JPH10309875A - Highly glossy thermal fusion thermal transfer recording sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly glossy thermal fusion thermal transfer recording sheet, and a production method thereof, for forming a highly glossy clear image with high resolution excellent in ink transfer properties, dot reproducibility, print density gradation reproducibility and head abrasion properties in which dot miss is prevented over the entire region of thermal energy being applied to a thermal head, i.e., from a low energy (low density) region to a high energy (high density) region, without staining a ribbon. SOLUTION: The highly glossy thermal fusion thermal transfer recording sheet comprises at least one coating layer provided on a support and the uppermost layer is a recording layer composed of 50-90 pts.wt. of an inorganic pigment, 5-50 pts.wt. of an organic pigment having air gaps, and 10-50 pts.wt. of a binder for 100 pts.wt. of the pigment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high gloss type heat-melt type thermal transfer recording sheet suitable for a hot-melt type thermal transfer printer and having high gloss and excellent dot reproducibility.

[0002]

2. Description of the Related Art In recent years, films (ink ribbons) coated with cyan, magenta, yellow, and black ink layers
A fusion type thermal transfer printer, which combines paper and paper (image receiving paper) together and passes it through a thermal head, where heat is applied to heat and transfer the ink to paper, has been widespread. As the image receiving paper in this system, high smoothness paper surface-treated with a super calendar or the like is used as thermal transfer recording paper. In particular, it has been conventionally known that the sharpness of a transferred image is improved when the smoothness of the recording surface is 100 seconds or more.
High smoothness increases the adhesion to the ink ribbon, and thus improves ink transferability.

However, in recent years, there has been an increasing demand for higher definition and higher image quality. In this sense, the thermal transfer recording paper has a high density of print density gradation reproducibility in halftone, and in particular, a high energy applied to the head. At present, high-resolution and high-definition printing characteristics have not been obtained due to the occurrence of print density gradation reproducibility in the area and dot missing (reproducibility) in the low energy area.

[0004] On the other hand, art paper and cast-coated paper as coated papers having high glossiness have few irregularities and voids on the surface of the coating layer, and thus cannot sufficiently receive the molten ink, resulting in remarkable transfer failure. It was unsuitable for thermal transfer recording paper. Thus, a method has been proposed in which synthetic silica having a specific specific surface area is contained in a coating layer in a certain amount or more and cast coating is applied to improve glossiness and improve ink transferability (see JP-A-5-131766). .

However, the inclusion of a pigment having a high specific surface area, such as synthetic silica, in the coating layer improves the transfer characteristics by increasing the unevenness and voids on the surface of the coating layer. Is that the ink is transferred thinly to the paper even when the thermal head is not heated, which causes development (ribbon contamination), the abrasion of the thermal head is poor and the printer is easily damaged, and gloss is higher than that of general cast coated paper. In addition to problems such as low ink density, improved dot transfer (reproducibility) in low energy (low density) areas and halftone reproducibility, especially high energy (high density) ) The print density gradation reproducibility in the area was insufficient. Therefore, a high-definition, high-definition, high-quality image comparable to ordinary offset printing or silver halide photography could not be obtained.

[0006]

The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, in a thermal transfer recording paper having at least one or more coating layers on a support, it has been found that the most The surface layer is a recording layer, and the recording layer contains 50 to 90 parts by weight of an inorganic pigment and 5 to 5 parts by weight of an organic pigment having voids.
It has been found that this is achieved by 0 to 10 parts by weight of binder and 100 to 50 parts by weight of pigment.

In the present invention, a porous organic pigment having an average particle diameter of 25 μm or less is used. Further, among the inorganic pigments, the oil absorption according to JIS K 5101 method is 60.
The amount of the inorganic pigment of ml / 100 g or more is 0 to 30 parts by weight. The recording layer is provided by a casting method. Further, the 75 ° specular blank glossiness of the recording layer is 6
0% or more.

