[C:1]([O:4][CH:5]=[CH2:6])(=[O:3])[CH3:2].[CH3:7][O:8][C:9](=[O:17])[C:10]([S:12]([O:15][CH3:16])(=[O:14])=[O:13])=[CH2:11].N(C(C)(C)C#N)=NC(C)(C)C#N>>[C:1]([O:4][CH:5]=[CH2:6])(=[O:3])[CH3:2].[CH3:7][O:8][C:9](=[O:17])[C:10]([S:12]([O:15][CH3:16])(=[O:14])=[O:13])=[CH2:11]After tempering at 65° C. and an increase in the viscosity of the mixture, a solution of 80 g of vinyl acetate, 20 g of 2-methoxysulphonyl propenoic acid methyl ester (11 mole percent) and 0.4 g of 2,2'-azo-bis-isobutyronitrile was added over a period of 1 hour.
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