JPS5830436B2 - Tennen Hikakuno Tenshiyachiyakushiyokuhou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for coloring natural leather using a thermal transfer method.

The present inventor first formed an arbitrary pattern on a base sheet, and melted, evaporated, or melted the arbitrary pattern by heat.
A transfer sheet comprising a coloring agent having the property of being transferred by a phenomenon such as sublimation, and an agent having the property of acting on the colorant to increase the thermal transferability of the colorant, and a thermal transfer coloring using the transfer sheet. (Japanese Patent Application No. 47-49136 and 47-49137)
(see issue).

Therefore, in the above transfer sheet and the thermal transfer coloring method using the same, when the transfer substrate is natural leather, the natural leather is acid-treated, and the above transfer sheet is applied using this as the transfer substrate. It was discovered that by thermally transferring the natural leather using this method, it was possible to produce beautifully colored natural leather products with extremely vivid color tones and excellent fastness properties without impairing the breathability, texture, and other characteristics of the natural leather. Thus, the present invention was completed.

That is, the present invention provides, on a base sheet, a coloring agent having the property of being transferred by phenomena such as melting, evaporation, and sublimation due to heat, and a property of acting on the colorant to increase the thermal transferability of the colorant. A transfer sheet is prepared by forming an arbitrary pattern containing a chemical agent, and on the other hand, acid treatment is applied to the natural leather, and then the patterned surface of the transfer sheet and the surface of the natural leather are overlapped, and then After that, both of them are subjected to heating and pressure treatment, and then the base sheet of the transfer sheet is peeled off, and the coloring agent in the pattern of the transfer sheet is transferred onto the natural leather to color the natural leather. This is a transfer coloring method for natural leather that is characterized by:

The above-mentioned present invention will be explained in more detail below.

First, in the present invention, the transfer sheet will be explained. In such a transfer sheet, the base sheet is preferably one that is not affected by various conditions such as conditions for forming an arbitrary pattern or heat transfer conditions. For example, Use various papers or processed papers, cellophane, various heat-resistant resin films or sheets, various metal foils or plates, or lamination films made by arbitrarily laminating these in accordance with conventional methods. can do.

Next, as the colorant in the above transfer sheet, any colorant can be used as long as it exhibits phenomena such as melting, evaporation, or sublimation due to heat and can be transferred to other substrates. I can do it.

In the present invention, the above-mentioned colorants can be broadly classified into two types, one of which is thermal transfer, which exhibits phenomena such as melting, evaporation, or sublimation due to heat and is transferred to another base material. One colorant has a relatively large property and is often used in the conventional sublimation transfer method. It is a coloring agent that has relatively low thermal transferability to materials and is rarely used in conventional sublimation transfer methods.

To give an example of the above-mentioned colorants, as the former colorant, disperse dyes can be used as the most typical ones, and specifically, for example, Seriton True Blue FFB (C, I .

62035) Seriton Scarlet B (C, I.

11110), Seriton True Yellow RR (C.

r, 11345).

Further, as the latter coloring agent, for example, basic dyes (cationic dyes), acidic dyes, oil-soluble dyes, or the above-mentioned disperse dyes having low thermal transferability can be used.

Specifically, for example, 3,3'-diethyloxathiacyanine iodide, Astrazone Pink FG (manufactured by Bayer AG, C, 1,48015), 2,2'-carbocyanine (C, T, '808) , Astraphylloxin F
F (C, I, 48070), Alastrazone Yellow 7GLL (C, 1, Basic Yellow 21), Eisen-Cachiron Ero-30LH (manufactured by Hodogaya Chemical KK,
C, 1,48055), Eisen Cachiron Red 6B
Monomethine series such as H(C,I, 48020), etc.
Methine (cyanine) basic dyes such as dimethine or trimethine, diphenylmethane basic dyes such as auramine (C, 1,655), malachite green (C, 1,42000), brilliant green (
C, 1, 42040), Mazienk (C, I.

42510) Methyl violet (C,I.

42535), Crystal Violet (C.

1.42555), Methyl Green (C,I.

