Polymerisable compsn. of methyl methacrylate and unsatd. urethane - from hydroxy-alkyl (meth)acrylate and poly:methylene poly:phenyl poly:isocyanate

摘要

A polymerisable compsn. comprises an unsatd. urethane cpd. (I) and methyl methacrylate. (I) is a polyurethane poly-acrylate or polymethacrylate resin derived from a hydroxyalkyl acrylate or methacrylate by reaction of its hydroxyl gps. with a polyisocyanate. The polyisocyanate is a polymethylene poly-phenyl polyisocyanate or a urethane polyisocyanate derived from a polymethylene polyphenyl polyisocyanate by reaction with an aliphatic alcohol having up to 3 hydroxyl gps. Compsn. is used for mould copolymerisation, forming articles, including glass fibre reinforced composites, in 5 mins. or less at temps. of 60 deg. C or below.