JPS6023096A - Cover film for color hard copying paper - Google Patents

Abstract

PURPOSE:To provide the titled film with which a colorless transparent protective film can be easily provided on a color-printed surface, wherein a resin layer only a heated part of which can be easily welded to the surface of a copying paper and released from the base is provided on the base. CONSTITUTION:A thin film B of a resin not adhesive to the heat-resistant base A such as a polyester film, e.g., a cellulose acetate resin, is provided on the surface of the base A, or the surface of the base A is subjected to a releasing treatment. Thereafter, a resin layer C in which a sublimable dye or the like is diffused or sorbed and only a heated part of which can be easily welded to the surface of a copying paper and released from the base A to form a transparent protective layer, is provided thereon to produce the objective cover film. A porous foamed material, a resin having dispersed therein a powder of a resin having high transparency and a distinct melting point or softening point, a paraffin wax or the like is preferably used for forming the resin layer C. EFFECT:The cover film can be supplied as a connected body, and operating efficiency is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a transferable color hard copy print rl! that can easily form a colorless and transparent protective layer on the surface of color printed photographic paper! This invention relates to a cover film for lI paper.

To explain in more detail, it is a cover film whose purpose is to protect a color image formed by transfer dyeing from a transfer paper made using a sublimation dye to a photographic paper and to develop the color of the dye.
Although it is formed as a continuous layer on the base material, it is possible to form a protective layer for the image by melting and transferring the resin only in arbitrary parts by heat-pressing from the base material side using a thermal head etc.
The remainder relates to a cover film for color pigeon copy photographic paper that can be easily removed together with the base material.

Transfer paper coated with ink using sublimable dye is heated using a thermal head to sublimate the dye in the necessary areas, forming a color image on the photographic paper, but the resulting image has the following characteristics: There were some problems. Although the sublimation-dyed dye is adsorbed onto the surface of the photographic paper, it is not sufficiently diffused, and some of the dye remains as aggregates, so that the original color development of the dye is not obstructed. For this reason, it was necessary to heat the print again after printing to thermally diffuse the dye. Furthermore, dyes that have been dyed have the disadvantage that they are easily discolored by, for example, oils transferred from hands, and are also easily discolored by ultraviolet rays contained in natural light. In order to solve this drawback, a method of heat-pressing a protective film with a thin heat-adhesive layer on the surface of a polyester film or the like was considered, but color copies made by forming these protective films cannot be pressure-bonded. Due to the expansion and contraction of the protective film due to the heat of the process, the product curled significantly and had to be handled in a form that was cut to the same size as the photographic paper. As a result of our analysis, in order to form a protective layer with less curling, it is preferable that the thickness of each resin layer is 20 μm or more.If the protective layer is thicker than this, the curling will be large and the product value will be greatly reduced, and it is also possible to form a clean and uniform protective layer. In order to form a protective layer, a resin layer of at least 1 μm or more was required. However, there are many difficulties in heat-pressing such a thin film onto a color copy without causing wrinkles.

In order to solve the above-mentioned problem, the present inventors first formed a heat-resistant base material and a heat-resistant base layer on the heat-resistant base material, and the "C" did not have adhesion to the heat-resistant base material, and when heated, it was formed on the photographic paper surface. We have proposed a transferable cover film that can be melt-transferred to form a colorless and transparent protective layer.With this transferable cover film, a protective layer with less curling can be easily formed on photographic paper.
However, the cover layer to be transferred is a continuous piece and cannot be easily cut, so after cutting it in advance, set it on the photographic paper, being careful not to let it protrude to the side, and then pass it through a laminator and heat it. It was necessary to fuse and then peel off only the heat resistant substrate to form the protective j-. Therefore, it was not possible to feed the cover film in its continuous form to a laminator and transfer only the necessary portions to form a protective layer on the photographic paper. This complicates the process of forming a protective layer on the photographic paper, and also causes dust to get caught up in the process of handling, or the heat roll for the laminator to be soiled if the front and back sides are turned incorrectly. A cover film that can be transferred onto photographic paper to form a protective layer rather than a heat-resistant base material has been desired.

