Water-soluble copolymers useful in drilling fluids

US5510436A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Martin Hille · Liederbach, DE
• Heinz Wittkus · Frankfurt am Main, DE
• Jürgen TONHAUSER · Oestrich-Winkel, DE
• Fritz Engelhardt · Frankfurt am Main, DE
• Ulrich Riegel · Landstuhl, DE

Key dates

• Filing date: Jun 15, 1994
• Grant date: Apr 23, 1996
• Expiry date: Jun 15, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K8/487
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The water-soluble copolymer comprises 5-90% by weight of groups of the formula ##STR1## in which R.sup.1 is hydrogen or methyl, R.sup.2 is C.sub.2 -C.sub.10 -alkylene, and Me is ammonium or an alkali metal, 5-90% by weight of groups of the formula EQU --CH.dbd.CH--CH.sub.2 --N.sup.+ R.sup.3 R.sup.4 --CH.sub.2 --CH.dbd.CH-- X.sup.- II in which X is a halogen, R.sup.3 and R.sup.4, independently of one another, are C.sub.1 -C.sub.6 -alkyl, 0-60% by weight of groups of the formula ##STR2## in which R.sup.5 and R.sup.6 together are a propylene group which with inclusion of the radical ##STR3## forms a pyrrolidone radical, and 0-30% by weight of groups of the formula EQU --CHR.sup.7 --CHR.sup.8 -- IV in which R.sup.7 is hydrogen or methyl and R.sup.8 is CONH.sub.2, CON(CH.sub.3).sub.2, cyano, SO.sub.3 H, SO.sub.3 Me, C.sub.6 H.sub.4 SO.sub.3 H, C.sub.6 H.sub.4 SO.sub.3 Me, CH.sub.2 SO.sub.3 H, CH.sub.2 SO.sub.3 Me, COOH, COOMe, or carboxy-C.sub.1 -C.sub.15 --alkyl, and Me is an ammonium cation or an alkali metal cation, and the order of components I to IV can be as desired. The copolymer is used as water-binding additive for suspensions of solids, preferably for cement slurries, gypsum s…