Elastomeric organopolysiloxane block copolymers and non-elastomeric organosilicic copolymer blocks therefor
US4233427A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 1979 |
| Grant date | Nov 11, 1980 |
| Priority date | — |
| Expiry date | Jan 16, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G77/48
- WIPO fieldChemical engineering
- WIPO sectorChemistry
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: EQU 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 EQU 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 PA1 the symbols A, which are identical, represent linear or branched chain alkylene radicals having from 2 to 6 carbon atoms, or cyclohexylene radicals; PA1 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; PA1 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 …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.