Thermal transfer sheet, coating liquid for colorant layer, method for manufacturing thermal transfer sheet, and image forming method

Patent metadata

Field	Value
Publication number	US-9764580-B2
Application number	US-201414781221-A
Country	US
Kind code	B2
Filing date	Mar 28, 2014
Priority date	Mar 29, 2013
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

The purpose of the present invention is to provide a thermal transfer sheet which can prevent a kick and a scumming, and can form a photographic tone color image of high quality with a continuous tone image by sublimation transfer, while expanding the range of choices for colorants to be included in a colorant layer; a coating liquid for colorant layer to be used for forming the colorant layer of this thermal transfer sheet; a method for manufacturing this thermal transfer sheet; and image forming method employing this thermal transfer sheet. The problem is solved by a thermal transfer sheet ( 1 ) in which at least a colorant layer ( 3 ) is layered on a substrate sheet ( 2 ), wherein the colorant layer ( 3 ) contains a predetermined solvent, a colorant ( 10 x ) dispersible in the predetermined solvent, a dispersant, and a binder resin, and the dispersant being one or more selected from the group consisting of polyether-based dispersants, graft type polymer dispersants, acryl-based block type polymer dispersants, urethane-based polymer dispersants and azo-based dispersants.

First claim

The invention claimed is:

1. A thermal transfer sheet comprising:
a substrate and a colorant layer provided on one surface of the substrate sheet,
the colorant layer containing a solvent as a trace, a colorant dispersible in the solvent, a dispersant and a binder resin; and
the dispersant being selected from the group consisting of polyether-based dispersants, graft type polymer dispersants, acryl-based block type polymer dispersants, urethane-based polymer dispersants and azo-based dispersants,
wherein the colorant comprises a quinophthalone-based colorant represented by the following formula 1:

wherein, X represents a hydrogen atom or a halogen atom, R 1 represents a hydrogen atom, an alkyl group or derivative thereof having 1 to 5 carbon atoms, an acyl group including an alkyl group or a benzoic ring and having a total carbon number of 6 to 10; and
wherein the colorant layer further contains another colorant represented by the following formula 2:

wherein, each of R 1 - R 5 represents independently a hydrogen atom, or a sulfonated derivative having at least one sulfonic acid group (—SO 3 H) or sulfonamide group.

Assignees

• Dainippon Printing Co Ltd

Inventors

• Yoshida Kazuya
• Segawa Hiroaki
• IMODA Tomohiko
• Kobayashi Yoshimasa
• Suzuki Tomoko
• Hasegawa Hiroyuki
• Sakamoto Kano

Classifications

• B41M2205/38

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

• C08L71/02

  Polyalkylene oxides · CPC title

• B41M2205/30

  Thermal donors, e.g. thermal ribbons · CPC title

• C08L71/00

  Compositions of polyethers obtained by reactions forming an ether link in the main chain (of polyacetals C08L59/00; of epoxy resins C08L63/00; of polythioether-ethers C08L81/02; of polyether-sulfones C08L81/06); Compositions of derivatives of such polymers · CPC title

• B41M2205/36

  Backcoats; Back layers · CPC title