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    • 62. 发明授权
    • Color developer for pressure-sensitive recording sheets
    • 压敏记录纸的彩色显影剂
    • US5393332A
    • 1995-02-28
    • US164483
    • 1993-12-09
    • Toranosuke SaitoTakashi IshibashiEiji KawabataMasato TanakaToshio Kimura
    • Toranosuke SaitoTakashi IshibashiEiji KawabataMasato TanakaToshio Kimura
    • C07C51/15C07C65/10C09D11/00
    • C07C51/15
    • Herein disclosed is a method for preparing a nuclear-substituted salicylic acid or a metal salt thereof represented by the following general formula (1): ##STR1## [wherein R.sub.1 and R.sub.2 each represents a t-butyl group, a t-amyl group, a t-octyl group, an isononyl group or an isododecyl group, provided that at least one of R.sub.1 and R.sub.2 represents an isononyl group or an isododecyl group; M represents a hydrogen atom or a metal atom; and n is the atomic valency of the metal atom M] which comprises the step of subjecting, to a Kolbe-Schmitt reaction, an alkali metal salt of a nuclear-substituted phenol represented by the following general formula (2): ##STR2## [wherein R.sub.1 and R.sub.2 are the same as those defined above] in which 100 to 50% of the alkali metal salt is potassium salt and 0 to 50% thereof is sodium salt, in a substantially water-insoluble solvent as a reaction medium. The method makes it possible to improve the yield of the specific nuclear-substituted salicylic acid and metal salts thereof and to provide such products having high purity without any post-treatment. The compounds can be used in color developers for pressure-sensitive recording sheets without any additional purification treatment.
    • 本文公开了一种由以下通式(1)表示的核取代的水杨酸或其金属盐的制备方法:其中R1和R2各自表示叔丁基,t- 戊基,叔辛基,异壬基或异十二烷基,条件是R 1和R 2中的至少一个表示异壬基或异十二烷基; M表示氢原子或金属原子; 并且n是金属原子M的原子价,其包括以下通式(2)表示的核取代苯酚的碱金属盐进行Kolbe-Schmitt反应的步骤:< IMAGE> 2)[其中R1和R2与上述定义相同],其中100〜50%的碱金属盐为钾盐,0〜50%为钠盐,在基本不溶于水的溶剂中作为反应介质 。 该方法可以提高特定的核取代的水杨酸及其金属盐的产率,并提供具有高纯度的这种产品,而不需要后处理。 这些化合物可以用于彩色显影剂,用于压敏记录片材,而无需任何额外的纯化处理。