• Suitable polyaddition polymers other than methyl methacrylate include any of those made from the following monomers including acrylic monomers, including acrylic acidand their alkyl esters, such as, ethyl methacrylate, butyl methacrylate, ethyl acrylate, butyl acrylate, hexyl acrylate, n-octyl acrylate, lauryl methacrylate, 2-ethylhexyl methacrylate, nonyl acrylate, benzyl methacrylate; the hydrox