| 摘要 |
This invention relates to a 1-8% crosslinked terpolymer of a C1-C4 alkyl vinyl ether, maleic anhydride and a hydrophobic C6 to C18 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. |
