Imperial Chemical Industries Limited

Imperial Chemical Industires Plc

Paul A Edwards

Richard A Hann

Nicholas C Beck

Gary W Morrison

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

Thermal transfer printing receiver sheet

In a receiver sheet for dye-diffusion thermal transfer printing, a receiver coat of dye-receptive polymer containing a crosslinked silicone release system, is protected against loss of release function when overlying a substrate or coating containing particulate metal salts or metal oxides, by a protective polymeric interlayer comprising an acidic polymer composition selected from:

Thermal transfer printing receiver

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.

Security laminates

In a thermal transfer print, the ready diffusion of dyes through the receiver layer, which is necessary for effecting their thermal transfer from a dyesheet during printing, can also lead to subsequent diffusion within the print, with consequent degradation of print quality. This form of print instability is now countered by using a receiver layer comprising a dye-receptive polymer composition doped with a print stabilizer consisting of a toluene sulphonamideformaldehyde condensation product.

Thermal transfer receiver

A receiver sheet for dye-diffusion thermal transfer printing, comprising a sheet-like dielectric substrate supporting a layer of dye-receptive material on one side, has an antistatic treatment on both sides to improve handling. The antistatic treatment on the side supporting the receiver coat comprises a conductive undercoat located between the substrate and the layer of dye-receptive material. Effective conductive undercoat materials include a cross-linked organic polymer containing a plurality of ether linkages doped with an alkali metal salt to provide conductivity. The antistatic treatment on the other side is preferably incorporated into a heat resistant and/or low friction backcoat, but like that of the receiver side, could also be in the form of a conducting undercoat between the substrate and backcoat.

A receiver sheet for dye-diffusion thermal transfer printing comprises a sheet-like substrate supporting a receiver coat layer in which a dye-receptive polymer composition is doped with a release system comprising the reaction product of at least one silicone having a plurality of hydroxy groups per molecule and at least one polyfunctional N-(alkoxymethyl) amine resin reactive with such hydroxyl groups under acid catalyzed conditions.

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Essex, United Kingdom

Paul A Edwards