JPS6221590A - Sublimation transfer printing paper - Google Patents

Abstract

PURPOSE:To prevent a treating liquid for forming a receiving layer from infiltrating into a paper base and enable a smooth receiving layer to be provided, by providing a barrier layer of an organic high molecular weight substance between the receiving layer and the paper base. CONSTITUTION:The sublimation transfer printing paper comprises the paper base 1, the barrier layer 2 of an organic high molecular weight substance provided on at least one side of the base 1, and the receiving layer which is provided on the layer 2 and comprises 20-98pts.wt. of a thermoplastic resin and 80-2pts.wt. of a radical-polymerizable resin. The barrier layr 2 is formed of, for example, polyethylene, polypropylene, a polyester, a polycarbonate, polystyrene or an acrylic resin, and has a Bekk smoothness of not lower than 800sec, so that a treating liquid for forming the receiving layer is prevented from infiltrating into the paper base, and a smooth receiving layer can be provided. Accordingly, details of an image can be reproduced with good fidelity, and an image with high quality and high resolution can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a photographic paper for sublimation transfer, which is mainly used for printing color images with high clarity by sublimation transfer of a sublimable dye.

[Summary of the invention]

The present invention consists of a sublimation transfer photographic paper, a paper base, an organic polymer barrier layer with a Beck smoothness of 800 seconds or more formed on one or both sides of the paper base, and a sublimation dye that can be transferred and colored well, and an ink. By comprising a receptor layer to prevent fusion with the ribbon, it is possible to obtain high-quality images.

[Conventional technology]

An ink made by dispersing or dissolving a sublimable dye in a resin liquid is applied onto paper and dried to create a dyed ribbon. A thermal head is applied from the back side of the ink to heat it, sublimating the dye in the ink and creating an appropriate color. Color copies can be obtained by transferring onto treated photographic paper.

The applicant has filed Japanese Patent Application No. 57-97346.
212994), proposed a photographic paper for sublimation transfer in which a heat-resistant treated if (receiving layer) was formed that could efficiently capture sublimation dyes and dye them at high density to form stable images.This invention The photographic paper for sublimation transfer according to the above comprises a paper base material, 20 to 98 parts by weight of a thermoplastic resin formed on the paper base material and having dyeability to disperse dyes, and a radical polymerizable resin in one molecule. Compound 8 having two or more unsaturated bonds of
The heat-resistant treatment layer is formed by crosslinking a composition containing 0 to 2 parts by weight.

[Problem that the invention seeks to solve]

The problems regarding effective transfer color development of sublimation dyes and prevention of fusion with the ink ribbon in photographic paper for sublimation transfer were solved by the above invention in which a heat-resistant treatment layer (receiving layer) was formed. There were some insufficiencies regarding the surface smoothness. That is, no matter how much the paper base material is made denser or subjected to high-pressure calendering, unevenness remains in the paper base material, and the resulting unevenness appears on the surface, causing rough images. On the other hand, when paper base material is subjected to neutral treatment to increase whiteness in order to improve image quality, a phenomenon occurs in which sublimation dye passes through the paper base material and migrates to the back side, contaminating other photographic papers. occurs. If acidic paper is used, this phenomenon can be suppressed, but discoloration of the paper base material itself becomes a problem.

In addition, when applying a processing liquid to form a dye-receptive layer, the applied processing liquid impregnates the paper base material, making the surface of the processing layer not smooth, resulting in a high-quality, high-resolution image. There was a problem that I couldn't get it.

The present invention provides a sublimation transfer photographic paper that can solve the above problems.

[Means for solving problems]

The photographic paper for sublimation transfer according to the present invention includes a paper base material (]), an organic polymer barrier N (2) having a Bekk smoothness of 800 seconds or more formed on at least one surface of the paper base material (1),
20 to 98 parts by weight of thermoplastic resin and 80 parts by weight of radically polymerizable resin are provided on this organic polymer barrier layer (2).
It consists of a receptor layer (3) containing ~2 weight units.

The structure of this photographic paper includes, for example, a structure in which an organic polymer barrier layer (2) is formed only on one side of a paper base material (1), and a receptor layer (3) is provided on this (see Figure 1); A structure in which organic polymer barriers N (2) are formed on both sides of the base material fil, and a receptive layer (3) is provided only on one of the organic polymer barrier layers (2) (see Figure 2), paper base There is a configuration (see FIG. 3) in which an organic polymer barrier N (2) and a receptor layer (3) are provided on both sides of the material (1), respectively.

Note that the thicknesses of the organic polymer barrier layer (2) and the receptor layer (3) are not particularly limited, but are preferably 0.5 to 20 tt.

The organic polymer barrier layer (2) can be formed of, for example, polyethylene, polypropylene, polyester, polycarbonate, polystyrene, acrylic resin, or the like. The forming method is performed by coating, extrusion lamination, etc. Also,
Inorganic particles made of TiO2 or the like may be added to improve the whiteness.

