JP2618746B2 - Image receiving sheet material and transfer image forming method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image receiving sheet material mainly used for producing a color proof and a display for color proofing, and a method of forming a transferred image using the image receiving sheet material. Things.

`` Prior art '' A photosensitive laminate having a release layer made of an organic polymer and a photosensitive resin layer provided on a temporary support is exposed to light, and after an image is formed on the release layer by a development process, it is applied to any support. The method of transferring is known, and Japanese Patent Publication Nos. 46-15326 and 49-441,
-41830, 48-93337, and 51-5101.

Japanese Patent Application Laid-Open No. 61-189535 has two image receiving layers made of an organic polymer on a support, and the peeling force between the image receiving layers and the peeling force between the second layer and the image layers are adjusted. By
There is disclosed an image receiving sheet which can be arbitrarily selected to transfer only the image layer when transferring the image layer onto the permanent support, or to transfer the image layer and the second image receiving layer. In this case, in the image receiving sheet, the optical gain of the image can be adjusted by changing the presence or absence of the transfer of the second image receiving layer and the thickness of the transferred second image receiving layer.
In addition, the image receiving layer surface can reproduce the unevenness of the permanent support more faithfully due to the effect of the thin image receiving layer on the image, and a more natural matte effect can be obtained. There is known an image receiving sheet suitable for obtaining the following.

In the image receiving sheet, various kinds of organic polymer substances can be basically used as the organic polymer substance used for the second layer. However, polyamide which is a heat-adhesive material which can be applied with an alcohol-based coating solvent from the viewpoint of suitability for multilayer coating. It is described in Japanese Patent Application No. 1-65065 that polyvinyl butyral and the like are advantageous.

However, there is a problem that these adhesive materials such as polyamide and polyvinyl butyral have high hygroscopicity due to hydrophilicity, and various properties such as thermal adhesiveness and tackiness are changed by moisture absorption. Problems to be Solved "An object of the present invention is to improve the above-mentioned disadvantages. That is, after transferring the transferable image to the image receiving sheet material, when retransferring to a permanent support such as paper, a metal plate, a plastic film, or a cloth, a matting process is required by delamination of the image receiving layer. In a transfer image forming method in which a multi-color image having a high degree of similarity to printed matter can be obtained simply by peeling without giving a feeling of unevenness of the support, various properties such as heat adhesion and tackiness are not easily affected by humidity changes and are low. Provide image-receiving sheet materials that provide stable performance from humidity to high humidity,
Another object of the present invention is to provide a transfer image forming method using the image receiving sheet.

"Means for Solving the Problems" It is an object of the present invention to transfer an image formed on an image forming layer of a transferable photosensitive material to an image receiving sheet material, and then to reproduce the image on a permanent support. An image receiving sheet material used for forming a transferred image formed by transfer has an image receiving layer made of a composition containing a support and an organic polymer composed of at least two layers as a main component on the support. Wherein at least one of the image receiving layers is transferred onto a permanent support, and the image receiving layer transferred onto the permanent support is rosin;
An image receiving sheet material containing at least one resin selected from the group consisting of a rosin ester and an alicyclic saturated hydrocarbon resin, and a transfer image forming method using the image receiving sheet.

The support of the image receiving sheet is preferably chemically and thermally stable. Specifically, polyethylene terephthalate, polycarbonate, and optionally a paper laminated with a polyethylene film can also be used, but are not limited thereto. Not something. In order to increase the adhesive strength between the support and the first image receiving layer, a surface treatment such as a corona discharge treatment or a glow discharge treatment, or an undercoat layer may be provided. As the undercoat layer, any material can be used as long as it enhances the adhesive strength between the support and the first image receiving layer, but a silane coupling agent or the like is particularly preferable.

