Process for producing viscoelastic polyurethane foams

US8362098B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Stephan Goettke · Bakum, DE
• Heinz-Dieter Lutter · Diepholz, DE
• Berend Eling · Ludwigshafen, DE
• Steven E. Wujcik · Ann Arbor, US
• Jens Mueller · Löhne, DE

Key dates

• Filing date: Nov 30, 2006
• Grant date: Jan 29, 2013
• Expiry date: Aug 22, 2028

Classification

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

Abstract

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, c) blowing agents, wherein b) comprise b1) from 70 to 10 parts by weight of at least one polyether alcohol having polyoxypropylene units, a nominal functionality of from 3 to 6 and a hydroxyl number of 100 to 300 mg KOH/g, b2) from 10 to 70 parts by weight of at least one polyetherol having polyoxypropylene units, a nominal functionality of 2 and a hydroxyl number of 50 to 350 mg KOH/g, b3) from 10 to 30 parts by weight of at least one polyether alcohol having ethylene oxide units, a nominal functionality of from 2 to 3 and a hydroxyl number of 50 to 550 mg KOH/g, b4) from 0 to 20 parts by weight of at least one graft polyetherol having a nominal functionality of from 2 to 3 and a hydroxyl number of 20 to 40 mg KOH/g.