JPH0231754B2 - TAIDENBOSHISEISENJOEKI - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an antistatic cleaning liquid that does not cause intensifying screen staining and has excellent antistatic properties. Normally, X-ray film is sandwiched between intensifying screens and images are 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 charging when peeled off, and this static electricity is discharged. This may cause a malfunction that causes the X-ray film to become covered (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 solutions and 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. The materials used in these antistatic liquids include polyoxyethylene-polyoxypropylene, primary alcohol alkoxylate, and secondary alcohol alkoxylate, as seen in JP-A No. 56-28263. at least 2 of them
A mixture of types was used. However, these antistatic liquids are not necessarily effective against various types of X-ray films, and have the disadvantage that although they may have an antistatic effect on some types of film, they have almost no effect on other films. It was hot. Furthermore, even though it is effective in preventing static electricity generation immediately after application,
If the above mixed surfactant is applied to an intensifying screen and used repeatedly, this effect will disappear,
Static electricity is generated due to frictional peeling between the intensifying screen and the X-ray film, and as this discharges,
The disadvantage was that static mark failures occurred. Such static failures should never occur because they may cause serious errors in diagnosis. In addition, there are many chemicals already known in the world that can prevent the generation of static electricity, but there are only a few chemicals that can be used in systems that come into contact with photographic film, whose properties can be greatly affected by extremely small amounts of chemicals. is extremely limited, and therefore, no antistatic liquid has been found so far that has an effective antistatic effect on the intensifying screen that is the object of the present invention. Therefore, the purpose of the present invention is, firstly, to
An object of the present invention is to provide an antistatic liquid having an excellent antistatic effect. The second objective is to provide an antistatic liquid that has high retention properties for intensifying screens and the like. The third object is to provide an antistatic liquid that does not have any adverse effect on photographic properties. Fourthly, it is an object of the present invention to provide an antistatic liquid that can easily wipe off stains such as hand marks, developer, lipstick, etc. adhering to the surface of an intensifying screen. Fifth, it is to provide an antistatic liquid that does not irritate the skin. Sixthly, it is possible to provide an antistatic liquid with excellent stability over time. Seventhly, it is an object to provide an antistatic liquid that does not contain a large amount of organic solvent. Eighth, intensifying screen staining (when a surfactant is applied to an intensifying screen, it penetrates from the surface of the intensifying screen protective layer to the inside of the protective layer and even to the fluorescent layer, and is present in the protective layer and fluorescent layer. The purpose of the present invention is to provide an antistatic liquid that does not interact with substances and cause an intensifying screen to turn yellow after long-term use. These objects of the present invention include at least one surfactant represented by the following general formula (), a surfactant represented by the following general formula (), and a fluorinated hydrocarbon interface represented by the following general formula (). In an antistatic cleaning liquid containing at least one surfactant selected from active agents, a surfactant represented by the general formula () and/or a fluorinated hydrocarbon interface represented by the general formula () A charging method characterized in that the weight ratio of the surfactant represented by the general formula () to the active agent is 5/95 to 50/50, and the surfactant concentration in the cleaning liquid is 0.5 to 5.0% by weight. Achieved by preventive cleaning fluid. General formula () However, a, b and c represent integers, and a+c=
4 to 160, b=10 to 45. General formula () However, R and R ₁ represent an aliphatic hydrocarbon group having 3 to 12 carbon atoms, A represents an aliphatic hydrocarbon group having 3 to 5 carbon atoms, and M represents a hydrogen atom, an alkali metal atom, or a quaternary ammonium group. General formula () R _F -A-X However, R _F represents a partially or fully fluorinated hydrocarbon containing at least three fluorine atoms, and A is a chemical bond or a divalent aliphatic hydrocarbon. , represents an aromatic or mixed aliphatic-aromatic group, including those interrupted by a heteroatom of an oxygen atom, an ester group or an amide group. X is (-CH ₂ CH ₂ O) _o R ₃
(Here, R ₃ represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, n represents an integer of 5 to 20,
This polyoxyethylene group may be interrupted by one or more isopropyleneoxy groups), (Here, Alk represents a lower alkylene group having 1 to 5 carbon atoms, and R ₄ represents a lower alkyl group having 1 to 5 carbon atoms), -SO ₃ M, -OSO ₃ M or -
COOM (here, M has the same meaning as M in general formula ()). The weight ratio of the surfactant represented by the general formula () to the surfactant represented by the general formula () and/or the fluorinated surfactant represented by the general formula () is from 5/95 to 50/50. is particularly preferably from 10/90 to 30/70. That is, it is preferable that 70 to 90% of the total weight of the surfactant be the surfactant represented by the general formula (). Further, the total weight of the surfactant in the antistatic cleaning liquid of the present invention is 0.5 to 5.0%, particularly 1.0 to 5.0%.
