat development of the present invention is a dye having no spectral sensitizing action or visible light itself together with a sensitizing dye. In the emulsion, a substance that does not substantially absorb the color and expresses a supersensitization effect may be contained in the emulsion, whereby the silver halide grains may be supersensitized. Useful sensitizing dyes, combinations of dyes exhibiting supersensitization, and substances exhibiting supersensitization are described in RD 17643 (issued in December, 1978), page 23, section J of IV, or Japanese Patent Publication No. 9-25500. JP-A-43-4933, JP-A-59-19032, JP-A-59-192242, JP-A-5-341432 and the like can be used. In the present invention, in addition to the supersensitizer described above, a compound represented by the general formula (1) and a macrocyclic compound disclosed in Japanese Patent Application No. 2000-70296 are used as the supersensitizer. it can.
[0065]
In the present invention, a silver saving agent can be used. The silver saving agent as used herein refers to a compound that can reduce the amount of silver necessary to obtain a certain silver image density. Various action mechanisms of the function of decreasing can be considered, but a compound having a function of improving the covering power of developed silver is preferable. Here, the covering power of developed silver refers to the optical density per unit amount of silver. Preferred examples of the silver saving agent include hydrazine derivative compounds, vinyl compounds, and quaternary onium compounds.
[0066]
In the present invention, a cross-linking agent may be used not only for film attachment and development unevenness but also for the effect of suppressing fogging during storage and suppressing the generation of printout silver after development. As the crosslinking agent used in the present invention, various crosslinking agents conventionally used for photographic light-sensitive materials, such as aldehyde-based, epoxy-based, ethyleneimine-based, isocyanate-based, vinylsulfone-based, sulfonate-based, and acryloyl. Cross-linking agents such as those based on carbodiimides, silanes, and acid anhydrides can be used, but preferred are isocyanate compounds, silane compounds, epoxy compounds, and acid anhydrides.
[0067]
Examples of suitable toning agents for use in the present invention are RD 17029, U.S. Pat. Nos. 4,123,282, 3,994,732, 3,846,136 and 4, It is disclosed in each specification of No. 021,249. For example, imides (for example, succinimide, phthalimide, naphthalimide, N-hydroxy-1,8-naphthalimide), mercaptans (for example, 3-mercapto-1,2,4-triazole), phthalazinone derivatives or derivatives thereof Metal salts (for example, phthalazinone, 4- (1-naphthyl) phthalazinone, 6-chlorophthalazinone, 5,7-dimethyloxyphthalazinone, 2,3-dihydro-1,4-phthalazinedione), phthalazine and Combinations of phthalic acids (eg, phthalic acid, 4-methylphthalic acid, 4-nitrophthalic acid and tetrachlorophthalic acid), phthalazine and maleic anhydride, and phthalic acid, 2,3-naphthalenedicarboxylic acid or o-phenylene acid derivatives And anhydrides thereof (eg, phthalic acid, 4-methylphenol) Le acids, a combination of at least one compound selected from 4-nitrophthalic acid and tetrachlorophthalic anhydride) and the like. A particularly preferred colorant is a combination of phthalazinone or phthalazine with phthalic acids and phthalic anhydrides.
[0068]
In the present invention, it is preferable to contain a matting agent in the protective layer for handling before development and prevention of image damage after heat development, and 0.1 to 30% by mass with respect to the polymer according to the present invention. It is preferable to do. The material of the matting agent used in the present invention may be either organic or inorganic. Examples of inorganic substances include silica described in Swiss Patent No. 330,158 and the like, glass powder described in French Patent No. 1,296,995, and British Patent No. 1,173,181. Alkaline earth metals or carbonates such as cadmium and zinc described in the book can be used as the matting agent. Examples of organic substances include starch described in US Pat. No. 2,322,037 and the like, starch derivatives described in Belgian Patent 625,451 and British Patent 981,198, and the like. No. 44-3643, etc., polyvinyl alcohol described in Swiss Patent No. 330,158, etc., polymethacrylate described in US Pat. No. 3,079,257, etc., polyacrylonitrile described in US Pat. An organic matting agent such as polycarbonate described in Japanese Patent No. 3,022,169 can be used.
