Molybdate-free antifreeze concentrate and coolant...

Details Molybdate-free antifreeze concentrate and coolant... Molybdate-free antifreeze concentrate and coolant...

2010-07-08

2011-11-22

Ogden, Jr., Necholus (Department: 1761)

Compositions

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

Organic components

C252S074000, C252S075000, C252S076000, C252S077000

Reexamination Certificate

active

08062546

ABSTRACT:
A molybdate-free antifreeze composition having improved thermal stability is provided. In one embodiment, the antifreeze concentrate composition comprises from 50 to 99 wt. % of a glycol-based freezing point depressant selected from the group of: alkylene glycols, glycol monoethers, glycerins, and mixtures thereof; 0.01 to 10 wt. % of at least one of a 2-ethylhexanoic acid, isononanoic acid and 3,5,5-trimethylhexanoic acid; and 0.01 to 5 wt. % of at least one of heptanoic acid, octanoic acid, nonanoic acid, decanoic acid, undecanoic acid, dodecanoic acid, neodecanoic 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.

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.

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