Patent ID: 7943709

Claim:
A method of manufacturing a copolymer, the method comprising: polymerizing at least one alkene monomer in the range of 0.1 to 30 mole %, at least one acrylate monomer in the range of 30 to 99 mole % and at least one the carboxylic acid monomer in the range of 0.1 to 50 mole having one or more double bonds in the presence of a metal oxide represented by the following Formula 5 by using a radical polymerization initiator: M x N y O z Formula 5 wherein M is one or more selected from the group consisting of alkali earth metal, transition metal, Group 13 metal and Group 14 metal; N is a Group 5 or 6 atom; O is an oxygen atom; and x, y and z are values that are determined by an oxidation state of M and N with x>0, y>0, and z>0.