[0069]
In the present invention, a conductive compound such as a metal oxide and / or a conductive polymer can be included in the constituent layer in order to improve the chargeability. These may be contained in any layer, but are preferably contained in the undercoat layer, the backing layer, the layer between the photosensitive layer and the undercoat layer, and the like. In the present invention, the conductive compounds described in US Pat. No. 5,244,773, columns 14 to 20 are preferably used.
[0070]
In the silver halide photographic light-sensitive material for heat development of the present invention, a filter layer is formed on the same side as or opposite to the photosensitive layer in order to control the amount of light transmitted through the photosensitive layer or the wavelength distribution, or the photosensitive layer It is preferable to contain a dye or a pigment.
[0071]
Examples of the support used in the silver halide photographic light-sensitive material for heat development of the present invention include plastic films such as polyethylene terephthalate, polycarbonate, polyethylene, polyvinyl acetal, cellulose ester, cellulose triacetate, nitrocellulose, and polyethylene naphthalate, glass A metal plate such as paper or an aluminum plate is used.
[0072]
In the present invention, known compounds that absorb light in various wavelength regions can be used according to the color sensitivity of the photosensitive material. For example, when the silver halide photographic light-sensitive material for heat development of the present invention is used as an image recording material by infrared light, a squarylium dye (thiothiol having a thiopyrylium nucleus as disclosed in JP-A-2000-83655 is disclosed. It is preferred to use pyrylium squarylium dyes) and squarylium dyes having pyrylium nuclei (pyrylium squarylium dyes), thiopyrylium croconium dyes similar to squarylium dyes, or pyrylium croconium dyes.
[0073]
The silver halide photographic light-sensitive material for heat development of the present invention is a coating solution prepared by dissolving or dispersing the above-described constituent layers in a solvent, and applying a plurality of coating solutions simultaneously, followed by a drying process. Preferably it is formed. Here, "multiple simultaneous multi-layer coating" means that a coating solution for each constituent layer (for example, a photosensitive layer and a protective layer) is prepared, and when coating this onto a support, each layer is individually coated and dried repeatedly. In other words, it means that each constituent layer can be formed in such a state that simultaneous multilayer coating and drying can be performed. That is, the upper layer is provided before the remaining amount of the total solvent in the lower layer reaches 70% by mass or less. There are no particular restrictions on the method of applying multiple layers of each constituent layer simultaneously, and for example, a known method such as a bar coater method, curtain coating method, dipping method, air knife method, hopper coating method, or extrusion coating method may be used. Can do. Of these, a pre-weighing type coating method called an extrusion coating method is more preferable. Since the extrusion coating method does not volatilize on the slide surface unlike the slide coating method, it is suitable for precision coating and organic solvent coating. Although this coating method has been described on the side having the photosensitive layer, the same applies to the case of coating with undercoating when providing the backcoat layer.
[0074]
In the present invention, the development conditions vary depending on the equipment, apparatus, or means to be used, but the information is fixed by heat-developing the imagewise exposed silver halide photographic material for heat development. It is. The latent image obtained after the exposure is heated at a moderately high temperature (for example, about 80 to 200 ° C., preferably about 100 to 200 ° C.) for a sufficient time (generally about 1 second to about 2 minutes). The silver halide photographic material can be developed by heating. If the heating temperature is less than 80 ° C., sufficient image density cannot be obtained in a short time. If the heating temperature exceeds 200 ° C., the binder melts, and not only the image itself, such as transfer to a roller, but also to the transportability, developing machine, etc. Also has an adverse effect. By heating, a silver image is generated by an oxidation-reduction reaction between an organic silver salt (which functions as an oxidizing agent) and a reducing agent. This reaction process proceeds without any supply of treatment liquid such as water from the outside.
[0075]
In the exposure of the silver halide photographic light-sensitive material for heat development of the present invention, it is desirable to use a light source suitable for color sensitivity. For example, if it can be felt by infrared light, it can be applied to any light source as long as it is in the infrared light range. However, the laser power is high, or a silver halide photographic material for heat development is used. An infrared semiconductor laser (780 nm, 820 nm) is more preferably used because it can be made transparent.
