When two or more different monomers are allowed to polymerize together, the product formed is called a copolymer and the process is called copolymerization. Thus, a copolymer contains a large number of units of each monomer used in the same polymeric chain.
Wan Manshol Bin W. Zin has written: 'Graft copolymerisation of methyl methacrylate on to natural rubber'