Patent ID: 7582713

Claim:
A process for preparing an ion exchange polymer dispersion comprising: preparing a uniform dispersion of an ion exchange polymer having an initial viscosity; filtering the uniform dispersion of an ion exchange polymer having an initial viscosity wherein coarse particles are removed from the uniform dispersion of an ion exchange polymer having an initial viscosity; and applying either an ultrasonic vibration or a shearing force to the uniform dispersion of an ion exchange polymer to increase the viscosity to 2-2000 times the initial viscosity; wherein the filtering the uniform dispersion comprises filtering through a filter having a pore diameter of from 0.5 to 30 μm, the uniform dispersion of an ion exchange polymer comprises a monohydric or a polyhydric alcohol, the ion exchange polymer is a fluorinated polymer comprising sulfonic acid groups; and the viscosity is measured at 25° C. at a shear rate of 10 (1/s), and wherein if ultrasonic vibration is applied, a power of 30 to 2,000 W is applied to the uniform dispersion of an ion exchange polymer in the ultrasonic vibration, or if the shearing force is applied to the uniform dispersion of an ion exchange polymer, the shearing force is in the range of 1,000 to 50,000 rpm.