JP2000284098A - Radiation image conversion panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radiation image conversion panel of which scratch resistivity is improved. SOLUTION: A radiation image conversion panel having a fluorescent material layer consisting of photostimulable phosphor and protection film provided on it is characterized by that a protection film is constituted of a film forming resin layer containing polysiloxane oil containing perfuloroalkyl and is characterized by that the protection film is constituted of a transparent resin film and film forming resin layer containing polysiloxane oil containing perfuloroalkyl formed on it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiation image conversion panel used for a radiation image recording / reproducing method using a stimulable phosphor.

[0002]

2. Description of the Related Art A radiation image recording / reproducing method using a stimulable phosphor is known as an alternative to the conventional radiographic method. This method uses a radiation image conversion panel (a stimulable phosphor sheet) containing a stimulable phosphor, and transmits radiation transmitted through a subject or emitted from a subject to the stimulable phosphor of the panel. The radiation energy stored in the stimulable phosphor is absorbed by the body in a time-series manner by exciting the stimulable phosphor with electromagnetic waves (excitation light) such as visible light and infrared rays. The fluorescent light is emitted as (stimulated emission light), the fluorescence is read photoelectrically to obtain an electric signal, and a radiation image of a subject or a subject is reproduced as a visible image based on the obtained electric signal. After the reading, the panel is prepared for the next photographing after the remaining image is erased. That is, the radiation image conversion panel is used repeatedly.

According to this radiographic image recording / reproducing method, a radiographic image having a large amount of information can be obtained with a much smaller exposure dose than the conventional radiographic method using a combination of a radiographic film and an intensifying screen. There is an advantage that can be. Furthermore, in contrast to the conventional radiographic method, which consumes a radiographic film for each photographing operation, the radiographic image recording / reproducing method uses a radiographic image conversion panel repeatedly, so that resource conservation and economic efficiency are reduced. Is also advantageous.

A radiation image conversion panel used in a radiation image recording / reproducing method has a basic structure comprising a support and a stimulable phosphor layer provided thereon. However, when the stimulable phosphor layer is self-supporting, a support is not necessarily required. In addition, a protective film is usually provided on the upper surface of the stimulable phosphor layer (the surface not facing the support) to protect the phosphor layer from chemical deterioration or physical impact. ing.

The stimulable phosphor layer usually comprises a stimulable phosphor and a binder containing and supporting the stimulable phosphor in a dispersed state. However, there is also known a stimulable phosphor layer which does not include a binder formed by a vapor deposition method or a sintering method and is composed of only an aggregate of the stimulable phosphor. Further, there is known a radiation image conversion panel having a stimulable phosphor layer in which a polymer substance is impregnated in a gap between stimulable phosphor aggregates. In any of these phosphor layers, the stimulable phosphor is X
When irradiated with excitation light after absorbing radiation such as radiation, it has the property of stimulating luminescence, so radiation transmitted through a subject or emitted from a subject is proportional to the amount of radiation. Absorbed by the stimulable phosphor layer of the image conversion panel, a radiation image of the subject or the subject is formed on the panel as an accumulated image of radiation energy. This accumulated image can be emitted as stimulated emission light by irradiating the excitation light, and the accumulated image of radiation energy is imaged by photoelectrically reading the stimulated emission light and converting it into an electric signal. Can be realized.

Although the radiation image recording / reproducing method has many excellent advantages as described above, the radiation image conversion panel used in this method has the highest sensitivity and the highest image quality (sharpness). It is desired to provide an image having good image quality (degree, graininess, etc.).

[0007] On the surface of the stimulable phosphor layer of the radiation image conversion panel, a protective film made of a transparent resin material is usually provided to protect the phosphor layer as described above. The formed protective film generally has advantages in that it has a high adhesive strength to the phosphor layer and can be manufactured by a relatively simple process. However, on the other hand, in the implementation of the above-mentioned radiation image recording / reproducing method, the radiation image conversion panel is repeatedly used by being hung on a reading device having a conveying means such as a belt or a roller. Scratches occur on contact and dirt is likely to adhere. If scratches or dirt are generated on the surface of the protective film of the panel, irradiation of excitation light or extraction of stimulated emission light from the surface causes deterioration in the quality of the finally obtained radiation image. It is a big problem.

