JPH03126583A - Accepting body for sublimable thermo-transfer recording - Google Patents

Abstract

PURPOSE:To form an image with a high density and a high resolving power by a method wherein a substrate is formed by applying a resin coating on a surface of pulp paper made of a cellulose fiber having a specific fiber diameter with a specific coating amount and pressing the coated pulp paper under a specific condition. CONSTITUTION:The title accepting body is mainly composed of pulp paper containing 70-100wt.% chemical pulp. The cellulose fiber forming the chemical pulp is selected out of ultrafine fibers ranging 0.5-9mum in fiber diameter. To improve the ink absorption capacity of the pulp paper and to prevent the occurrence of hicky and bleeding in an image, a resin coating is applied on the surface of the pulp paper with the coating amount of 10-40g/m<2>. As said resin coating, a material containing a synthetic resin, such as acrylic acid resin and vinylchloride resin, and a synthetic wax, such as polyethylene wax and paraffin wax, is preferable, and particularly a material containing 0.5-80wt.% acrylic acid resin and 0.05-50wt.% polyethylene wax is preferable. Furthermore, to enhance the smoothness of the pulp paper, the pulp paper is pressed by a calender roll under the condition of a 130-180 deg.C roll temperature and a 100-150kg/cm<2> pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a sublimation type printing method in which an image is formed by subliming and transferring the sublimable dye from a transfer body provided with a transfer layer containing the sublimable dye by heating. This invention relates to a thermal transfer recording receptor.

[Prior Art] The sublimation thermal transfer recording method enables color recording with high gradation reproducibility by sublimating and transferring a plurality of types of dyes having different sublimation temperatures and hues by changing the heating temperature. There is a strong need for multicolor gradation reproduction when making hard copies from still images on TV screens or images on computer graphics screens, and this method, which has a high transfer speed, small size, and low cost, is extremely useful for this purpose. suitable.

This method, which is particularly rich in gradation, will have many applications in the future, and is expected to be widely used not only for industrial purposes but also for home use, as information media and decorative items.

BACKGROUND ART Conventionally, a receptor used for sublimation type thermal transfer recording is constructed by providing a receiving layer on the surface of a base material, the main component of which is a synthetic resin that can be dyed with a sublimable dye. The base material used is plastic film, paper, or paper laminated with plastic film.

[Problems to be Solved by the Invention] However, receptors based on plastic film or paper laminated with a plastic film are generally expensive, and the plastic film shrinks due to heat during transfer, causing the transfer image to change. There was a problem that the surface easily became uneven.

In addition, paper-based receptors do not have the risk of heat shrinkage, but
The fiber diameter of the cellulose fibers that make up the paper is 10 to 20 μm.
Since the unevenness of the paper fibers is reflected on the sublimable dye receiving layer, there is a problem in that ink transfer failure occurs and the transferred image becomes rough. If pressing is performed in an attempt to eliminate these irregularities and impart smoothness, there is a problem in that the ink absorption ability decreases and transferability deteriorates.

The purpose of the present invention is to provide a high-quality image that has excellent heat resistance, does not shrink due to heat during transfer, does not cause unevenness on the surface of the transferred image, has high whiteness, and also has good ink transfer and no white spots or bleeding in the image. An object of the present invention is to provide a sublimation type thermal transfer recording receptor capable of forming a high-density, high-resolution image.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a base material, and a sublimation dye dyeing resin and a curing agent for this resin or a crosslinking agent for this resin on the surface of this base material. A sublimation type, in which the sublimable dye is sublimated and transferred by heating from a transfer body provided with a transfer layer containing a sublimable dye to form an image. In the thermal transfer recording receptor, the base material is a pulp paper made of 70 to 100% by weight of chemical pulp and cellulose fibers with a fiber diameter of 0.5 to 9 μm, and a resin coating is applied in a coating amount of 10 to 40 g/m2 on the surface of the pulp paper. Coating and roll temperature 130-180℃, pressure 100-150k
It is characterized by being made by pressing at a pressure of 1.5 g/cm.

This will be explained in detail below.

The base material of the present invention is mainly composed of pulp paper containing 70 to 100% by weight of chemical pulp. Since it is mainly composed of pulp paper, all coloring substances such as lignin, pitch, and carbohydrate decomposition products and substances that absorb ultraviolet rays are removed, resulting in extremely glossy and high whiteness. The cellulose fibers that make up this chemical pulp have a fiber diameter of 0.5 to 9.
Selected from ultrafine fibers in the μm range. Fiber diameter is 9μ
m, the drawbacks of conventional paper receptors become apparent. Further, in order to increase the ink absorbing power of this pulp paper and prevent white spots and blurring of images, a resin paint is applied to the surface of the pulp paper at a coating amount of 10 to 40 g/kg. This resin coating preferably contains synthetic resins such as acrylic acid resins and vinyl chloride resins, and synthetic waxes such as polyethylene wax and paraffin wax, particularly those containing 0.5 to 80% by weight of acrylic acid resin and 0.05 to 80% by weight of acrylic acid resin. Those containing 50% by weight polyethylene wax are preferred. Coating amount is 10g
If it is less than 7 m2, the ink absorption capacity of the pulp paper will not be sufficient, and if it exceeds 40 g/m'', cracking, folding, etc. will occur, so the coating is carried out within the above range.

In order to further improve the smoothness of the pulp paper, the roll temperature is 13
Pressing is performed using a calender roll under the conditions of 0 to 180°C and a pressure of 100 to 150 kg/eta'.

