Positive-charged ultrafiltration membrane for the separation of cathodic/electrodeposition-paint compositions
AssigneeAbcor, Inc.
InventorLeon Mir
Life of this patent
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Abstract
A method for preparing a fouling-resistant polymer membrane for use in the separation of aqueous, cathodic, electrode-position-paint compositions, which method comprises treating a negative-charged polymer membrane material, having fixed negative-charged groups in the polymer, with a polyelectrolyte polymer having fixed positive-charged nitrogen groups in an amount sufficient to provide for an excess of positive-charged groups in the treated membrane polymer.
Claims14
A method for the concentration of an aqueous cationic electrodeposition-paint composition, which method comprises:
- (a) providing a foul-resistant polyvinylidene fluoride polymer membrane prepared by treating a negative-charged polymer membrane material, having fixed negative-charged groups in the polymer, with a polyelectrolyte polymer having fixed positive-charged nitrogen groups in an amount sufficient to provide for an excess of positive-charged groups in the treated membrane polymer;
- and
- (b) employing the foul-resistant polymer membrane in the ultrafiltration concentration of a cationic electrodeposition-paint composition, whereby concentration of the paint composition is accomplished with high flux rate and with a long membrane use life.
A method for the concentration of an aqueous cationic electrodeposition-paint composition, which method comprises:
- (a) providing a foul-resistant polymer membrane prepared by contacting a negative-charged, sulfonated, polyvinylidene fluoride polymer membrane with a solution containing a polyethylene imine polymer in an amount sufficient to provide a treated polymer membrane having an excess of positive charges;
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- (b) employing the foul-resistant polymer membrane in the ultrafiltration concentration of cationic electrodeposition-paint composition, whereby concentration of the paint composition is accomplished with high flux rate and with a long membrane use life.
Dependencies are inferred from the claim text.