As a protective film capable of preventing the adhesion of dirt on the surface of the radiation image conversion panel and avoiding a decrease in sensitivity, for example, Japanese Patent Application Laid-Open No. 2-193100 discloses a coating film containing an organic solvent-soluble fluorine-based resin. Are described. JP-A-4-310900 describes a film formed from a coating film containing a film-forming resin and either a polysiloxane skeleton-containing oligomer or a perfluoroalkyl group-containing oligomer, or both. . According to these, it has been clarified that dirt does not easily adhere to the surface of the protective film, and that once dirt adheres, it is easily removed.

Although the above-mentioned radiation image conversion panel has prevented the problem of adhesion of dirt on the surface of the protective film, the result of preventing abrasion on the surface of the protective film has not been sufficiently satisfactory. Therefore, Japanese Patent Laid-Open No.
In Japanese Patent Publication No. 00, by providing a protective film composed of a plastic film having high hardness and a fluororesin coating layer,
It has been proposed to prevent scratches on the surface of the protective film and the adhesion of dirt.

[0010]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a radiation image conversion panel having even more excellent scratch resistance.

[0011]

The present inventor has studied the occurrence of abrasion on the surface of the protective film of the radiation image storage panel. As a result, the protective film was formed of a film-forming resin containing a perfluoroalkyl group-containing polysiloxane oil. By using a thin film or a transparent resin film and the thin film formed thereon, it has been found that the coefficient of friction on the surface of the protective film is remarkably reduced, and the occurrence of scratches can be further prevented.

The present invention relates to a radiation image conversion panel having a phosphor layer comprising a stimulable phosphor and a protective film provided thereon, wherein the protective film contains a perfluoroalkyl group-containing polysiloxane oil. A radiation image conversion panel comprising a forming resin. Alternatively, the present invention provides a radiation image conversion panel having a phosphor layer composed of a stimulable phosphor and a protective film provided thereon, wherein the protective film is formed of a transparent resin film and a perfluoro film formed thereon. There is also a radiation image conversion panel comprising a film-forming resin layer containing an alkyl group-containing polysiloxane oil.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the radiation image storage panel of the present invention will be described below. (1) A perfluoroalkyl group-containing polysiloxane oil is applied to the protective film (or the film-forming resin layer) in an amount of 0.01 to 10%.
A radiation image conversion panel contained in a range of 0.1% by weight, more preferably 0.1% to 3% by weight. (2) A radiation image conversion panel in which the perfluoroalkyl group-containing polysiloxane oil has a functional group, more preferably a hydroxyl group. (3) A radiation image conversion panel in which the film-forming resin is a resin composition containing a fluorine-based resin soluble in an organic solvent. (4) A radiation image conversion panel in which a protective film (or a film-forming resin layer) further contains white resin powder. (5) A radiation image conversion panel in which a protective film (or a film-forming resin layer) further contains a perfluoroalkyl group-containing oligomer. (6) A radiation image conversion panel in which the transparent resin film is a polyethylene terephthalate film.

Next, a method for manufacturing the radiation image storage panel of the present invention will be described in detail. The support can be arbitrarily selected from materials known as supports for conventional radiation image storage panels. In a known radiation image conversion panel,
In order to strengthen the bond between the support and the stimulable phosphor layer or to improve the sensitivity or image quality (sharpness, granularity) of the radiation image conversion panel, the surface of the support on which the phosphor layer is provided A polymer material such as gelatin is applied to the surface to form an adhesion-imparting layer, or a light-reflective layer made of a light-reflective material such as titanium dioxide or a light-absorbing layer made of a light-absorbing material such as carbon black It is known. The support used in the present invention can also be provided with these various layers, and the configuration thereof can be arbitrarily selected according to the desired purpose and application of the radiation image storage panel. Further, JP-A-58-
As described in JP-A-200200, in order to improve the sharpness of the obtained image, the surface of the support on the side of the phosphor layer (the surface of the support on the side of the phosphor layer is provided with an undercoat layer (adhesiveness imparting). (Layers), an auxiliary layer such as a light reflecting layer or a light absorbing layer may be provided on the surface of the auxiliary layer). In addition,
When the stimulable phosphor layer is self-supporting, it is not always necessary to use a support.

