Hitachi, Ltd.

Nitto Electric Industrial Co., Ltd.

Shinichi Akasaka

Shuichi Ohara

Hiroshi Matsumoto

Toshikazu Narahara

Satoru Amou

Yasuki Mori

Shintaroo Hattori

Hiroyuki Oka

A heat transfer sheet which has a high recording sensitivity and can form image of high maximum reflection density and of high contrast is provided by containing in an ink layer of the heat transfer sheet at least one dye which has a product of an extinction coefficient (l.cm.sup.-1.g.sup.-1) and an evaporation or sublimation rate at 240.degree. C. (wt %.min..sup.-1) of at least 1.8.times.10.sup.2 (l.wt %.cm.sup.-1.g.sup.-1.min.sup.-1).

Heat transfer sheet, method for producing it, and method of heat transfer

A thermal transfer recording sheet comprising a substrate and ink layer formed thereon containing one or more sublimable dyes and a high-molecular-weight polyamide obtained from dimer acids as a binder is good in adherence of the ink layer to the substrate, and thermal transfer properties to give clear color hard copies.

Thermal transfer sheet

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Hitachi, Japan

Shinichi Akasaka