Polyurethane foam materials having reduced cold-flow effect and method for producing same

US11919994B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Matthaeus Gossner · Cologne, DE
• Peter Haas · Brisbane, AU
• Michael Schedler · Leverkusen, DE
• Sven Meyer-Ahrens · Leverkusen, DE
• Lutz Brassat · Leverkusen, DE

Key dates

• Filing date: May 7, 2020
• Grant date: Mar 5, 2024
• Expiry date: Oct 6, 2040

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2375/08
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a method for producing soft polyurethane foam obtained by reacting a composition containing a component A1 containing at least one filled polyol, a component A2 containing compounds reactive with isocyanates and having a hydroxyl value of ≥20 to <100 mg KOH/g, the component A2 not containing any filled polyol, a component A3 containing water and/or at least one physical blowing agent, a component A4 containing auxiliary agents and additives, and a component B containing di- and/or polyisocyanates, characterized in that the reaction occurs in the presence of 0.5 to 3 parts by weight of an organic urea derivative as component C, which is obtained by reacting urea with a difunctional amine having a number-average molecular weight of 200 to 1000 g/mol. The invention also relates to a soft polyurethane foam obtainable by the method.