Foam boards produced using halogen-free blowing agents

US5576094A · kind A · utility

Assignee

• BASF SE

Inventors

• Julien N. R. Callens · Merksem, BE
• Alfons J. S. van Biesen · Opwijk, BE
• Bernardo Wolff · Mannheim, DE
• Gerhard Alicke · Worms, DE
• Reinhold Weber · Biberach an der Riß, DE
• Franz-Josef Dietzen · Haßloch, DE
• Klaus Hahn · Lampertheim, DE

Key dates

• Filing date: Nov 21, 1995
• Grant date: Nov 19, 1996
• Expiry date: Nov 21, 2015

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/249977
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

Extruded foam boards produced using halogen-free blowing agents from a styrene polymer thermoplastic matrix having a Vicat softening temperature VST B 50 of at most 100.degree. and a melt index MVI 200/5 of at least 5 ml/10 min are at least 20 mm, preferably more than 50 mm and in particular from 80 to 200 mm, thick. Preferred blowing agents for producing the foam boards are carbon dioxide alone, as well as mixtures of carbon dioxide and ethanol and/or dimethyl ether.