Narrowing the molecular weight distribution of poly-tetrahydrofuran and of copolymers of tetrahydrofuran and alkylene oxides
US4762951A · kind A · utility
17Cited by
5References
10Claims
0Family size
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Key dates
| Filing date | Mar 4, 1987 |
| Grant date | Aug 9, 1988 |
| Priority date | — |
| Expiry date | Mar 4, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/30
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The molecular weight distribution of polytetrahydrofuran and of copolymers of tetrahydrofuran and alkylene oxides is narrowed by a process in which the polymers are mixed with a solvent mixture consisting of (a) an alkanol, (b) a hydrocarbon and (c) water, the content of the individual components a, b and c in the mixture being from 8 to 60% by weight, after which the three phases formed are separated from one another and the polymer having the narrower molecular weight distribution is isolated from the two lower phases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.