The inorganic pigment used in the present invention is not particularly limited, but has an oil absorption of 60 ml according to JIS K 5101 method.
The inorganic pigment of / 100 g or more is a preferable inorganic pigment because it absorbs the melted ink due to its porosity, thereby improving ink transferability and ink fixability. The oil absorption according to the JIS K 5101 method used in the present invention is 60 ml / 10
Examples of the inorganic pigment of 0 g or more include calcined kaolin, magnesium hydroxide, magnesium carbonate, aluminum silicate, synthetic silica, aluminum hydroxide, and diatomaceous earth. However, since these inorganic pigments are porous, there are problems such as a decrease in glossiness, easy occurrence of ribbon contamination, and large head abrasion.
It must be 30 parts by weight, preferably 5 to 25 parts by weight. Other inorganic pigments to be combined include calcium carbonate, clay, talc, kaolin, barium sulfate, titanium dioxide, zinc and the like, but are not particularly limited.

The organic pigment having voids used in the present invention includes:
The pigment has voids and the average particle size is 2
What is necessary is just 5 micrometers or less. The composition of the organic pigment is not particularly limited, and examples thereof include polymer fine particles such as styrene, ethylene, vinyl chloride, polyurethane, acryl, vinyl acetate, polycarbonate, and nylon, and copolymers thereof. A styrene-acrylic copolymer is preferably used from the viewpoint of heat resistance and the like. If the average particle diameter exceeds 25 μm, the unevenness of the recording layer becomes large, so that the transfer of the ink is unfavorably deteriorated. The use of organic pigments with voids improves the cushioning properties of the recording layer, thereby improving the adhesion and heat insulation between the thermal head and the recording surface, and transferring the thermal energy of the thermal head without waste, thus producing color. The effect of improving sensitivity is obtained.
In addition, since organic pigments are softer than inorganic pigments, head abrasion hardly occurs. Further, an effect of improving glossiness can be obtained.

The compounding amount of the organic pigment is preferably 5 to 50 parts by weight. If the amount is less than 5 parts by weight, the above-mentioned improvement effect cannot be obtained. If the amount exceeds 50 parts by weight, the ink transferability is improved, and at the same time, dot omission (reproducibility) in a low energy (low density) area and halftone reproducibility, particularly, print density in a high energy (high density) area. It is possible to form a recording layer having good tone reproducibility. That is, in the case of a material mainly composed of a porous pigment having a high oil absorption, there is a loss in the transfer of thermal energy of the thermal head, and as a result,
Despite improved ink transferability, dot omission (reproducibility) and halftone reproducibility in low energy (low density) areas, especially print density gradation reproducibility in high energy (high density) areas Is considered to have a problem.

The binder is preferably a resin which has a strong adhesion to the pigment and the base paper and does not cause blocking between papers or between the paper and the ink ribbon. Emulsion, latex, natural polymer or the like is used alone or in combination. it can. Examples of such a binder include a styrene-butadiene copolymer, a modified styrene-butadiene copolymer, an acrylonitrile-butadiene copolymer, a methyl methacrylate butadiene copolymer, a chloroprene latex, a acrylate ester and a methacrylate ester. Copolymer or copolymer, ethylene-vinyl acetate copolymer, vinyl acetate-maleic acid ester copolymer, acryl-vinyl acetate copolymer, vinyl acetate copolymer, starch, oxidized starch, esterified starch, enzyme-modified starch, Cationized starch, polyvinyl alcohol,
Hydroxyethyl cellulose, cellulose derivatives such as carboxymethyl cellulose, polyacrylamides, polyvinyl pyridine, polyethylene oxide, polyvinyl pyrrolidone, casein, sodium alginate, sodium polystyrene sulfonate, starch-acrylonitrile graft polymer hydrolyzate, sulfonated chitin, carboxylated chitin and Chitosan and derivatives thereof can be exemplified.

The amount of the binder to be added in the coating composition is preferably 10 to 50 parts by weight based on 100 parts by weight of the pigment. The binder is 10 per 100 parts by weight of the pigment.
If the amount is less than the weight part, the strength of the coating layer is weak, and problems such as falling off of the coating layer and powder drop occur, which is not preferable. On the other hand, if the amount exceeds 50 parts by weight, the coatability is deteriorated or the pigment is coated, which impairs the properties of the pigment, which is not preferable. The coating liquid contains a dispersant, an antifoaming agent, a release agent, a pH adjuster, a lubricant, a water retention agent, a thickener, a surfactant, a fluorescent whitening agent, a coloring pigment, a coloring dye, if necessary. A flow improver or the like can be appropriately selected and added. The thermal transfer recording paper of the present invention can be easily obtained by providing a coating layer of the coating liquid thus adjusted by a cast coating method.

