Preparation of flexible, soft polyurethane foams having viscoelastic, structure-borne soundproofing properties, and polyoxyalkylene-polyol mixtures which can be used for this purpose

US5420170A · kind A · utility

Assignee

• BASF SE

Inventors

• Heinz-Dieter Lutter · Diepholz, DE
• Reinhard Leppkes · Frankenthal (Pfalz), DE
• Peter Horn · Heidelberg, DE
• Walter Decker · Ludwigshafen, DE
• Volker Haase · Adelzhausen, DE
• Werner Hinz · Bischofswerda, DE

Key dates

• Filing date: Nov 28, 1990
• Grant date: May 30, 1995
• 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

The present invention relates to a process for the preparation of flexible, soft polyurethane foams having viscoelastic, structure-borne soundproofing properties in a temperature range of from -20.degree. C. to +80.degree. C. by reacting PA1 a) a polyoxyalkylene-polyol mixture containing PA2 ai) block polyoxypropylene-polyoxyethylene-polyol mixture having a hydroxyl number of from 14 to 65 and containing from 2 to 9% by weight of terminal ethylene oxide units, based on the weight of the polyoxypropylene units, prepared by anionic polymerization, at elevated temperatures, of 1,2-propyleneoxide onto an initiator molecule mixture having a mean functionality of from 2.3 to 2.8, comprising water and glycerol and/or trimethylolpropane, and polymerization of acylene oxide onto the resultant polyoxypropylene adduct, and PA2 aii) one or more difunctional and/or trifunctional polyoxypropylene-polyoxyethylene-polyol containing from 60 to 85% by weight of oxyethylene units, based on the total weight of polymerized alkylene oxide units, and having a hydroxyl number of from 20 to 80, and PA1 b) if desired low-molecular-weight chain extenders with PA1 c) organic and/or modified organic polyisocya…