Michael D Greene

US Patent:

57139997, Feb 3, 1998

Filed:

Apr 29, 1996

Appl. No.:

8/639598

Inventors:

Ibraheem T. Badejo - N. Charleston SC
Margot Campos - Charleston SC
Michael J. Greene - Charleston SC
Daphne J. Rice - Charleston SC

Assignee:

Bayer Corporation - Pittsburgh PA

International Classification:

C09B 4800
C09B 6752

US Classification:

106495

Abstract:

This invention relates to a process for the preparation of quinacridone pigments by (a) heating, at a temperature of about 80. degree. C. to about 145. degree. C. , a reaction mixture containing (i) 2,5-dianilinoterephthalic acid, a 2,5-dianilino-3,6-dihydroterephthalic acid ester, and/or a derivative thereof, (ii) about 3 to about 15 parts by weight, per part of component (a)(i), of a dehydrating agent, and (iii) about 0. 1 to about 15 percent by weight, based on component (a)(i), of one or more non-quinacridone pigments, with the proviso that if component (a)(i) is a 2,5-dianilino-3,6-dihydroterephthalic acid ester or a derivative thereof, reaction step (a) additionally comprises an oxidation step; (b) drowning the reaction mixture from step (a) by adding said reaction mixture to about 3 to about 15 parts by weight, per part of component (a)(i), of a liquid in which the quinacridone pigment is substantially insoluble; (c) isolating the quinacridone pigment; (d) optionally, conditioning the quinacridone pigment; and (e) optionally, blending the resultant pigment with one or more quinacridone derivatives.

US Patent:

57282048, Mar 17, 1998

Filed:

Jan 31, 1996

Appl. No.:

8/594197

Inventors:

Abdul Sattar - Mt. Pleasant SC
Michael J. Greene - Charleston SC
Herman Gerson - New York NY

Assignee:

Bayer Corporation - Pittsburgh PA

International Classification:

C09B 6750

US Classification:

106411

Abstract:

This invention relates to water-dispersible phthalocyanine pigment formulations that are mixtures of (a) about 60 to about 99. 5% by weight, based on the total amount of components (a) and (b), of a conditioned metal phthalocyanine pigment, and (b) about 0. 5 to about 40% by weight, based on the total amount of components (a) and (b), of a water-insoluble sulfonated phthalocyanine having the formula Pc(SO. sub. 2 OR). sub. x (I) wherein Pc represents a phthalocyanine moiety; R is H or M, wherein M is a monovalent metal, divalent metal, trivalent metal, or ammonium cation, and x is a from about 0. 2 to about 4.