Clariant International Ltd

Clariant Produkte (deutschland) Gmbh

Clariant UK Ltd.

Michael Schaefer

Christoph Kayser

Matthias Krull

Karl Heinz Heier

Aranka Tardi

Michael Feustel

Roman Morschhaeuser

James Charles Morgan

Gernold Botthof

Alistair Manson Gunn

Anton Kaiser

Rashod Smith

This invention relates a wax inhibitor for hydrocarbon oils comprising an esterified copolymer having repeating structural units derived from an esterified ethylenically unsaturated dicarboxylic acid and &#x3b1;-olefins having at least 18 carbon atoms, whereof at least 3 mol-% of the &#x3b1;-olefins have 30 or more carbon atoms, and wherein the ethylenically unsaturated dicarboxylic acid has been esterified with a mixture of alcohols comprising

Polymeric pour point depressants for waxy crude oils

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

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Gruendau, Germany

Michael Schaefer