JPH0292591A - Thermal transfer recording medium - Google Patents

Abstract

PURPOSE:To eliminate the image bleeding and contamination due to the heat of a hot press and to form a transfer image having resistance even to dry cleaning and wear resistance by selecting a methacrylic ester resin as a polymer material used for an ink layer, and providing a hot melt layer on a substrate. CONSTITUTION:The title medium consists of a substrate, a hot melt layer, and a thermal transfer ink layer. As the substrate, a plastic film of the order of 3-10mum thickness can be used ; for example, a polyester film, a polycarbonate film, and polyimide film. The ink layer is mainly composed of a homopolymer of alkyl methacrylate, a copolymer of alkyl methacrylate with each other, or a copolymer of alkyl methacrylate with another monomer and a coloring agent. As the copolymer of alkyl methacrylate with another monomer, a copoly mer of alkyl methacrylate with vinyl chloride, vinylidene chloride, or ethylene can be exemplified. The hot melt layer to be provided between the substrate and the thermal transfer ink layer is mainly composed of a hot melt substance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a heat-sensitive transfer recording medium suitable for thermal transfer ribbons or clothing labels.

[Prior Art] Conventionally, as an ink layer of a thermal transfer recording medium, an ink layer containing an emulsified resin with a minimum film forming temperature of 40° C. or higher has been whitened (Japanese Patent Application Laid-Open No. 6357679): styrene/methyl. The main component is methacrylate 1/butyl acrylate copolymer (Japanese Patent Application Laid-Open No. 82-23779)
No.): Styrene/methacrylic ester copolymer laminated on a transparent protective layer made of a mixture of styrene/methacrylic ester copolymer and polyvinyl chloride resin.
An ink layer consisting of a mixture of polymethacrylate/polyvinyl chloride resin and a coloring agent (Japanese Patent Application Laid-Open No. 2002-02-
No. 179992); having an ink layer made of a mixture of a (meth)acrylic acid ester polymer and a colorant laminated on a transparent protective layer made of a chlorinated polyolefin resin (Japanese Patent Application Laid-open No. 03-42891) etc.

[Problems to be Solved by the Invention] However, when these conventional ink layers are used for labels for clothing, etc., they have the drawback that image bleeding and staining occur due to dry cleaning solvents and heat from hot pressing.

That is, in JP-A-03-57679, resins with a minimum film-forming temperature of 40°C or higher do not necessarily have good heat resistance;
Blocking, image smearing, and staining occur at temperatures around 00°C. Furthermore, emulsions of high Tg resins such as polymethyl methacrylate have a high minimum film forming temperature and are inferior in thermal sensitivity. Furthermore, if a wax is used as a binder, it will fall off during dry cleaning and cannot be used for clothing labels. In JP-A No. 62-23779, when styrene or acrylate is included in the copolymerization components, they tend to come off during dry cleaning. In JP-A-82-17992, when styrene is included in the copolymerization component, it easily comes off during dry cleaning, and even when mixed with polymethyl methacrylate, there is no significant improvement. Furthermore, in JP-A No. 63-42891, the acrylic ester copolymer easily comes off during dry cleaning, and the methacrylic ester alone has poor thermal sensitivity. Also, since chlorinated polyolefin is used for the protective layer, it is not suitable for dry cleaning.

The present invention has been developed in view of these circumstances, and is capable of forming a transfer image that is resistant to dry cleaning, does not cause image bleeding or staining due to the heat of hot press, and is wear-resistant. Its purpose is to provide recording media.

[Means for solving the problem] The inventors have been conducting research to solve the above problem, but as a polymer material used for the ink layer,
It has been found that it is effective to select a methacrylic acid ester resin and provide a heat-fusible layer on the support, leading to the present invention.

That is, the present invention has a thermally transferable ink layer containing a colorant as a main component and a homopolymer of alkyl methacrylate or a copolymer of alkyl methacrylates on a support, and the thermally transferable ink layer and the support have a A thermal transfer recording medium having a heat-fusible layer therebetween; (2) a color obtained by copolymer comprising at least one of vinyl chloride, vinylidene chloride, and ethylene and at least one alkyl methacrylate on a support; This is a thermal transfer recording medium which has a thermal transfer ink layer which is mainly composed of a gold-plated agent and which has a heat-melting layer between the thermal transfer ink layer and a support.

The thermal transfer recording medium of the present invention is composed of a support, a heat-fusible layer, and a heat-transferable ink layer.

The support used in the present invention is a plastic film with a thickness of about 3 to 10 μm, such as polyester film, polycarbonate film, polyimide film, wholly aromatic polyamide film, polyether ether ketone film, polysulfone film, etc. Can be done.

The ink layer used in the present invention is mainly composed of an alkyl methacrylate homopolymer, a 1-alkyl methacrylate copolymer, or a copolymer of alkyl methacrylate and another monomer, and a colorant. be.

Examples of the above-mentioned alkyl acrylate polymers or copolymers include polymethyl methacrylate, polyethyl methacrylate, polyn-propyl methacrylate, polyisopropyl methacrylate, poly-lobyl methacrylate, polyisobutyl methacrylate, polytar
Examples include t-butyl methacrylate, polyoctyl methacrylate, polyoctyl methacrylate, and copolymers of two or more of these monomer components.

