Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1993-12-08
1994-10-18
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528 15, 528 19, 528 21, 528 33, 528 37, 528315, 528319, C08G 7310
Patent
active
053570294
ABSTRACT:
Macrocyclic polyimide oligomers are prepared by the reaction of at least one diamine with at least one tetracarboxylic acid or dianhydride thereof in equimolar amounts, under conditions of high dilution of said reagents. The macrocyclic oligomers are capable of conversion into linear polyimides by heating with a primary amine in the presence of a macrocyclic polyimide polymerization catalyst, typically an alkaline earth or transition metal or salt thereof.
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Takekoshi Tohru
Terry Jane M.
Foelak Morton
General Electric Co.
Hampton-Hightower P.
Pittman William H.
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