Basf Aktiengesellschaft

Rolf Illguth

Dietrich Scherzer

Ulrich Treuling

Bernd Bruchmann

Sarbananda Chakrabarti

Klaus Wagner

Ludwig Jung

Preparation of polyurethane foams

In a process for producing foams based on polyisocyanate polyaddition products by reacting isocyanates with compounds which are reactive toward isocyanates and have a molecular weight of from 400 to 8000 in the presence of blowing agents, catalysts and, if desired, chain extenders and/or crosslinkers having a molecular weight of &lt;400, auxiliaries and/or additives, use is made of isocyanates having isocyanurate and/or biuret structures, at least one compound which is reactive toward isocyanates, has a molecular weight of from 400 to 8000 and contains at least 50% primary hydroxyl groups, as catalysts at least one tertiary amine and at least one metal salt plus from 0.5 to 5.3% by weight of water, based on the weight of the compounds which are reactive toward isocyanates and have a molecular weight of from 400 to 8000, and the reaction is carried out at &gt;40.degree. C.

Production of polyurethane foams

In a process for producing sheet-like polyurethane moldings by impregnation of porous sheets with a polyurethane system and subsequent reaction of the polyurethane system in a mold, the porous sheet is first fully impregnated with a polyurethane component, then fully impregnated with the other polyurethane component and the molding is then produced in a heated mold by reaction of the polyurethane components.

Production of sheet-like polyurethane moldings

Growing community of inventors

Ludwigshafen, Germany

Rolf Illguth