JPS62152795A - Ink ribbon for sublimation transfer type hard copying - Google Patents

Abstract

PURPOSE:To obtain an ink ribbon having excellent preservation stability, by using a binder resin which comprises a resin having a bisphenol skeleton as a main constituent and has a specified glass transition point. CONSTITUTION:A resin having a bisphenol skeleton is selected as a main constituent of a binder resin, and the glass transition point Tg of the binder resin is set to be not lower than 55 deg.C, whereby a sublimable dye is prevented from being crystallized or being transferred to the face side or the back side of the ink ribbon. As a result, the preservation stability of the ink ribbon is enhanced, the using life of the product is prolonged, clear images can be obtained, and other favorable effects can be obtained. The resin having a bisphenol skeleton may be a bisphenol-type epoxy resin, a polycarbonate, a polyarylate, a polysulfone or the like, and is preferably used in an amount of at least 90wt% based on the total amount of the binder resin.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sublimation transfer ink ribbon used for hard copying still images such as television images.

[Summary of the invention]

The non-invention is a sublimation transfer type hard copy ink IJ/N containing a binder resin and a sublimable dye,
By using a binder resin having a glass transition point Tg of 55° C. or higher and mainly containing a resin having a bisphenol skeleton, an ink ribbon with excellent storage stability can be obtained. .

[Conventional technology]

Ink ribbons for sublimation transfer type hard copies are made by dissolving and dispersing sublimable dyes and binder resin in a solvent, and then applying the ink to the substrate, which is a high-strength, uniform thin paper or a heat-resistant plastic such as polyimide or polyester. It is made by coating on a film. Furthermore, photographic paper is produced by coating a base material with a resin such as polyester that has good adsorption properties for sublimable dyes. and,
By applying heat to the ink ribbon from the base material side with a thermal head, ink printing is possible. Only the dye in the dye is sublimated and transferred onto the photographic paper to form the desired color or black and white image on the photographic paper.

[Problem that the invention seeks to solve]

In the case of conventional sublimation transfer hard copy ink,
There were problems with storage stability due to the following points. In other words, it is extremely sensitive to high temperature and humidity conditions and to oils and fats such as plasticizers, and when the sublimable dye migrates to the surface of the ink clean, it crystallizes, and the crystallized dye is transferred as it is to the photographic paper, causing the image to disappear. The sharpness and detail of the images were lost, leading to a decline in image quality. In addition, the unstable sublimable dye was transferred to the back surface of the ink-clean substrate, staining the thermal head, causing a decrease in density, and a change in hue.

The present invention provides a sublimation transfer type hard copy ink cartridge that can solve the above problems.

[Means for solving problems]

The present invention provides a sublimation transfer type hard copy ink containing a binder resin and a sublimable dye. use.

The bisphenol skeleton refers to a skeleton having the following structural formula.

Examples of the names and structural formulas of such resins having a bisphenol skeleton are listed below.

Polycarbonate phenoxy (high molecular weight bisphenol A type epoxy) The resin having a polyarylate polysulfone bisphenol skeleton is contained in an amount of 90 wt % or more based on the total amount of the nonoinda resin. The binder resin may contain resins other than those having a bisphenol skeleton, such as ester, epoxy, nylon, and cellulose acetate, in an amount up to 30% by volume, but even in this case, the glass transition point Tg of the binder resin
temperature should be 55°C or higher.

As the sublimable dye, disperse dyes, oil-soluble dyes, etc. can be used. For example, the dye is contained in an amount of 0.1 to 2 parts by weight per 100 parts by weight of the resin. As additives, surfactants, fillers, crosslinking agents, etc. can be used arbitrarily. Next, the base material is thin paper with high density and smooth surface such as capacitor paper, polyester, polyimide,
A heat-resistant plastic film of polyamide or the like can be used, with a thickness in the range 3-25 microns, preferably 3-10 microns.

[Effect]

According to the present invention, by selecting a resin having a bisphenol skeleton as the main resin of the binder resin and setting the glass transition point Tg of the binder resin to 55°C or higher, the crystallization and sublimation properties of the sublimable dye are improved. Dye ink I)-N
It is possible to prevent the particles from moving to the front side or the back side. This increases the storage stability of the inklican, prolonging the life of the product, and producing clear images.

