JPH04239691A - Heat transfer image receiving paper - Google Patents

Abstract

PURPOSE:To obtain an image receiving paper of good quality for seal use by forming said paper of a sheet base material and a foamed sheet meeting a specific relationship between their thicknesses, the surface roughness of the foamed sheet being not below a specific value and the sheet base material being made of white plastic film. CONSTITUTION:A white plastic film is used as a sheet base material, polyester resin is preferable as material for use in this film and the biaxially stretched film is the most desirable. Polyester is an example of the resin material of the foamed sheet. The surface roughness Ra of the foamed sheet is required to be at least 0.2mum, preferably at least 0.3mum. The ratio of the thickness A of the sheet base material to the thickness B of the foamed sheet is appropriately 0.6-1.7 and a preferred value of 0.7-1.4. The sum A+B of their thicknesses is given an appropriate value of 50-400mum.

Description

[Detailed description of the invention]

0001

[Technical field] The present invention is used in combination with a transfer sheet having a transfer layer containing a sublimable or vaporizable dye, and has an image receiving layer to which the dye sublimated or vaporized by heating the transfer sheet is dyed. For more information on thermal transfer image receiving paper, please see
The present invention relates to an image-receiving paper whose support portion can be peeled off and the remaining image-receiving sheet portion can be attached to an article.

0002

[Prior art] Video cameras, still video cameras,
BACKGROUND OF THE INVENTION Methods of reproducing images in the form of hard copies such as photographs from electrical image signals obtained from televisions, video disks, photographic transmission devices, etc. are being actively researched. A thermal transfer image recording method is currently attracting attention as one of the promising methods. Thermal transfer image recording method is 4 to 1mm per mm.
An electric signal containing image information is sent to a thermal head with 16 dots of electric heating elements lined up in a row, and at the same time, a transfer sheet having a transfer layer containing a sublimable or vaporizable dye and an image receiving paper are superimposed and transferred. This is a method in which the sheet is heated with a thermal head to sublimate or vaporize the dye contained in the transfer layer and dye the image-receiving paper, thereby forming a dye image on the image-receiving paper.

[0003] Various configurations of image-receiving paper used in this thermal transfer image recording method have been proposed depending on the purpose. For example, there is an image-receiving paper used for sealing purposes, in which after an image is transferred to the image-receiving paper, the support portion is peeled off and the remaining image-receiving sheet is pasted as a sticker. Performances that should be provided as an image-receiving paper for this purpose include image quality, sensitivity, strength of the image-receiving sheet itself, curling properties, color misregistration prevention properties, and runnability within a printer. Although image-receiving papers with various configurations have been proposed in the past, it has been difficult to satisfy each of the above-mentioned performances. As a result of intensive studies to solve the above problems, the inventors of the present invention found that by using a specific layer structure as the structure of the image-receiving paper and setting the thickness, thickness ratio, surface roughness, etc. within a specific condition range. It was discovered that an image-receiving paper satisfying the above performance can be obtained, and the present invention was achieved.

That is, the object of the present invention is to improve image quality, sensitivity, intensity,
The object of the present invention is to provide an image-receiving paper for sealing purposes that has excellent curling properties, color misregistration prevention properties, and runnability and is of overall good quality.

[0005]

[Means for solving the problem] However, this purpose is
In an image-receiving paper essentially consisting of an image-receiving layer, a sheet base material, an adhesive layer, a release treatment layer, and a foamed sheet in order from the top,
The image-receiving paper is releasable between the image-receiving sheet portion consisting of the image-receiving layer, sheet base material, and adhesive layer and the support portion consisting of the release treatment layer and foam sheet, and the thickness of the sheet base material (A ) and the thickness of the foam sheet (B) is A≧30μ
m, A/B=0.6~1.7, A+B=50~400μ
This is achieved by an image-receiving paper for thermal transfer, which satisfies m, has a foamed sheet with a surface roughness Ra of 0.2 μm or more, and has a sheet base made of a white plastic film. Furthermore, it is preferable to use an image receiving paper in which the total coating amount of the adhesive layer and the release treatment layer is 15 g/m2 or less.

The present invention will be explained in detail below. A white plastic film is used as the sheet base material for the image-receiving sheet portion of the present invention, and the resin material thereof is preferably polyester such as polyethylene terephthalate (PET), and most preferably a biaxially stretched product. Other examples include polyolefins such as polypropylene, hard vinyl chloride, and the like. White pigments such as titanium oxide and calcium carbonate are kneaded into these resins to impart concealing properties.

