Tougas Oilfield Solutions Gmbh

Allessa Chemie Gmbh

Anja Obermüller

Friedrich Engelhardt

Joachim Christian

Christian Bremer

Werner Spielmann

Disclosed are stabilized aqueous polymer compositions containing A) a stabilizing amount of a least a sulfur dye or containing a stabilizing amount of a sulfur dye with a compound comprising a heterocyclic system containing nitrogen and sulphur as ring heteroatoms and B) at least one polymer comprising groups which are capable of complex formation with ions. The aqueous polymer compositions are stabilized against thermal or other degradation processes of the polymer by addition of component A) to allow their use even under harsh conditions.

Stabilized aqueous polymer compositions and their use

The aqueous polymer composition comprises a water soluble polymer having a molar weight of at least 10Daltons and comprising functional groups which may form complexes with metal ions. The aqueous polymer compositions of this invention are stabilized against thermal or other degradation processes by addition of a phenothiazine compound to allow their use even under harsh conditions.

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Munich, Georgia

Anja Obermüller