684), Victoria Blue B (C, I.

triphenylmethane-based basic dyes such as 44045), pyronine G (C, I', 739), rhodamine B (C
, 1,45170), Rhodamine 6G (C, 1,451
60), acrazine yellow G (C,1,'785), leonine AL (C,1
, 4,6075), benzoflavin (C, l-791)
, phosphine (C.

acridine basic dyes such as Neutral Red (C, 1,50040), Astrazone Blue BGE/X125 (C, 46045), etc.

1.51005), methylene blue (C,I.

52015), basic dyes such as anthraquinone basic dyes with quaternary amines, light green 5F (C, 1,4209
5), xylenebu/L/-VS (C, 1,672),
Acid Violette 4B (C, 1, 42650),
Triphenylmethane acid dyes such as Eosin G (C
,I.

45380), other acid dyes such as anthraquinone acid dyes, Orazole Prilliant Scarlet 5B (manufactured by Ciba), Subiron Fiery Red BH (C.

(3), Solvent Red 81), Zapon Fast Red 3B (manufactured by BASF), and other oil-soluble dyes, as well as oxy-fuchsone dyes, etc. can be used.

6. In the present invention, among the above coloring agents, the use of basic dyes shows the most favorable results,
It is the most desirable material.

Furthermore, in the present invention, among the above colorants, when the former colorant is used, there is a great advantage that the thermal transfer conditions etc. can be relaxed, and when the latter colorant is used, This method has the great advantage that colorants that are difficult to use in conventional methods can be applied to the transfer method, and the range of application of the transfer target substrate can thereby be significantly expanded. .

Therefore, in the present invention, although the former heat transfer method using the colorant is also useful, the latter heat transfer method using the latter colorant is extremely useful from an industrial implementation standpoint.

Furthermore, in the transfer sheet as described above, a chemical agent having a property of acting on the colorant as described above to increase the thermal transferability of the colorant can be used as the agent.

Examples of the above-mentioned chemicals include bases.

Oxidizing agents etc. can be used, specifically, for example, alkali metal hydroxides such as lithium hydroxide, sodium hydroxide, potassium hydroxide, beryllium hydroxide, magnesium hydroxide, calcium hydroxide. , hydroxides of alkaline metals such as barium hydroxide, strontium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, magnesium carbonate, calcium carbonate, barium carbonate, strontium carbonate, sodium acetate, and other strong or weak bases and weak acids. Salts, other bases such as amines such as aqueous ammonia, dimethylformamide, ethanolamine, triethanolamine, permanganic acid or its salts such as permanganic acid, potassium permanganate, sodium permanganate, chromic acid, chromium Chromic acid or related compounds such as potassium acid, potassium dichromate, sodium chromate, sodium dichromate, magnesium chromate, calcium chromate, potassium chlorochromate, chromyl chloride, hydrogen peroxide, peroxide Nato IJum, barium peroxide,
Examples include peroxides such as calcium peroxide, oxidizing agents such as metal salts such as ferric chloride, cupric sulfate, cupric chloride, copper acetate, and bismuth acetate.

Furthermore, in the present invention, agents that have the property of decomposing with heat and acting on the colorant to increase the thermal transferability of the colorant, such as compounds that become bases when decomposed by heating; It is possible to use a substance that generates oxidizing agents or a compound that can be decomposed by heating to become an oxidizing agent.

Specifically, for example, ammonium acetate, ethyl urea, ammonium oxalate, ammonium, chromium alum, thiourea, oxalates of aliphatic amines such as dicyclohexylamine, oxalates of aromatic amines such as benzylamine, and pyridine. Oxalates of cyclic amines such as morpholine, related compounds of chromic acid, organic peroxides, etc. can be used.

In the present invention, the amount of the above-mentioned chemical agent used can be 1/10 to 20 molar equivalent per 1 molar equivalent of colorant, but 1 to 10 molar equivalent per 1 molar equivalent of colorant.
It is particularly preferred to use molar equivalents of drug.

