Narrowing the molecular weight distribution of poly-tetrahydrofu

Details Narrowing the molecular weight distribution of poly-tetrahydrofu Narrowing the molecular weight distribution of poly-tetrahydrofu

1987-03-04

1988-08-09

Anderson, Harold D.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568621, 528417, 528496, C07C 4211, C08G 5968, C08G 6532

Patent

active

047629517

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.

REFERENCES:
patent: 3478109 (1969-11-01), McConnell
patent: 3925484 (1975-12-01), Baker
patent: 4251654 (1981-02-01), Robinson et al.
patent: 4500705 (1985-02-01), Copelin
patent: 4510333 (1985-04-01), Pruckmayr

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