As the organic polymer substance used as the first layer, various substances can be used, but polyvinyl chloride, a copolymer of vinyl chloride and vinyl acetate, having a softening point of 150 ° C. or less and a molecular weight of 200 to 2,000, It is preferable to contain at least one selected from the group consisting of a copolymer of vinyl, vinyl acetate and vinyl alcohol, and a copolymer of vinyl chloride, vinyl acetate and maleic acid. The reason is that polyvinyl chloride and vinyl chloride copolymer have (1) almost no tackiness at room temperature. (2) The softening point is relatively low, around 70 ° C., so that it can easily follow irregularities of a transferred image during thermal transfer. (3) The plasticizer having good compatibility is abundant and the control of the substantial softening point is easy. (4) The interlayer adhesion is easily controlled by the effect of the hydroxyl group or carboxyl group in the copolymer component. And the like. Of course, it is also possible to add various polymers, adhesion improvers, surfactants or release agents to these organic polymers in order to adjust the adhesive strength between the image receiving sheet support and the image receiving second layer. . For the purpose of lowering the softening point, a partial combination of various tacky polymers is also very effective as long as tackiness at normal temperature does not occur.

The thickness of the organic polymer substance of the first layer is preferably 1 μm to 50 μm, particularly preferably 5 μm to 30 μm. One of the reasons is that when an image transferred on an image receiving sheet material is transferred to a permanent support, the image needs to be thicker than the irregularities on the surface of the permanent support. When the image is transferred to the image receiving sheet material, if the image area and the non-image area of the transferable image have irregularities, the color may be thin in the case of a single color. This is because when there is an overlap, it is preferable that the thickness be four times the thickness of the unevenness of the image portion and the non-image portion of each color.

Addition of organotin-based stabilizers such as butyltin-based stabilizer and octyltin-based stabilizer generally known as stabilizers (prevention of decomposition) of polyvinyl chloride and vinyl chloride copolymer, and organic metal liquid stabilizers It is possible to

Next, the image receiving second layer provided thereon will be described. The purpose of the second image receiving layer is to peel off the image receiving sheet material during retransfer to the permanent support, to delaminate between the first and second image receiving layers and to form a thin second layer on the image on the permanent support. An object of the present invention is to obtain an image similar to the gloss of an actual printed matter without applying a special matting process due to the unevenness of the permanent support, leaving only the unevenness.

The organic polymer substance used for the second layer is a heat-adhesive material that is hardly affected by changes in physical properties of the film due to moisture absorption,
Rosin that has low hydrophilicity and is soluble in alcoholic solvents, for the purpose of not impairing the suitability for multilayer coating with the layer,
It is preferable to contain at least one selected from the group consisting of rosin esters and alicyclic saturated hydrocarbon resins.

In addition, various substantially transparent resins can be mixed and used as long as compatibility with these resins is not impaired.
The mixing ratio can be appropriately determined by those skilled in the art while considering required properties such as film strength, film hardness, and film moisture absorption. Examples of such resins include phenolic resins, epoxy resins, urethane resins, urea resins, melamine resins, alkyd resins, maleic acid resins, hydroxystyrene copolymer resins, sulfonamide resins, ester gums, cellulose resins, shellac, etc. Examples thereof include natural resins, polyamides and polyvinyl butyral which are not affected by humidity and the like.

It is natural that other adhesion improvers, release agents, plasticizers, surfactants and the like can be added to these resins in order to satisfy the relationship of the adhesive force disclosed in JP-A-61-189535. . Further, a third image receiving layer may be provided on the second layer as one of means for adjusting film physical properties such as adhesiveness, thermal adhesion and film strength of the second image receiving layer.

Furthermore, it is also possible to impart photopolymerizability to the second and third layers of the image receiving layer and to photo-cur after transferring to the permanent support to further improve the adhesion resistance of the finished product. Photopolymerizable monomers and photoinitiators which can be used for such purposes are described in JP-A-59-9714.
0, JP-A-61-200535.

The thickness of the image receiving second layer is preferably about 0.1 μm to 10 μm, particularly preferably 0.5 μm to 5 μm. If the film thickness is too large, the unevenness of the surface of the permanent support is impaired, and the gloss becomes too high to deteriorate the print similarity. When two or more image receiving layers are transferred onto a permanent support, the total thickness is preferably in this range.

As the transferable image forming material used in the present invention, various image forming materials described in the above-mentioned patents described in the section of the prior art can be used, but those provided with a release layer on a support are preferred. Particularly preferred. The reason for this is that if there is no release layer, the image area itself must be transferred to a permanent support.However, in various experiments, there are restrictions such as a narrow range of material selection or a high heat transfer temperature. ,
When the release layer is provided, the functions can be separated, and there are advantages such as the latitude of the temperature and the type of material transferred to the permanent support.

