Silyl-functional pseudo-telechelic polyisobutylene terpolymers
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United States of America Patent
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Jul 31, 2001
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N/A
app pub date -
Oct 3, 2000
filing date -
Oct 3, 2000
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Abstract
A method for preparing a moisture-curable, pseudo-telechelic, silyl-functional polyisobutylene terpolymer is disclosed, said method comprising reacting, in the presence of a Lewis acid and a solvent, (A) an isobutylene monomer; (B) a isopropenylphenyl comonomer having the formula ##STR1## (C) a vinylphenyl comonomer of the formula ##STR2## wherein R' is a divalent non-aromatic hydrocarbon group having 2 to 6 carbon atoms, R' is independently selected from alkyl groups having 1 to 10 carbon atoms or aryl groups having 6 to 10 carbon atoms, R is a divalent non-aromatic hydrocarbon group having 2 to 6 carbon atoms, X is independently a hydrolyzable group and n is independently 1, 2 or 3, with the proviso that r.sub.AC is greater than 1 and r.sub.AB is less than 1, wherein r.sub.AB is the reactivity ratio of said isobutylene in the presence of said comonomer (B) and said solvent and r.sub.AC is the reactivity ratio of said isobutylene in the presence of said comonomer (C) and said solvent.
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