Production of foam boards of high compressive strength from styrene polymers

US5453454A · kind A · utility

Assignee

• BASF SE

Inventors

• Gerhard Alicke · Worms, DE
• Manfred Weilbacher · Bischofswerda, DE
• Bernardo Wolff · Mannheim, DE
• Hartmut Heinen · Ludwigshafen, DE
• Franz-Josef Dietzen · Haßloch, DE
• Reinhold Weber · Biberach an der Riß, DE
• Manfred Hahn · Neustadt, DE

Key dates

• Filing date: Nov 22, 1994
• Grant date: Sep 26, 1995
• Expiry date: Nov 22, 2014

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S521/91
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

Process for the production of foam boards having a minimum thickness of 20 mm and a cross-sectional area of at least 50 cm.sup.2 by extruding a mixture of the styrene polymer, from 1 to 10% by weight, based on the styrene polymer, of a blowing agent, wherein the blowing agent contains at least one ether from the group consisting of dimethyl ether, methyl ethyl ether and methyl vinyl ether.