[0076]
In the present invention, the exposure is preferably performed by laser scanning exposure, but various methods can be adopted as the exposure method. For example, as a first preferred method, there is a method using a laser scanning exposure machine in which the angle formed between the exposure surface of the silver halide photographic material for heat development and the scanning laser beam is not substantially perpendicular.
[0077]
Here, “substantially not perpendicular” means that the angle that is closest to the vertical during laser scanning is preferably 55 ° to 88 °, more preferably 60 ° to 86 °, and even more preferably 65 °. It is at least 84 degrees and most preferably 70 degrees to 82 degrees.
[0078]
As a second method, it is also preferable to perform exposure using a laser scanning exposure machine that emits scanning laser light that is a vertical multi. Compared with a single longitudinal mode scanning laser beam, image quality degradation such as occurrence of interference fringe-like unevenness is reduced.
[0079]
Furthermore, as a third aspect, it is also preferable to form an image by scanning exposure using two or more lasers. As such an image recording method using a plurality of lasers, it is used in an image writing unit of a laser printer or a digital copying machine which writes an image line by line in one scan in response to a demand for high resolution and high speed. This technique is known, for example, from Japanese Patent Laid-Open No. 60-166916. This is a method in which laser light emitted from a light source unit is deflected and scanned by a polygon mirror and imaged on a photoconductor via an fθ lens or the like. This is a laser scanning optical device that is theoretically the same as a laser imager or the like. It is. In each of the image recording methods described above, as a laser used for scanning exposure, generally well-known solid lasers such as a ruby laser, a YAG laser, and a glass laser, a He—Ne laser, an Ar ion laser, and a Kr ion laser are used. , CO2Laser, CO laser, He-Cd laser, N2Gas laser such as laser, excimer laser, InGaP laser, AlGaAs laser, GaAsP laser, InGaAs laser, InAsP laser, CdSnP2A laser, a semiconductor laser such as a GaSb laser, a chemical laser, a dye laser, or the like can be selected and used in a timely manner according to the application. Among these, it is preferable to use a semiconductor laser having a wavelength of 600 to 1200 nm from the viewpoint of maintenance and the size of the light source. In a laser used in a laser imager or a laser image setter, the beam spot diameter on the exposure surface when scanning a silver halide photographic material for heat development is generally 5 to 75 μm as the minor axis diameter, and the major axis diameter. The laser beam scanning speed is an optimum value for each heat-developable silver halide photographic material depending on the sensitivity and laser power at the laser oscillation wavelength inherent in the heat-developable silver halide photographic material. Can be set to
[0080]
【Example】
The present invention will be described more specifically with reference to the following examples. However, the present invention is not limited to the following examples.
[0081]
Example
(Preparation of sample No. 1 silver halide photographic material for heat development)
[Preparation of underdrawn support]
10 W / m on both sides of a biaxially stretched polyethylene terephthalate film with a thickness of 175 μm and a blue density of 0.1752-Corona discharge treatment was performed under the condition of min, and the following <Backcoat surface side undercoat coating solution> was applied on one surface to a dry film thickness of 0.06 μm, and then 140 ° C. (dew point temperature: 12 ° C.) for about 10 seconds, followed by coating the following << back coat surface side undercoat upper layer coating liquid >> so as to have a dry film thickness of 0.2 μm, followed by drying in the same manner. .
[0082]
On the other side, the following << image forming surface side undercoat lower layer coating solution >> is applied so as to have a dry film thickness of 0.2 μm, and then dried in the same manner, followed by the following << image forming surface side The undercoat upper layer coating solution was applied to a dry film thickness of 0.05 μm, and then dried at 140 ° C. These were heat-treated at 125 ° C. for 2 minutes to prepare an underdrawn support.
[0083]
《Backcoat surface side undercoat layer coating solution》
Styrene / Glycidyl methacrylate / Butyl acrylate
(20/20/40; mass ratio) copolymer (solid content 30%) 15.0 g
Styrene / butyl acrylate / hydroxymethyl methacrylate
(25/45/30; mass ratio) copolymer (solid content 30%) 4.0 g
SnO2Sol (91% solids) 91g
(Synthesis by the method described in JP-A-10-59720)
Surfactant (A) 0.5g
Distilled water was added to make 1000 ml, and a coating solution was obtained.
