Crosslinked terpolymers of high salt tolerance

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

1996-02-01

1996-10-22

Yoon, Tae

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526332, 424 7011, C08F22206, C08F21612

Patent

active

055677878

ABSTRACT:
This invention relates to a 1-8% crosslinked terpolymer of a C.sub.1 -C.sub.4 alkyl vinyl ether, maleic anhydride and a hydrophobic C.sub.6 to C.sub.18 alkyl vinyl ether in a critical molar ratio of from 1-3:1:0.01-0.20, 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 desirable salt tolerance enhanced viscosity, stability, low residual monomers and enhanced use characteristics. The invention also relates to liquid or aqueous gel compositions of the crosslinked terpolymer containing a salt and a method for the preparation of said crosslinked terpolymer gel.

REFERENCES:
patent: 5037924 (1991-08-01), Tazi et al.
patent: 5082913 (1992-01-01), Tazi et al.
patent: 5145669 (1992-09-01), Kwak et al.
patent: 5214089 (1993-05-01), Login et al.
patent: 5326555 (1994-07-01), Hardy et al.
patent: 5362789 (1994-11-01), Kwak et al.
patent: 5385729 (1995-01-01), Prencipe et al.

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