Compositions – Heat-exchange – low-freezing or pour point – or high boiling...
Reexamination Certificate
2010-08-26
2011-11-15
Ogden, Jr., Necholus (Department: 1761)
Compositions
Heat-exchange, low-freezing or pour point, or high boiling...
C252S073000, C252S074000, C252S075000
Reexamination Certificate
active
08057695
ABSTRACT:
A toxicological friendly antifreeze composition having improved thermal stability is provided. In one embodiment, the antifreeze composition comprises from 5 to 80 wt. % of an aqueous freezing point depressant selected from alkali metal salts of acetates, formates, proprionates, adipiates, and succinates, and mixtures thereof; 0.1 to 10 wt. % of at least one of a 2-ethylhexanoic acid, isononanoic acid and 3,5,5-trimethylhexanoic acid; and 0.1 to 10 wt. % of at least one of octanoic acid, nonanoic acid, decanoic acid, undecanoic acid, dodecanoic acid, neodecanoic acid, benzoic acid, 2-hydroxybenzoic acid, p-terbutylbenzoic acid, and mixtures thereof. In one embodiment, the composition is employed as a concentrate in admixture with 10 to 90 wt. % water. The composition may be totally free of glycol, or, in an alternate embodiment, possess a glycol:non-glycol base ratio of 1:2 to 1:20.
REFERENCES:
patent: 5997763 (1999-12-01), Pabon et al.
patent: 6080331 (2000-06-01), Meszaros et al.
patent: 6398984 (2002-06-01), Maes et al.
patent: 6802988 (2004-10-01), Wenderoth et al.
De Kimpe Jurgen P.
Lievens Serge S.
Chevron U.S.A. Inc.
Ogden, Jr. Necholus
Prater Penny L.
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