Ciba Specialty Chemicals Corporation

Ciba Corporation

Basf Se Corporation

James Will

Yingxia He

Colin Dennis Campbell

Kevin Rodney Gerzevske

Gordian Schilling

Rhonda Carter

Tapan K Debroy

Melissa Wagner

A pigment composition comprising an intimate mixture of an organic pigment and fumed silica is prepared which exhibit improved coloristic characteristics including excellent chroma, color strength and enhanced color flop when incorporated into in polymeric systems, such as plastics or surface coatings, for example inks and paints. Also provided are coating compositions and plastic articles that are pigmented with a tinctorially effective amount of the inventive pigment composition. A particular embodiment of the invention relates to pigments useful in automotive coatings.

Co-milling organic pigments with fumed silica

The invention is directed to a method or use of 2,9-dichloro-quinacridone as an alpha crystal phase inhibitor and optionally, 4,11-dichloroquinacridone during the beta-quinacridone or gamma-quinacridone crude pigment particle size reduction processes. The invention is also directed to solid solutions of quinacridone comprising about 98 to about 80 weight % gamma or beta-quinacridone, about 0.1 to about 10 weight % 2,9-dichloroquinacridone and about 0.1 to about 10 weight % 4,11-dichloroquinacridone.

2,9-dichloro-quinacridone as &#x3b1;-quinacridone crystal phase inhibitor

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Bear, DE, United States of America

James Will