Production of pigment

Abstract

Abstract PROBLEM TO BE SOLVED: To provide a method for producing a pigment, capable of converting the pigment into a pigment type having excellent color concentration and gloss, carrying out a kneading process at a relatively low temperature, and easily recovering and reusing an used acid by kneading the crude pigment in the presence of the liquid carboxylic acid. SOLUTION: (A) A crude pigment is kneaded in the presence of (B) a liquid carboxylic acid and, if necessary, (C) a salt. The component B is preferably a 4-10C carboxylic acid, concretely 2-ethylhexanoic acid, oleic acid, hexanoic acid, valeric acid or heptanoic acid. The component A is preferably crude phthalocyanine, etc., and the amine salt of phthalocyaninesulfonic acid is preferably added as a pigment additive. The component C is preferably used in an amount of 0.1-20 pts. per pt. of the component A, and the kneading process is preferably carried out at a temperature of 80-120°C. COPYRIGHT: (C)1997,JPO

Inventors

• 👤 Paul Kerwin
• 👤 カーウィン ポール
• 👤 Robert Langley
• 👤 ラングレイ ロバート
• 👤 Arthur Stark Walls
• 👤 スターク ウォールス アーサー

Bibliographic Details