Topcoat with matte surface finish
AssigneeEntrust Datacard Corporation
InventorsUtpal VAIDYA, Roman KNIPP
Life of this patent
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Abstract
A topcoat layer that has a defined surface structure on an outer surface thereof once the topcoat layer is laminated to a substrate. The surface structure of the topcoat layer provides a matte surface finish to the underlying substrate. Any attempt to alter the substrate or the topcoat layer will result in disruption or destruction of the surface structure of the topcoat layer making such tampering evident. Replication of the surface structure of the topcoat layer by a counterfeiter is also difficult without the appropriate equipment.
Claims19
A topcoat film supply, comprising:
- a base film having a first surface, the first surface is intentionally formed to have a surface structure with a desired topography having an average roughness of at least about 0.15 micron;
- and
- a radiation curable coating disposed on the first surface of the base film, the coating having an inner surface facing the first surface, the inner surface has a surface structure that is a mirror image of the surface structure of the first surface.
A topcoat layer, comprising:
- a radiation curable composition having an inner surface that, when the topcoat layer is laminated to a substrate, faces the substrate and an outer surface that, when the topcoat layer is laminated to the substrate, faces away from the substrate;
- the radiation curable composition includes:
- (a) polymerizable composition comprising hard and flexible polymerizable subunits, wherein (i) the hard subunit comprises alkoxylated trimethylolpropane triacrylate with a degree of alkoxylation ranging from about 1 to about 10;
- (ii) the flexible subunit comprises alkoxylated trimethylolpropane triacrylate with a degree of alkoxylation ranging from about 10 to about 20;
- and (iii) the ratio of hard to flexible subunits in the composition is from about 1.5:1 to about 4:1;
- and
- (b) polymeric binder;
- and the outer surface has a surface structure with a desired topography having an average roughness of at least about 0.15 micron.
An identification document, comprising:
- an identification document substrate having printed data thereon and an upper surface;
- a topcoat layer laminated to the upper surface of the identification document substrate, the topcoat layer has an outer surface that faces away from the upper surface and that has a surface structure with a desired topography having an average roughness of at least about 0.15 micron;
- the topcoat layer is formed by a topcoat composition that includes:
- (a) polymerizable composition comprising hard and flexible polymerizable subunits, wherein (i) the hard subunit comprises alkoxylated trimethylolpropane triacrylate with a degree of alkoxylation ranging from about 1 to about 10;
- (ii) the flexible subunit comprises alkoxylated trimethylolpropane triacrylate with a degree of alkoxylation ranging from about 10 to about 20;
- and (iii) the ratio of hard to flexible subunits in the composition is from about 1.5:1 to about 4:1;
- and
- (b) polymeric binder.
A topcoat film supply comprising:
- a base film having a first surface, the first surface having a surface structure with an average roughness of at least about 0.15 micron;
- and
- a radiation curable composition disposed on the first surface of the base film, the radiation curable composition comprising:
- (a) polymerizable composition comprising hard and flexible polymerizable subunits, wherein (i) the hard subunit comprises alkoxylated trimethylolpropane triacrylate with a degree of alkoxylation ranging from about 1 to about 10;
- (ii) the flexible subunit comprises alkoxylated trimethylolpropane triacrylate with a degree of alkoxylation ranging from about 10 to about 20;
- and (iii) the ratio of hard to flexible subunits in the composition is from about 1.5:1 to about 4:1;
- and
- (b) a polymeric binder.
Dependencies are inferred from the claim text.