〔Example〕

Example 1 An ink having the following composition was prepared and printed on one side of capacitor paper using a gravure plate with a line count of 185 lines/inch and a plate depth of 40 μm to produce an ink cartridge.

Example 2 An ink having the following composition was prepared, and an ink cartridge was produced in the same manner as in Example.

Example 3 An ink having the following composition was prepared, and an ink cartridge was produced in the same manner as in Example 1.

Example 4 An ink having the following composition was prepared and applied onto a 10 μm thick capacitor paper so that the coating thickness was 1 μm to produce an inklican.

Example 5 Epototo YD-01 instead of U-100 in Example 4
2 (Tobu Kasei, bisphenol A type epoxy resin, 1g
60° C.), an ink ribbon was produced in the same manner.

Example 6 Epototo YD-01 instead of U-100 in Example 4
7 (Tobu Kasei, bisphenol A type epoxy resin, Tg
77° C.) to produce inclican in the same manner.

Example 7 Epototo YD instead of U-100 in Example 4
A mixed resin (Tg 62°C) consisting of 9 parts by weight of -014 (Tobu Kasei, bisphenol A type epoxy resin, Tg 65°C) and 1 part by weight of TP-219 (Nippon Gosei Kagaku Kogyo, polyester resin, Tg 40°C) was used. , Inclican was similarly produced.

Example 8 YD-012 (instead of U-100 in Example 4)
1g60℃) 7 parts by weight and UE-33oo (Unitika,
An ink resin was similarly prepared using a mixed resin (Tg 57°C) consisting of 3 parts by weight of polyester resin (1 g 50°C).

Example 9 JK Phenotote YP-50 (Tobu Kasei, phenoxy resin, Tg 100°C) instead of U-100 in Example 4 Vc
) and 3 parts by weight of UE-3300 (Tg 50°C) (1 g, 83°C), an ink resin was produced in the same manner.

Example 10 Substitute for U-100 in Example 4 F)K, ENG&)-)
YD-014 (Tg 65℃) 7ii parts and ■ (-10
Ink-line cod was prepared in the same manner using a mixed resin (1g 75°C) consisting of 3 parts by weight of 1-2 (Moshoku Kasei, PMMA, Tg 105°C).

Comparative Example 1 An ink ribbon having the following composition was prepared and printed on one side of capacitor paper with a gravure plate having a line count of 183 lines/inch and a plate depth of 40 μm to produce an ink ribbon.

Comparative Example 2 An ink having the following composition was prepared, and an ink ribbon was produced in the same manner as in Comparative Example 1.

Comparative Example 3 An ink having the following composition was prepared, and an ink wagon was produced in the same manner as in Comparative Example 1.

Ink cartridges according to Examples 1 to 1o above and Comparative Examples 1 to
After applying a 10% solution of stearic acid in ethanol to the surface of the ink ribbon according to 3 so that the coating amount after drying is 0.1 g/m2, it was left at 40°C and 90% RH (relative humidity) for one week. I did a knee song by keeping it. When the ink ribbons subjected to this aging were used to print on photographic paper using a thermal head, the ink ribbons of Examples 1 to 10, which had no dye crystal growth, showed good images as well as those before the kneesong. was formed, but ink IJ according to Comparative Examples 1 to 3 in which crystal growth of the dye occurred.
In the case of Z, roughness, which is thought to be density unevenness due to the influence of crystals, was observed in the halftone area, and color was also developed in areas other than the primary print area, degrading the image quality.

〔Effect of the invention〕

According to the present invention, the glass transition point Tg of the binder resin in the ink ribbon is set to 55° C. or higher, and the main resin is a monomer resin having a bisphenol skeleton. The degree of freedom in selecting the color dye is improved. When Matsumoto prints this ink ribbon on photographic paper, a clear and detailed image can be obtained.

Claims (1)

[Claims] A sublimation transfer type hard copy ink ribbon containing a binder resin and a sublimable dye, wherein the binder resin is mainly composed of a resin having a bisphenol skeleton and has a glass transition point Tg of 55° C. or higher. Ink ribbon for sublimation transfer hard copy.