Appleton Papers Inc.

Thomas C Petersen

Steven L Vervacke

Dean G Dalebroux

A high sensitivity thermal paper resistant to image erasure is disclosed. The thermal paper has a color-forming composition comprising a chromogenic material, an acidic developer material, a water insoluble polymer consisting of poly .alpha.-methylstyrene or .alpha.-methylstyrene/vinyltoluene copolymer, and a thermal modifier. Preferably the thermal modifier is selected from acetoacet-o-toluidine, diphenoxyethane, phenyl-1-hydroxy-2-naphthoate, diheptadecyl ketone and octadecanamide. The disclosed composition when thermally imaged is surprisingly resistant to image erasure and smearing attributable to fingerprint oils.

Thermally-responsive record material

A thermally-sensitive color-forming composition is disclosed which comprises chromogenic material and certain acidic developer material. Record material comprising this color-forming composition exhibits greatly improved background coloration.

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Appleton, WI, United States of America

Thomas C Petersen