Compositions – Water-softening or purifying or scale-inhibiting agents – Plant or organic material containing
Patent
1973-12-13
1976-04-06
Lovering, Richard D.
Compositions
Water-softening or purifying or scale-inhibiting agents
Plant or organic material containing
21 25R, 21 27R, 210 58, 210 59, 252 76, 252 87, 252389R, C02B 502, C02B 506, C23F 1118, C23F 1114
Patent
active
039487920
ABSTRACT:
A method and composition for reducing the amount of and softening silicate scale formation in automobile and diesel coolant systems where a silicate containing anti-corrosion formula is used which comprises adding to said formula an effective amount of a polymeric dispersant which is a water-soluble carboxylic acid polymer selected from a vinyl addition polymer and a carboxymethyl cellulose. The addition of polymeric dispersants to silicate containing corrosion inhibition formula such as the boron-nitrite type ameliorates or changes the character of the crystalline precipitate to a softer amorphous type and enables the utilization of anti-corrosion formulas at dosages of from about 2,000 up to 20,000 ppm without platingout side effects. Specially preferred dispersants are maleic anhydride copolymers and carboxymethyl cellulose. The advantages of the present invention may be realized in mixed precipitates containing silicate and also anions such as carbonate, phosphate, sulfate, etc., in the presence of alkaline earth cations.
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patent: 3405072 (1968-10-01), Kinnary
patent: 3645903 (1972-02-01), Stram
patent: 3653931 (1972-04-01), Borchert et al.
Cellulose Gum (CMC), Hercules, 1951.
Troscinski Edwin S.
Watsen Robert G.
Gluck Irwin
Lovering Richard D.
Nalco Chemical Company
Premo John G.
Roberts John S.
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