Patent ID: 8501323

Claim:
An in-mold process for the production of a synthetic resin composite material with a polyurethane gel coat, wherein the process comprises (i) mixing a polyol component (A) and a polyisocyanate component (B) and at least partially curing the resultant mixture to form a gel coat resin system; (ii) introducing the gel coat resin system into a mold; and (iii) applying a synthetic resin that comprises at least one of an epoxy resin and a vinyl ester resin and further comprises an inorganic or organic nonwoven or fabric reinforcing material onto the gel coat resin system, the synthetic resin being not, or at least not completely cured at the time it is contacted with the gel coat resin system and the gel coat resin system being not completely cured at the time it is contacted with the synthetic resin; and wherein polyol component (A) is a mixture that comprises (i) one or more polyols and (ii) one or more aromatic amines, and comprises from 0.5 to 10 mol of hydroxyl groups per kg of component (A); and polyisocyanate component (B) comprises one or more aromatic polyisocyanates.