Use of 1,1,1,4,4,4-hexaefluorobutane as a blowing and insulating gas for the production of foam plastics

US4931482A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Wilhelm Lamberts · Cologne, DE
• Klaus-Dieter Sommerfeld · Overath, DE
• Dietmar Bielefeldt · Ratingen, DE
• Albrecht Marhold · Leverkusen, DE
• Michael Negele · Cologne, DE

Key dates

• Filing date: May 22, 1989
• Grant date: Jun 5, 1990
• Expiry date: May 22, 2009

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S521/908
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

This invention relates to an improved method of preparing closed cell foams using 1,1,1,4,4,4-hexafluorobutane as a blowing agent and insulating gas in the production of such foams, including isocyanate-based foams such as polyurethane foams and polyisocyanurate foams.