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Abstract

The present invention relates to a one-component reaction system for producing hard polyurethane foams, comprising the following constituents: A) an organic polyisocyanate component which is partially or entirely in prepolymer form, B) an isocyanate-reactive component, the functional groups of which are exclusively those having at least one Zerewitinoff-reactive hydrogen atom and optionally having at least one halogen atom, C) at least one stabilizer, D) at least one catalyst suitable for catalysing the reaction of the polyisocyanate component A) with the isocyanate-reactive component B), and E) optionally auxiliaries and additives and blowing agents and co-blowing agents, the reaction system being characterized in that the content of monomeric polyisocyanate is at most 1% by weight, and in that the organic polyisocyanate component A) has an isocyanate content of less than 8% by weight relative to the polyisocyanate component A). The invention also relates to a method for producing a one-component reaction system, to a method for producing hard polyurethane foams from a one-component reaction system, to a hard foam obtainable from a one-component reaction system, to the use of a one-component reaction system as a one-component installation foam, and to a pressure container containing a reaction system and a blowing agent.

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First Claim