A phosphor layer having a particulate stimulable phosphor is provided on the support. The stimulable phosphor is preferably a stimulable phosphor that emits stimulable light in a wavelength range of 300 to 500 nm upon irradiation with excitation light having a wavelength in the range of 400 to 900 nm. Examples of such a stimulable phosphor are disclosed in JP-A-2-193100 and JP-A-4-3.
It is described in detail in JP-A-10900. Particularly preferred stimulable phosphors are alkaline earth metal halide phosphors activated by europium or cerium, and cerium activated rare earth oxyhalide phosphors. However, the stimulable phosphor used in the present invention is not limited to these phosphors, and emits stimulable light when irradiated with excitation light at any time after accumulating the irradiated radiation. Any phosphor can be used.

The case where the stimulable phosphor layer is composed of the stimulable phosphor and a binder containing and supporting the stimulable phosphor in a dispersed state will be described as an example. The phosphor layer can be formed on a support by, for example, the following known method. First, the stimulable phosphor particles and the binder are added to a solvent and mixed well to prepare a coating solution in which the stimulable phosphor particles are uniformly dispersed in the binder solution. Various types of resin materials are known for the binder that disperses and supports the phosphor particles, and in the production of the radiation image conversion panel of the present invention, any resin material centered on those known binder resins is used. Can be appropriately selected and used. The mixing ratio between the binder and the stimulable phosphor in the coating solution varies depending on the characteristics of the intended radiation image conversion panel, the type of the phosphor, and the like. Generally, the mixing ratio between the binder and the phosphor is 1%. : 1 to 1:10
0 (weight ratio), and particularly preferably in the range of 1: 8 to 1:40 (weight ratio). The coating solution further includes a dispersing agent for improving the dispersibility of the phosphor particles in the coating solution, and a dispersing agent for improving the binding force between the binder and the phosphor in the formed phosphor layer. Various additives such as a plasticizer, an anti-yellowing agent for preventing discoloration of the phosphor layer, a curing agent, and a crosslinking agent may be mixed.

Next, the coating solution thus prepared is
A coating film is formed by uniformly coating the surface of the support. The coating operation can be performed by a method using ordinary coating means, for example, a doctor blade, a roll coater, a knife coater, or the like. The coating is dried to complete the formation of the stimulable phosphor layer on the support. The layer thickness of the stimulable phosphor layer varies depending on the intended properties of the radiation image conversion panel, the type of phosphor, the mixing ratio of the binder to the phosphor, and the like. 5
The range is from 0 to 500 μm. Note that the phosphor layer does not necessarily need to be formed by directly applying the coating solution on the support as described above. For example, the coating solution is separately applied on a temporary support such as a glass plate, a metal plate, or a plastic sheet. After forming the phosphor layer by coating and drying, a method of pressing the phosphor layer on a support or bonding the phosphor layer on the support by using an adhesive may be used.

The stimulable phosphor layer of the radiation image storage panel of the present invention comprises not only a stimulable phosphor and a binder containing the stimulable phosphor in a dispersed state but also supporting the stimulable phosphor without a binder. It may be composed of only a stimulable phosphor aggregate or a phosphor layer in which a polymer substance is impregnated in a gap between the stimulable phosphor aggregates.

On this stimulable phosphor layer, a protective film comprising a film-forming resin containing a perfluoroalkyl group-containing polysiloxane oil, which is a characteristic feature of the radiation image storage panel of the present invention, is provided. . In the present invention, the perfluoroalkyl group-containing polysiloxane oil (silicone oil) is an oil having a polysiloxane skeleton having a perfluoroalkyl group (eg, trifluoropropyl group) at a side chain or a molecular terminal. The molecule preferably has at least one functional group (eg, a hydroxyl group). The molecular weight (weight average) is preferably in the range of 500 to 100,000, more preferably 1,000 to 100.
100,000, particularly preferably 3,000.
It is in the range of 0 to 10,000. Specific examples of the perfluoroalkyl group-containing polysiloxane oil include X-22-819 and X-22-82 manufactured by Shin-Etsu Silicone Co., Ltd.
0, X-22-821, X-22-822, FL10
0; FS1265 manufactured by Toray Silicone Co., Ltd .; and FQF501 manufactured by Toshiba Silicone Co., Ltd.

