Patent ID: 8906999

Claim:
A polymerizable thermosetting unsaturated polyester resin composition containing no styrene monomer, comprising: a) an unsaturated polyester polymer containing at least two strained cycloolefinic double bonds, which can be cross-linked through a ring-opening metathesis polymerization (ROMP); and b) a catalyst system for the ring-opening metathesis polymerization; wherein the unsaturated polyester polymer containing at least two strained cycloolefinic double bonds is the reaction product of a norbornene compound containing functional groups or linkages selected from the group consisting of alcohol, carboxylic acid, ester and anhydride, with a glycol or polyhydric alcohol, and a di- or polycarboxylic acid or anhydride, and has a weight average molecular weight of at least about 1000 and a polydispersity greater than or equal to about 2.