JPH0227386B2 - XSENZOKANSHOTAIDENBOSHISEISENJOEKI - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an antistatic cleaning liquid for X-ray intensifying screens that does not cause intensifying screen contamination and has excellent antistatic properties. Normally, the X-ray film is placed between two pieces of paper and taken. During this handling, that is, when the X-ray film is placed between the intensifying screens or when the X-ray film is taken out from between the intensifying screens, static electricity is generated due to friction between the intensifying screen and the X-ray film, and static electricity is generated when the film is peeled off and this static electricity is discharged. This may cause a malfunction that causes the X-ray film to overlap (referred to as a "static mark malfunction"). This static electricity is particularly likely to occur under low humidity conditions (for example, in winter, in a dehumidified room, etc.). If a static mark failure occurs due to this discharge, there is a risk of making a serious error in diagnosis. Therefore, in order to prevent the generation of static electricity, anti-static sclution, AS
A method has been adopted in which a commercially available antistatic liquid for X-ray intensifying screens called cleaner is applied to the surface of the intensifying screen using gauze or the like. For example, the materials used in these antistatic liquids include
Polyethylene oxide, such as that found in 16425,
Polyalkylene glycol nonionic surfactants such as polypropylene oxide have been widely used. However, although these antistatic liquids were effective in preventing the generation of static electricity immediately after treatment, it was found that they had the following serious drawbacks. That is, when the above nonionic surfactant is applied to the intensifying screen,
It penetrates from the surface of the protective layer of the intensifying screen into the inside of the protective layer and even to the fluorescent layer, and interacts with the substances present in the protective layer and fluorescent layer, causing the screen to turn yellow after long-term use. There are things I end up doing. (This is called "intensifying screen contamination.") If an X-ray film is photographed using this contaminated intensifying screen and then developed, the contaminated area of the intensifying screen will be transferred to the X-ray film as a desensitization mark, and there is a risk of making a serious error in diagnosis. This contamination of the intensifying screen is particularly noticeable when diacetyl cellulose (hereinafter referred to as "DAC") is used for the protective layer of the intensifying screen, and this contamination cannot be removed no matter how much you wipe it afterwards. . In addition, if a nonionic surfactant such as the one mentioned above is used as an antistatic liquid, if the protective layer of the intensifying screen is DAC,
The drawback is that the antistatic effect decreases over time, probably for the same reason that the surfactant soaks into the DAC. The first object of the present invention is to provide an antistatic liquid for X-ray intensifying screens that does not cause intensifying screen contamination. The second object is to provide an antistatic liquid for X-ray intensifying screens that has an excellent antistatic effect on all kinds of X-ray films. The third object is to provide an antistatic liquid for X-ray intensifying screens that has high retention properties for intensifying screens. Fourthly, the hand marks and developer that adhered to the surface of the intensifying screen,
To provide an antistatic liquid for an X-ray intensifying screen that can easily wipe off stains from lipstick, etc. The fifth object is to provide an antistatic liquid for X-ray intensifying screens that does not irritate the skin. The sixth object is to provide an antistatic liquid for X-ray intensifying screens that has excellent stability over time. The seventh object is to provide an antistatic liquid for X-ray intensifying screens that does not contain a large amount of organic solvent. The eighth object is to provide an antistatic liquid for X-ray intensifying screens that does not have any adverse effect on photographic properties. It has been found that these objects can be achieved by an antistatic cleaning liquid containing at least one of the following amphoteric surfactants as a main component. That is, at least one compound selected from an alkylammonium carboxylic acid betaine compound and an alkylammonium sulfonic acid betaine compound.
Antistatic cleaning liquid containing 0.1 to 20% by weight. Next, typical examples of compounds used in the present invention are shown. The amphoteric surfactant used in the present invention has an alkyl group or an alkenyl group having 6 to 20 carbon atoms as a hydrophobic group, and a carboxyl group or a sulfone group is preferable as an anionic group, and a particularly preferable one is carboxyl betaine. It is. These amphoteric surfactants used in the present invention can be easily synthesized by conventional methods.
of Zui American Chemical Society Vol. 69, p. 2095 (published in 1947) and Special Publication of the 1970s
It can be easily synthesized by the method described in -5048 specification. Synthesis Example (Compound 1) Synthesis of N-dodecyl N,N-dimethylamine Dissolve 1 mole of dodecylamine in 300 ml of ethanol, and add 85% Formic Acid 260 to this.
ml dropwise while keeping it at 30-40℃. Next, 210 ml of 37% formaldehyde is added dropwise at the same temperature. After the addition is complete, the mixture is refluxed until no carbon dioxide gas is generated.
After cooling and neutralizing with caustic soda, toluene is added to separate into two layers, and the upper layer is distilled. N-dodecyl N,N
-dimethylamine 170g (yield 80%, b, p94
℃/1mm) is obtained. Synthesis of N-dodecyl N,N'-dimethyl-α-carboxylic acid betaine N-dodecyl N,N'-dimethylamine was mixed with an aqueous monochloroacetic acid aqueous solution at 70-80℃4 by a conventional method.
Stirring for ~5 hours yields alpha-carboxylic acid betaine. This crude product is purified by recrystallization from acetone. The above surfactant is 0.1 to 20% by weight in the antistatic liquid,
Preferably it is contained in an amount of 1 to 10% by weight. It is preferable that the antistatic liquid of the present invention contains only surfactants belonging to or, but other surfactants may be used in combination if necessary. Examples of other surfactants include cationic, anionic, and nonionic surfactants, but as explained above, the amount of nonionic surfactants is preferably less than 10% by weight based on the surfactant of the present invention. Furthermore, it is preferably 5% by weight or less. In addition, for cationic and anionic surfactants, it is preferable that the amount is 50% by weight or less, and more preferably 20% by weight or less, based on the surfactant of the present invention.
It is preferable that it is less than % by weight. These surfactants include nonionic surfactants C ₈ H ₁₇ O (CH ₂ CH ₂ O) ₅ H, C ₁₀ H ₂₁ O (CH ₂ CH ₂ O) ₅ H, anionic surfactant

