Heat transfer recording media

• US 5,387,013 A
• Filed: 09/09/1993
• Issued: 02/07/1995
• Est. Priority Date: 01/31/1989
• Status: Expired due to Term

• Current Assignee: Dai Nippon Printing Company Limited
• Original Assignee: Dai Nippon Printing Company Limited
• Inventors: Yamauchi, Mineo, Iwata, Tamami
• Primary Examiner(s): FRIDIE JR, WILLMON
• Application Number:
  US08/118,210
• Time in Patent Office: 516 Days
• Field of Search: 283/85, 283/86, 283/87, 283/91, 283/94, 283/101, 283/107, 283/109, 283/110, 283/901, 283/904
• US Class Current: 283/86
• CPC Class Codes: B32B 2425/00 Cards, e.g. identity cards, credit cards
• CPC Class Codes: B32B 38/14 Printing or colouring
• CPC Class Codes: B41M 3/14 Security printing securities B42D25/29
• CPC Class Codes: B41M 3/142 using chemical colour-formers or chemical reactions, e.g. leuco-dye/acid, photochromes
• 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 5/52 Macromolecular coatings
• CPC Class Codes: B41M 7/0027 using protective coatings or layers by lamination or by fusion of the coatings or layers
• CPC Class Codes: B42D 2035/20 Optical effects
• CPC Class Codes: B42D 2035/24 Colours
• CPC Class Codes: B42D 25/23 Identity cards
• CPC Class Codes: B42D 25/29 Securities; Bank notes
• CPC Class Codes: B42D 25/324 Reliefs
• CPC Class Codes: B42D 25/328 Diffraction gratings; Holograms
• CPC Class Codes: B42D 25/378 Special inks
• CPC Class Codes: B42D 25/382 absorbing or reflecting infrared light
• CPC Class Codes: B42D 25/387 absorbing or reflecting ultraviolet light
• CPC Class Codes: B42D 25/405 Marking
• CPC Class Codes: B42D 25/415 using chemicals B42D25/445 takes precedence
• CPC Class Codes: B42D 25/42 by photographic processes
• CPC Class Codes: B42D 25/47 : using adhesives
• CPC Class Codes: G03H 2250/10 : arranged to be transferred onto a carrier body
• CPC Class Codes: G03H 2250/12 : Special arrangement of layers

Abstract

The present invention relates to a heat transfer recording medium in which a substrate has items of information such as an image and characters formed on a surface thereof by heat transfer and a transparent protective layer is provided on at least a part of the surface of the thus recorded information through an adhesive layer, if required, characterized in that the adhesive layer and/or protective layer function to provide security against counterfeiting. Combining information recorded by heat transfer with a function to provide security against counterfeiting, the present invention provides greater security against falsifying or counterfeiting.

Claims

1. A method for making heat transfer recordings on a substrate comprising heat transferring a first heat transfer image onto a surface of the substrate and transferring a second heat transfer image onto the surface of the substrate simultaneously with, or in superposed relation to, said first heat transfer image.

2. The method of claim 1, wherein said substrate is in the form of a card.

3. A heat transfer image receiving sheet, comprising a hologram sheet provided on at least one major side thereof with a dye receiving layer for receiving a dye for heat transfer.

4. The heat transfer image receiving sheet of claim 3, further comprising an intermediate layer formed between said hologram sheet and said dye receiving layer.

5. The heat transfer image receiving sheet of claim 4, wherein at least one of the hologram sheet, dye receiving layer, and intermediate layer is transparent.

6. The heat transfer image receiving sheet of claim 4, wherein at least one of the hologram sheet, dye receiving layer, and intermediate layer is semi-transparent.

7. The heat transfer image receiving sheet of claim 3, wherein said hologram sheet comprises a support, a hologram forming layer formed on the support, and a holographic effect layer.

8. The heat transfer image receiving sheet of claim 4, wherein said hologram sheet comprises a support, a hologram forming layer formed on the support, and a holographic effect layer.