Block copolymers of polyisobutylene and polydimethylsiloxane

Details Block copolymers of polyisobutylene and polydimethylsiloxane Block copolymers of polyisobutylene and polydimethylsiloxane

1997-02-03

1998-04-21

Marquis, Melvyn I.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525479, 528 37, C08F 800

Patent

active

057418594

ABSTRACT:
The present invention relates to a method for preparing a polyisobutylene-siloxane block copolymer, said method comprising:
(I) lithiating
(A) a polyisobutylene having one or two terminal silanol groups with
(B) an organolithium compound;
(II) reacting the silanolate-functional polyisobutylene obtained in step (I) with
(C) a hexaorganocyclotrisiloxane; and
(III) capping the siloxanotate-functional block copolymer obtained in step (II) with a compound selected from
(D) a silane having at least one hydrolyzable group or
(E) an acid.

REFERENCES:
Journal of Applied Polymer Science: Applied Polymer Symposium 39, 21-35 (1984) `New Telechelic Elastomers`; Joseph P. Kennedy.
J. Macromol. Sci.-Chem., A24(9), pp. 1033-1049 (1987); Synthesis of Polydimethylsiloxane . . .

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