Use of copolymers, containing alkylene oxide units, as...

Details Use of copolymers, containing alkylene oxide units, as... Use of copolymers, containing alkylene oxide units, as...

C - Chemistry, Metallurgy

11

D

C11D 3/37 (2006.01) C11D 17/00 (2006.01)

Patent

CA 2543543

The invention relates to the use of copolymers which contain alkylene oxide units, as deposit inhibitor additives in the rinsing process of a dishwasher, said copolymers containing the following constituents, incorporated by block or statistical polymerisation: (a) 50 to 93 mol% of acrylic acid and/or a water-soluble salt thereof, (b) 5 to 30 mol% of methacrylic acid and/or a water-soluble salt thereof and (c) 2 to 20 mol% of at least one non-ionic monomer of formula (I), wherein the variables have the following meaning: R1 = hydrogen or methyl; R2 represents a chemical bond, or branched or unbranched C1-C6 alkylene; R3 represents identical or different, branched or unbranched C2-C4 alkylene radicals; R4 represents branched or unbranched C1-C6 alkyl and n = 3 to 50.

L'invention concerne l'utilisation de copolymères contenant des unités oxyde d'alkylène comme additifs inhibiteurs de dépôt dans le processus de rinçage d'un lave-vaisselle, lesquels copolymères contiennent (a) 50 à 93 % en mole d'acide acrylique et/ou d'un sel soluble dans l'eau de l'acide acrylique, (b) 5 à 30 % en mole d'acide méthacrylique et/ou d'un sel soluble dans l'eau de l'acide méthacrylique et (c) 2 à 20 % en mole d'au moins un monomère non ionique de formule (I), dans laquelle les variables ont la signification suivante : R?1¿ = hydrogène ou méthyle ; R?2¿ désigne une liaison chimique ou alkylène en C¿1?-C¿6? ramifié ou non ; R?3¿ désigne des restes alkylène en C¿2?-C¿4? ramifiés ou non, identiques ou différents ; R?4¿ représente alkyle en C¿1?-C¿6? ramifié ou non et n désigne un nombre de 3 à 50, ces composés étant incorporés par polymérisation séquencée ou statistique.

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