JPH03114051A - Image receiving sheet element - Google Patents

Abstract

PURPOSE:To reduce the amt. of UV reaching an image receiving layer through a cover sheet and to prevent the deterioration of transferring performance during storage over a long period of time by incorporating a UV absorber into the cover sheet or forming a layer contg. the UV absorber on the cover sheet. CONSTITUTION:A UV absorber is incorporated into a cover sheet or a layer contg. the UV absorber is formed on the cover sheet. For example, a polyethylene terephthalate film is coated with a coating soln. and dried to form an image receiving layer of 28mum thickness and a polyethylene cover sheet of 30mum thickness contg. 1% 'Tinuvin 900(R)' as a UV absorber is laminated on the image receiving layer to produce an image receiving sheet element. The amt. of UV reaching the image receiving layer through the cover sheet is reduced and the deterioration of transferring performance during storage over a long period of time can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to an image-receiving sheet element used primarily in the preparation of color proofs for color proofing.

``Prior art'' A photosensitive laminate comprising a temporary support and a release layer made of an organic polymer and a photosensitive resin layer is exposed and developed to form an image on the release layer, and then an image is formed on the release layer. The method of transferring to the body is known and is described in Japanese Patent Publications Nos. 46-15326 and 49-44.
It is stated in No. 1 etc. These methods have the advantage of being able to be used as color proofs for both overlay prints and sub-print types, but the process is complicated as adhesive is used each time, and each color must be transferred. This method has the disadvantage that the accuracy of the actual positioning is difficult.

As a method to eliminate the complexity of these processes, a method has been proposed in Japanese Patent Application Laid-Open No. 47-1981 in which, after forming an image, the image is brought into close contact with an image-receiving sheet, and the image is transferred onto the image-receiving sheet by applying heat and pressure.
No. 41830, No. 48-93337, No. 51-510
It is stated in No. 1. In particular, JP-A-51-5101 describes a method of providing a heat-meltable polymer layer as an adhesive on a permanent support, and JP-A-47-418
No. 30 also describes a method for transferring images directly to a permanent support such as art paper or coated paper.

However, these methods have the following drawbacks. One is that the final image will be left and right with respect to the original, and the other is that when heat-melting polymers are used, their melting point is generally high and the transfer temperature is high, so the heat will cause the support to The dimensional stability of the image is poor, and misalignment of the transfer of each color may occur.Also, when a polymer with a low melting point is used, adhesion after the image form is likely to occur. , it has drawbacks such as being easily scratched. Japanese Patent Application Publication No. 5
No. 9-97140 describes a method for improving the above drawbacks and 1.
Before transferring the images of each color onto the permanent support in step 2, the images of each color are first transferred to an image-receiving sheet provided with a photopolymerizable image-receiving layer 11, and then retransferred onto the permanent support. 17,
Furthermore, a method of hardening the photopolymerizable image-receiving layer by full-surface exposure is disclosed.

This method produces a normal image on the mask original, and since it contains an ethylenic polyfunctional monomer, the photopolymerizable image-receiving layer itself is soft and can be transferred at a low temperature. Afterwards, the photopolymerizable image-receiving layer is hardened by exposure to light, so that it has good adhesion and is resistant to scratches, and the defects and α mentioned above are almost eliminated.

However, when conventional cover sheets were used, the transfer performance deteriorated if the image-receiving sheet was exposed to ultraviolet light during long-term storage. An object of the present invention is to reduce the amount of ultraviolet rays that reach the image-receiving layer through the cover sheet, thereby preventing deterioration of transfer performance during long-term storage.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an image receiving sheet element comprising an image receiving layer provided on a flexible support and a removable cover sheet, the cover sheet being coated with ultraviolet #i The invention was achieved by an image-receiving sheet element characterized by internally adding an absorbing agent and/or providing a layer containing an ultraviolet absorber.

Below, the image receiving sheet element of the present invention will be explained in detail.