The coating amount is 5 to 5 on a dry basis per one side.
0 g / m ^2, is preferably a single-layer or multi-layer coating on-machine or off-machine coater such that 10~35g / m ^2. If the coating amount is less than 5 g / m ² , it is difficult to obtain a high degree of white paper gloss because the coating on the paper surface is insufficient. The coating amount is 50 g / m ^2.
If it exceeds, the cost increases, which is not preferable.

As a method of the cast coating, a known method such as a wet method, a re-wet method and a gelling method may be appropriately used. The coating method for obtaining the recording layer is not particularly limited, and general coating methods, for example, blade coater, roll coater, reverse roll coater, air knife coater, die coater, bar coater, gravure coater, curtain Coating methods such as a coater, a Chambers coater, a lip coater, and a rod coater can be adopted.

Examples of the gelling solution used for cast coating by the gelling method include formic acid, acetic acid, citric acid, tartaric acid, lactic acid, hydrochloric acid, calcium, zinc, barium, lead, magnesium, cadmium, and aluminum. Various salts, furthermore, potassium sulfate, potassium citrate,
Borax, boric acid and the like are common, but are not particularly limited in the present invention. Also, by selecting a binder that effectively gels with these gelling agents as the binder, it is effective in improving the coating speed and improving the finish state of the coated surface.

As the base paper, acid and neutral high quality paper and medium paper can be used, but it is preferable to use a base paper having coating suitability as a coating base paper.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described more specifically with reference to the following examples, but the present invention is not limited to these examples. In the examples, “parts” and “%” indicate “parts by weight” and “% by weight” unless otherwise specified. Example 1 In a pulp formulation consisting of 90 parts of LBKP and 10 parts of NBKP, 0.7% of cationic starch, 0.07% of alkenyl succinic anhydride, and 20 parts of heavy calcium carbonate were added to pulp.
% And a band prepared by adding a band of 1% to a Fourdrinier paper machine, and applying an aqueous solution containing a surface sizing agent (alkyl ketene dimer) to 0.5 g / m ² on both sides of the dry solid content in a size press. And dried, then dried
4.3 g / m ² of base paper was obtained. Separately, 60 parts of kaolin (trade name: Alpha Coat, manufactured by ECCAmerica Inc, oil absorption: 40 ml / 100 g), 35 parts of light calcium carbonate (trade name: TP222HS, manufactured by Okutama Industry Co., oil absorption: 2)
8 ml / 100 g), 5 parts of organic pigment A having a void (trade name: Rope Ike HP-91, manufactured by Rohm and Haas Co., Ltd., average particle size 1.0 μm), and 0.1 part of sodium polyacrylate was added. A 60% pigment slurry was prepared using a Cores disperser. Casein solution 1 was added to this slurry.
0 parts (solid content) and 10 parts (solid content) of styrene-butadiene copolymer latex were added, and water was further added to prepare a coating solution having a solid content concentration of 43%. The coating liquid thus obtained is coated on the base paper by a reverse roll coater so as to have a dry weight of 25 g / m ² on one side, and gelled with a 10% aqueous solution of calcium formate as a gelling agent. While it was wet, it was pressed against a cast drum having a mirror surface heated to 100 ° C. and dried to obtain a thermal transfer recording sheet.

Example 2 As a pigment, 60 parts of kaolin (trade name: Alpha Coat, manufactured by ECCAmerica Inc., oil absorption: 40 ml / 100)
g), 20 parts of light calcium carbonate (trade name: TP222)
HS, manufactured by Okutama Industry Co., Ltd., oil absorption 28ml / 100g),
20 parts of organic pigment A having voids (trade name: Ropaike H)
P-91, manufactured by Rohm and Haas, average particle size 1.0
μm) to obtain a thermal transfer recording sheet in the same manner as in Example 1.

Example 3 As a pigment, 40 parts of kaolin (trade name: Alpha Coat, manufactured by ECCAmerica Inc., oil absorption: 40 ml / 100)
g), 10 parts of light calcium carbonate (trade name: TP222)
HS, manufactured by Okutama Industry Co., Ltd., oil absorption 28ml / 100g),
50 parts of organic pigment A having voids (trade name: Lowpake H
P-91, manufactured by Rohm and Haas, average particle size 1.0
μm) to obtain a thermal transfer recording sheet in the same manner as in Example 1.

