Hydroxybenzoic acid as pH buffer and corrosion inhibitor for ant

Chemical apparatus and process disinfecting – deodorizing – preser – Process disinfecting – preserving – deodorizing – or sterilizing – Maintaining environment nondestructive to metal

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252 73, 252 75, 252 76, 252 77, 252 781, 252 783, 252309R, 252396, 422 7, 422 17, C09K 1532, C23F 1106, C23F 1110

Patent

active

042410150

ABSTRACT:
A single-phase antifreeze or coolant concentrate is disclosed comprising an alcohol, a silicone-silicate copolymer and an organic basic pH buffer and corrosion inhibitor comprising a hydroxybenzoic acid or mixtures thereof. The concentrates are preferably used as coolants either undiluted or upon dilution with about 30 to about 90 percent by weight of water based upon the total weight of the coolant. The alcohol is preferably ethylene glycol. The coolant compositions are especially effective in inhibiting the corrosion of aluminum internal combustion engine and radiator components.

REFERENCES:
patent: 2094564 (1937-09-01), Schenck et al.
patent: 2411676 (1946-11-01), Burghart
patent: 3198820 (1965-08-01), Pines et al.
patent: 3234144 (1966-02-01), Morehouse

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