Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1976-07-26
1978-05-30
Foelak, Morton
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 47CP, 260 63N, 260 7841, C08V 902
Patent
active
040922740
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.
REFERENCES:
patent: RE26065 (1966-07-01), Marvel et al.
patent: 3541199 (1970-11-01), Bohrer et al.
patent: 3549603 (1970-12-01), Chenevey et al.
patent: 3551389 (1970-12-01), Prince, Jr.
patent: 3708439 (1973-01-01), Sayigh et al.
Delano Chadwick B.
Fletcher James C. Administrator of the National Aeronautics & Space
Harrison Edward S.
Riccitiello Salvatore R.
Brekke Darrell G.
Foelak Morton
Manning John R.
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