Processes for the preparation of titanium-phthalocyanine Type X

A process for the preparation of Type X titanyl phthalocyanine consisting of reacting titanium tetrabutoxide and diiminoisoindolene in the presence of a chloronaphthalene solvent;

• dissolving the resulting Type I titanyl phthalocyanine in a trihaloacetic acid and an alkylene halide wherein alkylene contains from between 1 to about 6 carbon atoms;
• adding the resulting mixture slowly to a cold aqueous aliphatic alkane alcohol solution wherein alkane contains from 1 to about 12 carbon atoms;
• maintaining the resulting mixture at a temperature of from about -10.degree. to about 0.degree. C.;
• and thereafter isolating the resulting Type X titanyl phthalocyanine with an average volume particle size diameter of from about 0.05 to about 0.1 micron.

A process for the preparation of titanyl phthalocyanine consisting of adding titanium tetrabutoxide to 1,3-diiminoisoindolene in a 1-chloronaphthalene solvent;

• heating said mixture to reflux temperature of from about 130.degree. to about 180.degree. C.;
• removing any volatile byproducts by distillation thereby increasing the reflux temperature from about 180.degree. to about 200.degree. C.;
• maintaining the reaction mixture at said temperature for a time period of from about 0.5 to about 8 hours;
• followed by cooling the reaction mixture to a temperature of from about 130.degree. to about 180.degree. C. by removal of the heat source;
• and filtering said hot mixture to separate the solid titanyl phthalocyanine Type I product;
• dissolving the resulting Type I titanyl phthalocyanine in a trihaloacetic acid and an alkylene halide wherein alkylene contains from 1 to about 6 carbon atoms, adding the resulting mixture slowly to a cold aqueous aliphatic alkane alcohol solution, wherein alkane contains 1 to about 12 carbon atoms, and thereafter isolating the resulting Type X titanyl phthalocyanine with a average volume particle size diameter of from about 0.05 to about 0.1 micron.