Phthalocyanine treatment process

Details Phthalocyanine treatment process Phthalocyanine treatment process

C - Chemistry, Metallurgy

09

B

260/196.1

C09B 47/067 (2006.01) C09B 67/16 (2006.01) G03G 5/06 (2006.01)

Patent

CA 1284494

ABSTRACT A process is described for preparing vanadyl phthalocyanine for electrophotographic devices comprising reacting vanadium pentoxide and phthalonitrile to form vanadyl phthalocyanine pigment and other reaction products, separating crude vanadyl phthalocyanine pigment from the other reaction products, washing the crude vanadyl phthalocyanine pigment, drying the crude vanadyl phthalocyanine pigment, mixing the crude vanadyl phthalocyanine pigment with a solution of between about 60 percent and about 80 percent by weight of H2SO4 to form a H2SO4-vanadyl phthalocyanine pigment mixture, dilutingthe H2SO4-vanadyl phthalocyanine pigment mixture with deionized water to form a diluted mixture, separating the vanadyl phthalocyanine pigment, washing the isolated vanadyl phthalocyanine pigment particles, drying the vanadyl phthalocyanine particles to form the dried, partially purified vanadyl phthalocyanine pigment, dissolving the dried, partially purified vanadyl phthalocyanine pigment in concentrated H2SO4 to form a solution of vanadyl phthalocyanine in concentrated H2SO4, adding the solution of vanadyl phthalocyanine in concentrated H2SO4 to water to precipitate the vanadyl phthalocyanine as vanadyl phthalocyanine pigment particles, separating the precipitated vanadyl phthalocyanine pigment particles from the H2SO4 and water, washing the isolated vanadyl phthalocyanine pigment particles, and drying the vanadyl phthalocyanine pigment particles to form purified vanadyl phthalocyaninepigment.

553917

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