METHOD FOR PRODUCING PRINTING INK

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a printing ink reducing aggregation of pre-pigment and having excellent quality at a low cost without having various bad influences on such production process to occur by using resins in conventional methods in large amounts and on printing ink in the rationalized method for directly producing printing ink by using a pre-pigment of copper phthalocyanine without passing a form of pigment through.

SOLUTION: In the method for directly producing the printing ink containing at least copper phthalocyanine and a resin for printing ink by using a pre- pigment of copper phthalocyanine without passing a form of pigment through, a pre-pigment composition prepared by pulverizing, in a dried state, a crude copper phthalocyanine previously surface-treated with a rosin compound is used as the pre-pigment of copper phthalocyanine.

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