Process for producing liquid dibasic acid anhydrides
AssigneeNippon Zeon Co., Ltd.
InventorsMotoyuki Yamato, Tadao Natsuume
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Abstract
A dibasic acid anhydride which is liquid at 0.degree. C., or even at -20.degree. C., is produced by heat-treating in the presence of a stereoisomerization catalyst a structural isomeric mixture obtained by shifting the double bond of methyl-tetrahydrophthalic anhydride. The liquid dibasic acid anhydride is useful as a curing agent for epoxy resins.
Claims9
A process for producing a dibasic acid anhydride which is liquid at 0.degree. C., comprising heat-treating in the presence of a stereoisomerization catalyst a structural isomeric mixture of methyltetrahydrophthalic anhydride resulting from the shifting of its double bond.
Dependencies are inferred from the claim text.