Process for controlled gelation of polymeric solution (C-669)

Details Process for controlled gelation of polymeric solution (C-669) Process for controlled gelation of polymeric solution (C-669)

1979-12-21

1981-08-04

Michl, Paul R.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 296PM, C08F 836

Patent

active

042821304

ABSTRACT:
The present invention relates to a process for forming a polymeric solution or gel having a viscosity of at least about 50,000 cps which includes the steps forming a solvent system of an organic liquid and a polar cosolvent, the polar cosolvent being less than about 15 wt. % of the solvent system, a viscosity of the solvent system being less than about 1000 cps; dissolving a neutralized sulfonated polymer in the solvent system to form a solution, a concentration of the neutralized sulfonated polymer in the solution being about 0.1 to about 20 wt. %, a viscosity of the solution being less than about 20,000 cps; and adding about 5 to about 500 vol. % water to the solution having viscosity less than about 20,000 cps, the water being immiscible with the solution and the polar cosolvent transferring from the solution phase to the water phase thereby causing the viscosity of said solution to increase from less than 20,000 cps to greater than 50,000 cps.

REFERENCES:
patent: 2809959 (1957-10-01), Roth
patent: 2813087 (1957-11-01), Roth
patent: 3554287 (1971-01-01), Eilers
patent: 3870841 (1975-03-01), Makowski
patent: 3888945 (1975-06-01), Arndt
patent: 4157432 (1979-06-01), Lundberg
patent: 4226751 (1980-10-01), Lundberg

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