WATER RESISTANT UNSATURATED POLYESTER RESIN COMPOSITIONS

摘要

A curable thermoset resin composition useful for imparting water and/or solvent resistance to gel coated fiber-reinforced polymers comprising: (A) at least 5 wt.% of an at least partially end-capped unsaturated polyetherester resin; (B) an unsaturated polyester resin preferably modified with dicyclopentadiene having a ratio of the number average molecular weight to the average number of double bonds per polymer molecule in the range from about 200 to about 400, in an amount such that the weight ratio of polyester resin (B) to polyetherester resin (A) is in the range from about 10:90 to about 90:10; (C) about 10 to about 70 wt.% of at least one vinyl monomer; and (D) a curing agent. The composition is preferably used as a barrier layer between the fiber-reinforced polymer and the gel coat.