[0007] The reasons for using a white plastic film, especially a biaxially stretched PET film, are its smoothness, concealability,
It has excellent strength. That is, since the smoothness is good, good image quality with small density unevenness and no roughness can be obtained. Moreover, since the strength is excellent, it is advantageous in the work of attaching an image-receiving sheet after peeling off the support portion. For example, if the image-receiving sheet itself is not strong enough, there is a problem that the sheet may tear if the image-receiving sheet itself is not strong enough if the image-receiving sheet itself is not strong enough to cause the image-receiving sheet to tear if the image-receiving sheet itself is not strong enough. Further, the thickness of the sheet base material needs to be 30 μm or more, preferably 50 μm or more. If the thickness is too thin, it will become stiff and cause problems in peeling and pasting work. Moreover, the strength will also be insufficient.

[0008] A foamed sheet is used as the base material of the support portion of the present invention, and examples of the resin material include polyesters such as polyethylene terephthalate, polyolefins such as polyethylene and polypropylene, polyvinyl chloride, styrene resins, polyamide resins, etc. can be mentioned. The bulk density of these foam sheets is preferably 0.6 to 1.2 g/cm2. In addition, the surface roughness Ra is 0.2μ to improve running performance in the printer device and prevent color misregistration.
m or more, preferably 0.3 μm or more.

The reason why foam sheets are used is that they have good thermal insulation properties, have good sensitivity, and are used in swing-mechanical printers, which are attracting attention because the platen roll can be made smaller and the printer can be made more compact. One point is that color shift can be prevented when used in That is,
If the printing mechanism of the printer is a swing type, Y, M,
When printing the three colors of C, the spikes of the capstan roll, which is the driving force for reciprocating the image receiving paper, are better bitten and caught, improving the precision of reciprocating movement and preventing color misregistration.

[0010] Furthermore, the ratio A/B of the thickness (A) of the sheet base material and the thickness (B) of the foam sheet that is the base material of the support portion is preferably in the range of 0.6 to 1.7. Preferably 0
．． A range of 7 to 1.4 is good. If the difference in thickness is too large and the thickness ratio is outside the above range, it will be difficult to control the curling properties after the two base materials are bonded together, making it difficult to obtain a flat product. In addition, the thickness of the sheet base material (A
) and the thickness of the foam sheet (B), the total thickness A + B is 50 ~
A suitable thickness is 400 μm. If this total thickness is too thin, the contact force of the thermal head during printing will be weak, resulting in blurred images, while if it is too thick, too much pressure will be applied, which will tend to deteriorate the running properties within the printer. be.

[0011] If necessary, a back surface treatment layer may be provided on the underside of the foam sheet that is the base material of the support portion. This is provided to further prevent set-off as an image-receiving paper, and to improve sheet feeding suitability, antistatic properties, and the like. What does set-off prevention mean here? When multiple sheets of printed image-receiving paper are stacked and stored, the image on the front side is transferred to the back side of the overlying image-receiving paper due to dye migration, reducing its commercial value. Refers to the ability to prevent the temperature from dropping. Examples of the synthetic resin used for the back surface treatment layer include polyvinyl alcohol resin, polyester resin, polycarbonate resin, polyacetal resin such as polyvinyl butyral, and resin having an amide bond such as polyamide resin. In addition to these resins, mixtures or copolymers thereof can also be used. In order to enhance the antistatic performance, an antistatic agent may be added to these resins.

Synthetic resins used for the image-receiving layer in the present invention include resins having ester bonds such as polyester resins, polyacrylic acid ester resins, polycarbonate resins, polyvinyl acetate resins, styrene acrylate resins, vinyl toluene acrylate resins, and polyurethane resins. resins with urethane bonds such as polyamide resins, resins with urea bonds such as urea resins, other styrene resins, polyvinyl chloride resins, vinyl chloride-vinyl acetate copolymer resins, polyacrylonitrile Examples include resin. In addition to these resins, mixtures or copolymers thereof can also be used.

In addition to the above-mentioned synthetic resin, a release agent, a pigment, etc. may be added to the image-receiving layer in the present invention. Examples of the mold release agent include solid waxes such as polyethylene wax, amide wax, and Teflon powder, fluorine-based and phosphate-based surfactants, and silicone oil. Among these mold release agents, silicone oil is most preferred. As the above-mentioned silicone oil, an oily one can also be used, but a hardened type is preferable. Examples of the curable silicone oil include reaction curable, photocurable, and catalytic curable silicone oils, with reaction curable silicone oils being particularly preferred. Examples of the reaction-curing silicone oil include amino-modified silicone oil, epoxy-modified silicone oil, and the like. The amount of the reactive silicone oil added to the image-receiving layer is preferably 0.1 to 20 wt%. As the pigment, extender pigments such as silica, calcium carbonate, titanium oxide, and zinc oxide are preferred. The thickness of the image receiving layer is 0.5~
20 μm is preferable, and 2 to 10 μm is more preferable.