【formula】 【formula】

cationic surfactant etc. In addition to these surfactants, other substances such as matting agents can be contained as necessary. Examples of the matting agent include SiO ₂ and the like. The amount of matting agent added is 0.001 to 10% by weight relative to the surfactant, and further 0.01% by weight.
The content is preferably 1% by weight. Although the surfactant of the present invention is originally water-soluble, an organic solvent such as methanol or ethanol can be added as necessary. However, since antistatic cleaning liquids for X-ray intensifying screens are generally used in closed rooms such as darkrooms, it is preferable to avoid adding organic solvents. When antistatic effects are desired, some cationic, anionic, and nonionic amphoteric surfactants have been found to be effective, but our research has shown that there are no surfactants that satisfy all of the objectives of the present invention. Among this huge number of surfactants, only the surfactant of the present invention was found. A characteristic feature of the surfactant used in the present invention is that it exhibits its antistatic effect regardless of the X-ray film used. X-ray film uses various additives in its surface layer to satisfy various performances, and the surface condition varies depending on each X-ray film manufacturer.
The reality is that each X-ray film type differs greatly. Therefore, it is thought that the charging properties vary greatly depending on each film. However, surprisingly, the surfactant of the present invention exhibited an excellent antistatic effect regardless of the type of film. This is a feature not found in other surfactants. The antistatic liquid of the present invention can be extremely advantageously used in an intensifying screen in which the binder of the surface protective layer is DAC. The surfactant of the present invention has excellent performance as described above, and has an excellent antistatic effect not only in X-ray intensifying screens but also in locations where static failure occurs, such as in the conveyor system rollers. Indicated. It is also believed that the technology of the present invention can be applied to photosensitive materials other than X-ray photosensitive materials, such as color photosensitive materials and printing photosensitive materials. The antistatic liquid of the present invention can be applied to the intensifying screen by soaking it in gauze or the like and wiping the surface of the intensifying screen, or by spraying it onto the surface of the intensifying screen. The present invention will be further explained below with reference to Examples, but the present invention is not limited to these Examples. Note that the adhesion test in the examples was conducted by the following method. (1) Intensifying screen contamination test LT- (Kasei Optonics)
A protective layer DAC intensifying screen (manufactured by Co., Ltd.) was applied, and 1 c.c. of various antistatic liquids (3% by weight aqueous solution) soaked in gauze was applied to the surface of the intensifying screen and left at room temperature to dry for 2 hours. After adjusting the humidity to 30° C. and 80% RH for 1 hour, RX X-ray film (manufactured by Fuji Photo Film Co., Ltd.) was placed and left for 5 minutes, then the X-ray film was replaced and left for 5 minutes.
In this way, 2,000 pieces of X-ray film were processed, and the degree of contamination of the intensifying screen was visually determined.
If it is not contaminated at all, mark it as 〇, if it is partially contaminated, mark it as △, and if it is completely contaminated, mark it as ×. (2) Antistatic property test Hi Screen Standard (Kasei Optonics
Protective Layer Polyethylene Terephthalate Co., Ltd. (hereinafter abbreviated as "PET") Hi Screen Standard (Kasei Optonics Co., Ltd.)
Protective Layer DAC Co., Ltd.) LT- (Kasei Optonics Co., Ltd. Protective Layer
Gauze was soaked with 1 c.c. of various antistatic liquids (3% by weight aqueous solution) and applied to three types of intensifying screens (DAC), and left at room temperature to dry for 2 hours. Then 25℃, 25%
After adjusting the humidity to RH for 3 hours, the surface resistivity was measured. To measure the surface resistivity, a test piece of intensifying screen coated with antistatic liquid was sandwiched between Machiyu electrodes (the part in contact with the test piece was made of stainless steel) with an electrode spacing of 0.14 cm and a length of 10 cm, and a Takeda Riken insulation meter was used. (TR-
8651) for 1 minute. (The smaller the surface resistivity value is, the greater the antistatic effect is.) The static mark generation test uses a sample prepared for the antistatic property test, and an unexposed X-ray film is sandwiched between the surface coated with the antistatic liquid. After rubbing with a rubber roller, the X-ray film is then taken out from between the intensifying screens and developed. At this time, if static marks do not occur at all, 〇, if some static marks occur, △, if they occur all over, ×
shall be. (3) Retention test on intensifying screen Hi Screen Standard (protective layer DAC, PET)
Apply various antistatic liquids in the same manner as above. twenty five
After adjusting the humidity to 25% RH for 3 hours, the surface resistivity was measured, and then the test piece was rubbed 10 times with a flannel on one side, the surface resistivity was measured again, and the degree of deterioration of the surface resistivity was judged. Example

[Table] 〓C ₁₃ H ₂₇ COONa
10 copies〓

Claims (1)

[Claims] 1 At least one compound selected from an alkylammonium carboxylic acid betaine compound and an alkylammonium sulfonic acid betaine compound.
An antistatic cleaning liquid for X-ray intensifying screens characterized by containing 0.1 to 20% by weight.