Heat-sensitive recording material.

摘要

Described is a heat-sensitive recording material incorporating a colorless or pale-colored basic dye and a color acceptor which is reactive with the dye to form a color when contacted therewith, said recording material being characterized in that (a) as the basic dye are used 100 parts by weight of a specific phthalide derivative of the formula [ I ] and 20 to 100 parts by weight of a specific black color-forming fluoran derivative of the formula [ II ], (b) as the color acceptor is used a polyvalent metal salt of an aromatic carboxylic acid and (c) a recording sensitizer is further used, and whereby the resulting record images are at least 0.75 in PCS value at 800nm.