Materials for the adhesive layer in the present invention include synthetic rubber, natural rubber, acrylic copolymers, polyacrylic esters, petroleum resins, and block copolymers such as SBR (styrene-butadiene rubber). It will be done. Moreover, an adhesive reinforcing agent, a plasticizer, a filler, etc. can be added to the above-mentioned adhesive as necessary. In addition, a release treatment layer is provided in order to improve the releasability between the image receiving sheet and the foamed sheet and to make it easier to use as a seal.

[0015] As the mold release treatment layer, silicone oil,
Fluorine-based or phosphate-based surfactants can be used. In the present invention, the total coating amount of the adhesive layer and the release treatment layer is preferably set to 15 g/m2 or less, more preferably 10 g/m2 or less. If it is too thick, the adhesive and release agent will protrude from the cutting edge and cause stains, reduce the workability of applying it as a sticker, and cause plastic deformation due to pressure during printing, which will cause density unevenness. I do things.

Next, the present invention will be explained in more detail with reference to specific examples, but the present invention is not limited thereto.

[0017]

[Example] Example 1 A dyeing liquid of the following composition was applied to a sheet base material made of a 100 μm thick white polyethylene terephthalate sheet (W400, manufactured by Diafoil Co., Ltd.) using a die coater to a solid content of approximately 5 g. / m2, apply it and dry it,
An image receiving sheet was obtained. Composition for forming image-receiving layer: 10 parts by weight of saturated polyester resin (TP-
220: Nippon Gosei Chemical Co., Ltd., amino-modified silicone 0.5 parts by weight (KF-393: Shin-Etsu Chemical Co., Ltd.) solvent
30 parts by weight (xylene/methyl ethyl ketone = 1/1) On the other hand, a foamed polyethylene terephthalate sheet with a thickness of 100 μm (manufactured by Diafoil Co., Ltd.,
A release treatment layer was formed by applying a thermosetting silicone oil commonly used for W-900E (Ra: 0.6 μm) in a coating amount of about 5 g/m 2 .

[0018] Furthermore, about 5 g/g of an adhesive having the following composition is added on top of it.
It was coated with a coating amount of m2. Composition for forming release treatment layer Acrylic adhesive 40 parts (manufactured by Toyo Ink Manufacturing Co., Ltd., BPS 4627-6S) Toluene
60 parts of the support were thus obtained.

Next, the two sheets were laminated so that the surface of the image-receiving sheet on which the image-receiving layer was not provided and the surface of the foamed sheet on which the adhesive layer was provided faced each other to obtain an image-receiving paper. The image-receiving paper thus obtained was excellent in image quality, curling properties, color misregistration prevention properties, workability for application as a sticker, etc. For printing, a movie printer manufactured by Matsushita Electric Industrial Co., Ltd. under the trade name MP-1 was used.

Comparative Example 1 An image-receiving paper was produced in the same manner as in Example 1 except that a white polyethylene terephthalate sheet of the same thickness was used instead of the foamed polyethylene terephthalate sheet as the mount. The resulting receiving paper had a problem of color shift of about 0.5 to 1 mm.

Comparative Example 2 Example 1 except that the thickness of the white polyethylene terephthalate sheet used as the sheet base material was changed to 50 μm.
Receiving paper was produced in the same manner as above. The resulting image-receiving paper had a problem of curling, especially when it was heated to about 40° C., it became not flat.

[0022]

Effects of the Invention The thermal transfer image receiving paper of the present invention uses a specific layer structure, and the thickness ratio of the sheet base material and the foamed sheet, the total thickness,
Since the thickness of the sheet base material and the surface roughness of the foam sheet are set to specific conditions, the image quality and sensitivity are good, and because it runs well in the printer, there is no color shift, and even when stored at high temperatures. It was possible to obtain image-receiving paper that satisfies the required performance of image-receiving paper, such as no curling.

Claims (1)

[Claims] Claim 1. An image-receiving paper essentially consisting of an image-receiving layer, a sheet base material, an adhesive layer, a release treatment layer, and a foamed sheet in order from the top, the image-receiving paper comprising: the image-receiving layer, the sheet base material, and the foamed sheet. Peeling is possible between the image receiving sheet part made of an adhesive layer and the support part made of a release treatment layer and a foamed sheet, and the thickness of the sheet base material (A) and the thickness of the foamed sheet (B)
The relationship is A≧30μm, A/B=0.6-1.7, A+
An image receiving paper for thermal transfer, characterized in that B=50 to 400 μm, the foam sheet has a surface roughness Ra of 0.2 μm or more, and the sheet base material is made of a white plastic film.