Examples of the film-forming resin used for forming the protective film include known protective films such as polyurethane resin, polyacrylic resin, cellulose resin, polymethacrylate resin, polyester resin, epoxy resin, and fluorine-based resin. Resins can be mentioned. Among these, particularly preferred are organic solvent-soluble fluororesins. The fluorine-based resin is a polymer of an olefin containing fluorine (fluoroolefin) or a copolymer containing a fluoroolefin as a copolymer component. Examples thereof include polytetrafluoroethylene, polychlorotrifluoroethylene, Examples thereof include polyvinyl fluoride, polyvinylidene fluoride, tetrafluoroethylene-hexafluoropropylene copolymer, and fluoroolefin-vinyl ether copolymer.

Fluorine-based resins are generally insoluble in organic solvents, but copolymers containing fluoroolefins as copolymer components are particularly soluble in organic solvents depending on other structural units (other than fluoroolefins) to be copolymerized. Therefore, such a solvent soluble in an organic solvent is selected, a solution prepared by dissolving the resin in an appropriate solvent is applied to the surface of the phosphor layer, and dried to easily form a protective film. it can. Representative examples of such an organic solvent-soluble fluorine-based resin include a fluoroolefin-vinyl ether copolymer, particularly a fluoroethylene-vinyl ether copolymer. Further, polytetrafluoroethylene and its modified product are soluble in a fluorine-based organic solvent such as a perfluorosolvent, and thus can be prepared and used as a solution in the same manner. These fluorine-based resins may be used in combination with another film-forming resin such as an epoxy resin. In this case, the fluorine-based resin is generally contained in the protective film in an amount of 30% by weight or more, preferably 50% by weight or more, particularly preferably 50% by weight or more. Preferably, the content is 70% by weight or more.

The protective film is formed by applying a solution prepared by dissolving (or dispersing) the above-mentioned perfluoroalkyl group-containing polysiloxane oil and a film-forming resin in an organic solvent onto the surface of the phosphor layer and drying. Form. The application of the solution can be performed using a general application means such as an extrusion coater, a slide coater, and a doctor coater. Note that the protective film and the phosphor layer can be simultaneously formed by simultaneous multi-layer coating. The perfluoroalkyl group-containing polysiloxane oil is generally contained in the protective film in the range of 0.01 to 10% by weight, preferably in the range of 0.1 to 3% by weight. The solution may further contain a crosslinking agent, a hardening agent, an anti-yellowing agent, and the like. In particular, when a fluorine-based resin is used, the addition of a crosslinking agent is preferable because the strength of the resin is increased and the durability as a protective film is increased. The thickness of the protective film is generally about 0.1 to 2
It is in the range of 0 μm.

Further, the protective film may contain a perfluoroalkyl group-containing oligomer. The oligomer containing a perfluoroalkyl group (eg, tetrafluoroethylene group) preferably has at least one functional group (eg, hydroxyl group) in the molecule. The molecular weight (weight average molecular weight) is preferably in the range of 500 to 100,000, more preferably in the range of 1,000 to 10,000, and particularly preferably in the range of 10,000 to 100,000.
00 range. Specific examples of the perfluoroalkyl group-containing oligomer include Megafac series manufactured by Dainippon Ink and Chemicals, particularly F-110 and F-116.
F-120, F-142D, F-144D, F-15
0, F-160, F-171, F-172, F-17
3, F-177, F-178A, F-178K, F-1
79, F-183, F-184, F-191, F-81
2: Surflon series manufactured by Asahi Glass Co., Ltd., especially S-38
1, S-383, S-393, SC-101, SC-1
05, KH-40; and FC series manufactured by Sumitomo 3M Limited, particularly FC-430 and FC-431.

