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

Details Tetrapolymers of N-vinyl pyrrolidone/acrylamide/salt of acrylic Tetrapolymers of N-vinyl pyrrolidone/acrylamide/salt of acrylic

1985-12-30

1987-05-05

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526264, C08F 2006

Patent

active

046634088

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.+.

REFERENCES:
patent: 4395524 (1983-07-01), Emmons
patent: 4521580 (1985-06-01), Turner

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