POLYMER, PROCESS AND COMPOSITION

摘要

There is described a low number average molecular weight (MN< 10 kD) and high glass transition temperature (> 75 °C) copolymer (optionally a solid grade oligomer (SGO)) that comprises (a) at least 20 wt-% of itaconate functional monomer(s), (b) not more than 40 % of a hydrophilic monomer, preferably an acid functional monomer(s) in an amount sufficient to achieve an acid value from 65 to 325 mg KOH per g of solid polymer; (c) optionally not more than 70 % of other monomers not being either (a) or (b), having a max content of vinyl aromatic monomer(s) of 40 wt- % and/or max content of methacrylate(s) of 40 wt-%; where the weight percentages of monomers (a), (b) and (c) are calculated as a proportion of the total amount of monomers in the copolymer being 100 %.