Narrowing the molecular weight distribution of polytetrahydrofur

Details Narrowing the molecular weight distribution of polytetrahydrofur Narrowing the molecular weight distribution of polytetrahydrofur

1988-08-15

1990-06-12

Mars, Howard T.

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

Organic compounds

Oxygen containing

568617, C07C 4134, C07C 4138

Patent

active

049335030

ABSTRACT:
The molecular weight distribution of polytetrahydrofuran and of copolymers of tetrahydrofuran and alkylene oxides are narrowed by a process in which low molecular weight fractions are distilled off from the polymers under pressures of less than 0.3 mbar and at from 200.degree. to 260.degree. C., the distillation residue is 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 4 to 60% by weight, the phases formed are then separated from one another and the polymer having a narrower molecular weight distribution is isolated from the phase.

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patent: 4478109 (1984-10-01), Kobelt
patent: 4500705 (1985-02-01), Chopelin
patent: 4510333 (1985-04-01), Pruckmayr
patent: 4585592 (1986-04-01), Mueller
patent: 4762951 (1988-08-01), Mueller

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