C - Chemistry – Metallurgy – 09 – B
Patent
C - Chemistry, Metallurgy
09
B
C09B 48/00 (2006.01) C09B 67/14 (2006.01)
Patent
CA 2299494
A process for the preparation of a quinacridone of the formula: Image wherein A and B each independently represent a substituent selected from H, F, CI, C1-C3alkyl and C1-C3alkoxy, including the steps of: (A) heating a reaction mixture containing (a) at least one unsubstituted and/or substituted 2,5-diarylamino-6,13-dihydroterephthalic acid and (b) about 3 to about 10 parts by weight of polyphosphoric acid per part of component (a) to a temperature of above about 125°C to form a quinacridone melt; (B) treating the quinacridone melt resulting from (A) with about 1 % to about 30% by weight, based on the weight of component (a), of concentrated sulfuric acid, to form a reaction mixture; (C) drowning the reaction mixture of (B) in a liquid in which the quinacridone is substantially insoluble; and (D) recovering the resulting quinacridone pigment.
Ciba Specialty Chemicals Holding Inc.
Fetherstonhaugh & Co.
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