Process for preparing hydrophobically associating terpolymers co

Details Process for preparing hydrophobically associating terpolymers co Process for preparing hydrophobically associating terpolymers co

1986-03-28

1988-03-08

Henderson, Christopher

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526209, 526287, C08F 226, C08F 230

Patent

active

047300280

ABSTRACT:
A process is described for producing unique and novel sulfonate-containing terpolymers of water soluble monomers with water insoluble monomers which are efficient viscosifiers of aqueous and brine media. The process relies on the complete solubilization of the water insoluble monomer by means of a dilute solution of a suitable water soluble surfactant. The type and concentration of surfactant are chosen to produce a clear, uniform, homogeneous aqueous dispersion of the hydrophobic monomers in the presence of both nonionic and anionic water soluble monomers, and, in addition, the reaction medium remains a clear, uniform, homogeneous mixture with no phase separation as the reaction proceeds to completion. Thus, the terpolymerization is effected without the formation of latexes or fine particulates of water insoluble polymer.
The terpolymers, which may be isolated from the reaction mixture, provide efficient viscosification of water or brine solutions. The anionic sulfonate groups improve polymer solubility in water and brine, particularly in the presence of salts containing divalent cations, and impart some chain stiffness due to charge repulsion, particularly in water containing low electrolyte concentration. The hydrophobic N-alkylacrylamide groups associate in solution to create a structure with an apparent increase in molecular weight, resulting in enhanced thickening efficiency.

REFERENCES:
patent: 3607817 (1971-09-01), Trapasso
patent: 3692673 (1972-09-01), Hoke
patent: 4246154 (1981-01-01), Yao

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