Preparation of in situ-reticulated flexible polyurethane foams

US6638986B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Peter Falke · Schwarzheide, DE
• Heinz-Dieter Lutter · Diepholz, DE
• Michael Pcolinski · Bloomfield, US

Key dates

• Filing date: Jan 15, 2002
• Grant date: Oct 28, 2003
• Expiry date: Feb 1, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2340/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Reticulated 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 further assistants and additives (f), by a process in which the polyetherol mixture (b) comprisesb1) at least one difunctional or polyfunctional polyetherol having an OH number of from 20 to 150 mg KOH/g, based on propylene oxide and/or butylene oxide and ethylene oxide and having an ethylene oxide content of more than 40% by weight, based on the total amount of alkylene oxide used, (b1.1) and, if required, further difunctional or polyfunctional polyetherols having an OH number of from 20 to 150 mg KOH/g, based on propylene oxide and/or butylene oxide and ethylene oxide and having an ethylene oxide content of not more than 40% by weight, based on the total amount of alkylene oxide used, which have a content of primary OH groups of more than 40%, (b1.2), with total amounts of the component (b1) of at least 70% by weight, based on the total weight of the component (b), (b1.1…