Salicylic acid copolymers and their metal salts, production process thereof, color-developing agents comprising metal salts of the copolymers and color-developing sheets employing the agents
申请人:MITSUI TOATSU CHEMICALS, Inc.
公开号:EP0268878A2
公开(公告)日:1988-06-01
Disclosed herein are salicylic acid copolymers having a weight average molecular weight of 500 10,000 and obtained (a) by condensing salicylic acid (i) with a benzyl alcohol (ii) and/or benzyl ether (iii) or a benzyl halide (iv) in the presence of an acid catalyst or (b) by reacting a co-condensation resin of (i) and (ii) and/or (iii) with (iv) or (c) by reacting a co-condensation resin of (i) and (ii) and/or (iii) or (iv) with a styrene derivative in the presence of an acid catalyst; multivalent metal salts of the salicylic acid copolymers; color-developing agents comprising the multivalent metal salts; and color-developing sheets suited for pressure-sensitive copying paper and comprising the color-developing agents. Their production processes are also disclosed.
A color-developing composition comprises a multivalent-metal-modified salicylic acid resin (Resin A) and a polycondensation resin (resin B) at a weight ratio of 90-30 to 10-70. Resin A is composed of 5-35 mole% of a structural unit (I) and 65-95 mole% of at least one structural unit (II) or 65-95 mole% of a coupled structural unit of at least one unit (II) and at least one unit (III) and has a weight-average molecular weight of 350-5,000. Resin B is composed of the unit (II) and/or the unit (III) and has a weight-average molecular weight of 350-5,000.
wherein Z represents M/m, M being a metal ion of m valence and m being an integer; R₁ and R₂ represent H or a C₁₋₁₂ alkyl, aralkyl, aryl or cycloalkyl group; R₃ and R₆ represent H or a C₁₋₄ alkyl group; and R₄ and R₅ represent H or CH₃.
一种显色组合物包括一种多价金属改性水杨酸树脂(树脂 A)和一种缩聚树脂(树脂 B),两者的重量比为 90-30 比 10-70。树脂 A 由 5-35 摩尔%的结构单元(I)和 65-95 摩尔%的至少一个结构单元(II)或 65-95 摩尔%的至少一个单元(II)和至少一个单元(III)的耦合结构单元组成,其重量平均分子量为 350-5000。树脂 B 由单元(II)和/或单元(III)组成,重量平均分子量为 350-5000。
其中 Z 代表 M/m,M 为 m 价金属离子,m 为整数;R₁ 和 R₂ 代表 H 或 C₁₋₁₂ 烷基、芳基、芳烷基或环烷基;R₃ 和 R₆ 代表 H 或 C₁₋₄ 烷基;以及 R₄ 和 R₅ 代表 H 或 CH₃。