The receptor layer (3) contains 20 to 98 parts by weight of a thermoplastic resin having dyeability to disperse dyes and 80 to 2 parts by weight of a compound having two or more radically polymerizable unsaturated bonds in one molecule. It is formed by crosslinking a composition containing

Thermoplastic resins having dyeability with disperse dyes include saturated linear polyester resins, epoxy resins, cellulose acetate resins, and nylon resins. Further, for example, by crosslinking the polyester resin with isocyanate, a part of the thermoplastic resin may be crosslinked by other means to adjust heat resistance, dyeability, stability, etc.

In addition, compounds having two or more unsaturated bonds in one molecule that can be used in the present invention include, for example, diallylphthalate,
trimethylolpropane tri(meth)acrylate,
Trimethylolethanetri(meth)acrylate, Tetramethylolethanetri(meth)acrylate, 1.
6-hexanethiol di(meth)acrylate, 2.2
-Bis[4-(acryloyloxyjethoxy)phenyl]propane, bis(acryloyloxyethyl)hydroxyethyl isocyanurate-1-11-lis(acryloyloxyethyl)isocyanurate, diallyloxydiacryloyloxychlorohexane Highly functional monomers such as bisphenol A type epoxy acrylate-1
・Multifunctional epoxy acrylates represented by novolac type epoxy acrylate, alkylene glycol jepoxy acrylate, brominated epoxy acrylate, glycidyl ester acrylate, etc., saturated dicarboxylic acids such as orthophthalic acid, isophthalic acid, terephthalic acid, adipic acid, sebacic acid, etc. A polyfunctional unsaturated polyester obtained by reacting an unsaturated dicarboxylic acid such as fumaric acid, maleic acid, or iconic acid with the terminal end of a reaction product of a polyol such as ethyl glycol, propylene glycol, or bisphenol A, 1 .2-Polybutadiene, acrylic terminal-modified polybutadiene, terminal ester-modified polybutadiene, etc., represented by polybutadiene, ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate-I, 1.3 - Multifunctional polyether acrylate represented by butylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, etc., adipic acid and 1.6-
These include polyester acrylates, which are typified by compounds in which the ends of polyesters reacted with hequinsandiol are acrylic-modified.

In order to react these unsaturated bonds, a peroxide such as benzoyl peroxide or hydroperoxide is dissolved as an initiator in the treatment solution, or a metal such as cobalt naphthenate is used as a promoter to further accelerate the reaction. Soap and tertiary amines such as dimethylaniline and dimethylparatoluidine may also be used. Further, crosslinking may be achieved by adding a sensitizer such as benzoin ethyl ether or benzophenone and irradiating with ultraviolet rays. Furthermore, crosslinking using ionizing radiation such as electron beams and X-rays also achieves the purpose and is not particularly regulated.

In addition, the molecular weight of a compound having two or more radically polymerizable unsaturated bonds in one molecule is preferably 100 to 10,000; if the molecular weight is less than 100, it will become hard;
If it is more than 00, the effect of preventing fusion between the ink ribbon and the photographic paper during thermal transfer will be lost.

The treatment solution for forming the receptor layer (3) may contain silica or
Up to 50% by weight of inorganic particles such as calcium carbonate, kaolin clay, barium sulfate, titanium oxide, etc. may be added. Adding ta-free particles to the processing solution has the effect of making the surface of the photographic paper uniform, increasing whiteness, increasing color development, and making it difficult for fusion to occur, but adding more than 50% by weight This weakens the ability of the resin to hold the inorganic particles, causing particles to fall off and uneven color development during printing.

In addition, in order to further increase the whiteness, 4,4'-bis(4
, 6-disubstituted-1,3,5-triazinyl-disulfonic acid compounds, α,β-bis(penzooxicazolyl)ethylene compounds, alkoxynaphthalic acid-N-substituted imide compounds, etc. Fluorescent whitening dyes may also be added. In this case, the fluorescent whitening dye can be added in an amount of 0.01 to 5.0 parts by weight per 100 parts by weight of the resin.

[Effect]

According to the present invention, an organic polymer barrier layer (2) having a Bekk smoothness of 800 seconds or more and an infinite air permeability between the receiving layer (heat-resistant treated layer) (3) and the paper base material (1) is provided. ) prevents the paper base material (1) from being impregnated with the treatment liquid for forming the receptor layer (3).
) can be formed. Furthermore, the provision of this organic polymer barrier layer (2) is also effective in preventing the sublimable dye from migrating to the back surface.

