Crosslinked terpolymers of high salt tolerance

Details Crosslinked terpolymers of high salt tolerance Crosslinked terpolymers of high salt tolerance

1993-12-21

1994-11-08

Schofer, Joseph L.

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

526271, 526272, C08K 300, C08F22204

Patent

active

053627890

ABSTRACT:
This invention relates to a 1-8% crosslinked terpolymer of alkyl vinyl ether, maleic anhydride and a C.sub.10 to C.sub.20 alkyl (meth)acrylate in a critical molar ratio of from 1-3:1:0.01-0.08, which polymer has a pH of from about 4 to about 11, a Brookfield viscosity of from about 10,000 to about 150,000 cps and is characterized as having significantly improved salt tolerance and stability. The invention also relates to liquid or gel compositions of the crosslinked terpolymer containing a salt and a method for the preparation of said crosslinked terpolymer gel.

REFERENCES:
patent: 3436378 (1969-04-01), Azorlosa et al.
patent: 3697618 (1972-10-01), Grunewalder et al.
patent: 3915921 (1975-10-01), Schlatzer, Jr.
patent: 5082913 (1992-01-01), Tazi et al.

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