Water soluble copolymers

US4551513A · kind A · utility

Assignees

• Cassella Aktiengesellschaft · DE
• Dresser Industries, Inc. · US

Inventors

• Friedrich Engelhardt · Frankfurt, DE
• Klaus Kuhlein · Kelkheim, DE
• Ulrich Riegel · Landstuhl, DE
• Sigmar-Peter von Halasz · Kelkheim, DE
• Jeffery C. Dawson · Katy, US
• Anthony R. Reed · Houston, US

Key dates

• Filing date: Oct 18, 1984
• Grant date: Nov 5, 1985
• Expiry date: Oct 18, 2004

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K2208/28
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

New copolymers soluble in water and aqueous acids are disclosed comprising in a statistical distribution in the macromolecule at least 5% by weight of entities containing a formylamino functionality and at least 10% by weight of entities containing an amino carbonyl functionality, which are stable in high concentrations of Bronsted-Lowery acids and can be used as friction reducers in the stimulation of oil or gas wells.