Canon Kabushiki Kaishahas Patents Method for Producing a Pigment

October 5, 2010

Patent No. U.S. 7,737,270 B2
Canon Kabushiki Kaishahas has been granted a patent for a method for producing a copper phthalocyanine pigment or titanyl phthalocyanine pigment. The method is comprised of a step of obtaining a mixture by mixing at least one compound selected from the group of phthalonitrile, phthalonitrile derivative, isoindoline derivative and subphthalocyanine derivative, and a compound supplying copper or titanium with a solvent; and a step of holding the mixture at not less than a temperature where a subcritical state or a supercritical state of the solvent occurs to obtain the pigment by reacting the compounds.