Thermal transfer sheet

• US 5,573,833 A
• Filed: 03/30/1995
• Issued: 11/12/1996
• Est. Priority Date: 11/29/1990
• Status: Expired due to Term

• Current Assignee: Dai Nippon Printing Company Limited
• Original Assignee: Dai Nippon Printing Company Limited
• Inventors: Kaneko, Hirokazu, Umise, Shigeki, Nakamura, Kouichi, Hayashi, Masafumi, Suto, Kenichiro, Watanabe, Hiromi, Imamura, Hirokatsu
• Primary Examiner(s): HESS, BRUCE H
• Application Number:
  US08/413,268
• Time in Patent Office: 593 Days
• Field of Search: 428/195, 428/211, 428/318.4, 428/913, 428/914, 428/484, 428/488.1, 428/488.4
• US Class Current: 428/32.39
• CPC Class Codes: B41M 5/38214 Structural details, e.g. multilayer systems composition of individual layers B41M5/42
• CPC Class Codes: B41M 5/42 Intermediate, backcoat, or covering layers B41M5/405 takes precedence; multilayer thermal transfer systems in general B41M5/38214
• CPC Class Codes: B41M 5/423 characterised by non-macromolecular compounds, e.g. waxes
• CPC Class Codes: B41M 5/44 characterised by the macromolecular compounds
• CPC Class Codes: Y10S 428/913 Material designed to be responsive to temperature, light, moisture
• CPC Class Codes: Y10S 428/914 Transfer or decalcomania
• CPC Class Codes: Y10T 428/24901 including coloring matter
• CPC Class Codes: Y10T 428/24934 including paper layer
• CPC Class Codes: Y10T 428/249953 Composite having voids in a component [e.g., porous, cellular, etc.]
• CPC Class Codes: Y10T 428/28 Web or sheet containing structurally defined element or component and having an adhesive outermost layer
• CPC Class Codes: Y10T 428/2848 Three or more layers
• CPC Class Codes: Y10T 428/31 Surface property or characteristic of web, sheet or block
• CPC Class Codes: Y10T 428/31855 Of addition polymer from unsaturated monomers

Abstract

A co-winding type thermal transfer sheet is constituted by forming on one surface side of a substrate film a heat-fusible ink layer comprising a pigment and a particulate binder, and causing a tracing paper to be peelably bonded onto the heat-fusible ink layer by the medium of an adhesive layer. The thus constituted co-winding type thermal transfer sheet is capable of providing an original image which can be reproduced by use of a blueprint process so as to provide blueprint images having a high precision and a high contrast.

In addition, a co-winding type thermal transfer sheet may also be constituted by forming a heat-fusible ink layer on one surface side of a substrate film and causing a transparent resin sheet to be peelably bonded onto the heat-fusible ink layer by the medium of an adhesive layer containing a cross-linking agent. The thus constituted co-winding type thermal transfer sheet is capable of providing an image excellent in wear resistance on the transparent resin sheet. The transparent resin sheet after the image formation may be used as an OHP (overhead projector) sheet. without contaminating the sheet having no liquid absorbing property.

Claims

1. A thermal transfer sheet comprising:

a substrate film, one side surface of which is provided with a heat-fusible ink layer, and

a synthetic paper including minute voids and a high smoothness which is peelably bonded to the heat-infusible ink layer by the medium of an adhesive layer wherein the synthetic paper has a smoothness of at least 2000 sec.

2. A thermal transfer sheet according to claim 1, wherein the synthetic paper predominantly comprises a polypropylene resin.

3. A transfer sheet according to claim 1, wherein the synthetic paper has a surface which is to be subjected to a printing operation and has been provided with a printed image in advance.

4. A thermal transfer sheet according to claim 1, wherein the synthetic paper has been subjected to an antistatic treatment.