JPS6040294A - Thermal transfer film - Google Patents

Abstract

PURPOSE:To enable to transfer images multiple times, by a method wherein a film of a polymer having active hydrogen in its molecule is provided between a base film and an ink layer, in a thermal transfer film comprising a heat-fusible ink layer on a base film. CONSTITUTION:On a heat-resistant thin base film such as a polyester film or capacitor paper, a film of a polymer having active hydrogen in its molecule is provided by thermally melting the polymer or applying an appropriate solution of the polymer. It is required that the polymer film must not be melted or released from the base film at the time of thermal transfer. Active hydrogen is preferably in the form of a hydroxyl group, a carboxyl group or the like. The polymer may be, for example, an ethylene-vinyl alcohol copolymer or polyvinyl alcohol. Then, the heat-fusible ink layer comprising a low melting point resin, a coloring agent or the like is provided on the polymer film to obtain the objective thermal transfer film.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applicable to standard thermal transfer films used in thermal transfer recording type printers and Fakunmi+).

A thermal transfer recording method is one of the recording methods used in printers and facsimile machines. In this case, the heat transfer film has two heat bath melting ink layers on the base film, and the back force of the heat transfer film from the heat sensitive head is applied to the transfer paper such as plain paper.
Heat bath melted ink (hereinafter referred to as F ink) is used for recording by transferring it to the transfer paper.

Since the conventional thermal transfer film rJ flat ZM material film is only provided with an ink layer r consisting of a binder and a coloring agent5, it has the following drawbacks.
In other words, the VC is completely transferred without leaving any residue on the ink layer or the material film of the recording section in one transfer, so it is a so-called one-time product that can only be used more than once, and the recording cost is high.

And the drawbacks of thermal transfer film, such as the same or more time and effort required, are the same. So, why should non-inventors address the above-mentioned drawbacks? As a result of our extensive efforts to eliminate this problem, we created a transfer film by providing a layer of VCM molecules in active hydrogen molecules between the base film and the ink layer. We have discovered a new fact that it is possible to do this several times, and have finally completed the present invention. In other words, the non-invention is that the ink that has been thermally melted by zero heat from the thermal head is temporarily transferred and remains on the base film, making it possible to perform multiple transfers. The base film used in the present invention is a heat-resistant film having a thickness of 1.0 to 20 μm, such as stretched polyester or polyamideimide. , glass films such as polyimide, or papers such as capacitor paper and glassine paper are used. If the thickness is less than 1.0 μm, the printing energy will be too high. It's not a mediocre thing.

The base film is coated with active hydrogen in the molecules by heat melting the molecular film or as a suitable solution to a thickness of 0.01 to 3 μm in solid content in a Jb-like manner. As a result, it is possible to put the polymer film layer on the base film.
In addition, it is necessary that the film does not peel off from the base film.

As the active hydrogen, hydroxyl group, amide group, carboxyl group, etc. are preferred. As for the polymer, ethylene-vinyl acetate copolymer Xo integrally partially saponified product, ethylene-vinyl acetate copolymer fully saponified product (ethylene-vinyl acetate copolymer fully saponified product) (vinyl alcohol copolymer), polyvinyl alcohol, cellulose partially etherified rosin acid phenol, Yayu polyamide joseki, ethylene-acrylic acid co-merite, ethylene-acrylic acid metal salt co-mer, chikara, lupoxymethyl cellulose , rosin,
Examples include chlorinated vinyl, vinegar, and maleic acid. Further, it is also possible to carry out appropriate crosslinking depending on necessity. Examples of such crosslinking agents include polyincyanate, melamine resin, urea position I fat, and polyamine (when the crosslinking point is carboxyl group). Multi-face transfer is not possible, and a thickness of 1 μm or more is not a good idea, as the effect will not change if the thickness is 3 μm or more.

