Thio(cyclo)alkanepolycarboxylic acids containing heterocyclic su

Details Thio(cyclo)alkanepolycarboxylic acids containing heterocyclic su Thio(cyclo)alkanepolycarboxylic acids containing heterocyclic su

1990-10-10

1992-10-06

Gerstl, Robert

Compositions

Preservative agents

Anti-corrosion

548170, 548221, 5483071, C09K 1530

Patent

active

051529297

ABSTRACT:
Compounds of the formula I ##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.

REFERENCES:
patent: 4612049 (1986-09-01), Berner et al.
patent: 4612378 (1986-09-01), Bosshard et al.
patent: 4652653 (1987-03-01), Baumann et al.
patent: 4696763 (1987-09-01), Bentley et al.
patent: 4719036 (1988-01-01), Clubley et al.

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