Security cards
First Claim
1. A security card comprising a data-carrying sheet having a gelatin layer thereon and a transparent polymeric film having a gelatin layer thereon, said sheet and said film being bonded together by an adhesive composition polymerized between and in contact with the gelatin layers, the adhesive composition comprising a carboxylic acid having at least one polymerizable acrylic group.
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0 Petitions
Accused Products
Abstract
A security card comprises a data-carrying sheet having a gelatin layer thereon and a transparent polymeric film having a gelatin layer thereon, said sheet and said film being bonded together by an adhesive composition polymerized between and in contact with the gelatin layers, the adhesive composition comprising a carboxylic acid having at least one polymerizable acrylic group.
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Citations
20 Claims
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1. A security card comprising a data-carrying sheet having a gelatin layer thereon and a transparent polymeric film having a gelatin layer thereon, said sheet and said film being bonded together by an adhesive composition polymerized between and in contact with the gelatin layers, the adhesive composition comprising a carboxylic acid having at least one polymerizable acrylic group.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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4. A card according to claim 3, in which R1 denotes a hydrogen atom and R2 denotes a hydrogen atom or a group of formula --CH2 CH2 COOH, or R1 denotes a methyl group and R2 denotes a hydrogen atom or a group of formula --CH2 CH(CH3)COOH.
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5. A card according to claim 1, in which the adhesive composition also contains a further acrylic material which is a polyfunctional material having, on average, more than one polymerizable acrylic group per molecule.
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6. A card according to claim 3, in which the adhesive composition also contains a further acrylic material which is a polyfunctional material having, on average, more than one polymerizable acrylic group per molecule.
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7. A card according to claim 5, in which the polyfunctional material is an ester of an epoxide resin with a carboxylic acid having a polymerizable acrylic group.
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8. A card according to claim 6, in which the polyfunctional material is an ester of an epoxide resin with a carboxylic acid having a polymerizable acrylic group.
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9. A card according to claim 7, in which the polyfunctional material is an ester of an epoxide resin with acrylic or methacrylic acid.
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10. A card according to claim 8, in which the polyfunctional material is an ester of an epoxide resin with acrylic or methacrylic acid.
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11. A card according to claim 7, in which the adhesive composition also contains an ester of the epoxide resin with a saturated monocarboxylic acid having from 6 to 20 carbon atoms.
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12. A card according to claim 8, in which the adhesive composition also contains an ester of the epoxide resin with a saturated monocarboxylic acid having from 6 to 20 carbon atoms.
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13. A card according to claim 1, in which the adhesive composition contains a mixture of the carboxylic acid and a polyfunctional material having, on average, more than one polymerizable acrylic group per molecule, the weight ratio of carboxylic acid to polyfunctional material being from 1:
- 1.5 to 10;
1.
- 1.5 to 10;
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14. A card according to claim 1, in which the adhesive composition also contains a photopolymerization initiator for the acrylic group and is polymerized by subjection to photopolymerizing radiation.
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15. A card according to claim 14, in which the adhesive composition also contains a free radical polymerization initiator and is polymerized by subjection to photopolymerizing radiation followed by free radical polymerization.
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16. A card according to claim 1, in which the adhesive composition also contains a free radical polymerization initiator and is polymerized by free radical polymerization.
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17. A card according to claim 1, in which the transparent polymeric film is of a polyester or a cellulose triacetate.
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18. A card according to claim 1, in which the data-carrying sheet is a sheet of paper.
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19. A card according to claim 1, in which the data-carrying sheet has a gelatin layer on each face and a transparent polymeric film as specified in claim 1 is bonded to each face.
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20. A card according to claim 1, obtained by pressing the transparent polymeric film and the data-carrying sheet together, with the adhesive composition sandwiched between them, in a laminating apparatus.
Specification