Teknologian Tutkimuskeskus Vtt Oy

Kemira Oyj

Csk Food Enrichment B.v.

Leena Nurmi

Ali Harlin

Susanna Toivonen

Jarmo Ropponen

Jan Kevelam

Thomas Gädda

Pia Willberg-Keyriläinen

Louis Rosati

Willem Cornelis Meijer

Harri Heikkinen

Virpi Rämö

Jun Shan

Mika Härkönen

Sirkku Hanski

Wieger Jan Koopmans

Thomas GÄDDA

The present embodiments generally relate to methods and compositions comprising one or more polymers which gradually increase in charge, thereby providing for an increase in viscosity in an aqueous solution or aqueous composition, such as when present in a desired aqueous environment. Use of such compositions and methods comprising one or more polymers which gradually increase in charge, thereby providing for an increase in viscosity in an aqueous solution or aqueous composition during enhanced oil recovery may result in an increase in oil production relative to methods and/or compositions which do not comprise one or more polymers which gradually increase in charge, thereby providing for an increase in viscosity in an aqueous solution or aqueous composition.

Charge developing polymer compositions and methods of use for for enhanced oil recovery

Described herein is a feasible, significantly simplified production method that avoids challenging lactonization steps and converts a low molecular weight aliphatic polyester, consisting of hydroxy acids and a comonomer, whose molecular weight has been increased by step-growth polymerization reactions. The molecular weight of the aliphatic polyester, based on comparison of initial and final weight average molecular weights (M/M), increased significantly at a rate which permits the use of reactive extrusion to produce high molecular weight aliphatic polyesters in a simple, economically feasible manner.

Method of producing glycolic acid polymers

The present invention relates to a method for preparation a glycolide polyester by ring opening polymerization characterized in that glycolide monomer with optional co-monomer(s) of cyclic ester(s) is/are subjected to ring opening polymerization in the presence of a dispersion stabilizer and a catalyst, said catalyst being selected for precipitating glycolide homopolymer or copolymer from solvent, said solvent being selected so that the glycolide monomer and the optional co-monomer(s), the dispersion stabilizer and the catalyst are soluble therein but said glycolide homopolymer or copolymer is non-soluble. The present invention further relates to an in situ ring opening polymerizing process product, and to use of said glycolide polyester, and to further processing of said glycolide polyester.

Method for preparing glycolide polyester by ring opening polymerization

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Espoo, Finland

Leena Nurmi