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Stable liquid dicarboxylic acid anhydride compositions

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1. A STABLE COMPOSITION WHICH IS A HOMOGENEOUS LIQUID AT A TEMPERATURE OF ABOUT 20* TO 30*C. AND FREEZE-THAW RESISTANT COMPRISING ESSENTIALLY A MIXTURE OF HEXAHYDROPHTHALIC ANHYDRIDE, TETRAHYDROPTHALIC ANHYDRIDE AND PHTHALIC ANHYDRIDE, WHICH MIXTURE IS NORMALLY HETEROGENEOUS AT LEAST AFTER BEING SUBJECTED TO A FREEZE-THAW CYCLE AND IS CAPABLE OF ACTING AS A CURING AGENT FOR EPOXY RESINS, AND AS A STABLIZING AGENT FOR SAID MIXTURE, A SMALL AMOUNT OF THE REACTION PRODUCT OF ABOUT EQUIMOLECULAR QUANTITITES OF TERTIARY AMINE AND A POLYCARBOXYLIC ACID ANHYDRIDE, THE AMOUNT OF SAID REACTION PRODUCT BEING ABOUT 0.2 TO ABOUT 5.0 PERCENT OF THE WEIGHT OF THE MIXTURE OF ANHYDRIDES.
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