Patent ID: 8530533
Filing Date: 2013-09-10
Classification: C08G,Y10T

Abstract:
1. A rigid polyurethane foam comprising a reinforcing material homogeneously distributed therein, where the mean density of the polyurethane foam without reinforcing material is in the range 50-200 g/l, said rigid polyurethane foam comprising a reinforcing material homogeneously distributed therein being obtained by mixing a) isocyanates, b) compounds having groups which are reactive toward isocyanates, c) blowing agents comprising water, d) a catalyst mixture comprising tertiary amines and, optionally, e) further additives, thereby forming a reaction mixture, applying the reaction mixture to a reinforcing material and curing the reaction mixture, wherein the isocyanates (a) have a viscosity of less than 500 mPas at 25° C., the compounds (b) having groups which are reactive toward isocyanates comprise a polyetherol (b1) having a functionality of 4 or more and a viscosity at 25° C. of 10000 mPas or less and a polyetherol (b2) having a functionality of 3 or less and a viscosity at 25° C. of 500 mPas or less, and the reinforcing material is a fiberglass mat or a carbon fiber mat.