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:
Dec. 30, 2003
Filed:
Oct. 31, 2002
Applicant:
Inventors:
Rimantas Glemza, Baltimore, MD (US);
Dean A. Denton, Baltimore, MD (US);
Assignee:
W. R. Grace & Co.-Conn, Columbia, MD (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01J 2/108 ;
U.S. Cl.
CPC ...
B01J 2/108 ;
Abstract
High melt index polyolefins have been obtained with chromium silica catalysts under conventional polymerization conditions without the use of titanium or other additives. The useful chromium silica catalysts have a pore volume in the range of 1.9-2.9 cc/g and a narrow pore size distribution. The silica is a silica gel preferably obtained from a low solids, rapid gelation process.