[0084]
<Backcoat surface side undercoat upper layer coating solution>
Modified aqueous polyester (solid content 18%) 215.0 g
Surfactant (A) 0.4g
True spherical silica matting agent Seahoster KE-P50 (made by Nippon Shokubai Co., Ltd.) 0.3g
Distilled water was added to make 1000 ml, and a coating solution was obtained.
[0085]
<Preparation of modified aqueous polyester>
In a reaction vessel for polycondensation, 35.4 parts by mass of dimethyl terephthalate, 33.63 parts by mass of dimethyl isophthalate, 17.92 parts by mass of 5-sulfo-isophthalic acid dimethyl sodium salt, 62 parts by mass of ethylene glycol, calcium acetate monohydrate 0.065 parts by mass of salt and 0.022 parts by mass of manganese acetate tetrahydrate were added, and the ester exchange reaction was performed while distilling off methanol at 170 to 220 ° C. in a nitrogen stream. 04 parts by mass, 0.04 parts by mass of antimony trioxide as a polycondensation catalyst and 6.8 parts by mass of 1,4-cyclohexanedicarboxylic acid were added, and a theoretical amount of water was distilled off at a reaction temperature of 220 to 235 ° C. Esterification was performed. Thereafter, the reaction system was further depressurized and heated for about 1 hour and finally subjected to polycondensation at 280 ° C. and 133 Pa or less for about 1 hour to obtain a modified aqueous polyester precursor. The intrinsic viscosity of the precursor was 0.33.
[0086]
850 ml of pure water was put into a 2 L three-necked flask equipped with a stirring blade, a reflux condenser, and a thermometer, and 150 g of the precursor was gradually added while rotating the stirring blade. After stirring for 30 minutes at room temperature, the mixture was heated to an internal temperature of 98 ° C. over 1.5 hours, and heated and dissolved at this temperature for 3 hours. After completion of the heating, the mixture was cooled to room temperature over 1 hour and left overnight to prepare a solution having a solid content concentration of 15% by mass.
[0087]
1900 ml of the precursor solution was placed in a 3 L four-necked flask equipped with a stirring blade, a reflux condenser, a thermometer, and a dropping funnel, and the internal temperature was heated to 80 ° C. while rotating the stirring blade. Into this, 6.52 ml of a 24% aqueous solution of ammonium peroxide was added, and a monomer mixture (28.5 g of glycidyl methacrylate, 21.4 g of ethyl acrylate, 21.4 g of methyl methacrylate) was dropped over 30 minutes. The reaction was continued for another 3 hours. Then, it cooled to 30 degrees C or less, and filtered, and prepared the solution of the modified aqueous polyester whose solid content concentration is 18 mass%.
[0088]
<< Coating liquid for underlayer on the image forming side >>
Styrene / butyl acrylate / hydroxymethyl methacrylate
(25/45/30; mass ratio) copolymer (solid content 30%) 70 g
Unitox D-110 (Acre Peterlite, USA) 5.0g
Surfactant (A) 0.3g
Distilled water was added to make 1000 ml, and a coating solution was obtained.
[0089]
<Image forming surface side undercoat upper layer coating solution>
75.0 g of 5% solid solution of EXEVAL RS-2117 (Kuraray)
Styrene / butyl acrylate / hydroxymethyl methacrylate
(25/45/30; mass ratio) copolymer (solid content 30%) 3.0 g
Surfactant (A) 0.2g
True spherical silica matting agent Seahoster KE-P50 (made by Nippon Shokubai Co., Ltd.) 0.3g
Distilled water was added to make 1000 ml, and a coating solution was obtained.
[0090]
[Chemical formula 5]
[0091]
<< Preparation of silver halide photographic material for heat development >>
Each of the photographic constituent layers prepared by the method described below was sequentially applied using the prepared undercoated support.
