Dual functional linear siloxanes, step-growth polymers derived therefrom, and methods of preparation thereof
US8952118B2 · kind B2 · utility
6Cited by
8References
27Claims
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Key dates
| Filing date | Aug 8, 2012 |
| Grant date | Feb 10, 2015 |
| Priority date | — |
| Expiry date | Aug 8, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G77/20
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Linear siloxane polymers having low viscosities, precise molecular weights and two distinct polymer termini are provided. Preferred viscosities are greater than 5 cSt and less than 20,000 cSt, and the preferred functionalities at the polymer termini are one hydrogen and one vinyl group, each attached to a silicon atom. Methods for producing such siloxane polymers are also described In the presence of catalysts, such as Pt0 complexes, these siloxanes undergo step-growth polymerization to form elastomers at temperatures below 150° C.
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