Example 4 40 parts of kaolin as a pigment (trade name: Alpha Coat, manufactured by ECCAmerica Inc., oil absorption: 40 ml / 100)
g), 10 parts of light calcium carbonate (trade name: TP222)
HS, manufactured by Okutama Industry Co., Ltd., oil absorption 28ml / 100g),
30 parts of synthetic silica (trade name: Mizukasil P-78A, manufactured by Mizusawa Chemical Co., Ltd., oil absorption: 245 ml / 100 g), 20 parts of organic pigment A having voids (trade name: Ropaike HP-9)
1, Rohm and Haas Co., Ltd., average particle size 1.0 μm)
A thermal transfer recording sheet was obtained in the same manner as in Example 1, except that

Example 5 As a pigment, 40 parts of kaolin (trade name: Alpha Coat, manufactured by ECCAmerica Inc., oil absorption: 40 ml / 100)
g), 10 parts of light calcium carbonate (trade name: TP222)
HS, manufactured by Okutama Industry Co., Ltd., oil absorption 28ml / 100g),
30 parts of aluminum silicate (trade name: Persilex P-
820, Degussa Japan, oil absorption 190ml / 10
0g), and a heat transfer recording paper was obtained in the same manner as in Example 1 except that the organic pigment A having voids was 20 parts (trade name: Ropaike HP-91, manufactured by Rohm and Haas Co., Ltd., average particle size: 1.0 μm). .

Example 6 As a pigment, 40 parts of kaolin (trade name: Alpha Coat, manufactured by ECCAmerica Inc., oil absorption: 40 ml / 100)
g), 10 parts of light calcium carbonate (trade name: TP222)
HS, manufactured by Okutama Industry Co., Ltd., oil absorption 28ml / 100g),
30 parts of calcined kaolin (trade name: Ansilex 93, manufactured by Engelhard Co., oil absorption: 80 ml / 100 g), 20 parts of organic pigment A having voids (trade name: Ropaike HP-)
91, manufactured by Rohm and Haas Co., Ltd., average particle size 1.0 μm
A thermal transfer recording sheet was obtained in the same manner as in Example 1 except that m) was used.

Example 7 As a pigment, 60 parts of kaolin (trade name: Alpha Coat, manufactured by ECCAmerica Inc., oil absorption: 60 ml / 100)
g), 35 parts of light calcium carbonate (trade name: TP222)
HS, manufactured by Okutama Industry Co., Ltd., oil absorption 28ml / 100g),
5 parts of organic pigment B having voids (trade name: Grosdale 2)
000TX, manufactured by Mitsui Toatsu Chemicals, average particle size 0.5μ
A thermal transfer recording sheet was obtained in the same manner as in Example 1 except that m) was used.

Example 8 As a pigment, 60 parts of kaolin (trade name: Alpha Coat, manufactured by ECCAmerica Inc., oil absorption: 40 ml / 100)
g), 35 parts of light calcium carbonate (trade name: TP222)
HS, manufactured by Okutama Industry Co., Ltd., oil absorption 28ml / 100g),
20 parts of organic pigment B having voids (trade name: Grosdale 2000TX, manufactured by Mitsui Toatsu Chemicals, Inc., average particle size 0.5 μm)
A thermal transfer recording sheet was obtained in the same manner as in Example 1 except that m) was used.

Example 9 As a pigment, 40 parts of kaolin (trade name: Alpha Coat, manufactured by ECCAmerica Inc., oil absorption: 40 ml / 100)
g), 35 parts of light calcium carbonate (trade name: TP222)
HS, manufactured by Okutama Industry Co., Ltd., oil absorption 28ml / 100g),
50 parts of organic pigment B having voids (trade name: Grosdale 2000TX, manufactured by Mitsui Toatsu Chemicals, Inc., average particle size 0.5 μm)
A thermal transfer recording sheet was obtained in the same manner as in Example 1 except that m) was used.

