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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C106S031770, C106S497000, C524S090000, C544S049000, C544S056000

Reexamination Certificate



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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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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