Preferably it is 3.0%. In the general formula (), M is preferably an alkali metal atom, particularly sodium or potassium. In the general formula (), when A is interrupted by a heteroatom, the ester group is -COO-,
Examples of _the amide group include _-CONR2- and _-SO2NR2- (wherein _R2 represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms). Next, typical examples of compounds used in the present invention are shown. Examples of compounds represented by the general formula - Examples of compounds represented by the general formula - Specific examples of fluorinated hydrocarbon surfactants Most of these compounds are commercially available and are convenient to use. Examples of commercially available products of the general formula - include Pluronic L-44 (manufactured by Asahi Denka Kogyo). Examples of the general formula - include compounds described in Japanese Patent Publication No. 52-25250 among sulfonic acid surfactants. Examples of commercially available fluorinated hydrocarbon surfactants include Megafuac F-110 (Dainippon Ink). A characteristic feature of the antistatic liquid of the present invention is that it exhibits its antistatic effect regardless of the type of X-ray film to be used. X-ray film uses various additives in its surface layer to satisfy various performance requirements, and the reality is that the surface condition differs greatly between each X-ray film manufacturer and each X-ray film type. . For this reason, when these films are subjected to friction or peeling from the intensifying screen, it is thought that the charging properties vary greatly depending on the film. However, surprisingly, the antistatic liquid of the present invention exhibited excellent antistatic effects regardless of the type of film. This effect is produced as a result of the synergistic effect of mixing two or more types of surfactants, which is a feature of the present invention. In other words, by mixing two or more types of surfactants, both power generation performance and leakage performance (which can be evaluated by surface resistivity measurement), which are two causes of electrostatic failure, were significantly improved. This is a feature not found in other antistatic liquids. Furthermore, when many types of surfactants are mixed, repellency, unevenness, and foaming are often observed during application due to differences in their compatibility, surface orientation, etc. The mixed system of two or more types of surfactants of the present invention is free from such troubles and is characterized by being able to be applied extremely cleanly and uniformly. The antistatic liquid 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 failures occur, such as the rollers of the conveyance system. 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. Example 1 [1] Evaluation method of antistatic liquid 1-1) Antistatic property test Hi Screen Standard (Kasei Optonics Co., Ltd.) Protective layer polyethylene terephthalate (PET)...hereinafter referred to as screen A Hi Screen Standard (Kasei Optonics Co., Ltd.) )Protective layer DAC)…Screen B below
LT- (Kasei Optonics Co., Ltd. protective layer)
DAC)...Three types of intensifying screens, hereinafter referred to as screen C, were coated with various antistatic liquids (3% by weight).
