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US 4,226,755 AGranted
Trimellitic acid ester and its use in a protective lacquer based on epoxide resin
AssigneeCiba-Geigy Corporation
InventorEduard Knecht
Life of this patent
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Abstract
The invention relates to a trimellitic anhydride ester mixture which is suitable for lacquers and which is obtained by heating trimellitic anhydride together with a diol, in the molar ratio of 1:1 to 2:1, for at least 4 hours at 190.degree. to 250.degree. C., at an external pressure of 5 or 30 Torr for at least part of this time, and in the absence of a catalyst. The mixture is used as curing agent for the epoxide resin in a laquer containing epoxide resin and optionally pigments. The lacquer is used for the inside coating of tins (cans) for foodstuffs.
Claims8
A lacquer which contains:
- (1) an epoxide resin;
- (2) a trimellitic anhydride ester mixture which is obtained by heating trimellitic anhydride with at least one diol, in a molar ratio of 2:1.25, for at least 4 hours at 190.degree.-250.degree. C., at an external pressure of 5-30 torr for at least part of this time and in the absence of catalyst;
- and (3) a solvent.
Dependencies are inferred from the claim text.