申请人:Ciba-Geigy Corporation
公开号:US03946011A1
公开(公告)日:1976-03-23
s-Triazine tetracarboxylic acids having the formula ##SPC1## Wherein R is an organic blocking group; A is NH, O, or S; Z is the direct bond, O, S, SO.sub.2, ##EQU1## or CH.sub.2 ; and n is 0 or 1, can be prepared by reacting a dihalo triazine with a dicarboxylic acid substituted with an amino, hydroxy, or mercapto group. By dehydrating the acid a corresponding dianhydride is obtained. These compounds are useful in preparing various polymers, as, for example, polyimides.
具有以下式子的s-三嗪四羧酸:##SPC1##
其中,R是有机阻断基;A是NH,O或S;Z是直接键,O,S,SO.sub.2,##EQU1##或CH.sub.2;n为0或1,可以通过将二卤三嗪与带有氨基,羟基或巯基的二羧酸反应来制备。通过脱水酸可以得到相应的二酐。这些化合物在制备各种聚合物,例如聚酰亚胺等方面是有用的。