Tetrapolymers of N-vinyl pyrrolidone/acrylamide/salt of acrylic acid/N-alkyl acrylamide

US4663408A · kind A · utility

Assignee

• Exxon Research and Engineering Company · US

Inventors

• Donald N. Schulz · Annandale, US
• Enock Berluche · Phillipsburg, US
• John J. Maurer · New Providence, US
• Jan Bock · Piscataway, US

Key dates

• Filing date: Dec 30, 1985
• Grant date: May 5, 1987
• Expiry date: Dec 30, 2005

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K8/12
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to improved viscosification agents for an aqueous or brine solutions. Typically, the viscosification agents are tetrapolymers of N-vinyl pyrrolidone/acrylamide/salt of acrylic acid/N-alkyl acrylamide wherein said tetrapolymers have the formula: ##STR1## wherein w is about 1 to about 80 mole percent, more preferably about 5 to about 75 mole percent, and most preferably about 10 to about 70 mole percent; x is about 10 to about 90 mole percent, more preferably about 20 to about 80 mole percent, and most preferably about 30 to about 70 mole percent; and y is about 0.1 to about 10.0 mole percent, more preferably about 0.15 to about 5.0 mole percent; and most preferably about 0.2 to about 3.0 mole percent; z is about 1.0 to about 30.0 mole percent, more preferably about 2.0 to about 25.0 mole percent, and most preferably about 5.0 to about 20.0 mole percent; R is an alkyl group having about 6 to about 30 carbon atoms, more preferably about 7 to about 20, and most preferably about 8 to about 18; and M is a cation selected from the group consisting of monovalent cations, preferably Na.sup.+, K.sup.+ or R.sub.4 N.sup.+.