Process for the color stabilization of an aqueous N-vinyl hetero

Details Process for the color stabilization of an aqueous N-vinyl hetero Process for the color stabilization of an aqueous N-vinyl hetero

1994-12-13

1996-07-09

Michl, Paul R.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

523328, 523330, 526264, C08K 53415

Patent

active

055345646

ABSTRACT:
This invention relates to a process for the production of a substantially odorless, color stable N-vinyl heterocyclic copolymer in pure deionized water or in aqueous alcoholic solution which includes contacting an alcohol solution of the copolymer, under reduced pressure, at alcohol reflux temperature with water and a reducing agent selected from the group of a nitrogen containing borane complex, sulfurous acid and/or an alkali metal salt of sulfurous acid and recovering an aqueous, 10-80 wt. % solids solution of the copolymer having a substantially color free stability for a period of more than a year.

REFERENCES:
patent: 2634259 (1953-04-01), Ney et al.
patent: 2872433 (1959-02-01), Glickman et al.
patent: 4320114 (1982-03-01), Denzinger et al.
patent: 5126395 (1992-06-01), End et al.
patent: 5319041 (1994-06-01), Zhong et al.

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