Лако-красочные материалы — производство

The sulfonic acids and sulfonyl chlorides, especially those of CuPc, are readily accessible. The sulfonic acids CuPc(SO3H)n with n=2, 3, or 4 were significant direct cotton dyes ( C. I. DirectBlue 86, 74186 and 87, 74200). The sulfonyl chlor­ides are intermediates in the production of various copper phthalocyanine color­ants [35, p. 259], [36, p. 192]. The water-soluble sulfonic acids are produced by heating copper phthalocyanines in oleum. By varying concentration, reaction temperature, and time, one to four sulfo groups can be introduced in the 4-posi­tion [70]. The products synthesized from 4-sulfophthalic acid exhibit slightly dif­ferent properties. This is due to the different isomer distribution with respect to the 4- and 5-positions. Only one sulfo group is introduced in each benzene ring, as shown by the fact that only 4-sulfophthalimide is obtained on oxidative degra­dation. The most important dyes have two sulfonic acid groups per molecule.