The present invention solves these problems and prints a thickness of 1 on a color copy.
The object of the present invention is to provide a continuous supply type cover film that can form a colorless and transparent protective layer with less curl of ~20 μm only in necessary areas. .

That is, the present invention involves forming a thin resin film that does not adhere to the base material on one side of a heat-resistant base material, or applying a mold release treatment to the heat-resistant base material surface in advance, and then applying sublimation thereon. This is a cover film for sublimation transfer type Color HaF coffee photographic paper, in which the dye is diffused and adsorbed, and only the heated part is easily melted and transferred to the surface of the ink paper, forming a resin layer that can be peeled off from the base material. be.

Next, the present invention will be explained with reference to the drawings. Figure 1↑,
FIG. 6 is a structural diagram of a transferable cover film according to the present invention.

Figure 1 shows a resin layer (C) that becomes a transparent protective layer formed on a heat-resistant base material (A) through a resin thin film (B) that has no adhesive properties with the base material (A).
) is applied.

Figure 2 shows Table 11t after the peeling treatment of the heat-resistant base material (A).
This is a case in which a resin layer (C) is applied to i.

FIG. 3 shows a case in which a resin layer (D) serving as a transparent protective layer is deposited on a heat-resistant base material (A) via a resin thin film (B).

FIG. 4 shows a case in which a resin layer (D) is adhered to the peel-treated surface of a heat-resistant base material (A).

Figure 5 shows the heat-resistant base material (A) II! ! This is a case in which a resin M (E), which becomes a transparent insulation layer, is applied via a thin resin film (B).

FIG. 6 shows a case in which resin 11 (E) is adhered to the peel-treated surface of the heat-resistant base material (A).

The heat-resistant base material (A) is polyester, polycarbonate,
Polyarylate, polyester sulfone, polyimide, polyamide, polyamideimide, polyfluoroethylene, etc. with smooth surface or as required.
Pear background treatment, peeling treatment, AJ.

The base material is a relatively heat-resistant plastic film base material that has been subjected to a metallization surface treatment such as Zn or Cu, and the above-mentioned base materials are bonded to each other with paper, metal foil, etc. as necessary. The thickness of the base material (A) is 5 to looμ, preferably 8 to 50μ
This is selected in consideration of ease of handling, ease of welding during heating, etc.

The resin thin film (B) shown in Figures 1, 3, and 5 does not adhere to the heat-resistant substrate and is relatively hard, so when the cover layer is melt-transferred onto the photographic paper, it can be easily melted and transferred with a relatively weak force. It consists of a thin film of resin that can be destroyed but easily melts when heated. Examples of these resins include cellulose acetate resin, methyl methacrylate resin, epoxy resin, styrene resin, and gelatin, which themselves are crystalline, hard and brittle, or have a sharp melting point depending on temperature. Heat-resistant substrates are limited to those that do not have adhesive properties.

Transparent inorganic particles, fine resin powder, and low-molecular-weight polymers with a melting point are dispersed in these resins to make them brittle and easy to cut, and to sharpen their melting properties against temperature.
ζ is also good.

