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:
Jan. 26, 1999
Filed:
Sep. 29, 1997
Anthony J DeNicola, Jr, Newark, DE (US);
Cheng Q Song, Wilmington, DE (US);
Montell North America Inc., Wilmington, DE (US);
Abstract
A graft copolymer comprising a backbone of a propylene polymer material having a vinyl monomer graft polymerized thereto is produced by (1) treating a propylene polymer material with a free radical polymerization initiator, (2) treating the propylene polymer material with at least one grafting monomer capable of being polymerized by free radicals, and (3) removing any unreacted grafting monomer from the graft copolymerized propylene polymer material, decomposing any unreacted initiator, and deactivating any residual free radicals in the material, wherein (1) and (2) are carried out in the presence of a continuous feed of nitric oxide. The nitric oxide reduces the build-up of polymer deposits on reactor walls and gas circulation loops while having almost no effect on the graft copolymerization reaction.