In these release layers, the release layer in the non-image area is etched at the time of development during photographic image formation, and may be left only under the image area, or the release layer is not etched during the development. A color image may be formed on the release layer.

In order to cause delamination between the organic polymer substance of the first layer and the organic polymer substance of the second layer by peeling the image receiving sheet material at the time of transfer to the permanent support, it is important to balance the adhesive force between the respective layers. However, in addition to the selection of a coating solvent to prevent mixing during multilayer coating used in the present invention in controlling interlayer adhesion, in addition to materials such as a combination of a hydrophilic polymer and a lipophilic polymer or a combination of a polar polymer and a non-polar polymer. Selection, addition of an adhesion improver such as a silane coupling agent, various additives having a releasing effect of fluorine or silicone, a surfactant, a plasticizer, and the like may be added to the first image receiving layer or the second image receiving layer. It is valid.

Hereinafter, the present invention will be described with reference to examples, but the present invention is not limited thereto.

"Examples" Examples 1 to 3 and Comparative Example 1 First, a transferable image forming material was prepared in the following procedure. A release layer solution having the following composition was coated on a polyethylene terephthalate film support (thickness: 100 μm) and dried to form a release layer having a dry film thickness of 0.5 μm.

Coating solution for release layer Alcohol-soluble polyamide 7.2g (CM-8000, "η" 20 ℃ 10wt% methanol solution 23cps
Toray Co., Ltd. Polyhydroxystyrene 1.8 g (Resin M, average molecular weight: 5,500, manufactured by Maruzen Petroleum Co., Ltd.) Methanol 400 g Methyl cellosolve 100 g Then, on this release layer, the four types shown in Table 1 below ( (Y, M, C, B) are applied and dried, respectively, and the dried coating film colored yellow (Y), magenta (M), cyan (C), and black (B) has a photosensitive film of 2.4 μm. A conductive resin layer was provided.

Further, a coating solution having the following composition was applied on each photosensitive resin layer and dried to form a protective layer having a dry film thickness of 1.5 μm.

Coating solution for protective layer Polyvinyl alcohol 60g (GL-05, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) Water 970g Methanol 30g In this way, the four colors of the support, the release layer, the photosensitive resin layer, and the protective layer in this order. Photosensitive transfer sheet (N → P
Mold colored photosensitive sheet).

The photosensitive transfer sheet of each of the four colors is superimposed on the corresponding mask using a register pin, and the photosensitive transfer sheet is applied with a 2Kw ultrahigh pressure mercury lamp.
Image exposure was performed at a distance of 0 cm.

Thereafter, the exposed transfer sheet was developed with a developer having the following composition at a temperature of 35 ° C. for 10 to 20 seconds to obtain a four-color positive image on the release layer.

Developing solution Na2CO3 15 g Butyl cellosolve 1 g Water 1 On the other hand, an image receiving sheet material was prepared as follows. A polyethylene terephthalate film (thickness: 100 μm) is prepared, and a coating solution A having the following composition is applied and dried to a dry film thickness of 20 μm.
An image receiving first layer having a thickness of μm was formed.

Coating solution A Vinyl chloride / vinyl acetate copolymer 15 g (weight ratio: PVC 75%, vinyl acetate 25%, degree of polymerization: about 400, Nissin Chemical Co., Ltd. MPR-T5) Vinyl chloride / vinyl acetate / male Acid copolymer 5 g (weight ratio: 86% vinyl chloride, 13% vinyl acetate, 1% maleic acid, degree of polymerization: about 400, Nissin Chemical Co., Ltd. MPR-TM) Dibutyl phthalate 0.4 g Fluorine surfactant 0.25 g (3M Florad FC-430) methyl ethyl ketone 100 ml Next, a solution comprising the following various coating solutions B1 to B3 was applied on the first image receiving layer as the second image receiving layer of the present invention. It was formed to have a thickness of 2 μm. At the same time, a coating solution B4 was similarly applied as a comparative sample.

