Method for the manufacture of flexible polyurethane foam

US5194453A · kind A · utility

Assignee

• RECTICEL · BE

Inventors

• Lucien Jourquin · Wetteren, BE
• Eddie DuPrez · Zottegem, BE
• Rudi Mortelmans · Steendorp, BE

Key dates

• Filing date: Sep 9, 1991
• Grant date: Mar 16, 1993
• Expiry date: Sep 9, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2375/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A method for the manufacture of flexible polyurethane foam of a density between 35 and 70 kg/m.sup.3 and having improved comfort properties, wherein a reaction mixture is composed containing at least a polyether polyol of equivalent weight between 1400 and 2800 and having a primary hydroxyl group content of more than 50%, an organic polyisocyanate, a catalyst and 0.5 to 1% by weight water with respect to the total foam weight and wherein, in order to allow the reaction mixture to expand up to said density by means of this limited amount of water and by means of up to 1.5 mole of a physical blowing agent per mole polyol, the reaction mixture is frothed mechanically and/or the reaction mixture is allowed to expand under a reduced pressure.