Patent ID: 8329794
Filing Date: 2012-12-11
Classification: B60C,C08K,Y10T

Abstract:
1. A polymer composition of a compatibilized silica in blends of an emulsion polymerized acrylonitrile butadiene polymer and an emulsion polymerized styrene butadiene polymer, the polymer composition comprising: a. from six percent to ninety percent by weight of a compatibilized silica based on a total solids content of the polymer composition, wherein the compatibilized silica comprises at least one percent by weight of an organosilicon coupling agent based on a weight of the compatibilized silica, wherein the organosilicon coupling agent is derived from an organic silane having the structure:  wherein X is a functional group selected from the group consisting of: an amino group, a polyamino alkyl group, a polysulfide, a thiocyanato group, a halogen, an acryloxy group, and a methacryloxy group, wherein y is an integer equal to or greater than 0, or X is a vinyl functional group wherein y is an integer greater than 0, and wherein Z.sub.1, Z.sub.2, and Z.sub.3 are each independently selected from the group consisting of a hydrogen, an alkoxy, a halogen, and a hydroxyl; b. from ten percent to eighty percent by weight of the emulsion polymerized styrene butadiene polymer; and c. from ten percent to eighty percent by weight of the emulsion polymerized acrylonitrile butadiene polymer, wherein at least ten percent by weight of the emulsion polymerized acrylonitrile butadiene polymer consists of a ratio of acrylonitrile polymer to liquid 1,3-butadiene polymer of 15 parts by weight of acrylonitrile polymer to 50 parts by weight liquid 1,3-butadiene polymer, providing a high strength bond of the compatibilized silica to each of the polymers, wherein butadiene to styrene is in a ratio ranging from 7 parts weight of butadiene to 1 part by weight styrene to 17 parts by weight butadiene to 1 part by weight of styrene and acrylonitrile to butadiene is in a ratio of ranging from 0.04 part by weight of acrylonitrile to 1 part by weight of butadiene to 0.75 part by weight of acrylonitrile to 1 part by weight of butadiene, and wherein silica absorption is from 96 percent to 99 percent of the compatibilized silica and the emulsion polymerized styrene butadiene polymer.