Fractionation of polymers

Details Fractionation of polymers Fractionation of polymers

1983-10-20

1985-05-21

Henderson, Christopher A.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

5253261, 528487, 528492, C08F 604

Patent

active

045187690

ABSTRACT:
Process of obtaining a high molecular weight fraction from a polar polymer which comprises the steps of first, forming a solution of the polar polymer in a solvent which is also a solvent for a selected coacervating substance, then mixing with the solution a coacervating substance having at least two proton donating or proton receiving groups which are opposite the polarity of the polar polymer in an amount sufficient to crosslink molecules of said polar polymer of a molecular weight above a selected range at the solution temperature, thereby forming coacervated high molecular weight polymer solids, and then separating the high molecular weight solids from the solution. The coacervated polymer may then be dissolved and the coacervating substance removed by precipitation.

REFERENCES:
patent: 3679638 (1972-07-01), Korsgen
patent: 3701764 (1972-10-01), Hargitay
patent: 3790538 (1974-02-01), Schon
patent: 3843585 (1974-10-01), Kangas

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