Heat-sensitive recording medium
AssigneeKanzaki Paper Manufacturing Co., Ltd.
InventorsNobuo Kanda, Naoto Arai, Tosaku Okamoto, Isamu Nakano, Tetsuo Tsuchida
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Abstract
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: ##STR1## wherein R represents a tert-butyl group.
Claims13
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:
- ##STR3## wherein R represents a tert-butyl group and at least one alkaline pigment in an amount of 3 to 15% by weight based on the total solids contained in the recording layer.
Dependencies are inferred from the claim text.