By using a material in which a functional group is contained in the oligomer as described above, a cross-linking reaction occurs between the oligomer and the film-forming resin during the formation of the protective film, and the oligomer is converted into a film-forming resin. Since it is incorporated into the molecular structure, the oligomer is less likely to deviate, and the effect of its addition is maintained for a long period of time. This is advantageous for long-term repeated use of the radiation image conversion panel and cleaning operation of the protective film surface. Such an oligomer is present in the protective film in an amount of 0.0
It is preferably contained in the range of 1 to 10% by weight,
Particularly preferably, it is in the range of 0.1 to 3% by weight.

The protective film may contain a white resin powder for the purpose of reducing interference unevenness and improving the quality of a radiographic image. Examples of the white resin powder include benzoguanamine resin powder, melamine formaldehyde resin powder, cured acrylic resin powder, silicone resin powder, fluororesin powder, and polyester resin powder. These white resin powders have an average particle size of 0.1.
It is preferably in the range of 1 to 10 μm, particularly preferably in the range of 0.3 to 5 μm. Specific examples of the white resin powder include Nippon Shokubai Co., Ltd.
S, M30, S, S6, S12, also eposter MA
Series: MR-2G, MR-7G, manufactured by Soken Chemical Co., Ltd.
MP Series; Lubron L-2 manufactured by Daikin Industries, Ltd.
L-5, LD-1, LD-100; Toshiba Silicone Co., Ltd.
Tospearl XC99-A8808, Tospearl 12
0, 130, 145, 240; and P manufactured by Toyobo Co., Ltd.
The ETBEADS series can be mentioned. The white resin powder is preferably contained in the protective film in a range of 0.5 to 30% by weight, more preferably in a range of 2 to 20% by weight, and particularly preferably in a range of 5 to 15% by weight. It is.

In the present invention, the protective film may have a two-layer structure in which a thin film made of a film-forming resin containing the above-mentioned perfluoroalkyl group-containing polysiloxane oil is formed on a transparent resin film. Good. The light transmittance of the transparent resin film is preferably 80% or more, particularly preferably 90% or more in the wavelength range of 400 to 700 nm. The transparent resin film can be manufactured from any resin material having excellent transparency and strength. Among them, preferred resin materials are polyethylene terephthalate, polyethylene naphthalate, and aramid resin, and particularly preferably high transparency. It is polyethylene terephthalate because it can be obtained at low cost. The thickness of the transparent resin film is usually in the range of 1 to 20 μm, preferably in the range of 3 to 10 μm. In this case, the thickness of the thin film (layer) made of the film-forming resin containing the perfluoroalkyl group-containing polysiloxane oil is usually in the range of 0.1 to 20 μm.

Although the radiation image conversion panel of the present invention is obtained as described above, the configuration of the panel of the present invention may include various known variations. For example, for the purpose of improving the sharpness of the obtained image, at least one of the above-mentioned layers may be colored with a coloring agent that absorbs excitation light but does not absorb stimulating light (Japanese Patent Publication No. No. 59-23400).

[0028]

EXAMPLES Example 1 (1) Formation of Photostimulable Phosphor Layer Photostimulable phosphor: BaFBr0.8I0.2: 0.0001Eu2 ⁺ 600 g Binder: polyurethane resin (Desmolac 4125, Sumitomo Bayer Urethane) 15.8 g bisphenol A type epoxy resin 2.0 g

The material having the above composition was added to a mixed solvent of methyl ethyl ketone-toluene (1: 1, weight ratio) and dispersed with a propeller mixer to prepare a coating solution having a viscosity of 25 to 30 PS (25 ° C.). The coating solution was uniformly applied on a polyethylene terephthalate sheet with undercoat (support, thickness: 300 μm) using a doctor blade.
After drying at 0 ° C. for 15 minutes, a stimulable phosphor layer (layer thickness: 220 μm) was provided on the support.