The image-receiving layer of the image-receiving sheet element of the present invention and the image-receiving layer 1. Any known material may be used as long as it has the desired properties. In particular, in order to increase the strength of the image film after the image is transferred, an image-receiving layer that is photopolymerizable and can be cured by exposure to light (hereinafter referred to as a photopolymerizable image-receiving layer) is useful. It is. Another effect of imparting photopolymerizability is that the image transferred to the image-receiving layer is a reverse image, so it is preferable to ultimately retransfer it to white paper such as that used for printing. Since the image-receiving layer cured by exposure generally has weak adhesion to the support, it has the advantage that the image-receiving layer can be easily peeled off from the support when retransferred to white paper. here"
The expression "photopolymerizable" means that upon irradiation with ultraviolet rays, the molecular weight of at least one portion of the photosensitive layer changes in the rheological and thermal behavior of the exposed portion.1. It means a system that increases enough to

A photopolymerizable image-receiving layer suitable for the present invention comprises (a) a polyfunctional vinyl or vinylidene compound capable of forming a photopolymer by addition polymerization, (b) an organic polymeric binder, and ( e) A photopolymerization initiator that is activated by actinic rays, and optionally contains a thermal polymerization inhibitor.

Suitable vinyl monomers or vinylidene compounds for use in the present invention are, for example, unsaturated esters of polyols, particularly preferably esters of acrylic acid or methacrylic acid, specific examples being ethylene glycol diacrylate, glycerin triacrylate, etc. Acrylate, polyacrylate, ethylene glycol dimethacrylate, 1,3-
Propanediol dimethacrylate, polyethylene glycol dimethacrylate, 1,2,4-butanetriol trimethacrylate, trimethylolethane triacrylate, pentaerythritol dimethacrylate, pentaerythritol trimethacrylate, pentaerythritol tetramethacrylate, pentaerythritol diacrylate , pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol polyacrylate, 1,3-brobanol diacrylate), 1,5-pentanediolne methacrylate, with a molecular weight in the range of 200-400. Bis-acrylates or bis-methacrylates of polyethylene glycol and similar compounds; unsaturated amides, especially those whose alkylene chains may be interrupted by oxygen atoms a,
These include, but are not limited to, unsaturated amides of acrylic or methacrylic acid with ω-diamines and ethylene bis-methacrylamide.

As the photopolymerization initiator, those with low absorption in the visible region are more preferable, such as benzophenone, Michler's ketone [4,4'-bis(dimethylamino)benzo7]
Aromatic ketones such as 4,4'-bis(diethylamino)benzophenone, 4-7toxy4'-dimethylaminobenzophenone, 2-ethylanthraquinone, 7enanthraquinone, and other aromatic ketones. ; benzoin ethers such as benzoin, benzoin methyl ether, benzoin ethyl ether and benzoin phenyl ether; methylbenzoin, ethylbenzoin and other benzoins; and 2-(O
-chlorophenyl)-4゜5-diphenylimiguzol difi, 2-(0-chlorophenyl)-4,5-(
m-methoxyphenyl) imiguzole dimer, 2-(o
-fluoro7 enyl) 4 y 5-diphenylimitasol dimer, 2-(0-methoxyphenyl)-4
, 5-diphenylimiguzole dimer, 2-(p-methoxyphenyl)-4,5-nophenylimitasol dif
iL form, 294-di(p-methoxyphenyl)-5-phenylimigsol dimer, 2-(2t4-dimethoxyphenyl)-4,5-diphenylimigsol dimer,
2-(p-Methylmercaptophenyl)-4,5-diphenylimiguzole dimer and U.S. Patent $3,479
, No. 185, No. 3.784,557, British Patent No. 1,0
2, as described in each specification of No. 47,569,
Examples include, but are not limited to, 4,5- and 7-aryl imiguzole dimers.

As the organic polymer binder, vinyl-based polymeric substances are particularly preferred from the viewpoint of thermoplasticity to obtain good image transferability and compatibility with the above-mentioned monomer compound and photopolymerization initiator.
Examples of vinyl polymer substances include polyvinyl chloride, polyacrylic acid, polymethyl acrylate, polyethyl acrylate, polybutyl acrylate, polymethacrylic acid, polymethyl methacrylate, polyvinyl ether, polyvinyl acetal, and these. Various examples include, but are not limited to, copolymers of.

Here, the appropriate mixing ratio of the monomer compound and the organic polymer binder (baingu) varies depending on the combination of the monomer compound and the organic polymer binder used, but - within the shell, the monomer: baingu Ratio is 1=10~2
:1 (weight ratio), and in this case, the amount of photopolymerization initiator added is preferably in the range of 0.01 to 20% by weight based on the weight of the monomer compound used.

As a thermal polymerization inhibitor, for example, p-methoxy 7E/
Mention may be made, however, of , but not limited to these.

