Transfer foil, security laminate, and security laminate production method

Patent metadata

Field	Value
Publication number	US-10675840-B2
Application number	US-201916379383-A
Country	US
Kind code	B2
Filing date	Apr 9, 2019
Priority date	Oct 12, 2016
Publication date	Jun 9, 2020
Grant date	Jun 9, 2020

Abstract

A transfer foil comprises a film-like substrate, and a layered transfer body having a pair of opposing surfaces and having an adhesion layer. A first surface of the pair of opposing surfaces is in contact with the substrate so as to be peelable from the substrate, and the adhesion layer is provided so as to include a second surface of the pair of opposing surfaces. The adhesion layer is a composite, and comprises a plurality of resin particles respectively comprising a first resin, and a layered base material comprising a second resin and filling gaps between the resin particles. The melting point of the second resin is lower than the melting point of the first resin. The transfer foil uses an adhesion layer of a composite of two incompatible resins that have different characteristics, such as melting point and crystallinity.

First claim

What is claimed is:

1. A transfer foil, comprising:
a film-like substrate, and
a layered transfer body having a pair of opposing surfaces and having an adhesion layer;
wherein a first surface of the pair of opposing surfaces is in contact with the substrate so as to be peelable from the substrate, and the adhesion layer is provided so as to include a second surface of the pair of opposing surfaces,
wherein the adhesion layer is a composite, and comprises a plurality of resin particles respectively comprising a first resin, and a layered base material comprising a second resin and filling gaps between the resin particles, and
wherein the melting point of the second resin is lower than the melting point of the first resin, and,
wherein the first resin is at least one of modified polyolefin, crystalline polyester, and an ethylene-vinyl acetate copolymer, and
the second resin is at least one of an acrylic resin, non-crystalline polyester, and a vinyl acetate-vinyl chloride copolymer.

2. The transfer foil of claim 1 , wherein:
the first resin is modified polyolefin or crystalline polyester, and
the second resin is an acrylic resin.

3. The transfer foil of claim 1 , wherein:
the first resin is crystalline polyester, and
the second resin is an acrylic resin.

4. The transfer foil of claim 1 , wherein:
the first resin is a crystalline resin, and
the second resin is a non-crystalline resin.

5. The transfer foil of claim 1 , wherein:
the transfer body contains a relief surface with unevenness, and contains a relief layer constituted from an ultraviolet-curing resin and an organosilicon compound.

6. The transfer foil of claim 5 , wherein:
the transfer body comprises a reflective layer,
the reflective layer covers at least part of the relief surface, and is constituted from aluminum or zinc sulfide, and
the organosilicon compound contains an amino group.

7. The transfer foil of claim 5 , wherein:
the transfer body comprises a reflective layer,
the reflective layer covers at least part of the relief surface, and is constituted from aluminum or titanium dioxide, and
the organosilicon compound contains an acrylic group or a methacrylic group.

8. The transfer foil of claim 5 , wherein:
the relief layer has a melting point of 180° C. or more.

9. A security laminate comprising:
a first laminate material,
a second laminate material, and
the transfer body of claim 1 ;
wherein the transfer body is positioned between the first laminate material and the second laminate material.

10. A method for producing a security laminate, the method comprising:
forming a transfer foil comprising a film-like substrate and a transfer body, the substrate having a support surface, the transfer body containing an adhesion layer, and the adhesion layer being formed on the support surface;
transferring the transfer body to a first laminate material; and
bonding the first laminate material and a second laminate material while the transfer body is sandwiched between the first laminate material and the second laminate material;
wherein the adhesion layer is a composite, and comprises a plurality of resin particles respectively comprising a first resin, and a layered base material comprising a second resin and filling gaps between the resin particles, and
the melting point of the second resin is lower than the melting point of the first resin, and,
wherein the first resin is at least one of modified polyolefin, crystalline polyester, and an ethylene-vinyl acetate copolymer, and
the second resin is at least one of an acrylic resin, non-crystalline polyester, and a vinyl acetate-vinyl chloride copolymer.

Assignees

• Toppan Printing Co Ltd

Inventors

• Minamikawa Naoki

Classifications

• B32B7/12

  using interposed adhesives or interposed materials with bonding properties · CPC title

• B32B2425/00

  Cards, e.g. identity cards, credit cards · CPC title

• B32B27/00

  Layered products comprising {a layer of} synthetic resin {(fibrous or filamentary layer made of a synthetic resin B32B5/02; particulate layer made of a synthetic resin B32B5/16; foamed layer made of a synthetic resin B32B5/18)} · CPC title

• B32B2307/30

  having particular thermal properties · CPC title

• B42D25/45

  Associating two or more layers · CPC title