| abstract |
A process of making a water-in-oil emulsion which contains from 5-60% by weight of a hydrophobic acrylamide terpolymer composed of the random repeating units: <IMAGE> where: R is methyl or hydrogen, M is hydrogen, alkali metal, ammonia, or amine, R1 is a hydrophobic radical, with the mol ratio of A:B:C being A(2-50):B(50-98):C(0.1-15), which comprises reacting a 5-60% by weight water-in-oil emulsion of an acrylamide polymer with a hydrophobic amine at a temperature above 120 DEG C. for a period of time sufficient to transamidate the acrylamide groups in the acrylamide polymer with the hydrophobic amine. |