Conversion of polymer solutions into solids or more viscous solu

Details Conversion of polymer solutions into solids or more viscous solu Conversion of polymer solutions into solids or more viscous solu

1981-12-29

1983-10-25

Schofer, Joseph L.

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524378, 524390, 524574, 525387, C08K 501, C08K 507

Patent

active

044120281

ABSTRACT:
The present invention relates to a process for forming a gel having improved creep resistance at elevated temperatures and having a viscosity of at least about 100,000 cps which includes the steps forming a solvent system of an organic liquid and a water miscible cosolvent, the water miscible 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, adding a free radical generating initiator to the solution at a concentration level of about 0.01 to about 1%, a concentration of the neutralized sulfonated polymer in the solution being about 0.5 to about 20 wt. %, a viscosity of the solution being less than about 20,000 cps; and adding under shear conditions about 5 to about 500 vol. % water to the solution having a viscosity less than about 20,000 cps, the water being immiscible with the solution and the water miscible 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 100,000 cps.

REFERENCES:
patent: 2534078 (1950-12-01), Strain
patent: 2771458 (1956-11-01), Gilder et al.
patent: 2799662 (1957-07-01), Ernst et al.
patent: 3214252 (1965-10-01), Lehmacher
patent: 3776872 (1973-12-01), Heij et al.
patent: 4322329 (1982-03-01), Lundberg et al.
Hackh's Chemical Dictionary, p. 355.

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