Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1988-04-13
1990-06-19
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528125, 528126, 528128, 528172, 528185, 528352, C08G 6926
Patent
active
049354906
ABSTRACT:
Aromatic polyimides of the formula: ##STR1## where --Ar-- is ##STR2## --Ar'-- is ##STR3## --Ar"-- is ##STR4## where --Z, and --Z.sub.1, independently are --Cl, --Br or --I; where --X, --X.sub.1, --X.sub.2 and --X.sub.3 independently are --CH.sub.3 or --C.sub.2 H.sub.5 ; and --Y,--Y.sub.1,--Y.sub.2 and --Y.sub.3 are primary or secondary alkyl groups having 3 to 12 carbon atoms, provided that when m is greater than 0, r is 0 and that when L is greater than 0, r and s are 0, are disclosed. These polyimides are very soluble, even in weak solvents such as toluene.
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E. I. DuPont de Nemours and Company
Foelak Morton
Moore M. L.
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