[0092]
(Application on the back side)
While stirring 830 g of methyl ethyl ketone (MEK), 84.2 g of cellulose acetate butyrate (Eastman Chemical, CAB381-20) and 4.5 g of a polyester resin (Bostic, VitelPE2200B) were added and dissolved. Next, 0.30 g of infrared dye-1 was added to the dissolved solution, and 4.5 g of F-type active agent (Asahi Glass Co., Surflon KH40) dissolved in 43.2 g of methanol and F-type active agent (Dainippon) Ink, MegaFag F120K) 2.3 g was added and stirred well until dissolved. Finally, 75 g of silica (WR Grace, Syloid 64X6000) dispersed in MEK at a concentration of 1% by mass with a dissolver type homogenizer was added and stirred to prepare a coating solution on the back surface side.
[0093]
[Chemical 6]
[0094]
The back surface coating solution prepared in this manner was applied and dried on an undercoat layer of each of the produced plastic films by an extrusion coater so that the dry film thickness was 3.5 μm. It dried for 5 minutes using the drying air with a drying temperature of 100 degreeC, and dew point temperature of 10 degreeC.
[0095]
(Coating on the photosensitive layer side)
[Preparation of photosensitive silver halide emulsion A]
<Solution A1>
Phenylcarbamoylated gelatin 88.3g
Compound (A) (10% methanol aqueous solution) 10 ml
Potassium bromide 0.32g
Finish to 5429 ml with water
<Solution B1>
0.67 mol / L silver nitrate aqueous solution 2635 ml
<Solution C1>
Potassium bromide 51.55g
Potassium iodide 1.47g
Finish to 660ml with water
<Solution D1>
Potassium bromide 154.9g
4.41 g of potassium iodide
Iridium chloride (1% solution) 0.93ml
Finish to 1982ml with water
<Solution E1>
0.4 mol / L potassium bromide aqueous solution The following silver potential control amount
<Solution F1>
Potassium hydroxide 0.71g
Finish to 20ml with water
<Solution G1>
56% acetic acid aqueous solution 18.0 ml
<Solution H1>
Anhydrous sodium carbonate 1.72 g
Finish to 151ml with water
Compound (A):
HO (CH2CH2O)n-(CH (CHThree) CH2O)17-(CH2CH2O)mH (m + n = 5-7)
Using a mixing stirrer disclosed in Japanese Patent Publication No. 58-58288, while controlling 1/4 of the solution B1 in the solution A1 and the total amount of the solution C1 to 45 ° C. and pAg of 8.09, 4 minutes by the simultaneous mixing method. Nucleation was performed by adding 45 seconds. After 1 minute, the entire amount of solution F1 was added. During this time, the pAg was appropriately adjusted using the solution E1. After 6 minutes, 3/4 amount of the solution B1 and the whole amount of the solution D1 were added over 14 minutes and 15 seconds by the simultaneous mixing method while controlling the temperature at 45 ° C. and pAg 8.09. After stirring for 5 minutes, the temperature was lowered to 40 ° C., the whole amount of the solution G1 was added, and the silver halide emulsion was precipitated. The supernatant was removed leaving 2000 ml of the sediment, 10 liters of water was added, and after stirring, the silver halide emulsion was sedimented again. The remaining portion of 1500 ml was left, the supernatant was removed, 10 liters of water was further added, and after stirring, the silver halide emulsion was precipitated. After leaving 1500 ml of the sedimented portion and removing the supernatant, the solution H1 was added, the temperature was raised to 60 ° C., and the mixture was further stirred for 120 minutes. Finally, the pH was adjusted to 5.8, and water was added so that the amount of silver was 1161 g per mole of silver, whereby photosensitive silver halide emulsion A was obtained.
[0096]
This emulsion was monodisperse cubic silver iodobromide grains having an average grain size of 0.058 μm, a grain size variation coefficient of 12%, and a [100] face ratio of 92%.
[0097]
[Preparation of powdered organic silver salt A]
130.8 g of behenic acid, 67.7 g of arachidic acid, 43.6 g of stearic acid, and 2.3 g of palmitic acid were dissolved in 4720 ml of pure water at 80 ° C. Next, 540.2 ml of a 1.5 mol / L sodium hydroxide aqueous solution was added and 6.9 ml of concentrated nitric acid was added, followed by cooling to 55 ° C. to obtain a fatty acid sodium solution. While maintaining the temperature of the fatty acid sodium solution at 55 ° C., 45.3 g of the photosensitive silver halide emulsion A and 450 ml of pure water were added and stirred for 5 minutes.
[0098]
Next, 702.6 ml of a 1 mol / L silver nitrate solution was added over 2 minutes and stirred for 10 minutes to obtain an organic silver salt dispersion. Thereafter, the obtained organic silver salt dispersion was transferred to a water-washing container, deionized water was added and stirred, and then allowed to stand to float and separate the organic silver salt dispersion, thereby removing the lower water-soluble salts. Thereafter, washing with deionized water and drainage were repeated until the electrical conductivity of the drainage reached 2 μS / cm, and centrifugal dehydration was carried out. Then, the resulting cake-like organic silver salt was converted into an airflow dryer flash jet dryer (stock) Was dried until the water content became 0.1% according to the operating conditions of nitrogen gas atmosphere and dryer inlet hot air temperature to obtain a dried organic silver salt of organic silver salt A. . An infrared moisture meter was used to measure the moisture content of the organic silver salt composition.
[0099]
[Preparation of Preliminary Dispersion A]
Dissolve 14.57 g of polyvinyl butyral powder (Butvar B-79 manufactured by Monsanto) in 1457 g of MEK, and gradually add 500 g of powdered organic silver salt A while stirring with a dissolver DISPERMAT CA-40M manufactured by VMA-GETZMANN. A preliminary dispersion A was prepared by mixing the above.
[0100]
[Preparation of photosensitive emulsion dispersion 1]
Media type dispersion filled with 80% of the internal volume of 0.5 mm diameter zirconia beads (Traceram manufactured by Toray Industries, Inc.) so that the pre-dispersion liquid A is 1.5 minutes using a pump. A photosensitive emulsion dispersion 1 was prepared by supplying to a machine DISPERMAT SL-C12EX type (manufactured by VMA-GETZMANN) and dispersing at a mill peripheral speed of 8 m / s.
[0101]
(Preparation of stabilizer solution)
A stabilizer solution was prepared by dissolving 1.0 g of Stabilizer-1 and 0.31 g of potassium acetate in 4.97 g of methanol.
[0102]
[Preparation of infrared sensitizing dye liquid A]
1.2 mg of infrared sensitizing dye 1, 1.488 g 2-chloro-benzoic acid, 2.779 g stabilizer-2 and 365 mg 5-methyl-2-mercaptobenzimidazole in 31.3 ml MEK Infrared sensitizing dye solution A was prepared by dissolving at this point.
[0103]
[Chemical 7]
[0104]
[Preparation of additive liquid a]
27.98 g of 1,1-bis (2-hydroxy-3,5-dimethylphenyl) -2-methylpropane as a developer, 1.54 g of 4-methylphthalic acid, 0.48 g of the infrared dye-1 Was dissolved in 110 g of MEK to obtain an additive solution a.
[0105]
[Preparation of additive liquid b]
3.56 g of antifoggant-2 and 3.43 g of phthalazine were dissolved in 40.9 g of MEK to obtain additive liquid b.
[0106]
[Chemical 8]
[0107]
[Preparation of photosensitive layer coating solution]
In an inert gas atmosphere (nitrogen 97%), the photosensitive emulsion dispersion 1 (50 g) and MEK 15.11 g were kept at 21 ° C. with stirring, and the chemical sensitizer Sen-5 (0.5% methanol solution) was kept. ) 1000 μl was added, and after 2 minutes, 390 μl of antifoggant-1 (10% methanol solution) was added and stirred for 1 hour. Further, 494 μl of calcium bromide (10% methanol solution) was added and stirred for 10 minutes, and then a gold sensitizer Au-5 equivalent to 1/20 mole of the chemical sensitizer Sen-5 was added, and further 20 minutes. Stir. Subsequently, 167 ml of the stabilizer solution was added and stirred for 10 minutes, and then 1.32 g of the infrared sensitizing dye solution A was added and stirred for 1 hour. Thereafter, the temperature was lowered to 13 ° C. and further stirred for 30 minutes. While keeping the temperature at 13 ° C., 13.31 g of polyvinyl butyral powder (Butvar B-79 manufactured by Monsanto) was added and stirred for 30 minutes, and then 1.084 g of tetrachlorophthalic acid (9.4 mass% MEK solution) was added. And stirred for 15 minutes. While continuing to stir, 12.43 g of additive liquid a, 1.6 ml of Desmodur N3300 / Mobey aliphatic isocyanate (10% MEK solution), and 4.27 g of additive liquid b were sequentially added and stirred. A layer coating solution was obtained.
