Examples of suitable monomers include vinyl aromatic monomers such as styrene, alphamenhyl styrene, and tertiary butyl styrene; vinyl aliphatic monomers such as ethylene, propylene, and 1,3-butadiene; and alkyl esters of acrylic and methacrylic acid having from 1 to 17 carbon atoms in the alkyl group including methyl (meth) acrylate, ethyl (meth) acrylate, butyl (methacrylate, cyclohexyl (meth) ac