C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 226/02 (2006.01) C02F 5/10 (2006.01) C02F 5/12 (2006.01) C08F 226/06 (2006.01) C08G 73/06 (2006.01)
Patent
CA 2202946
The invention is a water-soluble N,N-diallyl-N-alkyl-N-(sulfoalkyl) ammonium betaine containing copolymer, wherein said copolymer is formed from the polymerization of an N,N-diallyl-N-alkyl-N-(sulfoalkyl) ammonium betaine of the formula: Image wherein R is selected from the group consisting of alkyl and aryl groups, and R1is selected from the group consisting of alkyl groups, aryl groups, and alkylaryl groups, and an anionic monomer. The invention is also a method of inhibiting the precipitation and deposition of scale on metal surfaces in contact with industrial cooling waters comprising the addition of an effective, scale-inhibiting amount of a water-soluble N,N-diallyl-N-alkyl-N-(sulfoalkyl) ammonium betaine containing copolymer, wherein said copolymer is formed from the polymerization of a betaine of the formula: Image wherein R is selected from the group consisting of alkyl and aryl groups, and R is selected from the group consisting of alkyl groups, aryl groups, and alkylaryl groups, and an anionic monomer. A preferred polymer is a water-soluble copolymer of N,N-diallyl-N-methyl-N-(2- sulfoethyl) ammonium betaine and acrylic acid.
L'invention est un copolymère à base de N,N-diallyl-N-alkyl-N-(sulfoalkyl)ammonium bétaïne, le copolymère étant obtenu par polymérisation d'une N,N-diallyl-N-alkyl-N-(sulfoalkyl)ammonium bétaïne de formule Image - où R est un alkyle ou un aryle et R1 un alkyle, aryle ou alkylaryle - et d'un monomère anionique. L'invention présente également une méthode pour empêcher la précipitation et le dépôt de tartre sur les surfaces métalliques au contact avec les eaux de refroidissement industrielles; elle consiste à ajouter une quantité efficace anti-tartre d'un copolymère hydrosoluble à base de N,N-diallyl-N-alkyl-N-(sulfoalkyl)ammonium bétaïne, le copolymère étant obtenu par polymérisation d'une bétaïne de formule Image - où R est un alkyle ou un aryle et R1 un alkyle, aryle ou alkylaryle - et d'un monomère anionique. On privilégie comme polymère un copolymère hydrosoluble de N,N-diallyl-N-méthyl-N-(2- sulfoéthyl)ammonium bétaïne et d'acide acrylique.
Davis Ronald V.
Fong Dodd W.
Marth Charles F.
Nalco Chemical Company
Smart & Biggar
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