| 摘要 |
What is provided herein is a colorless, stabilized aqueous solution of a C1-C5 alkyl vinyl ether and maleic acid copolymer which includes about 100 to 1,000 ppm of an additive mixture of (a) about 30-70% by weight of ethylenediaminetetraacetic acid (EDTA) or its salts, such as the disodium, trisodium, tetrasodium or disodium-calcium salts, 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, butylated hydroxy-anisole (BHA), butylated hydroxy-toluene (BHT), 4-hydroxymethyl-2,6-di-tert-butylphenol, 2,4,5-trihydroxy-butyrophenone (THBP) and N,N-diethylhydroxylamine, said stabilized solution exhibiting a retention of at least about 85-90% of its original viscosity after 3 months. Preferably, the solution is prepared by hydrolyzing the corresponding anhydride in the presence of said additive mixture.
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