Polymeric foams from cross-linkable poly-N-ary lenebenzimidazoles

US4092274A · kind A · utility

Inventors

• James C. Administrator of the National Aeronautics and Space Fletcher
• Edward S. Harrison · Idyllwild, US
• Chadwick B. Delano · Sunnyvale, US
• Salvatore R. Riccitiello · San Jose, US

Key dates

• Filing date: Jul 26, 1976
• Grant date: May 30, 1978
• Expiry date: Jul 26, 1996

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2379/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Foamed cross-linked poly-N-arylenebinzimidazoles are prepared by mixing an organic tetraamine and an ortho substituted aromatic dicarboxylic acid anhydride in the presence of a blowing agent and then heating the prepolymer to a temperature sufficient to complete polymerization and foaming of the reactants. In another embodiment of the process, the reactants are heated to form a prepolymer. The prepolymer is then cured at higher temperatures to complete foaming and polymerization.