Imperial Chemical Industries Limited

Gary W Morrison

Richard A Hann

Nicholas C Beck

Dean Thetford

Nigel Hall

Paul A Edwards

Christopher Bennett

Stephen Mann

Mark Pett

Godfrey William Moore

A transparent receiver sheet adapted to receive a color toner image by an electrophotographic or electrostatic process and suitable for use in an overhead projector, comprises a toner acceptance layer that comprises a resin condensation product of toluene sulphonamide. The resin is conveniently a condensation product of toluene sulphonamide and formaldehyde. One or more secondary polymers are preferably included in an amount in the range 0-60% weight.

Receiver sheet

An inkable sheet comprises a substrate having on at least one surface thereof an ink absorbent layer comprising a cellulose material and an acid functional resin which is insoluble in water of neutral or acidic pH at room temperature. The acid functional resin may comprise an acid functional polyurethane resin or an acid functional acrylic resin such as a polyacrylate/acrylic acid copolymer. The ink absorbent layer preferably further comprises a weak organic acid or salt thereof and/or at least one crosslinking agent.

Inkable sheets

Thermal transfer printing receiver sheet

Thermal transfer printing receiver

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 benzofuranone of the Formula (1): ##STR1## wherein: R.sup.1 and R.sup.2 are each independently --H or optionally substituted C.sub.1-20 -alkyl;

Benzofuranones

A security laminate comprises a thermal transfer print having a receiver layer comprising a thermoplastic dye-receptive polymer doped with a cross-linked silicone-containing release system in which the total silicone content is reduced to 0.01-1% by weight of the thermoplastic dye-receptive polymer, and a cover sheet of plastics material bonded to the receiver layer by heat and pressure, preferably without further adhesives between the print and cover sheet.

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London, United Kingdom

Gary W Morrison