Process for producing thermosetting resins.

摘要

Thermosetting resins are produced by the polymerization reaction of a cyclic carbonate with a polyvalent isocyanate compound, in the presence of potassium fluoride as a catalyst. If desired, a co-catalyst consisting of polyethylene oxides, cryptands and quaternary onium salts can be used in addition to the potassium fluoride. The thermosetting resins so produced have excellent impact strength and are useful as molded materials and for the production of sheets for various purposes including printed circuit board substrates and automobile body panels.