In addition, other copolymers of alkyl methacrylate include:
Copolymers of alkyl methacrylate and vinyl chloride, vinylidene chloride or ethylene can be mentioned.

The copolymerization ratio of alkyl methacrylate and these monomers is preferably 50:50 to 90:10.

These polymers or copolymers can be used alone or in combination of two or more.

As other colorants, pigments and dyes such as carbon black, titanium dioxide, red iron oxide, Lake Red C1 Fast Sky Blue, benzidine yellow, phthalocyanine green, phthalocyanine blue, direct dyes, oil dyes, and basic dyes can be used. It is preferable to add about 96% by weight of D to 20 to the entire ink layer.

The heat-melting layer provided between the support and the heat-transferable ink layer is
The main component is a heat-melting substance.

As the heat-melting substance, carnauba wax, candelilla wax, paraffin wax, rice wax, microcrystalline wax, ceresin wax, ceresin wax, polyethylene wax, stearic acid and its derivatives, etc. can be used. The adhesion amount of this heat-fusible layer is about 0.1 to 3μ, and the ink layer is about 1 to 5μ.
It is preferably about μ.

[Example] Hereinafter, the present invention will be explained in more detail with reference to Examples.

Example 1 The following composition solution was applied onto a 4.5 μm polyester film to provide a heat-fusible layer with a thickness of 1 μm.

carnauba wax 10 parts toluene
90 parts (dispersed in a ball mill for 24 hours) An ink liquid having the following composition was applied thereon to form an ink layer with a thickness of 4 μm.

Ethyl methacrylate resin 20 parts Carbon black 4 parts Methyl ethyl ketone
76 parts (dispersed in a ball mill for 24 hours) Example 2 A 4-μ thick sheet was prepared in the same manner as in Example 1 except that methyl methacrylate-1/n-butyl methacrylate-1 copolymer was used instead of the ethyl methacrylate resin. An ink layer was provided.

Example 3 An ink liquid having the following composition was applied onto the heat-fusible layer of Example 1 to provide an ink layer with a thickness of 4 μm.

Ethyl methacrylate/n-butyl methacrylate copolymer emulsion (solid content 50%) 20 parts 10% polyvinyl alcohol aqueous solution 10 parts Carbon black dispersion (SD 9020 manufactured by Dai IJ Hon Ink Co., Ltd.) 2.5
Section Example 4 In place of the ethyl methacrylate/n-butyl methacrylate copolymer emulsion of Example 3, an ethyl methacrylate/vinyl chloride copolymer emulsion (Ii'i'I type 5) was used.
An ink layer having a thickness of 4 μm was provided in the same manner as in Example 3 except that 0%) was used.

Example 5 In place of the ethyl methacrylate/n-butyl methacrylate copolymer emulsion of Example 3, an ethyl methacrylate/vinylidene chloride copolymer emulsion (solid content 5
An ink layer having a thickness of 4 μm was provided in the same manner as in Example 3 except that 096) was used.

Example 6 Ethyl methacrylate/ethylene copolymer emulsion (solid content 50%) was used instead of the ethyl methacrylate/n-butyl methacrylate copolymer emulsion of Example 3.
An ink layer having a thickness of 4 μm was provided in the same manner as in Example 3, except that the ink layer was used.

Comparative Example 1 In Example 1, an ink layer was provided directly on a polyester film without providing a heat-fusible layer.

Comparative Example 2 An ink layer having a thickness of 4 μm was provided in the same manner as in Example 1, except that methyl acrylate resin was used instead of ethyl methacrylate resin in Example 1.

Comparative Example 3 Ethyl methacrylate/styrene copolymer emulsion (solid content 50%) was used instead of the ethyl methacrylate/n-butyl methacrylate copolymer emulsion of Example 3.
An ink layer having a thickness of 4 μm was provided in the same manner as in Example 3, except that the ink layer was used.

Furthermore, in each of the Examples and Comparative Examples, the following composition liquid was applied to the opposite side of the support to the side on which the ink layer was provided, to provide a stake prevention layer having a thickness of 0° to 1 μm.

Silicone rubber (30%) 10 parts Toluene 90 parts Hardening agent
A thermal transfer printer (line type head, applied energy L (1-25 mj/Ili
), printing was performed on each transfer sheet as shown in the table below, and the following tests were conducted.

Dry cleaning test (JIS 1.0860) Hot press test (JIS!, 0850) Friction test (
JIS L 0849) The results are shown in the following table.

[Note] Good: No change Bad 2 Unreadable due to image falling off or blurring i+J [Effects of the Invention] As explained above, according to the structure of the present invention, hot press resistance, dry cleaning resistance, and abrasion resistance are achieved. A thermal transfer recording medium that forms transferred images with excellent quality? 1;
can be done.

Claims (2)

[Claims] (1) A thermally transferable ink layer containing an alkyl methacrylate homopolymer or a copolymer of alkyl methacrylates and a colorant as main components on a support, and between the thermally transferable ink layer and the support. A thermal transfer recording medium characterized by having a heat-fusible layer. (2) A thermally transferable ink layer containing mainly a colorant and a copolymer of at least one of vinyl chloride, vinylidene chloride, and ethylene and at least one alkyl methacrylate is provided on the support. A thermal transfer recording medium comprising: a thermally transferable ink layer and a thermally meltable layer between the thermally transferable ink layer and a support.