Thermal transfer recording medium

Patent metadata

Field	Value
Publication number	US-10675901-B2
Application number	US-201815953696-A
Country	US
Kind code	B2
Filing date	Apr 16, 2018
Priority date	Nov 2, 2015
Publication date	Jun 9, 2020
Grant date	Jun 9, 2020

Abstract

A thermal transfer recording medium that is capable of dealing with the requirement for an increase in thermal transfer printing speed, and high density and high quality of a thermally transferred image, capable of preventing the occurrence of abnormal transfer at high temperature and high humidity, and capable of improving transfer sensitivity in printing. A thermal transfer recording medium includes a heat-resistant lubricating layer on one surface of a base material, and an undercoat layer and a dye layer in that order on the other surface of the base material. The undercoat layer includes a copolymer of a polyester having a sulfonic acid group and an acrylic polymer having at least one of a glycidyl group and a carboxyl group, polyvinylpyrrolidone, and an oxazoline group-containing polymer. A binder resin of the dye layer is an acid-modified polyvinyl acetoacetal resin.

First claim

What is claimed is:

1. A thermal transfer recording medium, comprising:
a heat-resistant lubricating layer on one surface of a base material; and an undercoat layer and a dye layer in that order on the other surface of the base material,
wherein the undercoat layer includes
a copolymer of a polyester having a sulfonic acid group and an acrylic polymer having at least one of a glycidyl group and a carboxyl group, polyvinylpyrrolidone, and
an oxazoline group-containing polymer; and

a binder resin of the dye layer is a carboxyl group-modified polyvinyl acetoacetal resin or an epoxy modified polyvinyl acetoacetal resin.

2. The thermal transfer recording medium of claim 1 , wherein a K value of the polyvinylpyrrolidone in the Fikentscher formula is within the range from 30 to 100 inclusive.

3. The thermal transfer recording medium of claim 1 , wherein the copolymerization ratio of the polyester and the acrylic polymer is within the range from 20:80 to 40:60 by mass ratio.

4. The thermal transfer recording medium of claim 1 , wherein the composition ratio of the copolymer and the polyvinylpyrrolidone is within the range from 70:30 to 30:70 by mass ratio; and the oxazoline group-containing polymer is contained at no less than 5% by mass and no more than 20% by mass with respect to the total amount of the copolymer and the polyvinylpyrrolidone.

5. The thermal transfer recording medium of claim 1 , wherein the mass per unit area of the undercoat layer in the dry state is within the range of no less than 0.05 g/m 2 and no more than 0.30 g/m 2 .

Assignees

• Toppan Printing Co Ltd

Inventors

• Fukunaga Godai

Classifications

• C08G81/02

  at least one of the polymers being obtained by reactions involving only carbon-to-carbon unsaturated bonds · CPC title

• C08F283/02

  on to polycarbonates or saturated polyesters {(C08F283/004 takes precedence)} · CPC title

• B41M2205/38

  Intermediate layers; Layers between substrate and imaging layer · CPC title

• B41M5/395 Primary

  Macromolecular additives, e.g. binders · CPC title

• B41M2205/02

  Dye diffusion thermal transfer printing (D2T2) · CPC title