Water-soluble and biodegradable copolymers on a polyamide...

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 283/04 (2006.01) C04B 24/28 (2006.01) C04B 24/34 (2006.01) C09K 8/42 (2006.01) C09K 8/508 (2006.01) C09K 8/514 (2006.01)

Patent

CA 2660589

The invention relates to the use of copolymers on a polyamide basis, containing at least one graft lateral chain consisting of ethylenic unsaturated compounds, in construction chemistry, as well as with the prospecting, exploiting and completion of oil- and gas deposits and with deep bore holes. Preference is given to the use with compounds containing hydraulic binding agents, particularly as a water-retaining agent. The cementing of oil- and gas drillings is of particular importance. Typical representatives of the polyamide component are natural polyamides, like caseins, galantines, collagens and soy proteins. The copolymers used in the invention, having typically a molar mass of Mn > 20 000 g/mol, representatives being water-soluble and biodegradable are particularly preferred.

L'invention concerne l'utilisation de copolymères à base de polyamide, qui contiennent au moins une chaîne latérale constituée à partir de composés à insaturation éthylénique, dans des applications chimiques de la construction, ainsi que dans la reconnaissance, l'exploitation et la complétion de gisements souterrains de pétrole ou de gaz naturel et dans les forages en profondeur. Est préférée l'utilisation pour des compositions contenant des liants hydrauliques et ici en particulier comme moyen de rétention d'eau. Au premier plan, il s'agit surtout de la cimentation des forages de pétrole et de gaz. Des exemples représentatifs typiques des composants polyamides sont les polyamides naturels, à savoir les caséines, les gélatines, les collagènes et les protéines de soja. Pour les copolymères utilisés selon l'invention, qui présentent habituellement une masse molaire Mn > 20000 g/mol, sont en particulier préférés des exemples représentatifs hydrosolubles et biodégradables.

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