Graft copolymer, process for the preparation thereof and its...

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 2/44 (2006.01) C08F 292/00 (2006.01) C08J 5/00 (2006.01) C09K 8/00 (2006.01) C09K 8/487 (2006.01)

Patent

CA 2723941

A graft copolymer based on a component a) consisting of silica which has been reacted with an unsaturated silane, and a polymer component b) containing sulphonic acid is proposed. The silica used is preferably a nanosilica and the unsaturated silane is an ethylenically unsaturated alkoxysilane. The component b) is represented by a copolymer based on AMPS and a further ethylenically unsaturated monomer. The polymer according to the invention, which as a rule is a nanocomposite, is outstandingly suitable as an additive in construction chemistry applications and in the development, exploitation and completion of underground mineral oil and natural gas deposits, its effect as a water retention agent being particularly advantageous at high salinities and increased temperatures.

L'invention concerne un copolymère greffé à base d'un composant a) composé de silice ayant réagi avec un silane insaturé, et d'un composant polymère b) contenant de l'acide sulfonique. La silice employée est de préférence de la nanosilice et le silane insaturé est de préférence un alkoxysilane à insaturation éthylénique. Le composant b) est représenté par un copolymère à base d'acide acrylamido-méthyl-propane-sulfonique et d'un autre monomère à insaturation éthylénique. Le polymère selon l'invention, représentant en général un nanocomposite, est particulièrement adapté en tant qu'additif dans des applications chimiques de construction, et lors de la mise en exploitation, l'exploitation et la complétion de gisements souterrains de pétrole et de gaz naturel, l'effet dudit polymère en tant qu'agent de rétention d'eau à des salinités élevées et des températures augmentées étant particulièrement avantageux.

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