Quaternized tertiary aminomethyl acrylamide polymer microemulsions with improved performance
AssigneeCytec Technology Corp.
InventorsSun Yi Huang, Andrea Leone-Bay, Joseph Michael 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.
Claims30
A method for treating a quaternized amino methylated acrylamide polymer microemulsion which comprises:
- (a) adding to said quaternized amino methylated acrylamide polymer microemulsion:
- (i) organic carboxylic acid in an amount sufficient to provide a pH of from about 3.6 to about 4.8 in the microemulsion;
- (ii) from about 0.01 to about 30 mole percent of a formaldehyde scavenger compound, based on the total moles of quaternized amino methylated acrylamide polymer microemulsion;
- and
- (iii) water in an amount such that the 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.degree. to about 80.degree. C. for from about 3 to about 20 hours.
A process for flocculating suspended solids comprising adding to said suspended solids a synthetic polymer flocculant material comprising a solution of a polymer produced by a method for treating a quaternized amino methylated acrylamide polymer microemulsion which comprises:
- (a) adding to said quaternized amino methylated acrylamide polymer microemulsion:
- (i) organic carboxylic acid in an amount sufficient to provide a pH of from about 3.6 to about 4.8 in the microemulsion;
- (ii) from about 0.01 to about 30 mole percent of a formaldehyde scavenger compound, based on the total moles of quaternized amino methylated acrylamide polymer microemulsion;
- and
- (iii) water in an amount such that the 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.degree. to about 80.degree. C. for from about 3 to about 20 hours.
Dependencies are inferred from the claim text.