Preparation of flexible polyurethane foams

US6583192B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Peter Falke · Schwarzheide, DE
• Heinz Schroder · Düren, DE
• Lothar Baum · Schwarzheide, DE

Key dates

• Filing date: Jan 15, 2002
• Grant date: Jun 24, 2003
• Expiry date: Jan 15, 2022

Classification

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

Abstract

Flexible polyurethane foams are prepared by reacting organic and/or modified organic polyisocyanates (a) with a polyetherol mixture (b) and, if required, further compounds (c) having hydrogen atoms reactive toward isocyanates, in the presence of water and/or other blowing agents (d), catalysts (e) and, if required, further assistants and additives (f), by a process in which the polyetherol mixture (b) consists ofb1) at least one polyetherol which is at least difunctional, has an OH number of from 20 to 100 mg KOH/g and is based on propylene oxide and/or butylene oxide and ethylene oxide, having an ethylene oxide content of more than 40% by weight, based on the total amount of alkylene oxide used, and, if required, further polyetherols which are at least difunctional, are based on propylene oxide and/or butylene oxide and ethylene oxide and have an OH number of from 20 to 160 mg KOH/g andb2) at least one difunctional to hexafunctional polyetherol based on propylene oxide and/or butylene oxide and having an OH number of less than 800 mg KOH/gand the foams are prepared with indices of less than 110, the amount by weight of (b1) being greater than that of (b2). The flexible polyurethan…