Mixtures of polyamino acids and citrate

C - Chemistry – Metallurgy – 11 – D

Patent

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C11D 7/22 (2006.01) C02F 5/10 (2006.01) C02F 5/12 (2006.01) C08G 69/10 (2006.01) C08G 73/10 (2006.01) C11D 3/20 (2006.01) C11D 3/37 (2006.01) C11D 7/26 (2006.01) C11D 7/32 (2006.01)

Patent

CA 2171328

Polyamino acids or their salts mixed with citric acid or its salts, in a ratio of 75:25 to 0.1:99.9, polyamino acid or its salt to citric acid or its salts, and especially in a ratio of 1:1 to 1:99 polyamino acids or their salts to citric acid or its salts, provide a much higher rate of chelation of calcium ion than expected on the basis of the addition of the polyamino acid to citric acid. Such mixtures may be used in high volume water applications such as boiler, cooling, oil well, agricultural sprays and irragation water. They are also useful in preventing scale formation on fabrics when formulated with laundry detergents and in preventing scale formation on glassware when formulated in dishwashing detergents.

Lea acides polyaminés ou leurs sels mélangés avec de l'acide citrique ou ses sels, à raison de 75:25 à 0,1:99,9, et plus particulièrement de 1:1 à 1:99, produisent un taux de chélation de l'ion de calcium bien plus élevé que celui normalement obtenu par l'addition d'acide polyaminé à l'acide citrique. Ces mélanges peuvent être utilisés dans des grands volumes d'eau tels que dans l'eau des chaudières, de refroidissement, des puits de pétrole, de pulvérisation agricole et d'irrigation. Ils peuvent également être utilisés pour empêcher les dépôts de calcaire sur les tissus lorsqu'ils sont incorporés dans des détergents lessiviels et sur la verrerie lorsqu'ils sont utilisés avec des détergents pour vaisselle.

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