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.
本文公开了水杨酸共聚物,其重量平均分子量为 500 10、000 的水杨酸共聚物;(a)在酸催化剂存在下,将水杨酸(i)与苄醇(ii)和/或苄醚(iii)或苄基卤化物(iv)缩合而得,或(b)将(i)和(ii)和/或(iii)的共缩合树脂与(iv)反应而得,或(c)在酸催化剂存在下,将(i)和(ii)和/或(iii)或(iv)的共缩合树脂与苯乙烯衍生物反应而得;水杨酸共聚物的多价金属盐;由多价金属盐组成的显色剂;以及由显色剂组成的适用于压敏复印纸的显色薄片。此外,还公开了它们的生产工艺。