Coolant comprising azole derivatives for cooling systems in...

Details Coolant comprising azole derivatives for cooling systems in... Coolant comprising azole derivatives for cooling systems in...

2005-10-20

2008-09-02

Ogden, Necholus (Department: 1796)

Compositions

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

C252S073000, C252S075000, C429S006000, C429S006000, C429S120000

Reexamination Certificate

active

07419617

ABSTRACT:
Methods for cooling a fuel cell include providing in a fuel cell coolant system an aqueous fuel cell coolant composition having an initial electrical conductivity of at most 50 μS/cm. The fuel cell coolant compositions include an alkylene glycol and water solution, and an additive consisting of one or more five membered heterocyclic compounds (azole derivatives) having 2 or 3 heteroatoms selected from the group consisting of nitrogen and sulfur, which contain no or at most one sulfur atom and which may carry a fused aromatic or saturated six-membered ring, and an orthosilicate in an amount to provide a silicon content of from 2 to 2000 ppm by weight.

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