Thermal transfer sheet

Patent metadata

Field	Value
Publication number	US-10569588-B2
Application number	US-201616064147-A
Country	US
Kind code	B2
Filing date	Dec 22, 2016
Priority date	Dec 25, 2015
Publication date	Feb 25, 2020
Grant date	Feb 25, 2020

Abstract

A thermal transfer sheet, which includes a transfer layer, is superposed on a transfer receiving article, and while the transfer layer is continuously transferred onto the article by a printer comprising a sheet supplying device, heating device, sheet winding device, measuring device located between the heating and sheet winding devices to measure the tensile strength of the thermal transfer sheet conveyed along a conveyance path, and release device located between the heating and the measuring devices, under conditions including an applied power for printing: 0.15 W/dot and a conveying speed for the thermal transfer sheet: 84.6 mm/sec., the transfer layer transferred on the article is released from a constituent member in contact with the transfer layer of the thermal transfer sheet, has a tensile strength measured by the measuring device of 0.1 N/cm or less.

First claim

The invention claimed is:

1. A thermal transfer sheet comprising a transfer layer provided on one surface of a substrate,
wherein the transfer layer includes one or two or more layers,
wherein among the layers constituting the transfer layer, a layer located nearest the substrate comprises (1) a homopolymer of isobutyl (meth)acrylate or (2) a copolymer having a copolymerization ratio of isobutyl (meth)acrylate of 30 mol % or more on a molar basis, and
wherein a content of the homopolymer of isobutyl (meth)acrylate or the copolymer having the copolymerization ratio of isobutyl (meth)acrylate of 30 mol % or more is equal to or more than 50 mass % with respect to a total mass of the layer located nearest the substrate.

2. A thermal transfer sheet including a transfer layer provided on one surface of a substrate,
wherein the transfer layer includes one or two or more layers,
wherein among the layers constituting the transfer layer, the layer located nearest the substrate comprises a copolymer of methyl (meth)acrylate and ethyl (meth)acrylate,
wherein the copolymerization ratio of methyl (meth)acrylate in the copolymer is 60% or more and 90% or less on a molar basis, the copolymerization ratio of ethyl (meth)acrylate is 10% or more and 40% or less on a molar basis,
wherein when the copolymerization ratio of the methyl (meth)acrylate in the copolymer is 80% or more on a molar basis, the weight average molecular weight (Mw) of the copolymer is 15000 or less, and
wherein when the copolymerization ratio of the methyl (meth)acrylate in the copolymer is less than 80% or less on a molar basis, the weight average molecular weight (Mw) of the copolymer is 45000 or less.

Assignees

• Dainippon Printing Co Ltd

Inventors

• Oota Mitsuhiro

Classifications

• B41M5/38257

  characterised by the use of an intermediate receptor · CPC title

• B41M5/38214 Primary

  Structural details, e.g. multilayer systems (composition of individual layers B41M5/42) · CPC title

• B41J31/00

  Ink ribbons; Renovating or testing ink ribbons · CPC title

• B41M2205/30

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

• B32B37/26

  with at least one layer which influences the bonding during the lamination process, e.g. release layers or pressure equalising layers · CPC title