Polyurethane foam and method for producing same

US9834655B2 · kind B2 · utility

Assignee

• CONVESTRO DEUTSCHLAND AG · DE

Inventors

• Dirk Steinmeister · Leverkusen, DE
• Stephan Moers · Hückeswagen, DE
• Stefan Lindner · Friesenheim, DE
• Wolfgang Friederichs
• Juergen Straeter · Dormagen, DE

Key dates

• Filing date: Apr 24, 2012
• Grant date: Dec 5, 2017
• Expiry date: Sep 3, 2033

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2375/04
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a method for producing a polyurethane foam, wherein a mixture having the following is discharged from a mixing head through a discharge line: A) a component reactive toward isocyanates; B) a surfactant component; C) a blowing agent component selected from the group comprising linear, branched, or cyclic C1 to C6 hydrocarbons, linear, branched, or cyclic C1 to C6 fluorocarbons, N2, O2, argon, and/or CO2, wherein the blowing agent C) is present in the supercritical or near-critical state; and D) a polyisocyanate component. The component A) has a hydroxyl value=100 mg KOH/g and =1000 mg KOH/g. The blowing agent component C) is present at least partially in the form of an emulsion, and means provided with an opening or several openings are arranged in the discharge line in order to increase the flow resistance during the discharge of the mixture comprising A), B), C), and D), wherein the cross-sectional area of the opening or the sum of the cross-sectional areas of all openings is =0.1% and =99.9% of the inner cross-sectional area of the discharge line.