Example 10 As a pigment, 40 parts of kaolin (trade name: Alpha Coat, manufactured by ECCAmerica Inc., oil absorption: 40 ml / 100)
g), 10 parts of light calcium carbonate (trade name: TP222)
HS, manufactured by Okutama Industry Co., Ltd., oil absorption 28ml / 100g),
30 parts of synthetic silica (trade name: Mizukasil P-78A, manufactured by Mizusawa Chemical Co., Ltd., oil absorption 245 ml / 100 g), 20 parts of organic pigment B having voids (trade name: Grosdale 2000)
Thermal transfer recording paper was obtained in the same manner as in Example 1 except that TX, manufactured by Mitsui Toatsu Chemical Co., Ltd., average particle size 0.5 μm).

Example 11 As a pigment, 40 parts of kaolin (trade name: Alpha Coat, manufactured by ECCAmerica Inc, oil absorption: 40 ml / 100)
g), 10 parts of light calcium carbonate (trade name: TP222)
HS, manufactured by Okutama Industry Co., Ltd., oil absorption 28ml / 100g),
30 parts of aluminum silicate (trade name: Persilex P-
820, Degussa Japan, oil absorption 190ml / 10
0g), and a heat transfer recording paper was obtained in the same manner as in Example 1 except that the organic pigment B having voids was 20 parts (trade name: Grosdale 2000TX, manufactured by Mitsui Toatsu Chemicals, Inc., average particle diameter: 0.5 μm). .

Example 12 As a pigment, 40 parts of kaolin (trade name: Alpha Coat, manufactured by ECCAmerica Inc., oil absorption: 40 ml / 100)
g), 10 parts of light calcium carbonate (trade name: TP222)
HS, manufactured by Okutama Industry Co., Ltd., oil absorption 28ml / 100g),
30 parts of calcined kaolin (trade name: Ansilex 93, manufactured by Engelhard Co., oil absorption 80 ml / 100 g), 20 parts of organic pigment B having voids (trade name: Grosdale 20)
00TX, manufactured by Mitsui Toatsu Chemicals, average particle size 0.5 μm)
A thermal transfer recording sheet was obtained in the same manner as in Example 1, except that

Comparative Example 1 60 parts of kaolin as a pigment (trade name: Alpha Coat, manufactured by ECCAmerica Inc., oil absorption 40 ml / 100)
g), 40 parts of light calcium carbonate (trade name: TP222)
HS, manufactured by Okutama Kogyo Co., Ltd., oil absorption 28 ml / 100 g), except that a thermal transfer recording paper was obtained in the same manner as in Example 1.

Comparative Example 2 As a pigment, 60 parts of kaolin (trade name: Alpha Coat, manufactured by ECCAmerica Inc, oil absorption: 40 ml / 100)
g), 20 parts of light calcium carbonate (trade name: TP222)
HS, manufactured by Okutama Industry Co., Ltd., oil absorption 28ml / 100g),
A thermal transfer recording paper was obtained in the same manner as in Example 1 except that 20 parts of synthetic silica (trade name: Mizukasil P-78A, manufactured by Mizusawa Chemical Co., Ltd., oil absorption: 245 ml / 100 g) was used.

Comparative Example 3 As a pigment, 60 parts of kaolin (trade name: Alpha Coat, manufactured by ECCAmerica Inc, oil absorption: 40 ml / 100)
g), 20 parts of light calcium carbonate (trade name: TP222)
HS, manufactured by Okutama Industry Co., Ltd., oil absorption 28ml / 100g),
20 parts of aluminum silicate (trade name: Persilex P-
820, Degussa Japan, oil absorption 190ml / 10
A thermal transfer recording sheet was obtained in the same manner as in Example 1 except that the amount was 0 g).

Comparative Example 4 60 parts of kaolin as a pigment (trade name: Alpha Coat, manufactured by ECCAmerica Inc., oil absorption: 40 ml / 100)
g), 20 parts of light calcium carbonate (trade name: TP222)
HS, manufactured by Okutama Industry Co., Ltd., oil absorption 28ml / 100g),
A thermal transfer recording paper was obtained in the same manner as in Example 1, except that 20 parts of calcined kaolin (trade name: Ansilex 93, manufactured by Engelhard Co., oil absorption: 80 ml / 100 g) were used.

