Clariant Corporation

Hoechst Aktiengesellschaft

Clariant Produkte (deutschland) Gmbh

Clariant UK Ltd.

Clariant Produkte Gmbh

Karl Heinz Heier

Aranka Tardi

Christoph Kayser

Rainer Kupfer

Gernold Botthof

Roman Morschh&auml;user

Michael Schaefer

Hermann Bieringer

Klaus Bauer

Matthias Krull

Matthias Löffler

Roman Morschhäuser

Roman Morschhaeuser

John V Hobes

Roland Bohm

Hans J Nestler

James Charles Morgan

Juergen Tonhauser

Alistair Manson Gunn

Manfred Schade

Reinhard J Oswald

Susanne Weber

Dan Patterson

Michael Schäfer

The invention relates to a copolymer containing: i) 80-90% by weight of one or more structural units of the formula A, where Ris hydrogen or methyl, Ris C-C-alkylene, and Meis an ammonium or an alkali metal ion; ii) from 1 to 10% by weight of one or more structural units of the formula B where Rand Rare each independently hydrogen, methyl or ethyl; iii) from 1 to 10% by weight of one or more structural units of the formula C, where n is a number from 1 to 6; iv) from 0.1 to 5% by weight of structural units of the formula D where X is hydrogen, an ammonium ion or an alkali metal ion; and optionally, v) from 0 to 10% by weight of one or more structural units of the formula E, where Ris hydrogen, methyl and/or ethyl, with the proviso that the content in the copolymers of structural units B) and C) is from 6 to 15% by weight.     

Thermally stable water-soluble polymer which is crosslinkable at high temperatures

A method for reducing or completely eliminating water influx in an oil or natural gas borehole includes introducing in the borehole an aqueous solution of a copolymer comprising: A) 40&#x2013;98 wt. % of structural units of formula (I), wherein: Ris hydrogen or methyl; Rrepresents C&#x2013;Calkylene; and Merepresents an ammonium metal ion and an alkali metal ion; B) 0.1 to 58 wt. % of structural units of formula (II); C) 0.1 to 10 wt. % of structural units of formula (III), wherein: Rand Rindependently of each other represent hydrogen, methyl or ethyl, or Rand Rrepresent together a propylene group, which, with inclusion of a radical (A), form a pyrrolidon radical or, with inclusion of a pentamethylene group, forms a caprolactam radical; D) 0.10 to 10 wt % of structural units of formula (IV). The method also includes introducing in the ground or deposit, simultaneously with the copolymer or subsequently, an agent for crosslinking the copolymer.

Method for reducing or completely eliminating water influx in an underground formation, and crosslinkable copolymers for implementing said method

The invention relates to compositions comprising copolymers based on acryloyldimethyltaurine and also synergistic additives selected from anionic, cationic, nonionic, and betaine surfactants. The compositions exhibit a pronounced thermoassociative behavior and are outstandingly suitable as thickeners. The copolymers of the present invention are useful in formulating cosmetics, pharmaceuticals, and oil field chemicals.

Compositions containing copolymers based on acryloyldimethyl aminoethylsulfonic acid and synergistic additives

Use of polymers as antimisting additives in water-based cooling lubricants

Water-soluble copolymers and their use for exploration and production of petroleum and natural gas

Copolymers and their use as drilling aids

The invention provides for the use of copolymers containing structural units derived from the compounds of the formulae 1 and 2

A process for improving the flow properties of mineral oils by adding a copolymer consisting of from 66 to 99.9 weight % of ethylene and of from 0.1 to 40 weight % of vinylic acid amide and optionally of further comonomers.

Process for improving the flow properties of mineral oils

Composition and process for promoting the growth of crop plants

Growing community of inventors

Frankfurt am Main, Germany

Karl Heinz Heier