THERMAL TRANSFER PRINTING

摘要

A thermal transfer printing sheet comprising a substrate having a coating comprising a binder and a water insoluble dye of Formula I: <CHEM> wherein; R is the residue of an active methylene compound; X is hydrogen; halogen; optionally substituted alkyl; optionally substituted aryl or optionally substituted heteroaryl; Y is -S- or a group of the formula N - R<1> wherein R<1> represents hydrogen or an optionally substituted C1-4-alkyl; and E is the residue of a coupling component. The dyes are suitable for use in dye diffusion thermal transfer printing of the type where a transfer sheet is placed in contact with the material to be printed and selectively heated in accordance with a pattern information signal whereby dye from the selectively heated regions of the transfer sheet is transferred to the material to be printed and forms a pattern thereon the shape and density of which is in accordance with the pattern and intensity of heat applied to the transfer sheet.