Roll temperature is less than 130℃, pressure is 100kg/c
If it is less than m', the pulp paper will not have sufficient smoothness, the roll temperature will exceed 180°C, and the pressure will be 150 kg/cm'.
If it exceeds this range, unevenness will occur, so pressing is performed within the above range.

The pulp paper of the present invention has a thickness of 50 μm to 500 μm depending on the use.
It is selected from a range of approximately μm.

The sublimable dye dyeable resin contained in the receptor layer provided on the surface of the base material has an affinity for sublimable dyes and has a softening temperature of 1.
A temperature of 25°C or higher is selected. Examples of such synthetic resins include vinyl chloride resin, vinylidene chloride resin, fluororesin, vinylidene fluoride resin, vinyl acetate resin, polystyrene resin, methacrylic acid resin, acrylic acid resin, polyethylene resin, and ethylene vinyl acetate resin. Examples include polymers, polyamide resins, polyvinyl acetal resins, polycarbonate resins, saturated polyester resins, polyarylate resins, polysulfone resins, and the like. Examples of thermosetting resins include phenol resins, melamine resins, alkyd resins, unsaturated polyester resins, epoxy resins, and polyurethane resins. The above synthetic resin may be used alone or in combination.
More than one species can be used in combination.

The curing agent for the sublimation dye-staining resin or the crosslinking agent for this resin is selected from those compatible with the sublimation dye-staining resin, such as polyisocyanate, amino acids, epoxy resins, melamine resins, etc. For resins that are cured by electron beams or electron beams, ultraviolet absorbers and electron beam absorbers can also be used.

The above-mentioned receptor layer is provided by further coating on the resin coating surface of the pulp paper.

[Effects of the invention] As mentioned above, conventional receivers made of a base material mainly composed of plastic film had the problem of heat shrinkage during transfer, but the receiver of the present invention has a base material made of pulp paper. Because it is the main component, there is no heat shrinkage during transfer, and since this pulp paper is coated with resin paint and heat-pressed, the sublimable dye on the transfer material is transferred to the receiver at high concentration and resolution. It has many excellent effects such as eliminating white spots and bleeding in transferred images.

[Example] Next, the present invention will be explained in detail.

First, a chemical pulp of 100% by weight made of cellulose fibers with a fiber diameter of 0.5 to 9 μm and a thickness of 130. High-quality pulp paper of czm was selected, and the resin paint shown below was applied to the surface of this pulp paper in a coating amount of 20 g/m2.

・Acrylic acid resin aqueous solution Brimer WS-32 (Japan Acrylic Chemical 1tJ)
50m/to polyethylene wax aqueous dispersion°-Marine PN (Sanyo Chemical (…)
20 m° water
30 m After applying the above resin paint, roll temperature is 150℃ and pressure is 120 kg/cm2 using a calendar roll.
was pressed to obtain a base material.

Next, a receptive layer coating solution having the composition shown below was further applied onto the resin coating surface to provide a receptive layer of 10 g/m'.

・Polyester resin UE-3210 (Unitika ■)
12.0g/Crosslinking agent polyisocyanate bamboo) D-11ON (Soken Yakuhin Kogyo ■)
0.6g・Silicone surfactant KF-351 (Shin-Etsu Chemical ■) 0.5g・Silicone white resin fine powder X-52-590 (Shin-Etsu Chemical @)) 0.5g
・Ultraviolet absorber 5anduvor EPU (Sand@
)0.4g toluene 50
m・Methyl ethyl ketone 50 m
Furthermore, a transfer layer ink having the composition shown below was coated on one side of a polyester film having a thickness of 6 μm to obtain a transfer body having a transfer layer of 1 g and 7 m 2 .

・Sublimable disperse dye 5g・Ethyl cellulose 8g・Toluene
After 10 m of the obtained transfer member and receiver were superimposed so that the transfer layer and the receiving layer were in contact with each other, they were heated using point-like heat-sensitive means of a thermal head that generated heat under the control of electrical signals corresponding to image information. loaded into.

The transfer body was heated from the back side by a dotted heat-sensitive means of a thermal head to transfer the sublimable dye in the transfer layer into the receiving layer to form a natural color photographic image.

This transferred image had a whiteness of 95% GE or higher, did not curl, had no unevenness on the surface of the image due to heat shrinkage, and had a high density and high resolution image. In addition, the above receptor is 200
Although it was left in a high temperature room at ℃ for 10 hours, no thermal deformation occurred.

Claims (1)

[Claims] 1) A base material, and a solution containing a sublimable dye-staining resin, a curing agent for this resin, or a crosslinking agent for this resin, and a solvent is coated on the surface of this base material. A receptor for sublimation type thermal transfer recording in which an image is formed by sublimation transfer of the sublimable dye from a transfer body provided with a transfer layer containing a sublimable dye by heating, wherein the substrate is Chemical pulp 70-100% by weight fiber diameter 0.
A resin paint is applied to the surface of pulp paper made of cellulose fibers of 5 to 9 μm at a coating weight of 10 to 40 g/m^2, and the roll temperature is 130 to 180°C and the pressure is 100 to 150 kg/m2.
A receptor for sublimation type thermal transfer recording, characterized in that it is made by pressing at cm^2. 2) The receptor for sublimation type thermal transfer recording according to claim 1, wherein the resin coating contains 0.5 to 80% by weight of acrylic acid resin and 0.05 to 50% by weight of polyethylene wax.