Abstract: A method of compatibilizing a blend of at least a hydrocarbon polymer with at least one other polymer which is incompatible with the hydrocarbon polymer, said method comprising adding to the polymer blend a compatibilizer which is an isoolefin/para-alkylstyrene copolymer represented by the formula ##STR1## in which R and R' can be hydrogen, alkyl, and the primary and secondary alkyl halides, "a" ranges from about 14 to about 70,000, "b" ranges from 0 to about 70,000, "c" ranges from 0 to about 70,000, "d" ranges from about 1 to about 70,000, X is a halogen, and Nu is a nucleophilic residue provided by a polymeric nucleophile.

Abstract: Graft copolymers which are isoolefin/para-alkylstyrene copolymer represented by the formula ##STR1## in which R and R' can be hydrogen, alkyl, and the primary and secondary alkyl halides, "a" ranges from about 14 to about 70,000, "b" ranges from 0 to about 70,000, "c" ranges from 0 to about 70,000, "d" ranges from about 1 to about 70,000, X is a halogen, and Nu is a nucleophilic residue provided by a polymeric nucleophile.

Abstract: Functionalized copolymers of a C.sub.4 to C.sub.7 iso-olefin and para-alkylstyrene are provided which are prepared by a nucleophilic displacement of at least a portion of benzylic halogen present in the alkyl styrene moiety with an S--R.sup.2 (OH).sub.n nucleophile, R.sup.2 being C.sub.1 to C.sub.20 hydrocarbyl and n being an integer from 1 to 10. Polymer blends based on a mixture of a polar polymer and a functionalized isobutylene/para-alkylstyrene copolymer are also provided, wherein at least a portion of the benzylic halogen present in the alkyl styrene moiety is displaced by OH, S--R.sup.2 (OH).sub.n or N(H).sub.2-m ((R3)OH).sub.m, R.sup.3 being C.sub.1 to C.sub.20 hydrocarbyl and m being 1 or 2.

Abstract: The present invention relates to a novel compound, its use as an initiator in anionic polymerizations yielding norbornene-terminated homopolymers of block copolymers, and the further use of said norbornene-terminated polymers as macromonomers in the preparation of graft copolymers.

Abstract: A copolymer of a C.sub.4 to C.sub.7 isoolefin and a para-alkylstyrene is provided as well as the corresponding halogenated, functionalized and grafted derivatives thereof. Processes for producing these copolymers are also provided.

Abstract: A method for preparing functionalized polymers formed by anionic polymerization, e.g., polystyrene, polyisoprene, etc., generally comprising the steps of conducting anionic polymerization, reacting the formed polymer with a sterically hindering compound such as 1,1-diphenylethylene, in the presence of a polar diluent, such as tetrahydrofuran, and then contacting the polymer so formed with CO.sub.2.

Abstract: A method for preparing functionalized polymers formed by anionic polymerization, e.g., polystyrene, polyisoprene, etc., generally comprising the steps of conducting anionic polymerization, contacting the polymer so formed with CO.sub.2 in the presence of a polar diluent, then conducting an ion-exchange reaction between the carbonated polymer product and a hydrocarbon soluble salt.