Method for producing viscoelastic polyurethane flexible foams

US8426482B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Ansgar Frericks
• Heinz-Dieter Lutter · Diepholz, DE
• Edmund Stadler · Hollfeld, DE
• Heinz-Juergen Schroeder · Schwarzheide, DE
• Kirsten Simon · Asendorf, DE
• Andre Meyer · Bohmte, DE
• Franck Pomeris · Lagny-sur-Marne, FR

Key dates

• Filing date: Oct 19, 2009
• Grant date: Apr 23, 2013
• Expiry date: Oct 21, 2029

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2350/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Invention relates to a process for producing viscoelastic flexible polyurethane foams by reacting a) polyisocyanates with b) compounds having at least two hydrogen atoms which are reactive toward isocyanate groups, wherein as b) a mixture of bi) from 25 to 70% by weight of a hydroxyl-comprising natural oil or fat or a reaction product of a hydroxyl-comprising natural oil or fat with alkylene oxides, bii) from 3 to 30% by weight of at least one polyether having a hydroxyl number of from 100 to 800 mg KOH/g and a functionality of 3-5 selected from the group consisting of polyether prepared by addition of alkylene oxides onto an amine, biii) 20-50% by weight of at least one polyether alcohol having a hydroxyl number of from 10 to 80 mg KOH/g and a functionality of 2-5, where the proportion of ethylene oxide is 5-25% by weight, based on the weight of the polyether alcohol, and at least part of the ethylene oxide is added on at the end of the polyether chain, biv) >0-8% by weight of at least one polyether alcohol having a functionality of 2-4, a hydroxyl number of 15-60 mg KOH/g and a content of ethylene oxide of >50% by weight of the polyether alcohol is used.