Process for the preparation of elastic polyurethane flexible foams usable in cold-mold techniques to produce molded articles

US4668708A · kind A · utility

Assignee

• BASF SE

Inventors

• Gerhard Mueller · Freilassing, DE
• Matthias Marx · Fürstenfeldbruck, DE
• Wolfgang Jarre · Ludwigshafen, DE
• Edwin Baumann · Schifferstadt, DE
• Ingolf Buethe · Haßloch, DE

Key dates

• Filing date: May 30, 1986
• Grant date: May 26, 1987
• Expiry date: May 30, 2006

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S521/914
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention is a process for the preparation of elastic polyurethane flexible foams having densities from approximately 25 to 60 kg/m.sup.3, and producing molded articles in closed molds at temperatures from 25.degree. to 80.degree. C., comprising reacting PA0 (A) an organic polyisocyanate prepolymer having an isocyanate content from 6 to 20 percent by weight prepared by reacting a toluene diisocyanate and/or a diphenylmethane diisocyanate with a di- to tetrafunctional polyether polyol having a hydroxyl number from 20 to 50 and oxyethylene terminal group content of at least 10 to 30 percent by weight PA0 (B) a mixture of compounds containing reactive hydrogen atoms, comprising a mixture of PA1 (a) from 55 to 89.5 parts by weight of at least one di- to tetrafunctional polyether polyol having a hydroxyl number of from 20 to 80 and less than 10 percent by weight terminal oxyethylene groups, PA1 (b) from 0.5 to 20 parts by weight of at least one alkanolamine, and PA1 (c) from 10 to 25 parts by weight water, in the presence of PA0 (C) a blowing agent, PA0 (D) a catalyst, and optionally PA0 (E) auxiliaries and/or additives.