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US 5,062,987 AGranted
Cooling system cleaning solutions
AssigneeBASF SE
InventorsDavid E. Turcotte, Daniel E. Coker
Life of this patent
Estimating the term…
Abstract
Cooling system cleaning solutions containing an EDTA salt, sorbitol, and a soluble nitrate salt are effective in removing scale, corrosion, and solder bloom from cooling systems without blackening aluminum, and can be formulated into concentrates having enhanced storage stability.
Claims17
An alkaline, storage stable cooling system cleaning concentrate composition having a pH of from 9 to 11, comprising in weight percent based on the total weight of the concentrate,
- a. from 1 to about 30 percent of an EDTA salt selected from the group consisting of the alkali metal and ammonium salts of EDTA;
- b. from 1 to about 50 percent of sorbitol;
- c. from 0.5 to about 8 percent of a soluble nitrate salt;
- d. from 1 to about 15 percent of a silicon containing aluminum corrosion inhibitor selected from the group consisting of alkali metal silicates, siliconates and silicone-silicate mixtures;
- e. an amount of a glycol which is effective to render the composition storage stable;
- and
- f. from 0.5 to about 8 percent of a mineral acid.
4 more elements
An alkaline, storage stable cooling system cleaning composition comprising an EDTA salt in an amount of about 5 percent;
- sorbitol in an amount of about 20 percent;
- sodium nitrate present in an amount of about 3 percent;
- a stabilized silicone/silicate corrosion inhibitor present in an amount of about 10 percent;
- and ethylene glycol present in an amount of about 32 percent;
- the balance of the composition comprising essentially water.
2 more elements
Dependencies are inferred from the claim text.