Polyampholytes - high temperature viscosifiers for high ionic st

Compositions – Leather or fur treating

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252 851, C09K 700

Patent

active

046378820

ABSTRACT:
A new family of terpolymers based on V-vinyl-2-pyrrolidone/sodium styrene sulfonate/methacrylamidopropyltrimethylammonium chloride has been found to be an improved viscosity control additive for water-based drilling muds. The resultant muds display good viscosity characteristics, thermal stability and gel strength when formulated from the terpolymer intramolecular complex having the appropriate polymer concentration and salt level.

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patent: 3994852 (1976-11-01), Adams et al.
patent: 4079011 (1978-03-01), Tate
patent: 4460627 (1984-07-01), Weaver et al.
patent: 4460758 (1984-07-01), Peiffer et al.

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