Process for minimizing residual monomers

Details Process for minimizing residual monomers Process for minimizing residual monomers

1993-11-02

1995-07-04

Michl, Paul R.

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

Synthetic resins

Treating polymer containing material or treating a solid...

523307, 523309, 523326, 523328, 523343, C08F 610, C08G 6388, C08J 303

Patent

active

054301270

ABSTRACT:
Aqueous emulsions, at least 80% of which have been polymerized, are treated by a process which comprises the separate steps of: a) initially treating the emulsion with a sufficient amount of a free radical generator in an amount and for a time sufficient to reduce the residual monomer content to from about 1500 to about 6000 part per million, and b) subsequently subjecting the emulsion to steam stripping under vacuum, without significantly degrading or destabilizing the emulsion, to thereby reduce the residual monomer content to from about 5 to about 500 parts per million.

REFERENCES:
patent: 3380851 (1968-04-01), Lindemann et al.
patent: 3404112 (1968-10-01), Lindemann et al.
patent: 3454542 (1968-08-01), Cheape, Jr. et al.
patent: 3708388 (1973-01-01), Lindemann et al.
patent: 4164489 (1979-08-01), Daniels et al.
patent: 4529753 (1985-07-01), Taylor
patent: 5268437 (1993-12-01), Holy et al.

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