C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 5/14 (2006.01)
Patent
CA 2611154
The invention relates to the use of copolymers containing alkylene oxides as an additive to aqueous systems containing phosphate and/or phosphonate in industrial technical installations. These copolymers, while being incorporated by polymerization in a statistical or block-by-block manner, contain: (a) 50 to 93 mol- % of acrylic acid and/or of a water-soluble salt of the acrylic acid; (b) 5 to 30 mol- % of methacrylic acid and/or of a water-soluble salt of methacrylic acid, and; (c) 2 to 20 mol- % of at least one nonionic monomer of formula (I) in which the variables have the following meaning: R1 represents hydrogen or methyl; R2 represents a chemical bond or an unbranched or branched C1-C6 alkylene; R3 represents the same or different unbranched or branched C2- C4 alkylene radicals; R4 represents unbranched or branched C1-C6 alkyl, and; n represents 3 to 50.
L'invention concerne l'utilisation de copolymères contenant des unités d'oxyde d'alkylène, ces copolymères contenant de manière polymérisée en blocs ou statiques (a) 50 à 93 % en moles d'acide acrylique et/ou d'un sel hydrosoluble d'acide acrylique, (b) 5 à 30 % en moles d'acide méthacrylique et/ou d'un sel hydrosoluble d'acide méthacrylique, et (c) 2 à 20 % en moles d'au moins un monomère non ionique de formule (I), dans laquelle les variables ont la signification suivante : R1 signifie hydrogène ou méthyle, R2 est une liaison chimique ou alkylène C1-C6 ramifié ou non, R3 désigne des groupes alkylène C2-C4 ramifiés ou non, identiques ou différents, R4 représente alkyle C1-C6 ramifié ou non, n est un chiffre de 3 à 50. Ces copolymères servent d'additifs à des systèmes aqueux contenant du phosphate et/ou du phosphonate dans des installations techniques industrielles.
Buechner Karl-Heinz
Guzmann Marcus
Nied Stephan
Basf Aktiengesellschaft
Borden Ladner Gervais Llp
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