Polyurethane-based polymer material having excellent resistance to heat distortion and elongation at tear

A process for the production of a polyurethane material with a heat-deflection temperature of at least 130° C. in three-point bending with 0.45 MPa outer fiber stress in accordance with DIN EN ISO 75, the process comprising:

• mixing components comprising:
• a. di- and/or polyisocyanates,
• b. compounds having hydrogen atoms reactive toward isocyanate groups, where the compounds having hydrogen atoms reactive toward isocyanate groups comprise no compounds having carbon-carbon double bonds,
• c. compounds comprising at least one carbon-carbon double bond,
• d. optionally a catalyst that accelerates a urethane reaction, and
• e. optionally other auxiliaries and additives,
• to give a reaction mixture, and
• hardening the reaction mixture at temperatures above 120° C., where:
• the compounds b) having hydrogen atoms reactive toward isocyanate groups have, per molecule, an average of at least 1.5 hydrogen groups reactive toward isocyanate and
• the compounds (c) comprising at least one carbon-carbon double bond comprise compounds (c1) comprising at least one carbon-carbon double bond and at least one group selected from groups reactive toward isocyanate and isocyanate groups and/or compounds (c2) comprising at least two carbon-carbon double bonds, and
• where the reaction mixture has been stabilized by addition of a free-radical inhibitor such that when the components are mixed at room temperature and the reaction mixture is injected into a metal mold with dimensions of 20 cm×30 cm×0.4 cm controlled to a temperature of 80° C. and is demolded after 60 minutes and cooled to room temperature, the heat-deflection temperature of the polyurethane material in three-point bending with 0.45 MPa outer fiber stress in accordance with DIN EN ISO 75 is at least 25° C. lower than the heat-deflection temperature of an identically produced polyurethane material which is heat-conditioned for a further 120 minutes at 150° C. in an oven after the production process and then is cooled to room temperature.