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US 5,476,831 AGranted
Thermal transfer printing receiver
AssigneeImperial Chemical Industries PLC
InventorsNicholas C. Beck, Richard A. Hann, Gary W. Morrison
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AssigneeImperial Chemical Industries PLC
InventorsNicholas C. Beck, Richard A. Hann, Gary W. Morrison
Estimating the term…
A thermal transfer printing receiver sheet for use in security laminates, comprises a substrate supporting a receiver coat of a dye-receptive composition on one side and a backcoat on the other, wherein the backcoat comprises a thermoplastic polymer having a Tg less than 130.degree. C., and dispersed therein a particulate solid material in amount 1-24% by weight of the thermoplastic polymer and an average particle size of 0.3-10 .mu.m. The security laminates are prpared after printing the receiver with an image, by bonding a first cover sheet of plastics material to the printed receiver coat so as to overlie the image, and a second cover sheet of plastics material can be bonded to the present backcoat more readily than to a highly crosslinked backcoat, using common adhesives. For greater security, thicker than normal backcoats are used.
A thermal transfer printing receiver sheet comprising a substrate supporting a receiver coat of a dye-receptive composition on one side and a backcoat on the other, characterised in that the backcoat comprises a thermoplastic polymer having a Tg less than 130.degree. C., and dispersed therein a particulate solid material in amount 1-24% by weight of the thermoplastic polymer and an average particle size of 0.3-10 .mu.m.
A thermal transfer printing receiver sheet as claimed in claim I, characterised in that the particulate material comprises particles having an average size of 0.3-2 .mu.m in an amount of 1-15% by weight of the thermoplastic polymer.
A security laminate comprising an information sheet printed with an information-containing image and having a protective cover sheet bonded to each side, characterised in that the information sheet is a thermal transfer printing receiver sheet comprising a substrate supporting on one side a receiver coat of a dye-receptive composition containing at least one thermal transfer dye located in selected positions to form the image, and on the other side a backcoat comprising a thermoplastic organic polymer having a Tg less than 130.degree. C., and dispersed therein a particulate solid material in amount 1-24% by weight of the thermoplastic polymer and an average particle size of 0.3-10 .mu.m;
Dependencies are inferred from the claim text.