The resin layer (C) in FIGS. 1 and 2 is a porous foam layer made of transparent resin capable of diffusing and adsorbing sublimation dye. Such porous foams can be cooled by heating a foaming agent uniformly dispersed in the resin or by rapidly drying a solvent with a low boiling point. Also included in this range are brittle resin layers in which the solubility is intentionally reduced during coating film formation by cooling due to the latent heat of vaporization during drying or by mixing with a solvent, resulting in a whitening phenomenon. The tree JJ was born like this! [('C) is sensitive to heat and pressure, and instantly melts and transfers only the heated part to form a transparent protection 1-, but the unheated part remains on the base material side. The resin used here is generally transparent, adsorbs and diffuses sublimable dyes well, and is not particularly limited as long as it has adhesive properties with the processing agent on the surface of the photographic paper, but examples include polyester resin, epoxy resin, Examples include styrene resin, a mixture of epoxy resin and acrylic resin. Further, in order to increase the sensitivity to heat, dispersing or dissolving a low molecular weight substance having a low melting point, such as a crystalline polyester low molecular weight substance, an epoxy low molecular weight substance, a styrene low molecular weight substance, etc., will be particularly effective.

Resin J1 (D) in FIGS. 3 and 4 consists of a dispersed layer of transparent crystalline powder particles capable of diffusing and absorbing sublimation dyes. For example, this resin layer (D) contains 20 to 90% by weight of resin powders with distinct melting and softening points, such as polyester resins, polystyrene resins, epoxy resins, their low polymer modified rosins, and low molecular weight substances such as terpene phenols. Consisting of a dispersed resin layer, only the heated and pressurized portion easily separates from the melting heat-resistant base material, and can be formed as a transparent protective layer on photographic paper.

The resin layer (E) in Figures 5 and 6 is a transparent uniform tree made of compatible resins that do not have a temperature-sensitive melting point or softening point. Only the part heated by the thermal head easily melts, and the skewer that melts into the photographic paper (transfers and protects it onto the photographic paper)
can be formed. Examples of resins used for this purpose include paraffin wax, microcrystalline wax, carnauba wax, beeswax, chlorinated paraffin petroleum resin, and low-molecular polyethylene. Add oil such as linseed oil or mineral oil,
The heat-sensitive transfer resin layer is also made by adding transparent inorganic powder to make it easier to cut.

According to such a cover film for color hard copy photographic paper, only the portion of the resin 1- heated by the thermal head melts and transfers to the surface of the photographic paper to form a transparent protective layer, and the remaining resin layer is not cut.゛ζCan be easily separated from the base material. Therefore, since the C cover film can be supplied as a connected body and only the necessary portions can be transferred onto the surface of the printing paper to form a protective layer, the work efficiency of forming the protective layer on the photographic paper is improved.

Next, the present invention will be explained by examples.

Comparative Example (1) An internally plasticized polyester resin (Vylon #200, manufactured by Toyobo Co., Ltd.) was applied to the surface of a 25μ polyester film, one side of which had been released with a silicone release agent, to a dry thickness of 7μ to form a transfer cover film. Obtained. On the other hand, an image was formed by sublimating the dye onto photographic paper using a thermal head from the back side of a heat-sublimable ink ribbon produced by printing ink containing a sublimable dye onto thin paper. A transfer force/-, 1- film was placed on this photographic paper, and only the image forming area was heated with a thermal head from the back of the cover film, forming a protective layer on the image area on the photographic paper and completing the coloring of the dye. . After that, I tried to peel off the transfer cover film from the photographic paper, but the cover film could not be peeled off cleanly from the heated area, and it peeled off including the unheated area, or the photographic paper processing layer or paper was destroyed along with the image. Ta.

Comparative Example (2) A transfer cover in which a cellulose acetate propionate resin layer of about 3 μm was formed on the surface of a 25 μm polyester film, and then a layer of about 3 μm of the internally plasticized polyester resin described above was further formed thereon. created a film. Place this cover film on the photographic paper image prepared in step 11 (Comparative Example), and
Only the I image portion was heated and melted to form a protective layer. After that, an attempt was made to peel the transfer cover film from the photographic paper to remove the base film and the excess cover resin layer, but Comparative Example f
As in case 1), the cover resin j- was not cut well and the treated layer of the photographic paper was destroyed.

