Process for the purification of triphenylmethane compounds and p

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427150, 4284111, 428914, 260391, B41M 522

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044484461

ABSTRACT:
Triphenylmethane dyes are obtained in a purified or more concentrated condition which eliminates the excess aromatic amines and by-products obtained during the synthesis of the triphenylmethane dyes. These purified triphenylmethane dyes show special utility when used in combination with an electron acceptor (Lewis acid) to produce carbonless copy paper or when used as reactants in the manufacture of other dyes.

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patent: 4272292 (1981-06-01), Mizuno et al.
The Chemistry of Synthetic Dyes and Pigments, edited by H. A. Lubs 1955, pp. 274-289.

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