[C:1]1(=[O:7])[O:6][C:4](=[O:5])[CH:3]=[CH:2]1.[CH3:8][O:9][CH:10]=[CH:11][O:12][CH3:13].C(O)(=[O:17])C=C.[CH3:19][C:20]([C:23]([O:25]OC(C)(C)C)=[O:24])(C)C>C(C(C)=O)C>[CH3:8][O:9][CH:10]=[CH:11][O:12][CH3:13].[C:1]([OH:6])(=[O:7])/[CH:2]=[CH:3]\[C:4]([OH:17])=[O:5].[C:23]([OH:25])(=[O:24])[CH:20]=[CH2:19]The preparation of copolymer 4 is repeated, except that the reactor is charged with 3.9 g of maleic anhydride, 3.5 g of 1,2-dimethoxyethylene, 1.4 g of acrylic acid and 133 g of methyl ethyl ketone, and a solution of 35.3 g of maleic anhydride in 57 g of methyl ethyl ketone is then metered in at the same time as 31.7 g of 1,2-dimethoxyethylene, 13 g of acrylic acid and 1.1 g of tert-butyl perpivalate (75% strength in aliphatic hydrocarbon) in 20 g of methyl ethyl ketone. The workup leaves a solution of the polysodium salt of a copolymer of 1,2-dimethoxyethylene, maleic acid and acrylic acid having a solids content of 20%. The K value of the copolymer is 51.7. The amount of residual maleic acid in the copolymer is found to be 0.19%.
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