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. 14, 2002
Filed:
Mar. 03, 2000
Dennis G. Peiffer, Annandale, NJ (US);
Hsien-Chang Wang, Bellaire, TX (US);
Pamela Jean Wright, Easton, PA (US);
Joseph A. Sissano, Leonardo, NJ (US);
Lewis J. Fetters, Annandale, NJ (US);
Louise M. Wheeler, New Providence, NJ (US);
Rebecca L. Rucker, Warren, NJ (US);
ExxonMobile Research and Engineering Company, Ananadale, NJ (US);
Abstract
Graft copolymers having cationic units pendant to the backbone chain are disclosed. These polymers are prepared by reacting a polymer containing halogenated para-methylstyrene units in the chain, e.g., a brominated copolymer of isobutylene and para-methylstyrene, with an anionically polymerized polymer made using an organolithium initiator compound having the formula R R Z R —Li where R and R are alkyl radicals, R is a direct link or an organic radical and Z is nitrogen or phosphorous. Reaction of the anionically polymerized polymer having an R R Z R — end group with the halogenated polymer leads to graft polymers coupled by a quaternary ammonium or phosphonium groups.