UNSATURATED POLYESTER

摘要

The present invention relates to a resin composition comprising (a) an unsaturated polyester resin having a molecular weight Mn of at least 750 Dalton and at most 5000 Dalton and (b) a reactive diluent, wherein the unsaturated polyester resin comprises C5-C10 unsaturated diacid building blocks and isosorbide building blocks. Preferably, at least part of the isosorbide is derived from a non-fossil source. Preferably, itaconic acid or anhydride is used as the C5 unsaturated dicarboxylic acid.