Use of methylene azelaic acid as a corrosion inhibitor

Details Use of methylene azelaic acid as a corrosion inhibitor Use of methylene azelaic acid as a corrosion inhibitor

1985-02-01

1986-03-25

Lieberman, Paul

Compositions

Heat-exchange, low-freezing or pour point, or high boiling...

Organic components

252 73, 252 79, 252 82, 25217418, 252180, 252396, 562595, C09K 500

Patent

active

045782059

ABSTRACT:
The use of methylene azelaic acid having the formula CH.sub.2 .dbd.C--[(CH.sub.2).sub.3 --COOH].sub.2 or an alkali metal salt thereof in glycol and water based automotive antifreeze formulations is described. Unlike natural dicarboxylic acids such as sebacic acid, methylene azelaic acid does not form a precipitate and drop out of solution, rendering the antifreeze unprotected against corrosion. The methylene azelaic acid component should be present in an amount of from 1.5 to 4.5 wt. % based on the glycol component.

REFERENCES:
patent: 2641607 (1953-06-01), Albisetti et al.
patent: 2722516 (1955-11-01), Merker
patent: 2726215 (1955-12-01), Jones
patent: 2767144 (1956-10-01), Gottshall
patent: 3678102 (1972-07-01), Isard et al.

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