Aqueous solution) was soaked in 1 c.c. of gauze and applied, left at room temperature, and dried for 2 hours. Then 25℃,
After adjusting the humidity to 25% RH for 3 hours, the surface resistivity was measured. To measure the surface resistivity, a test piece of an intensifying screen coated with an antistatic liquid is held between Machiyu electrodes (the part in contact with the test piece is made of stainless steel) with an electrode spacing of 0.14 cm and a length of 10 cm. The 1-minute value was measured using a meter (TR-8651). (The smaller the value of surface resistivity, the greater the antistatic effect.) The static mark generation test uses the sample prepared for the antistatic property test, and an unexposed X-ray film is placed on the surface coated with antistatic liquid. The X-ray film is then rubbed with a rubber roller and then taken out from between the interspersed sheets and developed. In this case, if the static mark did not occur at all, it was evaluated as ○, if it occurred partially, it was evaluated as △, and if it occurred all over the area, it was evaluated as ×. 1-2) Power generation test After applying various antistatic liquids to the screens A, B, and C using the method described above, heat the screens at 25℃ and 25%.
Humidify in a RH room for 3 hours. At this time, X-ray films [[Fuji X-ray Film; RX (NIF)] manufactured by Fuji Photo Film Co., Ltd. (Film-A) and [EK. )] Manufactured by Easman Kodatsu Co., Ltd. (Film-B) is also humidity-controlled in the same way. The power generation test method is 2 with a diameter of 10 cm and a length of 10 cm.
Cut a 7cm wide screen coated with antistatic liquid and paste it on the book roller, then press the free roller against the drive roller using two 2kg spring tensioners. Next, rotate the rollers at a speed of 20 m/min, cut the X-ray film you previously selected as the target material into pieces of 2 cm x 25 cm, insert them between the rotating rollers, and squeeze them out. The received X-ray film is received in a Faraday cage (330PF),
Measure the amount of charge (coulombs) at this time using a Takeda Riken insulation meter (TR-8651). 1-3) Retention test on intensifying screen Apply various antistatic liquids to Hi Screen Standard in the same manner as above. 3 to 25℃, 25%RH
After adjusting the humidity for a period of time, the surface resistivity was measured, and then the test piece was rubbed with a flannelette on one side 10 times, and the surface resistivity was measured again, and the degree of deterioration of the surface resistivity was judged. [2] Antistatic liquids shown in the following formulations [] to [] and comparative examples were prepared.

【table】

[Table] As described above, the antistatic liquid of the present invention exhibits excellent power generation prevention performance and high retention properties. Regarding the formulations (invention), there were no problems with regard to photographic properties, intensifying screen staining, and stability of the liquid over time.

Claims (1)

[Scope of Claims] 1 At least one surfactant represented by the following general formula (), a surfactant represented by the following general formula (), and a fluorinated hydrocarbon interface represented by the following general formula () In an antistatic cleaning liquid containing at least one surfactant selected from active agents, a surfactant represented by the general formula () and/or a fluorinated hydrocarbon interface represented by the general formula () The weight ratio of the surfactant represented by the general formula () to the active agent is 5/95 to 50/
50, and the surfactant concentration in the cleaning solution is
An antistatic cleaning liquid characterized by having a content of 0.5 to 5.0% by weight. General formula () However, a, b and c represent integers and a+c=4
b=10 to 160, and b=10 to 45. General formula () However, R and R ₁ represent an aliphatic hydrocarbon group having 3 to 12 carbon atoms, A represents an aliphatic hydrocarbon group having 3 to 5 carbon atoms, and M represents a hydrogen atom, an alkali metal atom, or a quaternary ammonium group. General formula () R _F -A-X However, R _F represents a partially or fully fluorinated hydrocarbon containing at least three fluorine atoms, and A is a chemical bond or a divalent aliphatic hydrocarbon. , represents an aromatic or mixed aliphatic-aromatic group, including those interrupted by a heteroatom of an oxygen atom, an ester group or an amide group. X is (-CH ₂ CH ₂ O) _o R ₃
(Here, R ₃ represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, n represents an integer of 5 to 20,
This polyoxyethylene group may be interrupted by one or more isopropyleneoxy groups), (Here, Alk represents a lower alkylene group having 1 to 5 carbon atoms, and R ₄ represents a lower alkyl group having 1 to 5 carbon atoms), -SO ₃ M, -OSO ₃ M or -
Represents COOM (here M is M in the general formula ()
(expresses the same meaning as ).