C - Chemistry – Metallurgy – 09 – B
Patent
C - Chemistry, Metallurgy
09
B
C09B 48/00 (2006.01) C09B 67/04 (2006.01) C09B 67/10 (2006.01) C09B 67/52 (2006.01)
Patent
CA 2070559
P-18675/A/CGC 1557 AQUEOUS PROCESS FOR PREPARATION OF MODIFIED BETA QUINACRIDONE Abstract of the Disclosure Aqueous processes for the preparation of a beta quinacridone modification possessing a magenta color having C.I.E. color space values in masstone of L=33-36, A=34-40 and B=8-15 starting with the crude pigment and comprising several milling and alternative deaggregation and recrystallization steps, the latter being facilitated by elevated temperatures, the presence of base, a phase transfer catalyst and minor amounts of crystal growth promoting amounts of an alcohol.
Ganci James B.
Hendi Shivakumar B.
Zukowski Walter C.
Ciba Specialty Chemicals Holding Inc.
Fetherstonhaugh & Co.
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