Patent ID: 8785540
Filing Date: 2014-07-22
Classification: C08F,C08L,C09J

Abstract:
1. An aqueous vinyl ester copolymer dispersion stabilized with at least two polyvinyl alcohols having different molecular weights combined with from 0.05% to 5% by weight, based on the total amount of monomers employed, of at least one emulsifier, said dispersion having a viscosity of less than 8000 mPa*s, a weight average d w of the particle sizes of 0.5 to 10 and a ratio of weight average to number average of the particle sizes, d w /d n , in the range of from 2.5 to 20.0, wherein said copolymer possesses a glass transition temperature of from −20 to +5° C., wherein said at least one emulsifier is selected from the group consisting of ethoxylated, non-ionic emulsifiers, ethoxylated, anionic emulsifiers, or combinations thereof and wherein an aqueous solution of at least one of said at least two polyvinyl alcohols possesses a viscosity at 20° C. of from 18 to 60 mPa*s and an aqueous solution of at least one of said at least two polyvinyl alcohols possesses a viscosity at 20° C. of from 2 to 18 mPa*s.