Patent ID: 8940803
Filing Date: 2015-01-27
Classification: C08G

Abstract:
1. A rigid polyurethane foam obtained by mixing (a) isocyanates, (b) compounds having groups which are reactive toward isocyanates, (c) a blowing agent, wherein water is the sole blowing agent, (d) catalysts and optionally (e) further additives to form a reaction mixture, applying the reaction mixture to a reinforcing material and curing the reaction mixture, wherein the isocyanates (a) have a viscosity of not more than 500 mPas at 25° C. and 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 10 000 mPas or less, a polyetherol (b2) having a functionality of 3.5 or less and a viscosity at 25° C. of 600 mPas or less, a polyesterol (b3) having a viscosity at 25° C. of 2000 mPas or less, chain extenders (b4) comprising at least 30% secondary OH groups and optionally a crosslinker (b5).