The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 19, 1998
Filed:
May. 13, 1996
Applicant:
Inventors:
Thomas R Flatt, Summerville, SC (US);
Mark W Johnson, Goose Creek, SC (US);
Assignee:
Bayer Corporation, Pittsburgh, PA (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C09B / ;
U.S. Cl.
CPC ...
106495 ; 106493 ; 106494 ; 106498 ; 546 37 ;
Abstract
This invention relates to pigment compositions prepared by precipitating a blend of (a) about 60 to about 95 percent by weight of a perylene pigment having the formula ##STR1## wherein R.sup.1 and R.sup.2 are independently C.sub.1 -C.sub.6 alkyl, C.sub.5 -C.sub.7 cycloalkyl, C.sub.7 -C.sub.16 aralkyl, or C.sub.6 -C.sub.10 aryl; and (b) about 5 to about 40 percent by weight of a polycyclic aromatic compound containg at least 5 aromatic rings wherein at least one ring is substituted with at least one keto group.