申请人:Ciba-Geigy Corporation
公开号:US05347008A1
公开(公告)日:1994-09-13
Compounds of the formula ##STR1## in which X is --S--, --O-- or --NH--, R is H or a monovalent substituent, n is 0 or 1 and R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are H, alkyl, alkyl which is substituted by OH, halogen, COOH or alkoxy, unsubstituted or substituted aryl or aralkyl, or carboxyl, or R.sup.1 and R.sup.2 or R.sup.1 and R.sup.3 together are alkylene or R.sup.1 and R.sup.2 are a direct bond, at least two of the groups R.sup.1, R.sup.2, R.sup.3 and R.sup.4 being carboxyl or carboxyalkyl groups, and base addition salts thereof are effective corrosion inhibitors. The preparation of these novel polycarboxylic acids can be effected by various processes.
式为##STR1##的化合物,其中X为--S--,--O--或--NH--,R为H或一价取代基,n为0或1,R.sup.1,R.sup.2,R.sup.3和R.sup.4为H,烷基,被OH取代的烷基,卤素,COOH或烷氧基,未取代或取代的芳基或芳基烷基,或羧基,或R.sup.1和R.sup.2或R.sup.1和R.sup.3一起为亚烷基或R.sup.1和R.sup.2为直接键,其中至少两个R.sup.1,R.sup.2,R.sup.3和R.sup.4为羧基或羧基烷基基团,以及其碱盐是有效的防腐剂。这些新型多羧酸的制备可以通过各种方法实现。