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