[0108]
[Chemical 9]
[0109]
(Preparation of matting agent dispersion)
Cellulose acetate butyrate (Eastman Chemical Co., 7.5 g CAB171-15) was dissolved in 42.5 g of MEK, and 5 g of calcium carbonate (Speciality Minerals, Super-Pflex 200) was added thereto, and a dissolver type homogenizer was used. A matting agent dispersion was prepared by dispersing at 8000 rpm for 30 minutes.
[0110]
(Preparation of protective layer coating solution)
While stirring MEK865g, cellulose acetate butyrate (Eastman Chemical Co., CAB171-15) 96g, polymethylmethacrylic acid (Rohm & Haas Co., Paraloid A-21) 4.5g, vinyl sulfone compound (1,3- 1.5 g of divinylsulfonyl-2-hydroxypropane), 1.0 g of benztriazole, and 1.0 g of F-based activator (Asahi Glass Co., Surflon KH40) were added and dissolved. Next, 30 g of the matting agent dispersion was added and stirred to prepare a protective layer coating solution.
[0111]
(Photosensitive layer side coating)
The photosensitive material coating solution and the protective layer coating solution were simultaneously applied on the undercoat layer of each of the produced plastic films using an extrusion type extrusion coater to prepare a photosensitive material. For coating, the photosensitive layer has a coated silver amount of 1.9 g / m.2The surface protective layer was formed so as to have a dry film thickness of 2.5 μm. Thereafter, drying was performed for 10 minutes using a drying air having a drying temperature of 75 ° C. and a dew point temperature of 10 ° C. 1 (comparative sample) was produced.
[0112]
(Preparation of silver halide photographic material for heat development of Sample Nos. 2 to 26)
Sample No. In place of the protective layer coating solution of Sample 1, sample No. Sample No. 1 was prepared by adding the polymer according to the present invention described in Table 3 of the protective layer coating solution of No. 1 at the quantitative ratio described in Table 3. 2 to 26 protective layer coating solutions were prepared. In the same manner as in the preparation of No. 1, the silver halide photographic light-sensitive material sample No. 2 to 26 (invention) were prepared.
[0113]
(Preparation of silver halide photographic light-sensitive material for heat development of Sample Nos. 27 and 28)
Sample No. of silver halide photographic material for heat development Nos. 27 and 28 were prepared by adding A-06 and B-02 to the photosensitive layer coating solution instead of the protective layer so as to be 20% by mass based on the total amount of binder and polymer in the photosensitive layer.
[0114]
<< Evaluation of silver halide photographic material for heat development >>
Sample No. manufactured as described above was used. 1 to 28 were evaluated as follows.
[0115]
<Stain>: A test developing device that develops at 150 ° C. under a load of 3 kPa by placing a 2.5-cm-diameter silicone rubber heat roller (without a heat source) around a 12-cm-diameter thermal drum. Using the sample of 20 × 30 cm size, the stains of various samples from the 190th sheet to the 200th sheet when the 200 sheets were sequentially heat-developed were evaluated. Here, the level with no dirt was set at 5, the level at which very little dirt was recognized was 4, the level at which slight dirt was found was 3, the level at which some dirt was found was 2, and the level with severe dirt was 1.
[0116]
Table 3 shows the above results.
[0117]
[Table 3]
[0118]
As is apparent from Table 3, it can be seen that the sample of the present invention is less likely to be stained by heat development.
[0119]
【The invention's effect】
According to the present invention, it was possible to provide a silver halide photographic light-sensitive material for heat development with less occurrence of stains due to heat development.
Claims (2)
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| JP2002232778A JP4200711B2 (en) | 2002-08-09 | 2002-08-09 | Silver halide photographic material for heat development |
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| JP2002232778A JP4200711B2 (en) | 2002-08-09 | 2002-08-09 | Silver halide photographic material for heat development |
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