A color-developing composition contains a multivalent metal salt of a salicylic acid resin obtained from a salicylic acid ester and styrenes which include a styrene dimer. An aqueous suspension of the color-developing composition can be obtained by finely wet-grinding the color-developing composition in the presence of at least one anionic, water-soluble, high-molecular substance selected from (a) polyvinyl alcohol derivatives containing at least one sulfonic acid group in the molecules thereof and salts thereof and (b) polymers and copolymers containing as an essential component a styrenesulfonic acid salt. A color-developing sheet for pressure-sensitive copying paper sheets can be obtained by using the aqueous suspension.
一种显色组合物含有一种
水杨酸树脂的多价
金属盐,该
水杨酸树脂由
水杨酸酯和包括
苯乙烯二聚体的
苯乙烯获得。通过在至少一种阴离子、
水溶性、高分子物质的存在下对显色组合物进行精细湿磨,可以得到显色组合物的
水悬浮液,这些物质选自(a)分子中至少含有一个
磺酸基团的聚
乙烯醇衍
生物及其盐和(b)作为基本成分含有
苯乙烯磺酸盐的聚合物和共聚物。使用该
水悬浮液可获得用于压敏复印纸的显色薄片。