Next, in the above-mentioned present invention, the method for manufacturing a transfer sheet will be explained. Such a transfer sheet is made by adding a colorant having a property of transferring by heat-induced melting, evaporation, sublimation, etc. onto a base sheet, and the coloring agent. It can be produced by various methods depending on the method of applying the agent and the agent having the property of increasing the thermal transferability of the coloring agent.

For example, by using an ink or coating composition containing a binder, a coloring agent, and a drug as main components on an arbitrary base sheet, for example, characters, symbols, etc. , an arbitrary pattern is formed on the base sheet by forming an arbitrary monochrome or multicolor pattern such as a picture, and a coloring agent and a chemical are present in the arbitrary pattern portion. It is possible to produce a transfer sheet that is

Alternatively, in the present invention, an ink or coating composition containing a binder and a colorant as main components is used on any base sheet in advance, and a conventional printing method is applied in the same manner as above.
By forming an arbitrary monochromatic or multicolored pattern using a drawing method or a coating method, and then applying a composition containing a drug as a main component onto the arbitrary pattern, the composition is formed on the base sheet. It is possible to manufacture a transfer sheet on which an arbitrary pattern is formed and a colorant and a chemical are present in the arbitrary pattern portion, or, contrary to the above, it is possible to produce a transfer sheet in which a desired pattern is formed on the surface of the transfer sheet. A composition containing a drug as a main component is applied onto an arbitrary base sheet, and then an arbitrary monochrome or multicolor pattern is formed thereon using an ink or coating composition containing a binder and a drug as main components. By doing so, it is possible to produce a transfer sheet in which an arbitrary pattern is formed on the base sheet, and a colorant and a chemical are present in the arbitrary pattern portion.

Furthermore, in the present invention, a coloring agent is treated in advance with a composition containing a drug as a main component, and then the treated coloring agent is used to form a composition containing a coloring agent and a binder as main components. By using an ink or coating composition and forming any monochrome or multicolor pattern on any base sheet by a normal printing method, drawing method, coating method, etc. in the same manner as above, the base sheet can be formed. It is possible to produce a transfer sheet on which an arbitrary pattern is formed, and in which the above-mentioned colorant and drug are present in the arbitrary pattern portion.

In the present invention, it is preferable to manufacture the transfer sheet by selecting the most advantageous method from the above-mentioned manufacturing methods according to the purpose and the like.

In addition, in the method of manufacturing the transfer sheet as described above in the present invention, the methods as described above may be used in combination, and for example,
The coloring agent, drug, etc. may be microencapsulated in accordance with a conventional method, or the microcapsules may be destroyed by heat transfer conditions described below, and the two may interact with each other.

Furthermore, in the present invention, the arbitrary pattern formed on the base sheet may be a solid colored layer containing a colorant and a chemical.

In addition, as the binder in the above-mentioned method of manufacturing a transfer sheet, known ones such as methyl cellulose, ethyl cellulose, carboxymethyl cellulose, cellulose acetate butyrate, cellulose acetate, cellulose derivatives such as sodium alginate and its derivatives, polyvinyl alcohol,
Polyvinyl acetate, polycarbonate resin, polyester resin, polyamide resin, phenol resin, aminoplast resin, unsaturated carboxylic acids such as acrylic acid, methacrylic acid, itaconic acid, fumaric acid, maleic acid, or these unsaturated carboxylic acids Ester derivatives of acids, nitrile derivatives or amide derivatives of acids, vinyl chloride, vinylidene chloride, vinyl acetate, styrene, vinylpyrrolidone, vinyl methyl ether, butadiene,
Homopolymers of various vinyl monomers such as ethylene and propylene or copolymers thereof, starch, gum arabic, gum tragacanth, gelatin, etc. can be used.

It should be noted that it is not preferable for the above-mentioned binder in the present invention to be one that softens or melts due to heating temperatures such as heat transfer conditions.If the binder softens or melts, the binder itself may also be exposed during heat transfer. This is undesirable because it may transfer onto the transfer base Murakami, resulting in a transferred product with poor texture, etc.

In addition, in the method for manufacturing the transfer sheet as described above, in addition to the binder, colorant, and drug as described above, if necessary, for example, when the colorant is transferred onto the transfer substrate, A coloring aid, a binder, a colorant, which penetrates into the base material and has the effect of swelling between micelles and increasing the permeability of the colorant, etc.
Alternatively, various additives and the like that adjust the state of the composition containing drugs and the like can be optionally used.

