Thermal transfer sheet, method for producing decorated article and decorated article

Patent metadata

Field	Value
Publication number	US-10792889-B2
Application number	US-201815920507-A
Country	US
Kind code	B2
Filing date	Mar 14, 2018
Priority date	Mar 21, 2017
Publication date	Oct 6, 2020
Grant date	Oct 6, 2020

Abstract

A thermal transfer sheet includes a support film and a transfer layer provided on one surface of the support film. The transfer layer at least includes a decorative layer and an adhesive layer provided on an obverse side of the decorative layer. The adhesive layer includes a first adhesive layer and a second adhesive layer laminated on the first adhesive layer. The first adhesive layer is positioned on an obverse side of the second adhesive layer. The first adhesive layer is made of a first resin having thermal plasticity and has a lower viscosity than the second adhesive layer. The second adhesive layer is made of a second resin having thermal plasticity and has a higher glass-transition point than the first adhesive layer. Monomer units constituting the first resin and monomer units constituting the second resin are partly or entirely identical.

First claim

The invention claimed is:

1. A thermal transfer sheet comprising a support film and a transfer layer provided on one surface of the support film, wherein
the transfer layer at least includes a decorative layer and an adhesive layer provided on an obverse side of the decorative layer,
the adhesive layer includes a first adhesive layer and a second adhesive layer laminated on the first adhesive layer, the first adhesive layer being positioned on an obverse side of the second adhesive layer,
the first adhesive layer is made of a first resin having thermal plasticity and has a lower viscosity than the second adhesive layer,
the second adhesive layer is made of a second resin having thermal plasticity and has a higher glass-transition point than the first adhesive layer, and
monomer units constituting the first resin and monomer units constituting the second resin are partly or entirely identical.

2. The thermal transfer sheet according to claim 1 , wherein at least one of the first adhesive layer and the second adhesive layer contains a filler.

3. The thermal transfer sheet according to claim 1 , wherein the second adhesive layer is thicker than the first adhesive layer.

4. A method for producing a decorated article that includes a substrate, an adhesive layer, and a decorative layer, the adhesive layer and the decorative layer being sequentially laminated on the substrate, the method comprising:
disposing the thermal transfer sheet according to claim 1 on the substrate such that the adhesive layer of the thermal transfer sheet is in contact with the substrate;
conducting thermal transfer processing to transfer the transfer layer to the substrate; and
removing the support film of the thermal transfer sheet.

5. A decorated article comprising a substrate, an adhesive layer, and a decorative layer, the adhesive layer and the decorative layer being sequentially laminated on the substrate, wherein
the adhesive layer contains a first resin and a second resin that have thermal plasticity,
the first resin and the second resin are mixed in the adhesive layer such that a ratio of the first resin increases and a ratio of the second resin decreases toward the substrate in a thickness direction of the adhesive layer,
monomer units constituting the first resin and monomer units constituting the second resin are partly or entirely identical,
the first resin has a lower viscosity than the second resin, and
the second resin has a higher glass-transition point than the first resin.

6. The decorated article according to claim 5 , wherein the adhesive layer contains a filler.

Assignees

• Toyoda Gosei Kk

Inventors

• Kuno Koji
• Suzuki Tsuyoshi
• Utsumi Ryohei
• Soma Yukiyoshi
• Miyachi Daisuke

Classifications

• B32B7/027 Primary

  Thermal properties · CPC title

• B32B27/32

  comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} · CPC title

• B32B7/06

  permitting easy separation · CPC title

• B32B27/283

  comprising polysiloxanes · CPC title

• B32B27/304

  comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF · CPC title