Thermal transfer film for protective layer and print

• US 5,928,989 A
• Filed: 01/30/1997
• Issued: 07/27/1999
• Est. Priority Date: 06/01/1995
• Status: Expired due to Term

• Current Assignee: Dai Nippon Printing Company Limited
• Original Assignee: Dai Nippon Printing Company Limited
• Inventors: Oshima, Katsuyuki, Tatehana, Atsushi, Ohnishi, Jiro, Kudo, Mikiko
• Primary Examiner(s): Hess, Bruce H.
• Application Number:
  US08/776,315
• Time in Patent Office: 908 Days
• Field of Search: 8/471, 428/195, 428/323, 428/447, 428/913, 428/914, 428/206, 428/304.4, 503/227
• US Class Current: 503/227
• CPC Class Codes: B41M 5/38264 Overprinting of thermal transfer images
• CPC Class Codes: B41M 7/0027 using protective coatings or layers by lamination or by fusion of the coatings or layers
• 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 428/24802 Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
• CPC Class Codes: Y10T 428/24893 including particulate material
• CPC Class Codes: Y10T 428/249953 Composite having voids in a component [e.g., porous, cellular, etc.]

Abstract

In order to enable stamping or writing with an aqueous ink on a print with a colorant image or the like formed thereon and, at the same time, to impart fastness properties, such as weather resistance, chemical resistance, and solvent resistance to the print, there are provided a thermal transfer film for a protective layer, which, upon transfer on a print, can form a protective layer having a water-absorptive property and the above fastness, and a print with a protective layer transferred from the above transfer film.

The thermal transfer film for a protective layer basically comprises a heat-resistant substrate film and a thermally transferable protective layer laminated thereto. The thermally transferable protective layer is thermally separated from the substrate and laminated on a print with a colorant image.

Claims

1. A thermal transfer film for a protective layer, comprising:

a heat-resistant substrate film; and

a thermally transferable protective layer provided on the heat-resistant substrate film,

the protective layer comprising (a) a substantially transparent, water-absorptive surface layer comprising dispersed particles and a resin and (b) an outermost heat-sensitive resin layer.

2. The thermal transfer film for a protective layer according to claim 1, wherein the water-absorptive surface layer constitutes, upon transfer of the thermally transferable protective layer, the outermost surface and comprises a substantially transparent porous layer.

3. The thermal transfer film for a protective layer according to claim 1, wherein the water-absorptive surface layer adapted to form the outermost surface after transfer of the thermally transferable protective layer comprises at least a partially water-absorptive layer comprising a water-absorptive area and a water-resistant area.

4. The thermal transfer film for a protective layer according to claim 3, wherein the water-absorptive area comprises a resin comprising at least both a water-soluble resin and a water-insoluble resin.

5. The thermal transfer film for a protective layer according to claim 3, wherein the substantially transparent porous layer or water-resistant area is formed of a material composed mainly of fine particles having an average particle diameter of not more than 0.1 μ

m.

6. The thermal transfer film for a protective layer according to claim 3, wherein the material constituting the substantially transparent porous layer or water-resistant area comprises a water-resistant resin binder.

7. The thermal transfer film for a protective layer according to claim 1, wherein the thermally transferable protective layer comprises an ultraviolet absorbing material.

8. The thermal transfer film for a protective layer according to claim 1, wherein the thermally transferable protective layer and at least one of a thermally sublimable colorant layer and a hot-melt colorant layer are provided in a face serial manner on an identical substrate film.

9. A print comprising a colorant image, the thermally transferable protective layer according to claim 1 having been thermally transferred and laminated onto at least part of an image-forming face to form a protective layer.

10. The print according to claim 9, with a stamp of an aqueous ink affixed thereon.