High performance mixed bisimide resins and composites based thereon

US4568733A · kind A · utility

Assignee

• The United States of America as represented by the Administrator of the National Aeronautics and Space Administration · US

Inventors

• John A. Parker · Los Altos, US
• Alvin H. Heimbuch · Corona, US
• Ming-Ta Hsu · San Jose, US
• Timothy S. Chen · San Jose, US

Key dates

• Filing date: Apr 4, 1985
• Grant date: Feb 4, 1986
• Expiry date: Apr 4, 2005

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31721
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to mixed bismaleimide/biscitraconimide resins. Mixtures of the two resins produces materials which have better handling, processing or mechanical and thermal properties, particularly in graphite composites, than materials made with the individual resins. The mechanical strength of cured graphite composites prepared from a 1:1 copolymer of such bisimide resins is excellent at both ambient and elevated temperatures. The copolymer mixture provides improved composites which are lighter than metals and replace metals in many aerospace applications.