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. 08, 2001
Filed:
Jan. 15, 1999
Applicant:
Inventors:
Vicki Flaris, Tyler, TX (US);
David John Mitchell, Kingston, CA;
Assignee:
E. I. du Pont de Nemours and Company, Wilmington, DE (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08L 5/100 ; C08F / ; C08F / ;
U.S. Cl.
CPC ...
C08L 5/100 ; C08F / ; C08F / ;
Abstract
Modified polymers, particularly polyolefins with improved flow over that of polyolefin alone, are produced by reacting polypropylene, maleic anhydride monomer, and a peroxy initiator in a twin-screw extruder. The maleic anhydride monomer is injected as a fluid and is grafted onto the base polypropylene during the degradation/chain scissioning process. Novel, highly-grafted polymers with high melt flow and other useful properties are produced in pellet form.