Highly random acrylamide-acrylic acid copolymers
AssigneeEcolab USA Inc.
InventorsStephen Marrou, Xiangyang Zhu, Heqing Huang
Life of this patent
Estimating the term…
Abstract
Highly random acrylamide-acrylic acid copolymers are described. Ionic crosslinking of the highly random copolymers in dilute solution results in improved viscosity and gel strength compared to copolymers prepared by conventional methods. The ionically crosslinked copolymers are useful in enhanced oil recovery processes.
Claims9
A crosslinked composition comprising a water source, about 100 ppm to 1500 ppm of a copolymer of acrylamide and acrylic acid, and about 5 ppm to 100 ppm of an ionic crosslinker, wherein the copolymer has about 50 mole % to 80 mole % acrylamide residues and a blockiness index of about 0.90 to 1.1.
Dependencies are inferred from the claim text.