Linear and cross-linked polybenzimidazoles

Details Linear and cross-linked polybenzimidazoles Linear and cross-linked polybenzimidazoles

1976-08-31

1979-05-15

Lilling, Herbert J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

260 326NT, 260 334P, 427407R, 428290, 528128, 528142, 528145, 528172, 528173, 528174, 528176, 528184, 528211, 528220, 528310, 528327, 528341, 528342, 528353, C08G 7306, C08G 7318

Patent

active

041549198

ABSTRACT:
A polybenzimidazole having a polymer chain with the following repeating unit: ##STR1## R.sub.2 is a divalent carbon ring with the linkage to an adjacent repeating unit through adjacent carbon atoms of the ring. Such polybenzimidazoles are formed by the condensation of (a) a substitute carbon ring compound, having at least one dicarboxylic anhydride or its equivalent substituted at adjacent carbon atoms and (b) an organic tetraamine of the following formula: ##STR2## Polybenzimidazoles of the foregoing type may be formed by the use of a tetracarboxylic dianhydride in the condensation reaction. These cross-linked polymers are characterized by minimal softening or burning at high temperature.

REFERENCES:
patent: RE26065 (1966-07-01), Marvel et al.
patent: 3386969 (1968-06-01), Levine
patent: 3414543 (1968-12-01), Paufler
patent: 3471453 (1969-10-01), Rabilloud et al.
patent: 3546166 (1970-12-01), Rabilloud et al.
patent: 3549594 (1970-12-01), Twilley et al.
patent: 3574170 (1971-04-01), Chevevey
patent: 3597391 (1971-08-01), Hara et al.
patent: 3708439 (1973-01-01), Sayigh et al.
"Polymers from O-Aromatic Tetramines & Aromatic Dianhydride", J. Poly. Sci. PTA, vol. 3, pp. 3549-3571 (1965), Dawans et al.
"Polybenzoylenebenzimidazoles", J. Poly Sci. PTA-1, vol. 4, pp. 59-70 (1966), Colson et al.

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