Quaternized tertiary aminomethyl acrylamide polymer microemulsions with improved performance
AssigneeCytec Technology Corp.
InventorsSun Y. Huang, Andrea Leone-Bay, Joseph M. Schmitt, Paul S. Waterman
Life of this patent
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Abstract
Quaternized tertiary aminomethyl acrylamide polymer emulsions are treated by 1) adjusting the pH to about 3.6 to about 4.8, 2) adding a formaldehyde scavenger, 3) adjusting the water content of the aqueous phase to result in about 10-45 weight percent of quaternized aminomethylated acrylamide polymer and 4) heating the resultant emulsion at from about 40.degree. C. to about 80.degree. C. for about 3 to about 20 hours so as to render them more stable, capable of inversion in water independent of water temperature or pH of the medium flocculant and superior dewatering ability.
Claims13
A method of treating a water-in-oil microemulsion containing, as the dispersed phase, an aqueous solution of a quaternized amino methylated acrylamide polymer which comprises:
- (a) adding to said microemulsion:
- (i) acid in an amount sufficient to provide a pH of from about 3.6 to about 4.8 in the microemulsion;
- (ii) from about 0.1 to about 30 mole percent of a formaldehyde scavenger, based on the total moles of quaternized amino methylated acrylamide polymer in the microemulsion;
- and
- (iii) water in an amount such that the dispersed aqueous phase of the resulting microemulsion comprises from about 10 to about 45 weight percent of quaternized amino methylated acrylamide polymer;
- and
- (b) heating the microemulsion obtained in step (a) to a temperature of from about 40 to about 80.degree. C. for from about 3 to about 20 hours,
- wherein the quaternized amino methylated acrylamide polymer is substituted with at least about 1 mole percent of tertiary aminomethyl groups and the dispersed aqueous phase comprises droplets having an average size of from about 200 to about 4000 .ANG. in diameter.
Dependencies are inferred from the claim text.