Graft copolymers based on mono-, oligo- and polysaccharides,...

C - Chemistry – Metallurgy – 08 – F

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C08F 251/00 (2006.01) C11D 3/37 (2006.01)

Patent

CA 2221609

Water-soluble graft copolymers of monosaccharides, oligosaccharides, polysaccharides and their derivatives are obtained by radically initiated copolymerisation of (A) monomer mixtures of (a) more than 40-100 % by weight of at least one .alpha.-.beta.-unsaturated aldehyde having general formula (I), in which R1 stands for hydrogen or linear or branched C1-C4 alkyl, and R2 stands for hydrogen or methyl, (b) 0-60 % by weight of monoethylenically unsaturated monomers different from (a) but copolymerisable with (a), and (c) 0-5 % by weight of at least two ethylenically unsaturated monomers having no conjugated double bonds in their molecule, in the presence of (B) monosaccharides, oligosaccharides, polysaccharides, polysaccharides decomposed by oxidation, hydrolysis or enzymes, chemically modified mono-, oligo- or polysaccharides or mixtures of said compounds; and (C) one or several oxidants. The weight ratio between (A) and (B) extends from (95: 20) to (5: 80) and the weight ratio between (C) and (A) + (B) extends from (5: 100) to (50: 50). Used as builders or co-builders, these graft copolymers have good scale-inhibiting properties and are extremely biodegradable.

L'invention concerne des copolymères greffés solubles dans l'eau constitués de monosaccharides, d'oligosaccharides, de polysaccharides et leurs dérivés, obtenus par copolymérisation radicalaire de mélanges de monomères (A) constitués de (a) plus de 40 à 100 % en poids d'au moins un aldéhyde .alpha.-.beta.-insaturé de formule générale (I), dans laquelle R?1¿ désigne hydrogène ou alkyle C¿1?-C¿4? linéaire ou ramifié et R?2¿ désigne hydrogène ou méthyle; (b) 0 à 60 % en poids de divers monomères monoéthyléniquement insaturés, différents de (a) mais copolymérisables avec (a); et (c) 0 à 5 % en poids d'au moins deux monomères éthyléniquement insaturés ne contenant pas des liaisons doubles conjuguées dans leur molécule, en présence de (B) monosaccharides, oligosaccharides, polysaccharides, polysaccharides décomposés par oxydation, hydrolyse ou des enzymes, monosaccharides, oligosaccharides ou polysaccharides chimiquement modifiés ou des mélanges de ces composés; et de (C) un ou plusieurs agents oxydants. Le rapport en poids entre (A) et (B) est compris entre (95: 20) et (5: 80) et le rapport en poids entre (C) d'une part et (A) + (B) d'autre part est compris entre (5: 100) et (50: 50). Utilisés comme adjuvants ou co-adjuvants, ces copolymères greffés ont un bon effet inhibiteur des incrustations et sont extrêmement biodégradables.

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