Elastomeric organopolysiloxane block copolymers and non-elastomeric organosilicic copolymer blocks therefor

Abstract

Thermoplastic, crystalline block copolymers are disclosed, each comprising a plurality of recurring units selected from the group consisting of those of the structural formulae F.sub.1 and F'.sub.1, and combinations thereof: F.sub.1 : --A [SiR.sub.2 (GSiR.sub.2).sub.a ASiR.sub.2 G'SiR.sub.2 A].sub.p SiR.sub.2 (GSiR.sub.2).sub.a ASiR.sub.2 (OSiR.sub.2).sub.n ] and F'.sub.1 : --A [SiR.sub.2 G'SiR.sub.2 ASiR.sub.2 (GSiR.sub.2).sub.a A].sub.p SiR.sub.2 G'SiR.sub.2 ASiR.sub.2 (OSiR.sub.2).sub.n ] in which the symbols A, which are identical, represent linear or branched chain alkylene radicals having from 2 to 6 carbon atoms, or cyclohexylene radicals; the symbols R, which are identical or different, represent alkyl and halogenoalkyl radicals having from 1 to 5 carbon atoms, cycloalkyl and halogenocycloalkyl radicals having from 3 to 8 carbon atoms, aryl and halogenoaryl radicals having from 6 to 8 carbon atoms or cyanoalkyl radicals having from 3 to 4 carbon atoms; the symbols G, which are identical, represent linear or branched chain alkylene radicals having from 1 to 8 carbon atoms, divalent organic radicals corresponding to the formula F.sub.2 : --CH.sub.2).sub.x QTQ(CH.sub.2 --.sub.x, in which the symbols Q, which are identical, represent one of the groups --O-- and --OCO--, the --OCO-- being bonded to T by the --CO-- radical, the symbol T represents a monocyclic, divalent hydrocarbon radical having from 6 to 8 carbon atoms, or a divalent organic radical which has from 10 to 22 carbon atoms and consists of 2 hydrocarbon rings which are fused to one another or bonded together by a valence bond or by one of the groups of the formulae --O--, --CH.sub.2 --, --C(CH.sub.3).sub.2 -- and -Si(R'--.sub.2, wherein R' is an alkyl radical having from 1 to 3 carbon atoms, and the symbols x, which are identical represent 1, 2 or 3, or divalent hydrocarbon radicals corresponding to the formula F.sub.3 : --CH.sub.2).sub.b T(CH.sub.2).sub.b, in which the symbol T has the measuring given for the formula F.sub.2 and the symbols b, which are identical, represent 0 or 1; s the symbols G', which are identical, have the meaning given above for G, except that they do not correspond to the formula F.sub.2 ; the symbols a, which are identical, represent 0 or 1; the symbols p represents any number ranging from 1 to 120; and the symbol n represents any number ranging from 1 to 1,500.

Dependencies are inferred from the claim text.