Patent ID: 7157537

Claim:
A polymer or block copolymer of formula: wherein R 1 is Hydrogen, C 1 –C 4 Alkyl, Cyano, Phenyl or C 1 –C 4 Alkylphenyl; R 2 is the radical of an acylated, branched, trihydric alcohol, the radical of a fully or partially acylated, linear or branched, tetrahydric alcohol, the radical of a fully or partially acylated, linear, penta- or hexa-hydric alcohol, the radical of a fully or partially acylated, linear or cyclic C 4 –C 6 aldose or C 4 –C 6 ketose or the radical of a fully or partially acylated disaccharide; A and B are polymer blocks of ethylenically unsaturated monomer units selected from the group consisting of styrenes, acrolein, acrylic or methacrylic acid or salts thereof, acrylic or methacrylic acid anhydrides, acrylic or methacrylic acid C 1 –C 24 alkyl esters, acrylic or methacrylic acid mono- or di-C 1 –C 4 alkylamino-C 2 –C 4 alkyl esters, acrylic or methacrylic acid hydroxy-C 2 –C 4 alkyl esters, acrylic or methacrylic acid (C 1 –C 4 alkyl) 3 silyloxy-C 2 –C 4 alkyl esters, acrylic or methacrylic acid (C 1 –C 4 alkyl) 3 silyloxy-C 2 –C 4 alkyl esters, acrylic or methacrylic acid heterocyclyl-C 2 –C 4 alkyl esters, acrylic or methacrylic acid esters containing poly-C 2 –C 4 alkylene glycol ester groups, acrylic or methacrylic acid esters containing poly-C 2 –C 4 alkylene glycol ester groups esterified by substituted C 1 –C 24 alkoxy groups, acrylic or methacrylic acid amides, acrylic or methacrylic acid mono- or di-C 1 –C 4 alkylamides, acrylic or methacrylic acid amino-C 2 –C 4 alkylamides and acrylonitrile; x and y denote the number of monomer units in the blocks A and B, one value of x and y being zero and the other value being an integer greater than zero, or both values x and y being integers greater than zero; X is chlorine, bromine or iodine; and m denotes an integer from three to six.