Heat-sensitive record material
AssigneeKanzaki Paper Manufacturing Co., Ltd.
InventorsTakeshi Murakami, Teruo Nakamura, Hisanori Yagi
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Abstract
The heat-sensitive record material comprises a base sheet and a color developing layer formed on at least one surface of said base sheet, said color developing layer comprising electron donating color forming material and acceptor reactive with said color forming material to develop a color, said color developing layer further including as a binder water soluble resinous material having carboxyl radicals, partly in the form of magnesium salt and partly in the form of another salt.
Claims14
In a heat-sensitive record material comprising a base sheet and a color developing layer formed on at least one surface of said base sheet, said color developing layer comprising electron donating color forming material and acceptor which is reactive with said color forming material to develop a color, the improvement in said color developing layer further including as a binder water soluble resinous material having carboxyl radicals, at least 35% of said carboxyl radicals neutralized by alkaline materials to form magnesium salt and at least one other salt which is a member selected from the group consisting of sodium salt, potassium salt, ammonium salt and amine salt, 30 to 80% of the total carboxyl radicals existing in the form of magnesium salt and 5 to 70% of the total carboxyl radicals existing in the form of said other salt;
- wherein said water soluble resinous material having carboxyl radicals comprises a copolymer made by copolymerization of at least one ethylenic monomer, at least one conjugated diolefinic monomer and at least one unsaturated carboxylic acid;
- and wherein said unsaturated carboxylic acid component comprises 30 to 70% by weight of said copolymer.
Dependencies are inferred from the claim text.