Exxon Research and Engineering Company

Exxonmobile Research and Engineering Company

Louise M Wheeler

Dennis G Peiffer

Hsien-Chang Wang

Pamela Jean Wright

Lewis J Fetters

Joseph Anthony Sissano

Rebecca L Rucker

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 &mdash;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 &mdash; end group with the halogenated polymer leads to graft polymers coupled by a quaternary ammonium or phosphonium groups.

Graft copolymers containing ionomer units

Graft copolymers having cationic units pendant to the backbone chain are disclosed. These polymers are prepared by reacting a polymer containing halogenated paramethylstyrene 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.sub.1 R.sub.2 Z R.sub.3 --Li where R.sub.1 and R.sub.2 are alkyl radicals, R.sub.3 is a direct link or an organic radical and Z is nitrogen or phosphorous. Reaction of the anionically polymerized polymer having an R.sub.1 R.sub.2 Z R.sub.3 --end group with the halogenated polymer leads to graft polymers coupled by a quaternary ammonium or phosphonium groups.

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New Providence, NJ, United States of America

Louise M Wheeler