Hard foam cores for laminates

US4996109A · kind A · utility

Assignee

• Rohm Co., Ltd. · JP

Inventors

• Manfred Krieg · Darmstadt, DE
• Norbert Rau · Ober-Ramstadt, DE
• Werner Ude · Darmstadt, DE

Key dates

• Filing date: Jul 31, 1989
• Grant date: Feb 26, 1991
• Expiry date: Jul 31, 2009

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31721
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Rigid foamed polymethacrylimide synthetic resin containing from 0.1 to 10 percent by weight of electrically conductive particles such as conductive carbon black exhibit improved properties when used in rapidly flowing streams of gases, are particularly suitable for use as a core material in laminates for aircraft construction, and are prepared by heating a copolymer of methacrylic acid and methyacrylonitrile containing a blowing agent and conductive particles.