Detergent compositions comprising an alkali metal carbonate...

C - Chemistry – Metallurgy – 11 – D

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C11D 3/10 (2006.01) C11D 3/00 (2006.01) C11D 3/20 (2006.01) C11D 17/06 (2006.01)

Patent

CA 2463234

A particulate laundry detergent composition which comprises a detergent base powder comprising surfactant and builder and, as separate particulate components: (a) an alkali metal carbonate salt selected from carbonate, bicarbonate, sesquicarbonate and combinations thereof; and (b) a water-soluble organic acid which, when reacted with (a) in the presence of water, generates carbon dioxide gas; wherein the alkali metal carbonate salt, when taken separately, has a 90% dissolution time of less than 15 seconds, and the water- soluble organic acid has a d50 particle size which is in the range of from 150 to 1500 microns. The alkali metal carbonate salt preferably has an average bulk density of at most 1000 g/l. The alkali metal carbonate salt preferably has a d50 particle size of at most 250 microns. The alkali metal carbonate salt is preferably sodium and/or potassium carbonate.

L'invention concerne une composition détergente particulaire pour la lessive. Cette composition comprend une poudre à base de détergent renfermant un tensioactif et un adjuvant et comme composants particulaires distincts: (a) un sel de carbonate d'un métal alcalin sélectionné parmi le carbonate, le bicarbonate, le sesquicarbonate et des combinaisons de ceux-ci; et (b) un acide organique hydrosoluble, qui, lorsqu'il est mis à réagir avec (a) en présence d'eau, génère du gaz de dioxyde de carbone; le sel de carbonate d'un métal alcalin, pris séparément, présentant un temps de dissolution à 90 % inférieur à 15 secondes et l'acide organique hydrosoluble présentant une granulométrie d50 comprise dans la gamme allant de 150 à 1500 microns. Le sel de carbonate d'un métal alcalin présente, de préférence, une masse volumique apparente moyenne d'au plus 1000 g/l, une granulométrie d50 d'au plus 250 microns et est, de préférence, du carbonate de sodium et/ou de potassium.

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