Examples of the above-mentioned coloring aids include urea, naphthalene, ammonium tartrate, oxalates of aliphatic amines such as glinicin A1 cyclohexylamine, ammonium acetate,
Various surfactants such as benzylamine, anionic, nonionic, or amphoteric surfactants can be used, and the above additives include, for example, plasticizers, stabilizers, waxes, greases, drying agents, etc. Agents, supplementary desiccant agents, curing agents, emulsifiers, thickeners, fillers, dispersants, etc. can be used.

In addition, in the present invention, when the transfer sheets manufactured by the above method are stacked and stored, the colorant having heat transferability and the colorant forming the pattern of one transfer sheet with the passage of time. Since the agent that has the property of increasing transferability due to heat transfers to the base sheet of other transfer sheets and causes contamination, the amount of coloring agent present on the transfer sheet decreases, and when the transfer sheet is used, the transfer The transfer density may gradually decrease, the transfer may be unclear, or in extreme cases, the transfer may become unusable, resulting in unsatisfactory storage stability.

In such a case, in the present invention, a transfer sheet consisting of a base sheet in which an arbitrary pattern containing a colorant and a chemical is formed, and a resin test is further formed on the base sheet, or a transfer sheet on which a resin test is formed on the base sheet. , a transfer sheet consisting of a structure in which a resin test is provided in advance, an arbitrary pattern containing a colorant and a chemical is formed on the resin, and the resin test is again formed on top of that. Furthermore, an arbitrary pattern containing a colorant and a chemical is formed on the base sheet, a resin test is formed on the base sheet, and another resin test is formed on the back side of the base sheet. The transfer sheet has a configuration in which a resin test is provided in advance on the base sheet, an arbitrary pattern containing a coloring agent and a chemical is formed on it, and the resin is further applied on the base sheet. A transfer sheet having a structure in which a resin test material is formed on the back side of the base sheet, and an arbitrary pattern containing a colorant and a chemical is formed on the base sheet. However, on the other hand, it is preferable to use a transfer sheet or the like having a structure in which a resin test material is formed on the back side of the above-mentioned base sheet.

In the present invention, by providing the resin test as described above, it is possible to prevent contamination by contacting the patterned surface of the transfer sheet, and to prevent colorants, chemicals, etc. from damaging the base sheet constituting the transfer sheet. The colorant can improve staining properties caused by permeation and migration, and can also be used to prevent transfer sheets from being stacked during storage.

When used as a transfer sheet, the colorant does not transfer from one transfer sheet to another, and also does not penetrate or transfer through the base sheet itself that makes up the transfer sheet. The density of the image does not decrease, the transfer becomes unclear, or the transfer becomes impossible.

In particular, in the present invention, since the colorant and the chemical coexist in the pattern of the transfer sheet, the colorant migrates more easily due to the action of the chemical. is formed, it can effectively prevent colorant migration during storage of the transfer sheet,
It shows extremely excellent storage stability.

Furthermore, in the present invention, even if the temperature inside the storage room suddenly rises while the transfer sheet is being stored, the coloring agent in the pattern on the transfer sheet is not affected by the resin test formed on the transfer sheet. It is possible to measure storage stability by inhibiting migration.

In the present invention, the resins constituting the resin test include, for example, polyvinyl alcohol, sodium polyacrylate, polyacrylamide, mapro gum, dextrin, methyl cellulose, carboxymethyl cellulose, polyvinyl pyrrolidone, polyvinyl methyl nitellar maleic acid. Copolymers, water-soluble thermosetting acrylic resins, British gum, casein, crystal gum, gum arabic, gum tragacanth, rosin-modified maleic acid resins, ester gums, rosin-modified phenolic resins, hard resins such as xylene resins, polyvinyl chloride, Examples include polyvinyl acetate, acrylic esters, polyamide, polyurethane, polyester butyral resin, epoxy resin, urea resin, melamine resin, cellulose acetate butyrate, thermosetting acrylic resin, polystyrene, petroleum resin, and the like.