(2) Formation of protective film Film-forming resin: Fluorine resin (fluoroolefin-vinyl ether copolymer, Lumiflon LF100, manufactured by Asahi Glass Co., Ltd.) 70 g Bisphenol A type epoxy resin 5.0 g Crosslinking agent: Isocyanate ( Desmodur Z4370, manufactured by Sumitomo Bayer Urethane Co., Ltd. 25 g Additive: Perfluoroalkyl group-containing polysiloxane oil (having a dimethylpolysiloxane skeleton and having a perfluoro group in the side chain, FL100-10,000 cst, Shin-Etsu Chemical 0.5 g

A coating solution was prepared by adding the material having the above composition to methyl ethyl ketone. This coating solution was applied to the surface of a 6 μm-thick polyethylene terephthalate film using a doctor blade, then heat-treated at 110 ° C. for 10 minutes, thermally cured, and dried to form a fluorine-based resin layer on the film. Next, after providing a polyester-based heat-sensitive adhesive layer on the surface of the film opposite to the fluorine-based resin layer, the film is superimposed on the surface of the stimulable phosphor layer with the adhesive layer side facing down. 20kg / at 100 ° C
A protective film comprising a transparent film and a fluororesin layer containing perfluoroalkyl group-containing polysiloxane oil (thickness: 10 μm) was formed on the phosphor layer by applying a pressure of ² cm ² . As described above, the radiation image storage panel of the present invention comprising the support, the stimulable phosphor layer and the protective film was manufactured.

Example 2 In Example 1, (2) when forming a protective film, 18 g of melamine resin powder (Eposter S6, manufactured by Nippon Shokubai Co., Ltd.) and a dispersant (Blenact AL-M) were added to the coating solution. AJI-NO-MOTO Co., Ltd.) was manufactured in the same manner as in Example 1 except that 0.3 g of the radiation image conversion panel of the present invention was added.

Example 3 In Example 1, (2) In forming a protective film, a perfluoroalkyl group-containing oligomer (MegaFac F-178A, manufactured by Dainippon Ink and Chemicals, Inc.) was further added to the coating solution. A radiation image conversion panel of the present invention was manufactured in the same manner as in Example 1 except that 0 g and 18 g of a fluororesin powder (Lubron L-2, manufactured by Daikin Industries, Ltd.) were added.

Example 4 In Example 1, (2) In the formation of the protective film, a coating solution was applied directly on the surface of the stimulable phosphor layer, and then heat-treated at 120 ° C. for 30 minutes for thermosetting. The radiation image conversion panel of the present invention was manufactured in the same manner as in Example 1 except that the protective film (thickness: 10 μm) made of a fluororesin containing perfluoroalkyl group-containing polysiloxane oil was formed by drying. did.

Comparative Example 1 A radiation image for comparison was prepared in the same manner as in Example 1 except that (2) a perfluoroalkyl group-containing polysiloxane oil was not used in forming the protective film. A conversion panel was manufactured.

Comparative Example 2 In Example 1, (2) in forming the protective film, a hydroxyl group-containing silicone oil (X-22-2809, manufactured by Shin-Etsu Chemical Co., Ltd.) was used instead of the perfluoroalkyl group-containing polysiloxane oil. A radiation image storage panel for comparison was manufactured in the same manner as in Example 1 except that 0.5 g was used.

[Evaluation of Performance of Radiation Image Conversion Panel] With respect to each of the obtained radiation image conversion panels, the coefficient of friction of the surface of the protective film was measured and a scratch resistance test was performed to evaluate the performance.

(1) Coefficient of Friction The radiation image conversion panel was cut into a square of 2 cm × 2 cm to obtain a measurement sample. This measurement sample was placed on a separately prepared polyethylene terephthalate sheet with the protective film side down, and a load was applied on the sample so as to be 100 g including the sample weight. A sample with a load is pulled at a speed of 4c.
m / min, pull along the sheet in the plane direction, temperature 2
The tensile force F (g) of a sample in a moving state at a speed of 4 cm / min under the conditions of 5 ° C. and 60% humidity was measured by using Tensilon (UTM-
11-20, manufactured by Toyo Baldwin Co., Ltd.). The value of tensile force F / load was calculated, and the value was taken as the coefficient of friction of the surface of the protective film of the sample.

