ISOCYANATE-TERMINATED PREPOLYMERS FOR THE PRODUCTION OF INTEGRAL POLYURETHANE FOAMS

The invention relates to a method for producing a prepolymer for the production of an integral polyurethane foam. According to the invention, the prepolymer is or can be obtained by reaction of a composition that contains or consists of the following components: component A containing or consisting of a polyoxymethylene-polyoxyalkylene block copolymer having a hydroxyl number according to DIN 53240-2 (November 2007) DIN 53240-1:2013-06 of 20 mg KOH/g to 200 mg KOH/g as component A1, optionally a polymer that is different from component A1 and that has an average number of at least 1.7 Zerewitinoff-active hydrogen atoms and a hydroxyl number according to DIN 53240-2 (November 2007) of 40 mg KOH/g to 80 mg KOH/g as component A2, optionally a compound that is different from components A1 and A2 and has at least two Zerewitinoff-active hydrogen atoms and a molecular weight of 50 to 500 g/mol as component A3, component B containing or consisting of di- and/or polyisocyanates with an NCO content according to EN ISO