Process for making anionic polymeric di-and polyfunctional polymers using protected functional initiators
US6103846A · kind A · utility
12Cited by
4References
19Claims
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Key dates
| Filing date | May 5, 1999 |
| Grant date | Aug 15, 2000 |
| Priority date | — |
| Expiry date | May 5, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F36/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The preparation of di- or polyfunctional polymers by anionic polymerization using functionalized initiators having the structure R.sup.1 R.sup.2 R.sup.3 Si--A--B, wherein each R is methyl and A is a hydrocarbon bridging group containing from 1 to 25 carbon atoms, and B is an alkali metal, is improved when polymerization occurs in the presence of a polymerization termination inhibitor which is a metal alkyl which has been added at a concentration to afford a molar ratio of the termination inhibitor to living polymer chain ends of about 0.1:1 to about 10:1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.