Patent ID: 6429251
Filing Date: 2002-08-06
Classification: C04B,C08F

Abstract:
An emulsifier- and solvent-free copolymer, stabilized with nonionic polyvinyl alcohol as a protective colloid, of 1,3-butadiene and/or isoprene with a methacrylate of a C1-10 straight chain or branched alcohol and/or an acrylate of a C1-10 straight chain or branched alcohol, in the form of its aqueous polymer dispersion or polymer powder redispersible in water, obtainable by emulsion polymerization and optionally drying of the polymer dispersion obtainable thereby, from 10 to 100% by weight of the amount of polyvinyl alcohol being initially introduced before the initiation of the polymerization and the remaining amount being metered in during polymerization, and the addition of the polyvinyl alcohol and of the comonomers being controlled in such a way that, during the polymerization, the amount of protective colloid is always from 1 to 70% by weight of the total amount of free comonomers.