Calcium-tolerant N-substituted acrylamides as thickeners for aqu

Details Calcium-tolerant N-substituted acrylamides as thickeners for aqu Calcium-tolerant N-substituted acrylamides as thickeners for aqu

1985-06-12

1986-04-22

Michl, Paul R.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526304, C08F12058

Patent

active

045843589

ABSTRACT:
A water-soluble ionically-charged random copolymer of acrylamide and an alkaline or alkali metal 3-acrylamido-3-methylbutanoate having an average molecular weight of greater than about 50,000 has been found to maintain unusually stable and effective viscosities in the presence of salts such as NaCl and CaCl.sub.2 when added to water in minor amounts, thus making it a highly effective mobility control agent for secondary and tertiary oil recovery methods. Also within the scope of the invention are terpolymers which additionally contain olefinically unsaturated monomers such as acrylic acid or sodium acrylate.

REFERENCES:
patent: 4438246 (1984-03-01), Bush
J. Polymer Science, vol. 10, pp. 3311-3315, 1972.

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