Heat transfer sheet

• US 5,124,309 A
• Filed: 03/28/1990
• Issued: 06/23/1992
• Est. Priority Date: 03/28/1989
• Status: Expired due to Term

• Current Assignee: Dai Nippon Printing Company Limited
• Original Assignee: Dai Nippon Printing Company Limited
• Inventors: Egashira, Noritaka N. E.
• Primary Examiner(s): Hess, Bruce H.
• Application Number:
  US07/500,124
• Time in Patent Office: 818 Days
• Field of Search: 8/471, 428/195, 428/447, 428/421, 428/422, 428/913, 428/914, 503/227
• US Class Current: 503/227
• CPC Class Codes: B41M 5/392 Additives, other than colour forming substances, dyes or pigments, e.g. sensitisers, transfer promoting agents
• CPC Class Codes: B41M 5/395 Macromolecular additives, e.g. binders
• 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 428/31551 Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane
• CPC Class Codes: Y10T 428/31786 Of polyester [e.g., alkyd, etc.]
• CPC Class Codes: Y10T 428/31855 Of addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31971 Of carbohydrate

Abstract

A heat transfer sheet having a dye layer including a dye and binder, provided on a substrate film, said dye layer contains a compound represented by the following formula (I):

R=[(CH.sub.2).sub.1 --X--(CH.sub.2).sub.m --CH.sub.3 ].sub.2 (I)

wherein R is a phenylene group or a napthylene group or an alkylene group which may also have substituent, X is a linking group such as --NHCOO-- group, --NHCONHN-- group, --COO-- group, --CONH group, --NHCO group, --NHSO₂ -- group, --OOC-- groups, --OOCNH group, --O.O₂ S group--, --SO₂ NH-- group, --SO₂.O group, --O-- group, --NH-- group, --S-- group; and l and m are integers of 1 to 30.

Claims

1. A heat transfer sheet having a dye layer comprising a dye, binder, sensitizer and release agent, provided on a substrate film,

said sensitizer being a low molecular weight substance having a melting point of 50°

to 150°

C.; and

said release agent being a graft copolymer having at least one releasable segment selected from polysiloxane segments, fluorinated carbon segments and long chain alkyl segments graft-bonded to the main chain of the copolymer.

2. A heat transfer sheet according to claim 1, wherein the main chain of the releasable polymer is compatible with the binder.

3. A heat transfer sheet according to claim 1, wherein the main chain of the releasable polymer is an acrylic, vinyl, polyester, polyurethane, polyamide or cellulose resin.

4. A heat transfer sheet according to claim 1, wherein the low molecular weight substance has a molecular weight of 100 to 1,500.

5. A heat transfer sheet according to claim 1, wherein the amount of the low molecular weight substance is 1 to 100 parts by weight per 100 parts by weight of the binder.

6. A heat transfer sheet according to claim 1, wherein the binder has a Tg of 50°

C. or higher.

7. A heat transfer sheet according to claim 1, wherein the surface of the substrate sheet is subjected to a treatment that enhances the adhesiveness of said surface.