Process for reducing the residual monomer content in the polymer

Details Process for reducing the residual monomer content in the polymer Process for reducing the residual monomer content in the polymer

1978-06-27

1980-01-08

Wong, Jr., Harry

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

Synthetic resins

Treating polymer containing material or treating a solid...

526264, 528481, C08F 610, C08F21804, C08F21808

Patent

active

041828518

ABSTRACT:
A process for reducing the residual monomer content of a copolymer prepared by copolymerizing vinyl esters and N-vinyl-lactams in a solvent in the presence of a free radical polymerization initiator. Following the main polymerization, from 0.05 to 0.5% by weight, based on the monomers employed, of di-tert.-butyl peroxide, di-tert.-amyl peroxide, dicumyl peroxide, 2,5-dimethyl-2,5-bis-(tert.-butylperoxy)-hexane, 2,2-bis-(tert.-butylperoxy)-butane, 1,1-bis-(tert.-butylperoxy)-3,3,5-trimethylcyclohexane, 4,4-di-(tert.-butylperoxy)-butyl valerate, or a mixture of these, is added to the reaction mixture and the after-polymerization is carried out at a higher temperature than the main polymerization.

REFERENCES:
patent: 2497705 (1950-02-01), Werntz
patent: 2665271 (1954-01-01), Beller
patent: 2667473 (1954-01-01), Morner et al.
patent: 2914516 (1959-11-01), Siggia et al.
patent: 4020267 (1977-04-01), Park

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