Next, in the transfer sheet of the present invention, methods for forming the resin test include, for example, applying a resin composition containing the resin as a main component to roll coating, gravure coating, barcode coating, etc. It can be coated by a conventional coating method such as air knife coating or screen coating, or by laminating a film or sheet-like material made by copying the above resin by a conventional method. can.

In addition, in the above, the amount of coating depends on the purpose,
0.2g/m' to 4g depending on the resin used
/rn' is preferred.

Next, in the present invention, the acid treatment of natural leather will be explained. First, in the present invention, natural leathers include various kinds of leather such as cow, horse, wild sheep, pig, deer, kangaru-1, etc. animal skins can be used, and
Either raw leather or tanned leather can be used.

Next, in the acid treatment of natural leather as described above, the acid has the property of acting on the coloring agent on the natural leather transferred from the transfer sheet, improving its dyeability, fastness, etc., and producing good color development. An acidic substance having a

Examples of the above acidic substances include inorganic acids such as chromic acid and hydrochloric acid, organic acids such as tannic acid, acetic acid, and benzoic acid, acrylic acid, itaconic acid, fumaric acid, maleic acid,
Examples include polymers having acid groups, such as vinyl homopolymers of unsaturated carboxylic acids or vinyl copolymers with other vinyl monomers.

Next, to explain the acid treatment method, any method that can apply the above-mentioned acid-containing solution to natural leather may be used. For example, ordinary methods such as dipping spraying and coating may be used. I can do it.

In the above, the treatment liquid may be any aqueous or solvent-based liquid, and its concentration may be 0.
It is preferable to treat with a solution of 5 to 10, preferably 0.5 to 5.

Next, in the above-mentioned present invention, a method of heat transfer using the above-mentioned transfer sheet and natural leather will be explained.
First, in the present invention, the above-mentioned transfer sheet and natural leather are overlapped so that any patterned surface of the former is in contact with the surface of the latter, and then heated and pressed with a heated hot-pressing plate or the like or heated. The colorant in any pattern on the transfer sheet is transferred onto the natural leather by passing it between heated rollers and subjecting it to heat and pressure treatment, and then peeling off the transfer sheet. , it is possible to obtain transfer products that have extremely clear color tones and are rich in various fastness properties.

In the heat transfer method as described above, the heating temperature does not need to exceed the melting point or sublimation point of the colorant itself used to manufacture the transfer sheet, and varies depending on the type of colorant, etc., but is about 0. It is preferable to arbitrarily select the temperature from the range of ℃ to 250'C.

In addition, in the above, the pressurizing condition is about 5og/=~20k
g/i is preferred.

Furthermore, the time for performing the heating and pressure treatment in the above is about 1
The time is preferably 0 seconds to 90 seconds.

In the present invention, a transfer sheet in which a colored layer containing a colorant and a drug is formed on a base sheet is used as the transfer sheet, and any openings are formed on the colored layer of the transfer sheet. It can also be carried out by a method in which mask materials having an image are layered, natural leather is further layered thereon, and heat and pressure treatment is performed in the same manner as described above to carry out thermal transfer.

In the above, the mask material is a known material, for example, a mimeograph paper such as a draft paper, a type stencil paper, a ballpoint pen base paper, or a heat-sensitive stencil paper, which is subjected to stencil processing to form characters, symbols, etc. Those formed with arbitrary aperture images such as figures and patterns, or screen printing plates (stencils for screen printing) having arbitrary aperture images used in screen printing, and also 'For example, various synthetic resin films. Characters, symbols, and figure bundles can be made into arbitrary patterns such as pictures by punching or corroding base materials such as sheets, various papers, various metal foils, or thin metal plates. A device with an aperture image formed thereon can be used.

Alternatively, in the present invention, for example, a photosensitive dry film such as DuPont's Norstone film or Dynachem's Laminar film is exposed in a conventional manner.
It is also possible to use those obtained by developing and fixing to form an arbitrary aperture image.

The present invention will be described in more detail below with reference to Examples.

