Preparation of flexible polyurethane foams having low compressive strength and block polyoxypropylenepolyoxyethylenepolyol mixtures which can be used for this purpose

US5059633A · kind A · utility

Assignee

• BASF SE

Inventors

• Heinz-Dieter Lutter · Diepholz, DE
• Werner Hinz · Bischofswerda, DE
• Walter Decker · Ludwigshafen, DE
• Reinhard Leppkes · Frankenthal (Pfalz), DE
• Erhard Reich · Damme, DE
• Reinhard Peters · Munich, DE
• Volker Haase · Adelzhausen, DE
• Michael Lugmayr · Puchheim, DE

Key dates

• Filing date: Nov 28, 1990
• Grant date: Oct 22, 1991
• Expiry date: Nov 28, 2010

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S521/914
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Flexible polyurethane foams having low compressive strength and relatively good tensile strength are prepared by reacting PA1 a) a block polyoxypropylenepolyoxyethylenepolyol mixture which has a hydroxyl number of from 14 to 65, contains from 2 to 9% by weight, based on the weight of the polyoxypropylene units, of ethylene oxide units bonded in the terminal position and is prepared by anionic polymerization of the alkylene oxides with an initiator mixture having an average functionality of from 2.3 to 2.8 and consisting of water and glycerol and/or trimethylolpropane, or a mixture of these block polyoxypropylenepolyoxyethylenepolyol mixtures with bi- and/or trifunctional polyoxypropylenepolyoxyethylenepolyols having a hydroxyl number of from 20 to 70, and PA1 b) if required, low molecular weight chain extenders with PA1 c) organic and/or modified organic polyisocyanates in the presence of PA1 d) catalysts, PA1 e) blowing agents, preferably water, and if required, PA1 f) assistants and/or additives.