Patent ID: 6576698
Filing Date: 2003-06-10
Classification: C08F

Abstract:
A process for the preparation of polyvinyl alcohol-stabilized polymers based on vinyl ester, (meth)acrylate and optionally ethylene monomers in the form of their aqueous dispersions and dispersion powders redispersible in water, by means of free radical emulsion polymerization or suspension polymerization of one or more monomers selected from the group consisting of the esters of acrylic acid and methacrylic acid with vinyl esters, optionally ethylene and optionally further monomers copolymerizable therewith, in the presence of one or more polyvinyl alcohol protective colloids, and optionally drying of the aqueous dispersion obtained thereby, whereina) from 50 to 100% by weight of the total weight of vinyl ester monomers employed, from 0 to 40% by weight of the total weight of (meth)acrylate monomers employed and at least 80% by weight of the total weight of ethylene employed are initially introduced in the polymerizations and b) the polymerization is carried out at a temperature of &gE;60Â° C.