Patent US4412922A successfully refreshed from Google Patents.
US4412922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Positive-charged ultrafiltration membrane for the separation of cathodic/electrodeposition-paint compositions
Assignee: Kovalus Separation Solutions LLC
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Filing: 1981-09-21
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Granted: 1983-11-01
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Expires: 2001-09-21
Abstract
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.
Inventors
- 👤 Leon Mir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:19
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0081; B01D67/0088; B01D61/00; B01D61/42; B01D61/425; B01D67/0093; B01D69/00; B01D69/12; B01D71/00; B01D71/06; B01D71/30; B01D71/32; B01D71/34; B01D71/76; B01D71/80; C; C25; C25D; C25D13/00; C25D13/22; C25D13/24
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
98 words
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.
Claim 2
Independent Claim
98 words
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.
Claim 3
Dependent Claim
31 words
The method of claim 1 wherein the negative-charged polymer material comprises polyvinylidene fluoride polymer blended with a vinyl amino compound having the structure: ##STR2## to provide a sulfonated polyvinylidene fluoride polymer.
Claim 4
Dependent Claim
13 words
The method of claim 1 wherein the polymer membrane comprises a sulfonated polymer.
Claim 5
Dependent Claim
17 words
The method of claim 1 wherein the polymer membrane comprises a polyvinylidene fluoride polymer having sulfonated groups.
Claim 6
Dependent Claim
13 words
The method of claim 1 wherein the polyelectrolyte comprises a polyalkylene imine polymer.
Claim 7
Dependent Claim
13 words
The method of claim 1 wherein the polyelectrolyte comprises a polyethylene imine polymer.
Claim 8
Dependent Claim
21 words
The method of claim 1 which includes contacting the polymer membrane material with an aqueous solution of a polyethylene imine polymer.
Claim 9
Dependent Claim
37 words
The method of claim 1 wherein the polymer membrane material contains fixed negative-charged groups selected from the group consisting of SO 3 - , PO 3 - , PO 4 - and COO - and combinations thereof.
Claim 10
Dependent Claim
27 words
The method of claim 1 which includes dissolving the polyelectrolyte polymer in a solvent for the polyelectrolyte, which solvent is a nonsolvent for the polymer membrane material.
Claim 11
Dependent Claim
50 words
The method of claim 1 which comprises contacting the polymer membrane material with an aqueous solution of from about 0.1% to 10% by weight of a polyethylene imine at a temperature of from about 5° C. to 70° C. and at a pressure of from about 5 to 100 psig.
Claim 12
Dependent Claim
45 words
The method of claim 1 wherein the polymer membrane material is selected from the group consisting of acrylic acid copolymers above pH 5.5, vinyl sulfonic acid copolymers, styrene sulfonic acid copolymers, methallyl sulfonic acid copolymers, p-(methylenephosphoric acid)-vinyl benzene copolymers and blends with polyvinylidene fluoride polymer.
Claim 13
Independent Claim
88 words
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; and (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.
Claim 14
Independent Claim
88 words
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; and (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.
Claim 15
Dependent Claim
55 words
The method of claim 12, which method includes flowing a solution, containing from about 0.1% to 1% by weight of the polyethylene imine polymer, into contact with the surface of the polymer membrane at a pressure of from about 10 to 50 psig and at a temperature of from about 15° C. to 50° C.
Claim 16
Dependent Claim
49 words
The method of claim 1 which comprises contacting the polymer membrane with an aqueous solution of from about 0.1% to 10% by weight of a polyethylene imine at a temperature of from about 5° C. to 70° C. and at a pressure of from about 5 to 100 psig.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-31 | 1987-05-02 | 1987-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-31 | 1991-05-02 | 1991-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-31 | 1995-05-02 | 1995-11-01 | $7700.00 | Window Closed / Lapsed |