Note that the middle part of the examples is parts by weight. Example 1 70 parts of ethylcellulose (manufactured by Bercules, trade name: ethylcellulose N7CP), Astrazone Blue BGE
70 parts of /X120%(C, A blue ink composition was obtained.

Next, using the blue ink composition obtained above, a predetermined pattern was printed on gravure paper by a gravure method to obtain a transfer sheet.

Next, cowhide having a thickness of LOmrn was immersed in a 1.0% chromic acid aqueous solution for 10 minutes, squeezed at a squeezing ratio of 80, and dried at 80° C. for 30 minutes.

Next, the transfer sheet obtained above and the chromic acid-treated cowhide were stacked together and heated in a heat press at 1.80°C for 20 seconds, and then the transfer sheet was peeled off, resulting in a vividly colored dark blue. Transfer leather was obtained.

The fastness of the above transfer product was good and fully satisfactory.

Similar results were also obtained when the following colorant was used in place of Astrazone Blue BGE/120%.

(A)AIZEN Ba5ic Cyanine
6GH (C, 1,42025 IJ phenylmethane basic dye) (b)'AIZEN Methylene
Blue FZ (C, 1,5201,5 thiazine basic dye) (c) AIZEN Cathilon
Brilliant Yellow GCH (C, 1, Ba5ic Yellow 13 cyanine basic dye) AStrazon Red 6B (C, 1,48020 methine basic dye) (E) AI
ZEN Cathilon Orang RH (C, 1
, 48040 Methine basic dye) (to) AIZEN
Malachite Green (C, 1,42000
triphenylmethane (triphenylmethane) (g) A
IZEN Cathilon Br1llia
nt PinkBH (C, 1, Ba5ic Red3
6 Methine basic dye) (] Astrazon
Pink FG (C, 1,48015 methine basic dye) Example 2 100 parts of ethyl cellulose N-7CP, dye; Astradune Blue B G E/X (C, 1,51005)
Solvent: xylene-butanol (8:2) 80 parts
0 parts were mixed in a ball mill and sufficiently kneaded to obtain a blue ink composition.

Next, a predetermined pattern was printed on gravure paper using the blue ink composition obtained above using a gravure method.

Next, NaOH was added to 96 parts of a 4% aqueous solution of methylcellulose (trade name Metrose 65SI (50) manufactured by Daiichi Kogyo Seiyaku KK).
4 parts was dissolved, and this aqueous alkaline solution was used to overcoat the dye layer of the printed sheet using Shaver 4 and sufficiently dried to prepare a transfer sheet.

Next, a piece of pork skin with a thickness of 1.0 mm was immersed in a 2% tannic acid aqueous solution for 15 minutes, and then squeezed at a squeezing rate of about 80 mm.
It was thoroughly dried at 0°C.

Overlap the above transfer sheet and tannic acid-treated pork skin 180
Pressing was performed for 30 seconds using a press plate heated to .degree. C., and when the transfer sheet was peeled off, a deep blue colored pigskin was obtained.

The fastness was good.

Example 3 50 parts of ammonium dichromate was added to 950 parts of a 15-dah aqueous solution of polyvinyl alcohol (manufactured by Nippon Gosei Kagaku Kogyo KK, trade name: Gohsenol 1173), and thoroughly kneaded in a ball mill.

Next, ammonium dichromate aqueous solution 900% obtained above
Part and dye Eisen Cachilon Blue 50 (C, 1, 5
A blue ink composition was obtained by thoroughly kneading 100 parts of 100 parts of 1oos', ) in a ball mill.

Next, using the blue ink composition obtained above, a predetermined pattern was printed on gravure paper using a silk screen and sufficiently dried to obtain a transfer sheet.

Next, a piece of cowhide with a thickness of 1.0 mounds was immersed in a 0.5% tannic acid aqueous solution for 10 minutes, and then squeezed 50 times at a squeezing rate of 80%.
It was thoroughly dried at ~80°C.

Layer the above transfer sheet and tannic acid treated cowhide, 2
After thermal transfer for 15 seconds in a press heated to 00°C, the transfer sheet was peeled off to obtain cowhide colored deep blue.