〔Example〕

Example (11) As shown in Figure 1, polyethylene (YK-60
, manufactured by Mitsubishi Yuka Co., Ltd.) using an extruder so that the amount of
form. Next, on this organic polymer barrier layer (2), treatment liquid A having the following composition was applied to a dry weight of 5 [/g].
After coating, the receptive layer (3) is formed by heating and curing at 120'C for 5 minutes to obtain a sublimation transfer print IJE (41) according to this example.

Treatment liquid A> The Bekk smoothness of this paper base material Tll itself is 100s
ec.

The Bekk smoothness after forming the organic polymer barrier layer (2) is 1800 sec, and the Bekk smoothness after forming the receptor layer (3) is 2400 sec.

Example (2) As shown in Figure 2, treatment liquid B having the following composition was applied to both sides of the paper base (1) made of the same high-quality paper as in Examples (1 and 1) at a rate of 10 g/rrr. Apply and calendar treatment to form an organic polymer barrier layer (2) C (2a)
.

(2b)) is formed. Next, on one side of the organic polymer barrier layer (2a), a treatment liquid C having the following composition was applied to a dry weight of 5 g/rd, and then heated at 120°C for 5 g/rd.
A receptor layer (3) is formed by heating and curing for a minute to obtain a sublimation transfer print IE (41) according to this example.

<Processing liquid B) Processing liquid C> In this sublimation transfer printing paper (4), the Beck smoothness after forming the organic polymer barrier layer (2) was 3000 se.
c, Bekk smoothness after forming the receptor layer (3) is 340
It is 0 sec.

Example (3) As shown in FIG. 1, acrylic resin (Paraloid A
-30, Rohm and Haas) with a dry weight of 10 g/
An organic polymer barrier layer (2) is formed by coating with a 20% methyl ethyl ketone solution so as to provide rrr.

Next, Example T1 was applied onto this organic polymer barrier layer (2).
After applying the processing liquid A used in + to a dry weight of 10 g/nf, it was heated and cured at 120° C. for 5 minutes to form a receptor layer (3), and the photographic paper for sublimation transfer according to this example was prepared. (4) is obtained.

In this sublimation transfer printing paper (4), the Beck smoothness after forming the organic polymer barrier layer (2) is 800 sec.
.

Bekk smoothness after forming the receptor layer (3) is 1100s
It is ec.

Comparative Example Treatment liquid C used in Example (2) was applied to one side of a paper base made of high-quality paper (basis weight 170 g/n?) with a dry weight of 5 g/n.
? After coating, a receptor layer is formed by irradiation and curing with an ultraviolet lamp to obtain a sublimation transfer photographic paper according to this comparative example. In this photographic paper for sublimation transfer, the Bekk smoothness of the high-quality paper is 100 sec, and the Bekk smoothness after formation of the receptor layer is 500 sec.

Next, an ink ribbon was prepared by applying a treatment liquid having the following composition onto a 14 μm thick capacitor paper so that the dry weight was 1 g/nf.

Then, using a sublimation transfer printer using this ink ribbon, printing was performed on the sublimation transfer photographic papers obtained in Examples (1) to (3) and Comparative Example above, and the image quality and dye transferability were evaluated. The results are shown in the table below, and the image quality is
Evaluation was made by performing a full-surface transfer (solid print) of medium m (approximately 0.8 on Macbeth densitometer) onto photographic paper, and then visually observing the presence or absence of unevenness in the print. In addition, the dye migration property is
In Table 0, evaluation was made one week after printing at 40° C. and 90% humidity, where 0 indicates good, Δ indicates slightly poor, and × indicates poor.

〔Effect of the invention〕

According to the photographic paper for sublimation transfer according to the present invention, since an organic polymer barrier layer with a Bekk smoothness of 800 seconds or more is formed, impregnation of the paper base material with the treatment liquid for forming a receptor layer is prevented. , a smooth receptor layer can be formed. Therefore,
This makes it possible to faithfully reproduce minute details, resulting in high-quality, high-resolution images.

Furthermore, since this organic polymer barrier layer has infinite air permeability, it is also effective in preventing sublimation dye from migrating to the back side.

Furthermore, since the receiving layer is formed which contains 20 to 98 parts by weight of a thermoplastic resin and 80 to 2 parts by weight of a radically polymerizable resin, the ink ribbon does not fuse with the ink binder; The dye concentration is obtained.

[Brief explanation of drawings]

1 to 3 are cross-sectional views of the sublimation transfer photographic paper according to this embodiment. (1) is paper base material, (21((2a), (2b)
) is an organic polymer barrier layer, +31 ((3a),
(3b) ) is a receptor layer, and (4) is a sublimation transfer photographic paper.

Claims (1)

[Claims] A paper base material, and a Beck smoothness of 8 formed on at least one surface of the paper base material.
00 sec or more, and a receptor layer provided on the organic polymer barrier layer and containing 20 to 98 parts by weight of a thermoplastic resin and 80 to 2 parts by weight of a radically polymerizable resin. Photographic paper for sublimation transfer.