Patent ID: 7141613

Claim:
A rigid polyurethane foam obtained by reacting a) an isocyanate group-containing component, with b) a component having a flashpoint according to DIN EN 22719 below 55° C., comprising b1) at least one substance which is inert toward an isocyanate, does not have an ozone-destroying effect, and has a boiling point below 100° C., b2) a reaction product of at least one compound having an aromatic ring, at least one aldehyde or ketone and at least one primary or secondary amine, b3) optionally, at least one isocyanate-reactive component which contains polyester groups, b4) optionally, at least one compound which is capable of reacting with the isocyanate and does not correspond to component b2 or b3, and b5) optionally, at least one additive required for the production of a foam.