(2) Scratch-proof test The radiation image conversion panel was cut into a rectangle of 25.2 cm × 30.3 cm to obtain a measurement sample. Next, a polyethylene terephthalate base sheet made of the same material as the support of the panel was prepared, and the measurement sample was placed on the base sheet with the protective film side down. In this state, the sample is
After reciprocating 10,000 times repeatedly to rub the protective film of the sample against the substrate sheet, the surface of the protective film of the sample was visually observed and evaluated according to the following criteria. A: Scratch scarcely occurred. B: Scratches were slightly generated, but there was no practical problem. C: A considerable amount of scratches occurred. D: The occurrence of scratches was remarkably large. Table 1 summarizes the obtained results.

[0040]

[Table 1] Table 1 係数 Coefficient of friction Scratch resistance ──────────── {Example 1 0.32 A2 0.47 A3 0.28 A4 0.35 B} ────────────── Comparative Example 1 0.80 D 2 0.55 C ──────────────────────── ───

As is apparent from the results in Table 1, none of the radiation image conversion panels (Examples 1 to 4) in which the protective film according to the present invention contains a perfluoroalkyl group-containing polysiloxane oil (Examples 1 to 4). Compared with the radiation image conversion panel (Comparative Example 1) and the known radiation image conversion panel containing a slipping agent (Comparative Example 2), the coefficient of friction was extremely low, and high scratch resistance was exhibited. In particular, when a protective film composed of a transparent resin film and a fluorine-based resin layer containing the above compound was provided, the scratch resistance was excellent.

[0042]

According to the present invention, the protective film of the radiation image storage panel is made to contain a perfluoroalkyl group-containing polysiloxane oil, so that the coefficient of friction on the surface of the protective film is remarkably reduced, and the generation of scratches is reduced. It can be effectively prevented. In particular, by using a fluorine-based resin as the film-forming resin, it is possible to enhance the anti-scratch property and at the same time avoid the attachment of dirt, thereby obtaining a high-quality radiation image.

Claims (13)

[Claims] 1. A radiation image conversion panel having a phosphor layer comprising a stimulable phosphor and a protective film provided thereon, wherein said protective film comprises a perfluoroalkyl group-containing polysiloxane oil. A radiation image conversion panel comprising a resin. 2. The radiation image conversion panel according to claim 1, wherein the perfluoroalkyl group-containing polysiloxane oil is contained in the protective film in a range of 0.01 to 10% by weight. 3. The radiation image conversion panel according to claim 2, wherein the perfluoroalkyl group-containing polysiloxane oil is contained in the protective film in a range of 0.1 to 3% by weight. 4. The radiation image conversion panel according to claim 1, wherein the film-forming resin is a resin composition containing a fluorine-based resin soluble in an organic solvent. 5. The radiation image conversion panel according to claim 1, wherein the protective film further contains a white resin powder. 6. The radiation image storage panel according to claim 1, wherein the protective film further contains a perfluoroalkyl group-containing oligomer. 7. A radiation image conversion panel having a phosphor layer composed of a stimulable phosphor and a protective film provided thereon, wherein said protective film is formed of a transparent resin film and a perfluoro film formed thereon. A radiation image conversion panel comprising a film-forming resin layer containing an alkyl group-containing polysiloxane oil. 8. The radiation image conversion panel according to claim 7, wherein the perfluoroalkyl group-containing polysiloxane oil is contained in the film-forming resin layer in an amount of 0.01 to 10% by weight. 9. The radiation image storage panel according to claim 8, wherein the perfluoroalkyl group-containing polysiloxane oil is contained in the film-forming resin layer in an amount of 0.1 to 3% by weight. 10. The radiation image conversion panel according to claim 7, wherein the film-forming resin is a resin composition containing a fluorine-based resin soluble in an organic solvent. 11. The radiation image storage panel according to claim 7, wherein the film-forming resin layer further contains white resin powder. 12. The film-forming resin layer further contains a perfluoroalkyl group-containing oligomer.
The radiation image conversion panel according to any one of the first to third aspects. 13. The radiation image conversion panel according to claim 7, wherein the transparent resin film is a polyethylene terephthalate film.