Printing sheet comprising a dye receiving layer made of an isocyanate group-containing polymer

A printing sheet for use in a thermal transfer printing system, including a substrate having a dye-receiving layer thereon, said dye-receiving layer consisting essentially of 100 parts by weight of at least one film-forming resin selected from the group consisting of AS resins, cellulose acetylbutyrate resins, polyvinyl butyral resins, and vinyl chloride-vinyl acetate copolymer resins and from about 0.5 to about 30 parts by weight of said film-forming resin of an isocyanate group-containing polymer produced by reacting a mixture consisting essentially of a multi-functional polyisocyanate and a hydroxy-terminated silicone, said dye-receiving layer optionally including at least one additive selected from the group consisting of sensitizers, fluorescent brighteners, white pigments, antistatic agents, plasticizers, ultraviolet absorbers and antioxidants.