| 摘要 |
The invention comprises compounds of formula <FORM:1032053/C2/1> where R is an unsubstituted aromatic or saturated aliphatic hydrocarbon radical, an organo-silicon radical or a divalent metal atom, each A is an oxygen atom or -NH- radical, R1 is a radical derived from benzene or a saturated aliphatic hydrocarbon radical to two adjacent carbon atoms of which the anhydride radical is attached, and n is an integer from 2 to the maximum number of (ACOR, CO.O.CO) radicals which can be attached to R, and the preparation thereof by reaction between one mole of tricarboxylic acid or anhydride per equivalent of a compound containing a plurality of ester or amido groups. Suitable tricarboxylic acids are trimellitic acid, 1,2,4-naphthalenetricarboxylic acid, 1,4,8-naphthalenetricarboxylic acid, 1,2,4-butanetricarboxylic acid, 1,2,3-benzenetricarboxylic acid, 1,2,3-propanetricarboxylic acid and 2,3,6-naphthalenetricarboxylic acid.ALSO:The invention comprises (1) compounds of formula <FORM:1032053/C3/1> in which R is an organosilicon radical, each A is an oxygen atom or -NH- radical, each R1 is a radical derived from benzene or a saturated aliphatic hydrocarbon radical to two adjacent carbon atoms of which the anhydride radical is attached, and n is an integer from 2 to the maximum number of [A-COR1CO.O.CO] radicals which can be attached to R, and the preparation thereof by reaction between one mole of tricarboxylic acid or anhydride per equivalent of a compound containing a plurality of ester or amido groups, and (2) curing agents for polyesters, epoxy resins and other resins in general containing hydroxy or other reactive groups of the formula given above in which R is an unsubstituted aromatic or saturated aliphatic hydrocarbon radical, an organo-silicon radical or a divalent metal atom and A, R1 and n are as defined above. These compounds are also useful for cross-linking polymerizable materials and preparing polymers such as polyimides. |
