Stabilized aqueous solution

Details Stabilized aqueous solution Stabilized aqueous solution

C - Chemistry, Metallurgy

08

L

C08L 35/08 (2006.01) A61C 13/23 (2006.01) A61K 6/00 (2006.01) C08K 3/30 (2006.01) C08K 5/00 (2006.01) C08K 5/17 (2006.01)

Patent

CA 2114541

What is provided herein is a stabilized aqueous solution of a C1-C5 alkyl vinyl ether and maleic acid copolymer which includes about 100 to 1,000 ppm of (1) an additive mixture of (a) about 30-70 % by weight of ethylenediaminetetraacetic acid EDTA and (b) about 30-70 % by weight of a secondary additive which is an organic antioxidant and/or free radical scavenger selected from t-butylhydroquinone, propyl gallate and N,N- diethylhydroxylamine; or (2) 10-500 ppm of an inorganic reducing agent such as sulfur dioxide and salts derived from sulfur dioxide and alkali metals such as sodium or potassium bisulfite, sodium or potassium metabisulfite, sodium or potassium thiosulfite, or sodium or potassium sulfite, said stabilized solution exhibiting a retention of at least about 85-90 % of its original viscosity after 3 months.

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