Next, the ink layer prepared in advance is coated on the cough polymer film in a hot bath melting state or in a state in which it is dispersed in a bath medium, thereby creating a heat transfer film.

This ink is made with a low melting point resin and 5 colorants.

It must consist of a 1-year grade softener according to Jk&.

Low-melting point oils include paraffin wax, microcrystalline wax, carnauba wax, ceresin wax, oxidized wax, ester wax, polyethylene wax, and other natural waxes and synthetic waxes; colorants include carbon black, M pigments, and inorganic pigments. , dyes, etc. Also, as softeners, room temperature liquids such as plasticizers and oils are used.

It is preferable that the low melting point resin is 60 to 95M Dobe, the colorant is 5 to 40M, and the softener is 0 to 20M. If the coloring agent is more than 40 parts of the ink, the quantitative transfer to the paper will be poor, and if it is less than 5'1iilf1111, the print density will be low.If the softener is more than 20 parts of the ink, the printing will be sticky. The thickness of the ink layer is preferably 2 to 20 am.

When the thickness is less than 2 μm, the print density decreases from the second time onwards.

If the thickness is 20 μm or more, a large amount of ink printing energy is required. If you print with a thermal printer using the thermal transfer film T1 invented by Power and Light, the ink layer will not be transferred all at once and can be used multiple times. It is. In this case, the active hydrogen in the polymer membrane layer interacts with a small amount of polar groups such as the 1N filtered water rR group or carboxyl ester group contained in the low melting point resin and colorant, and the ink layer is completely removed at once. This is thought to be due to interference with the transfer.

Next, the present invention will be further illustrated by examples. Note that the parts indicated are all M-shaped parts. Example 1 A stretched polyester film with a thickness of 9 μm was used as a base film, and a partially saponified ethylene-vinyl acetate co-electrolyte (Japanese Synthetic Chemical Co., Ltd. Hot methanol solution of Gohsenol GL-03)? Coated. The thickness of the polymer membrane layer after drying was approximately 1.0 μm.

Next, on top of the polymer membrane layer,
40 parts, carnauba wax 20g, paraffin wax 20 parts, carbon black 2° ViIS mixed ink was melted and coated with VC to a thickness of 10 ttm, an inventive thermal transfer film? Obtained.

Example 2 10 μm thick condenser paper? As a 4-material film,
On top of this, polyamide resin (Toshi & l: Soluble nylon c)
M4. ooo) methanol/water mixed liquid coating π0
The thickness of Yasutoshi Inui's molecular film layer was about 1.0 μm″T: very small.

Next, apply ester wax 40 on top of the sword/kainao molecular film layer.
An ink containing 20 parts of carnauba wax, 10 parts of dioctyl phthalate, and 420 parts of carbon bluff was melted and coated with 10 μm thick + VC to obtain a thermal transfer film.

Comparative Example 1 Stretched polyester film with a thickness of 9 μm A KLI material film was coated with ink mixed with 40 parts of ester wax, 20 parts of carnauba wax, 20 parts of paraffin wax, and 20 parts of carbon black.
A heat transfer film was obtained by coating the thick awn with soil.

Examples 1, 2 and comparison? Is it especially possible to load thermal transfer film into a thermal printer at 11? Transfer was applied multiple times as a transfer paper. In the introduction table 1, there is 7F, 0. Is the bot result printed in table 1 hidden? Expressed in terms of reflection strength, this number 11) Does this mean that the thicker i is, the thicker the printing is? It shows.

Table 1 Number of transfers and printing speed As shown in the example in Table 1, the uninvented product can be printed multiple times. A polymer layer containing active hydrogen in the molecules between the material film and the ink layer? This was made possible only after it was established.

Claims (1)

[Claims] 1. In a heat-sensitive transfer film comprising a heat-fusible ink layer provided on a base film, is there a polymer film island between the base film and the heat-fusible ink layer in the form of VC oil-based hydrogen ligation molecules?
We have provided special features and features for thermal transfer film.