The thickness of the photopolymerizable image-receiving layer should be at least enough to embed and transfer the four-color images from the image-forming material.The coating amount of the photopolymerizable image-receiving layer varies depending on the film thickness of the color image, but ranges from 4g/II'' to 40g/
Theory 2 is preferable. Regarding such a photopolymerizable image-receiving layer, reference may be made to the description in JP-A-59-97140.

Also useful is a two-layered image-receiving layer disclosed in JP-A-61-189535. For details, the description in the same publication can be referred to.

A cover sheet is provided over the image-receiving layer. Cover Sea F is a highly dimensional polymer with a high degree of dimensional stability.
A wide variety of sheet materials can be chosen, such as polyamides, polyolefins, polyesters, vinyl polymers and cellulose esters. The thickness of the cover sheet is 6 μm or more, preferably 200 μm or less.

Particularly good cover sheet 1i, 6-200/Me 11
．． , preferably polyethylene with a thickness of 20 to 50 μm.

In the present invention, an ultraviolet absorber is internally added to the cover sheet, and/or a layer containing a 1i zero dead line absorber is provided.

For ultraviolet absorber and 1-, using various commercially available bare thorns,
For example, Ciba Geigy's polymer additive machining catalog (1
(published on July 1, 1985).

As the material for the support (i:), a substance that is chemically and thermally stable and has complementary properties is used.

If necessary, chemical light transmittance "C' 7) may be applied. Specifically, Ii, polyolefins such as polyethylene and polypropylene, polyvinyl halides such as polyvinyl chloride and polyvinylidene chloride, cellulose, Acetate, nitrocellulose, cellulose derivatives such as Kamiguchi-1, polyamides, polystyrene, polycarbonate,
Sheets of polyimides and laminates thereof are preferred.

Particularly preferred among these is a 2-strength polyethylene film with dimensional stability, transparency, and odor of 11 degrees, and a film that prevents the generation of static electricity during use. In this case, it is preferable to impart conductivity to this support by coating it with a conductive material or kneading it with a conductive substance.
jl, $: For the purpose of increasing the adhesive strength with electrical waste, Corona Bi
The surface treatments such as surface treatment, glow discharge treatment, surface matte treatment (11'), and ultraviolet irradiation are repeated, as well as the provision of an Anguko-1 layer.

Further, fine particles or the like may be kneaded into the support for the purpose of matting the surface. Thickness of support (length 50-300
μ is excessively small, preferably 75=150
It is about μ-.

The step of transferring the image formed on the image forming material to the image receiving sheet according to the present invention, the process of transferring the image formed on the image forming material to the image receiving sheet, and permanently supporting the images transferred onto the image receiving sheet, such as art paper or coated paper. A known method is used for the step of retransferring onto the body. For example, the method described in JP-A-59-97140 can be applied.

Hereinafter, the present invention will be explained in detail with reference to examples, but the present invention is not limited thereto.
m) A coating liquid having the following composition was applied and dried to form an image-receiving layer with a dry film thickness of 28 μm, and on top of that an image-receiving layer containing 1% of Tinuvin 900 (manufactured by Ciba Geigy) as an ultraviolet absorber. An image receiving sheet element was prepared by laminating a 30 μm polyethylene cover sheet.

Methyl methacrylate polymer 9Og (average molecular weight 1ooooo, manufactured by Wako Pure Chemical Industries, Ltd.) Talltetra with pentaerythracite 90g Acrylate Michfouz Ketone 0.51g Penzofe/N 3゜18g Buffmethoxy 7E/
-ru 0.09g methyl ethyl ketone
220g On the other hand, an image forming material in which a release layer and a photosensitive resin layer were provided on a support was prepared as described in r.

Polyethylene terephthalate film (thickness = 100
A coating solution having the following composition was applied and dried on μ11) to provide a release layer having a dry film thickness of 0°5 μ−.

Alcohol-soluble polyamide 7.2g (CM-
Polyhydroxystyrene 1°8B (resin M1 average molecular weight: 5°500, manufactured by Maruzen Oil Co., Ltd.) 8000, 20°C, η = 23 eps in a 10 wt% methanol solution (manufactured by Tsunashiku Co., Ltd.) 400 g of methanol (manufactured by Maruzen Oil Co., Ltd.) 100 g of methyl cellosolve Peeling tIs, on the layer are four types of M (Y, M
, C, B) and dried to obtain yellow (Y), magenta<M), cyan (C), and black (
B) colored photosensitive U (with a dry film thickness of 2.4 μm)
A fat layer was provided.