Comparative Example 5 As a pigment, 40 parts of kaolin (trade name: Alpha Coat, manufactured by ECCAmerica Inc, oil absorption: 40 ml / 100)
g), 40 parts of synthetic silica (trade name: Mizukasil P-78)
A, manufactured by Mizusawa Chemical Co., Ltd., oil absorption: 245 ml / 100 g), 20 parts of organic pigment A having voids (trade name: Lowpake HP)
-91, manufactured by Rohm and Haas Co., Ltd., average particle size 1.0 μm
A thermal transfer recording sheet was obtained in the same manner as in Example 1 except that m) was used.

Comparative Example 6 As a pigment, 40 parts of kaolin (trade name: Alpha Coat, manufactured by ECCAmerica Inc., oil absorption: 40 ml / 100)
g), 40 parts of aluminum silicate (trade name: Persilex P-820, manufactured by Degussa Japan, oil absorption 190 ml)
/ 100 g), 20 parts of organic pigment A having voids (trade name: ROPAKE HP-91, manufactured by Rohm and Haas Co., Ltd.)
A thermal transfer recording paper was obtained in the same manner as in Example 1 except that the average particle diameter was changed to 1.0 μm.

Comparative Example 7 As a pigment, 40 parts of kaolin (trade name: Alpha Coat, manufactured by ECCAmerica Inc., oil absorption: 40 ml / 100)
g), 40 parts of calcined kaolin (trade name: Ansilex 9)
3. Engelhard Co., oil absorption 80ml / 100
g), a thermal transfer recording paper was obtained in the same manner as in Example 1 except that the organic pigment A having voids was 20 parts (trade name: Ropaike HP-91, manufactured by Rohm and Haas Co., Ltd., average particle diameter: 1.0 μm). .

Comparative Example 8 As a pigment, 40 parts of kaolin (trade name: Alpha Coat, manufactured by ECCAmerica Inc., oil absorption: 40 ml / 100)
g), 40 parts of synthetic silica (trade name: Mizukasil P-78)
A, manufactured by Mizusawa Chemical Co., Ltd., oil absorption 245 ml / 100 g), 20 parts of organic pigment B having voids (trade name: Grosdale 2)
000TX, manufactured by Mitsui Toatsu Chemicals, average particle size 0.5μ
A thermal transfer recording sheet was obtained in the same manner as in Example 1 except that m) was used.

Comparative Example 9 As a pigment, 40 parts of kaolin (trade name: Alpha Coat, manufactured by ECCAmerica Inc, oil absorption: 40 ml / 100)
g), 40 parts of aluminum silicate (trade name: Persilex P-820, manufactured by Degussa Japan, oil absorption 190 ml)
/ 100 g), and a thermal transfer recording paper was obtained in the same manner as in Example 1 except that the organic pigment B having voids was 20 parts (trade name: Grosdale 2000TX, manufactured by Mitsui Toatsu Chemicals, Inc., average particle size: 0.5 μm). Was.

Comparative Example 10 As a pigment, 40 parts of kaolin (trade name: Alpha Coat, manufactured by ECCAmerica Inc, oil absorption: 40 ml / 100)
g), 40 parts of calcined kaolin (trade name: Ansilex 9)
3. Engelhard Co., oil absorption 80ml / 100
g), and a thermal transfer recording paper was obtained in the same manner as in Example 1, except that the organic pigment B having voids was 20 parts (trade name: Grosdale 2000TX, manufactured by Mitsui Toatsu Chemicals, Inc., average particle diameter: 0.5 μm). .

[0039]

[Table 1]

[0040]

[Table 2]

With respect to the thermal transfer recording papers obtained in the above Examples and Comparative Examples, Table 1 shows the pigment formulation of each coating solution, and Table 2 shows the paper quality and thermal transfer printing evaluation results. In addition, the paper quality of the Example and the comparative example and the method of thermal transfer evaluation are as follows. (1) Gloss: The 75 ° specular gloss of the coating layer was measured according to JIS P8142. (2) Dot reproducibility: A gradation pattern in which the thermal energy of a thermal head for printing in CMYK single color and mixed colors is changed at 10% intervals from 10 to 100% with a full-color thermal transfer printer (trade name: MD-2000J) manufactured by Alps Electric. Is printed (solid printing is 100%). In each energy region, the state of occurrence of miss dots such as missing dots was visually determined.も の indicates that there were no misdots at all, Δ indicates that some misdots occurred, and x indicates that many misdots occurred.

