Thermoplastic, elastomeric polystyrene/diorganopolysiloxane bloc

Details Thermoplastic, elastomeric polystyrene/diorganopolysiloxane bloc Thermoplastic, elastomeric polystyrene/diorganopolysiloxane bloc

1979-09-11

1981-04-21

Briggs, Sr., Wilbert J.

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

Synthetic resins

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

525100, 525271, 525288, C08F29702, C08G 7742

Patent

active

042634016

ABSTRACT:
Thermoplastic, elastomeric polystyrene/diorganopolysiloxane block copolymers having the structural formula: ##STR1## wherein each R, which may be the same or different, is selected from the group consisting of methyl, ethyl, n-propyl, phenyl and 3,3,3-trifluoropropyl; each R', all of which are the same, is hydrogen or methyl; A is a divalent hydrocarbon radical, free of aliphatic unsaturation, having from 6 to 45 carbon atoms; each G, which may be the same or different, is a radical selected from the group consisting of those of the structural formulae: ##STR2## wherein b is 0, 1, 2 or 3, ##STR3## wherein R" is hydrogen, methyl or --Si R.sub.3, c is 0, 1 or 2 and R is as above defined; each a, all of which are the same, is 0 or 1; and n and n', which may be the same or different, represent any numbers, the sum of which is between 20 and 500, and m is any number between 1 and 1,500, are prepared by anionic "styrene" polymerization, chain extension with a vinylchlorosilane, and, ultimately, hydrosilylation.

REFERENCES:
patent: 3678126 (1972-07-01), Saam et al.
patent: 4080400 (1978-03-01), Martin
patent: 4145508 (1979-03-01), Bargain et al.

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