Example (1) A toluene solution of methyl methacrylate resin was coated on one side of a 12μ polyester soil so that the dry coating film had a thickness of 1μ. A resin solution consisting of a mixture of M F, K of polyester resin with a Tg of 67°C, acetone, and methanol was applied on top of this, and a whitened resin layer of about 10μ was formed by forced boiling drying on the tatara at a temperature of 100°C or higher. Ta. This melt transfer force/zl-film was placed on the previously prepared photographic paper, and heated from the back of the film using a thermal head set at 170°C only for the image area to melt the whitened resin layer and then print. When the cover film was peeled off from the paper, only the portion heated by the thermal head was transferred to the photographic paper side, and the remaining cover resin layer was easily peeled off from the photographic paper together with the base polyester film. The melt-transferred cover layer was sufficiently transparent and the dye was sufficiently colored.

Example (2) A whitened polyester resin layer of about 10 μm was formed on the surface of a 12 μm polyester film that had been subjected to a peeling treatment in the same manner as in Example (1). A protective layer is formed on the photographic paper using a thermal head using the same method, and when it is peeled off, a transparent polyester resin cover is formed only in the image area of the photographic paper, and the remaining resin is easily peeled off along with the base polyester film. done.

Example (3) ■ After forming a cellulose acetate resin layer of about 1μ on a 2μ polyester film, a polyester resin layer with a melting point of 123°C (Vylon #300 manufactured by Toyobo Co., Ltd.), a chlorinated paraffin fine powder, and a softening point were added. An aqueous dispersion of rosin ester powder (manufactured by Arayo Kagaku Kogyo Co., Ltd.) at 80° C. in a ratio of 6:3:1 was coated to a dry thickness of 10μ and dried.

This is done in the same way as the comparative example ゛ζζ stamp paper i! After fusing only the III image area, the transfer cover film was peeled off from the photographic paper, and a transparent protective layer was formed only in the image area, and the rest could be peeled off together with the base material.

Example (4) 20 parts of finely powdered silica on one side of a 6μ polyimide film,
While melting and kneading 20 parts of carnauba wax, 45 parts of ester wax, 10 parts of mineral oil, and 5 parts of antioxidant, approximately 7μ
It was applied to a thickness of . Photographic paper was lathered on the transfer cover film prepared in this manner, and the front surface of the image area was heated from the polyimide side with a thermal head at 300° C. for 10 rnsec to fuse the resin onto the printing paper.

Thereafter, when the cover film was peeled off from the photographic paper, it was easily peeled off, and a transparent and glossy protective layer could be formed on the image.

Example (5) 70 parts of chlorinated paraffin (Enbara 70, manufactured by Ajinomoto Co., Ltd.) with a softening point of 100"C and a polyester resin (Vylon #200, manufactured by Toyo Co., Ltd.) with a softening point of 163"C were applied to one side of a 12μ polyester film that had been subjected to a peeling treatment. (manufactured by Bosekisha) 20 copies,
9 parts of plasticizer DOP, oleic acid? Dissolve 1 part of Cyto (Diamid 0/200, manufactured by Nippon Kasei Co., Ltd.) in MEK.
ζThe resulting resin liquid was applied to a dry thickness of 5 μm. This cover film and already im by transfer of sublimable dye
The photographic paper with the image formed thereon was combined and pressed using a hot press set at 180°C. After taking it out from the press,
When the cover film and photographic paper were peeled off, only the press part was transferred neatly to the photographic paper side, forming a transparent protective layer, and the rest could be easily peeled off along with the base material. .

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 6 are cross-sectional views showing embodiments of the cover film according to the present invention. (A) is a heat-resistant base material, (B)' is a resin lacquer, and (C) is a heat-resistant base material. (D) and (E) are resin layers each serving as a protective layer.

Claims (1)

[Claims] For color pigeon copy photographic paper consisting of a heat-resistant base material and a resin layer that is peeled off and formed on the base material so that only the heated portion melts and transfers to the surface of the photographic paper and can be peeled off from the base material. cover film.