2,9-Dichloro-quinacridone as alpha-quinacridone crystal...

Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...

Reexamination Certificate

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Details

C106S031770, C106S497000, C524S090000, C544S049000, C544S056000

Reexamination Certificate

active

07101428

ABSTRACT:
The invention is directed to a method or use of 2,9-dichloro-quinacridone as a crystal phase inhibitor during the beta-quinacridone or gamma-quinacridone crude pigment particle size reduction processes. 2,9-dichloroquinacridone is added to the milling composition of the crude gamma or crude beta quinacridone.

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patent: 2844581 (1958-07-01), Manger et al.
patent: 2969366 (1961-01-01), Griswold et al.
patent: 4857646 (1989-08-01), Jaffe
patent: 5229515 (1993-07-01), Pfenninger et al.
patent: 5281269 (1994-01-01), Ganci et al.
patent: 5755874 (1998-05-01), Urban et al.
patent: 5989333 (1999-11-01), Urban et al.
patent: 6312512 (2001-11-01), Urban et al.
patent: 0517662 (1992-12-01), None
W. Herbst et al., Industrial Organic Pigments, Production, Properties, Applications, 2ndCompletely Revised Ed., (1997), p. 464, no month.
R. B. McKay, Control of the Application Performance of Classical Organic Pigments, JOCCA, (1989), pp. 89-93, no month.

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