| 摘要 |
Mixtures of a metal salt of formula <IMAGE> (1) and a metal salt of formula <IMAGE> (2) in which formulae (1) and (2) Me is a metal ion of valency n, n is 2, 3 or 4, and each of the rings A and B independently of the other is unsubstituted or substituted by halogen, lower alkyl, lower alkoxy or an alpha -methylbenzyl radical, are prepared by reacting 2 moles of salicylic acid with at least 2 moles of a styrene compound of formula <IMAGE> (3) and at least 2 moles of a styrene compound of formula <IMAGE> (4) in which formulae (3) and (4) the benzene rings A' and B' are unsubstituted or substituted by halogen, lower alkyl or lower alkoxy, in the presence of an aromatic sulfonic acid, and, in a further step, reacting 2n moles of the resultant mixture of the salicylic acid compound of formula <IMAGE> (5) and the salicylic acid compound of formula <IMAGE> (6) in which formulae (5) and (6) A and B are as defined for formulae (1) and (2), with 2 moles of the salt of an n-valent metal of an inorganic acid or of a lower aliphatic carboxylic acid, where n has the given meaning. The mixtures of metal salts are particularly suitable for use as color formers in pressure- and heat-senstive recording materials.
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