A method for the preparation of the x - the form of the metal-free phthalocyanine, and its use in electrophotographic recording materials

摘要

1,189,206. X-form of metal-free phthalocyanine. RANK XEROX Ltd. 18 July, 1967 [21 July, 1966], No. 32870/67. Heading C4P. The X-form of metal-free phthalocyanine is prepared by mixing the a-form with a portion of the X-form in an organic vehicle and maintaining the mixture until a major proportion is converted to the X-form. The mixture may be stirred or milled. The organic vehicle may be an aliphatic solvent, preferably containing a carbonyl group or contain a resin.