Hydrophobically associating terpolymers of acrylamide, salts of

Details Hydrophobically associating terpolymers of acrylamide, salts of Hydrophobically associating terpolymers of acrylamide, salts of

1985-11-25

1987-09-15

Schofer, Joseph L.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525367, 525368, 525369, 525378, 5263031, 5263072, C08F 842

Patent

active

046940464

ABSTRACT:
Novel water soluble terpolymers of acrylamide, an alkali metal or ammonium salt of acrylic acid and an oil soluble or hydrophobic alkyl acrylamide monomer have been found to provide efficient viscosification of water or brine solutions. The polymers are prepared by a free radical micellar polymerization of acrylamide and alkyl acrylamide followed by base catalyzed partial hydrolysis. These terpolymers, called HRAM, impart unique and useful rheological properties to aqueous solutions. In a water or brine solution the hydrophobic groups associate to increase hydrodynamic size and enhance thickening efficiency. Solutions containing the HRAM terpolymers show increased viscosification at higher polymer concentration and reduced salt sensitivity relative to polyacrylamide based HPAM solutions.

REFERENCES:
patent: 4254249 (1981-03-01), Cottrell et al.
patent: 4395524 (1983-07-01), Emmons et al.
patent: 4520182 (1985-05-01), Turner et al.
patent: 4521580 (1985-06-01), Turner et al.
patent: 4528348 (1985-07-01), Turner et al.

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