In another embodiment, (gamma-methacryloxypropyl)silanes, in which R10 is a methyl or a phenyl group; and R11 is a methyl, ethyl, or an isopropyl group can be used in the impact modifier compositions disclosed herein. (Gamma-methacryloxypropyl)dimethoxymethylsilane and (Gamma-methacryloxypropyl)trimethoxysilane are particularly convenient and versatile first graft link monomers due to their ready