The fastness of this product was good and fully satisfactory.

Example 4 (1) 120 parts of ethyl cellulose N7CP, Astrazone Yellow 7GLL (C, 1, Basic Yellow 2
1. 100 parts of methine-based basic dye) were added to 780 parts of a mixed solvent of xylene and butanol (mixing ratio 8:2) and thoroughly kneaded in a ball mill to obtain a yellow ink composition.

Next, methylcellulose 65SH506 polyaqueous solution 96
Using an alkaline aqueous solution in which 40 parts of NaOH was dissolved in 0 parts, coated paper was coated with Myabah #8.
Dry thoroughly.

Next, a predetermined pattern was printed on the alkali coated surface using the above yellow ink composition to obtain a transfer sheet.

(ii) 80 parts of Crystal Violet (C, I.

42555) in 1720 parts of water and then 4% Na
200 parts of an OH aqueous solution was gradually added to the above dye solution, and after the addition was completed, it was left for 15 minutes.

The resulting precipitate was separated by filtration, washed with water, and thoroughly dried.

Next, 70 parts of the alkali-treated Crystal Violet and 120 parts of ethyl cellulose N7CP were mixed in a mixed solvent of xylene and butanol (mixing ratio 8:2) at 810 parts.
The mixture was mixed and thoroughly kneaded in a ball mill to obtain a purple ink composition.

Using the purple ink composition, a predetermined pattern was printed on gravure paper using a gravure method to obtain a transfer sheet.

(111) Kasuga Paper KK Uniwrap 55 kg/
m'') was coated with an undercoat layer using a rotogravure rotary press using the coating liquid shown below.

In addition, drying was performed sufficiently.

The coating amount was 2-3 g/rrt. Next, create yellow, red, and blue inks with the following composition, and use these three colors of ink to print a predetermined pattern on the undercoat layer using a gravure printing machine to print multicolor prints. I got it.

The printing speed was 30 m/min.

Next, a transfer sheet was obtained by coating the printed surface of the multicolored printed matter with a top coat layer using the coating liquid shown below.

The coating method was according to Example 1.

The application amount was approximately 1-2 g/rrl. Coating liquid lol! i6 product and resin name.

(iv) A lower arch layer was formed using a 15% polyvinyl alcohol aqueous solution on a 55 kg/m knee wrap manufactured by Kasuga Paper Industries KK.

Then, after sufficiently drying, methylcellulose 65SH506
Coating was performed using an oxidizing agent aqueous solution prepared by dissolving 20,760 parts of Na2 Cr in 940 parts of a multi-aqueous solution, a chemical layer was formed, and the coating was thoroughly dried.

Next, 120 parts of ethyl cellulose N7CP, Eisenki Chiron Red 6BH (C).

1.48020) was added to 780 parts of a mixed solvent of xylene and butanol (mixing ratio 8:2) and sufficiently kneaded in a ball mill to obtain a red ink.

Using the ink composition, printing was performed on the above drug layer using a gravure printing machine to form a predetermined pattern.

Next, coating was performed on the above pattern using a 15% butyral resin solution (a mixed solvent of toluene and IPA) using a gravure printing machine to apply a top coat layer to obtain a transfer sheet.

The amount of coating was approximately 1.29771 t.

Using the transfer sheet obtained in ([) to (IV) above,
When the cowhide of Example 1 was transferred and colored in the same manner, Example 1
A colored leather similar to that was obtained.

Claims (1)

[Claims] 1. Contains on a base sheet a coloring agent that has the property of transferring due to phenomena such as melting, evaporation, and sublimation due to heat, and an agent that has the property of acting on the colorant and increasing the heat transferability of the colorant. A transfer sheet is constructed by forming an arbitrary pattern, and natural leather is then acid-treated, and then the patterned surface of the transfer sheet and the surface of the natural leather are overlapped, and then both are heated. Pressure treatment is applied, and then the basic sheet of the transfer sheet is peeled off, and the coloring agent in the pattern of the transfer sheet is transferred onto the natural leather to color the natural leather. Transfer coloring method for natural leather.