Doreswamy R Iyengar

US Patent:

47894040, Dec 6, 1988

Filed:

Sep 17, 1986

Appl. No.:

6/908217

Inventors:

Doreswamy R. Iyengar - Ann Arbor MI
James J. Krikke - Hudsonville MI

Assignee:

BASF Corporation - Parsippany NJ

International Classification:

C04B 1400

US Classification:

106408

Abstract:

A process for preparing a soft textured high strength Alkali Blue pigment toner comprising preparing an initial mixture from an alkali metal hydroxide, Alkali Blue pigment, resin, oil or varnish, free fatty acid and water and adding a mineral acid to said mixture to precipitate the pigment product.

US Patent:

50266276, Jun 25, 1991

Filed:

Jun 11, 1990

Appl. No.:

7/536050

Inventors:

Doreswamy R. Iyengar - Ann Arbor MI
Thomas L. Praamsma - Holland MI

Assignee:

BASF Corporation

International Classification:

G03C 500

US Classification:

430331

Abstract:

The alkali blue dry toner comprises 60 to 98 weight percent alkali blue pigment particles, 1 to 20 weight percent of di- and tri-decyl phosphate esters of free acids, and 1-20 weight percent of dehydroabietyl amine. The toner exhibits a high strength and soft texture in comparison with prior art pigment compositions made from similar ingredients.