(3) Crushing of solid portion: Alps Electric full color thermal transfer printer (trade name: MD-2000J)
Prints a gradation pattern in which the thermal energy of the thermal head for printing in CMYK single color and mixed colors is changed at 10% intervals from 10 to 100% (solid printing is 10
0%). The print density gradation at 80, 90, and 100% energy was visually determined.も の: good print density gradation, Δ: slightly poor, and x: poor. (4) Ribbon contamination: The thermal energy of the CMYK single-color and mixed-color printing thermal heads is reduced by 1 with an Alps Electric full-color thermal transfer printer (trade name: MD-2000J).
A gradation pattern changed from 0 to 100% at intervals of 10% is printed (solid printing is 100%). It was visually determined whether or not the ink had been transferred to the unprinted portion.イ ン ク indicates that no ink was transferred to the unprinted portion, Δ indicates that the ink was slightly transferred, and x indicates that the ink was clearly transferred.

[0043]

As described in detail above, the thermal transfer recording paper of the present invention has good ink transferability, and the thermal energy applied to the thermal head is from low energy (low density) to high energy (high density). No dot missing in the area, good dot reproducibility and excellent print density gradation reproducibility, no ribbon contamination, good head abrasion, high gloss, clear high resolution An image can be obtained, and it is particularly suitable as a thermal transfer recording sheet for a fusion type thermal transfer printer.

The organic pigment having voids has an average particle diameter of 25.
μm or less, the unevenness of the recording layer is small, the transferability of the ink is good, the adhesion to the thermal head is improved by improving the cushioning property of the recording layer, and the wear of the thermal head is reduced, The effect of improving the coloring sensitivity by improving the heat insulating property can be obtained. In addition, by setting the organic pigment to a specific amount, the adhesiveness (transfer) between the recording layer (coated surface) and the ink is improved.

The oil absorption according to JIS K 5101 method is 6
An inorganic pigment of 0 ml / 100 g or more is a preferable inorganic pigment because of its porosity, so that the adhesiveness (transferability) to the ink is improved. Dirt and deterioration of thermal head wear are eliminated.

Further, according to the production method of the present invention, the thermal transfer recording paper of the present invention can be easily obtained by providing a coating layer of the coating liquid for coating the base paper by the cast coating method.

Claims (6)

[Claims] In a thermal transfer recording paper having at least one coating layer provided on a support, the outermost layer is a recording layer, and the recording layer contains 50 to 90 parts by weight of an inorganic pigment.
5 to 50 parts by weight of an organic pigment having voids, and pigment 1
A high gloss type heat melting type thermal transfer recording sheet characterized in that the binder is 10 to 50 parts by weight with respect to 00 parts by weight. 2. The heat transfer recording paper of high gloss type according to claim 1, wherein the organic pigment having voids has an average particle size of 25 μm or less. 3. JIS K510 among the above inorganic pigments
3. The high gloss type hot-melt type thermal transfer recording paper according to claim 1, wherein the amount of the inorganic pigment having an oil absorption of 60 ml / 100 g or more according to Method 1 is 0 to 30 parts by weight. 4. A 75 ° specular blank glossiness of the recording layer is 6
4. The high gloss type thermal fusion type thermal transfer recording paper according to claim 1, wherein the content is 0% or more. 5. In a thermal transfer recording paper having at least one coating layer provided on a support, the outermost layer is a recording layer, and the recording layer contains 50 to 90 parts by weight of an inorganic pigment.
5 to 50 parts by weight of an organic pigment having voids, and pigment 1
The binder is 10 to 50 parts by weight with respect to 00 parts by weight, the organic pigment having voids has an average particle diameter of 25 μm or less, and among the inorganic pigments, an inorganic pigment having an oil absorption of 60 ml / 100 g or more according to JIS K 5101 method is used. Pigment is 0-30
High gloss type heat melting type thermal transfer recording paper characterized by weight parts. 6. A method for producing a thermal transfer recording paper having at least one coating layer provided on a support, wherein the outermost recording layer has 50 to 90 parts by weight of an inorganic pigment and voids. 5 to 50 parts by weight of organic pigment, and pigment 10
A method for producing a high gloss type heat melting type thermal transfer recording paper, wherein a binder is provided by a cast coating method so as to be 10 to 50 parts by weight with respect to parts by weight.