Coating solution B1 Hydrogenated rosin 2.0 g (Arakawa Chemical Industries, Ltd., KR-610) Styrene / maleic acid 1.0 g Half ester copolymer resin (Nippon Shokubai Co., Ltd., Oxylac SH-101) Methyl alcohol 70 ml Methyl cellosolve 30 ml Coating solution B2 Hydrogenated rosin 1.0g (Arakawa Chemical Industries, Ltd., KR-610) Hydrogenated rosin ester 1.0g (Arakawa Chemical Industries, Ltd., KE-311) Styrene / maleic acid 1.0g Half ester copolymer resin (Nippon Shokubai Co., Ltd., Oxylac SH-101) Methyl alcohol 70 ml Methyl cellosolve 30 ml Coating solution B3 Alicyclic saturated hydrocarbon resin 2.1 g (Arakawa Chemical Industries, Inc., Alcon M) -90) Styrene / maleic acid 0.9 g half ester copolymer resin (Nippon Shokubai Co., Ltd., Oxylac SH-101) Methyl alcohol 70 ml Methyl Ucellosolve 30 ml Coating solution B4 Alcohol-soluble nylon 1.5 g (Toray Industries, Inc.) Made Amilan “CM-8000”) Styrene / maleic acid 1.5 g half-ester copolymer resin (Nippon Shokubai Co., Ltd., Oxylac SH-101) Methyl alcohol 70 ml Methyl cellosolve 30 ml Obtained image receiving sheet of the present invention and comparison In the image receiving sheet, the respective image receiving surfaces and the image surface of the color proofing sheet on which the black image is formed are positioned by register pins and overlapped, and a color art transfer machine CA-
When the black image was transferred to the image receiving sheet by 600T (manufactured by Fuji Photo Film Co., Ltd.), the black image was completely transferred from the color proofing sheet to the image receiving sheet together with the release layer.

Next, when the same operation as described above was repeated using a color proofing sheet on which each image of cyan, magenta, and yellow was formed on the transferred black image, each color image was placed on the image receiving sheet together with a release layer. And a color image consisting of four colors was obtained.

Further, the image surface of the image receiving sheet having the transferred images of four colors obtained in this manner was superimposed on white art paper, and the same transfer as described above was carried out to peel off the support of the image receiving sheet. The above image transfer operation was performed at 1.24 ° C in a temperature and humidity environment.
The test was performed under two conditions of 24% RH 2.24 ° C. and 80% RH.

The following Table 2 shows the transferability of the image and the peeling force between the first and second image receiving layers.

The peeling force (interlayer adhesion) between the first and second image receiving layers was measured as follows.

Measurement conditions for measurement of delamination force 1. An image receiving layer of 6 × 16 cm ² was prepared as a measurement sample.

2. Measure the sample in an atmosphere of 20 ° C 20% RH (30 ° C 80% RH).
Conditioned for hours.

A 3.5 cm Mylar tape was stuck on the image receiving layer.

The measurement sample was cut again to 4.4.5 cm width.

5. Part of the image receiving layer at the end of the measurement sample is delaminated with Mylar tape.
Peeling speed 1500mm / min with G-2K type (SHIMPO Industrial Co., Ltd.)
And the strength was measured.

As is clear from Table 2, in the case of the image receiving second layer of the present invention, the influence of the moisture absorption of the film on the humidity change of the working environment is small, so that the humidity change of the thermal adhesiveness and the humidity change of the interlayer adhesion force are hardly caused. No stable image transferability was obtained.

Claims (2)

(57) [Claims] An image receiving sheet material used for forming a transfer image by transferring an image formed on an image forming layer of a transferable photosensitive material to an image receiving sheet material and then retransferring the image onto a permanent support. Wherein the image receiving sheet material has an image receiving layer comprising a support and a composition containing at least two layers of an organic high molecular polymer as a main component, wherein at least one of the image receiving layers is a permanent support The image receiving layer transferred onto a permanent support and containing at least one resin selected from the group consisting of rosin, rosin ester, and alicyclic saturated hydrocarbon resin. Sheet material. 2. A transfer image forming method comprising transferring an image formed on an image forming layer of a transferable photosensitive material to an image receiving sheet material and then retransferring the image onto a permanent support. The material has an image-receiving layer composed of a support and a composition containing, as a main component, at least two layers of an organic high-molecular polymer, and at least one of the image-receiving layers.
The layer is transferred onto a permanent support, and the image receiving layer transferred onto the permanent support contains at least one resin selected from the group consisting of rosin, rosin ester, and alicyclic saturated hydrocarbon resin. A transfer image forming method characterized by the above-mentioned.