The graft polymerization precursor 1, wherein at least 50% by weight of said {HEAD ~ vinyl monomer component} consists of methacrylic ester monomers, {TAIL ~ acrylic ester monomers} or mixtures thereof 
consists of
The graft polymerization precursor 1 , wherein at least 50 % by weight of said { HEAD ~ vinyl monomer component } consists of methacrylic ester monomers , { TAIL ~ acrylic ester monomers } or mixtures thereof
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH