| 摘要 |
PROBLEM TO BE SOLVED: To enhance the stability and water-resistant stability of a developed color image by setting one kind of monomers unit to a monomer containing a specific sulfonylurea group or a sulfonylthiourea group. SOLUTION: A polymeric copolymer consisting of two or more kinds of monomer units is constituted as a coupler such as active clay, attapulgite, zeolite, bentonite, p-phenylphenol novolac resin or zinc 3,5-di(α-methylbenzyl) salicylate used in a coupling sheet for pressure-sensitive recording. One kind of the monomer units is set to a monomer unit containing a sulfonylurea group or a sulfonylthiourea group represented by formula (wherein X is an oxygen atom or a sulfur atom). By this constitution, the stability and water-resistant stability of a developed color image can be enhanced. |