Furthermore, a coating solution with the following composition was applied and dried on each of the photosensitive resin scraps to form a protective layer with a dry film thickness of 1.5 μm, and four types of images of Y, M, C, and B were formed. Forming materials (negative/positive) were manufactured.

Polyvinyl alcohol 60g (GL-
05, Nippon Gosei Kagaku Kogyo Co., Ltd. 1i) Water
970g methanol 30g
For the above four types of image forming materials, corresponding negative masks were positioned and overlapped using register bins, and exposed to a 2 km ultra-high pressure mercury lamp from a distance of 950 cu. Thereafter, each exposed transfer sheet was developed for 15 seconds at 35°C using a developer having the following composition to form a positive image on the release layer of each transfer sheet, and four types (four colors) were developed. Color proofing sheets were obtained.

Na 2 CO
1 5 B-butyl cellosolve
1g water
11 Next, the cover sheet is peeled off from the image-receiving sheet element, and the image-forming material with the black image is precisely superimposed on the image-receiving sheet using a register bin so that it is in contact with the image-receiving layer of the image-receiving sheet. Earth Laminator 8B-550-80
, manufactured by Taisei Shoji Co., Ltd.) under the conditions of pressure 2 pearl, roller temperature 120°C, and conveyance speed 900 mm for 1 minute. 1 By peeling off the support of the image forming material, a black image was formed on the image receiving sheet. The same operation was repeated for the obtained image forming materials of 0 and the remaining three colors to obtain an image receiving sheet to which black, cyan, magenta, and yellow images were transferred.

Using the image-receiving sheet having the four-color transfer image described above, a color test sheet for the sub-print method was prepared as follows.

An image-receiving sheet having transferred images of four colors was stacked on white art paper so that the image-receiving layer sides were in contact with each other, and this was sandwiched between an aluminum plate and a polyethylene terephthalate film, and lamination was performed under the same conditions as described above.

Next, when the support of this image-receiving sheet and the white art paper were peeled off, peeling occurred at the interface between the support of the image-receiving sheet and the image-receiving layer, and an image very similar to the printed matter was obtained.

The above operation was performed using an image receiving sheet stored in a dark place and an image receiving sheet element left open on a windowsill exposed to direct sunlight for 30 days, and the transfer properties were compared.

In the image-receiving sheet element of the present invention in which the cover sheet contained an ultraviolet absorber, there was substantially no deterioration in transferability.

On the other hand, if an image-receiving sheet element whose cover sheet does not contain an ultraviolet absorber is used, sufficient transfer will not occur;
There were small air bubbles and the finish was uneven in 9 images.

Example 2 As an image receiving layer, coating liquids A and B having the following composition were sequentially applied to give a dry film thickness of 20 μm and 1.5 μm, respectively, and a receptor layer with an adhesive surface was prepared. An image receiving sheet was created.

Toketsu” Noyo Ethylene-vinyl acetate copolymer (Weight ratio: ethylene 81%.

Vinyl acetate 19%, "Evaflex #410" manufactured by Mitsui Polychemical Co., Ltd.) Chlorinated polyethylene (manufactured by Yamaba Kokusaku Valve Co., Ltd., Super Cumin 907 LTA'') Fluorine surfactant (manufactured by 3M, 170 Lard FC) -430") Toluene Arashike JLL Polyvinyl butyral (manufactured by Denki Kagaku Kogyo Co., Ltd., "$2000-L") Fluorine P, surfactant (manufactured by 3M, "70 Lard FC-430") 5g 0.075g 0 .25g 00e 0.05g Meta/-L 50ee Methyl ethyl ketone 20ee Methyl cellosolve acetate 20ee A 40 μm thick polyethylene cover sheet containing 1% Kumisorb 300 (manufactured by Sumitomo Chemical) was laminated thereon to form an image receiving sheet element. Created.

When the transferability was evaluated in the same manner as in Example 1, the same results as in Example 1 were obtained.

Claims (1)

[Claims] An image-receiving sheet element comprising an image-receiving layer provided on a flexible support and a removable cover sheet, wherein the cover sheet is internally loaded with an ultraviolet absorber and/or provided with a layer containing an ultraviolet absorber. An image receiving sheet element characterized by: