Preparation of powdered crosslinked polyalkylene oxides

Details Preparation of powdered crosslinked polyalkylene oxides Preparation of powdered crosslinked polyalkylene oxides

Filed on

1973-06-29

Date issued

1976-05-11

Examiner

Tillman, Murray

Patent Class

Chemistry of carbon compounds

SubClass

Miscellaneous organic carbon compounds

Other Related Categories

260 334R, 260 336UA, 260 338R, 260 338UA, 260901, C08K 501

Type

Patent

Status

active

Patent number

039562247

Description

ABSTRACT:
A process for producing powdered chemically crosslinked poly(alkylene oxide) of molecular weight of at least 100,000 which comprises contacting poly(alkylene oxide) with a suitable crosslinking agent in the presence of a free radical catalyst, and a liquid medium containing a solvent-nonsolvent mixture for said poly(alkylene oxide) wherein the non-solvent portion constitutes at least 35% and up to 100% by weight of the liquid medium, at a temperature and for a time sufficient to crosslink said poly(alkylene oxide).

REFERENCES:
patent: 3498933 (1970-03-01), Fey
patent: 3579611 (1971-05-01), Holub et al.
Davidson et al., "Water Soluble Resins," Second Edition, pp. 197-199, Reinhold Book Corp., New York.

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