Graft copolymerization process
First Claim
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1. A method for grafting styrene monomer in high grafting efficiency onto an elastomeric isobutylene-conjugated diene copolymer which comprises the steps of:
- (a) forming a solution of the elastomer in an inert hydrocarbon solvent;
(b) treating said solution with an organolithium chelating polyamine composition whereby a polymer lithium polyamine complex is formed;
(c) treating said complex with from 2 to 50 volume % of an organic monoether or polyfunctional ether whereby unreacted organolithium polyamine is decomposed; and
(d) contacting the styrene monomer with the treated complex of step (c) whereby a graft copolymer is formed, at least a major proportion of the reacted styrene monomer being present in said graft copolymer, and said copolymer is a thermoelastomer.
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Abstract
Novel graft copolymers of isobutylene-conjugated diene copolymeric backbones are prepared employing polymer lithiation wherein the polymeric lithiated complex is treated with an ether compound prior to a graft copolymerization reaction with styrene monomer whereby improved grafting efficiencies are obtained.
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Citations
19 Claims
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1. A method for grafting styrene monomer in high grafting efficiency onto an elastomeric isobutylene-conjugated diene copolymer which comprises the steps of:
- (a) forming a solution of the elastomer in an inert hydrocarbon solvent;
(b) treating said solution with an organolithium chelating polyamine composition whereby a polymer lithium polyamine complex is formed;
(c) treating said complex with from 2 to 50 volume % of an organic monoether or polyfunctional ether whereby unreacted organolithium polyamine is decomposed; and
(d) contacting the styrene monomer with the treated complex of step (c) whereby a graft copolymer is formed, at least a major proportion of the reacted styrene monomer being present in said graft copolymer, and said copolymer is a thermoelastomer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
- (a) forming a solution of the elastomer in an inert hydrocarbon solvent;
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