Patent ID: 7491766
Filing Date: 2009-02-17
Classification: C08F,C08L,C09J

Abstract:
1. An aqueous emulsion, comprising a polymer dispersed in a polyvinyl alcohol containing an acetoacetic ester group and 5 to 1000 ppm of an iron compound, said polymer being a homopolymer obtained by polymerizing a (meth)acrylic acid or its ester in the presence of the polyvinyl alcohol containing an acetoacetic ester group or a copolymer obtained by polymerizing two or more kinds of (meth)acrylic acids or (meth)acrylic esters in the presence of the polyvinyl alcohol containing an acetoacetic ester group; wherein said polyvinyl alcohol containing an acetoacetic ester group has block character [η] of 0.3 to 0.6, hydrolysis degree of at least 97% by mol and acetoacetic esterification degree of 0.01 to 1.5% by mol, the value obtained by dividing the maximum value by the minimum value of the respective average acetoacetic esterification degree for each of said polyvinyl alcohol containing an acetoacetic ester group separated by particle size of 44 to 74, 74 to 105, 105 to 177, 177 to 297, 297 to 500 and 500 to 1680 μm is 1.0 to 3.0, and wherein said aqueous emulsion is characterized in that the amount of coarse particles in the aqueous emulsion is at most 0.002% by weight of solid of the emulsion.