Process for removing catalyst residues from polyolefins

Details Process for removing catalyst residues from polyolefins Process for removing catalyst residues from polyolefins

1977-07-06

1979-02-27

Levin, Stanford M.

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

Synthetic resins

Treating polymer containing material or treating a solid...

526351, 528494, C08F 624

Patent

active

041420390

ABSTRACT:
In purifying polyolefins obtained by suspension polymerization to remove catalyst residues therefrom, the polymer is first separated from the polymerization medium and then degassed in the absence of air. Next the degassed polymer is deactivated by suspension in a liquid medium comprising a liquid hydrocarbon, an aliphatic alcohol having 1 to 4 C atoms, and an organic chloride which is an acid chloride or an alkyl chloride, the suspension being at a temperature of +30, +65.degree. C. Finally the deactivated polymer is separated from the liquid medium and washed with an aliphatic alcohol and/or a liquid hydrocarbon.

REFERENCES:
patent: 3271372 (1966-09-01), Caywood

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