Heat-sensitive recording medium

摘要

PCT No. PCT/JP91/01291 Sec. 371 Date May 26, 1992 Sec. 102(e) Date May 26, 1992 PCT Filed Sep. 27, 1991 PCT Pub. No. WO92/05963 PCT Pub. Date Apr. 16, 1992.The invention provides a heat-sensitive recording medium comprising (a) a support and (b) a heat-sensitive recording layer formed on the support and comprising a colorless or pale-colored basic dye and a color developing material capable of causing color development upon contact with the dye by heating, which medium is characterized in that the heat-sensitive recording layer contains at least one phosphate compound selected from the group consisting of 2,2'-methylenebis(4,6-di-tert-butylphenyl) phosphate of the general formula (1) shown below and alkali metal, ammonium and polyvalent metal salts thereof: (* CHEMICAL STRUCTURE *) (1) wherein R represents a tert-butyl group.