US4702838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective and continuous removal of metal-ion contaminants from plating baths
Assignee: Bend Research Inc
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Filing: 1984-08-20
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Granted: 1987-10-27
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Expires: 2004-08-20
Abstract
Abstract A method is disclosed for the selective removal of metal ions from plating solutions comprising contacting the plating solutions with liquid organic complexing agents such as oximes or phosphoric acid esters or microporous material, preferably anisotropic, the microporous material being impregnated with such substances. The microporous material may be in various forms, including beads, fibers, sheets and gels. Copper, zinc and iron contaminants are effectively removed from nickel-plating solutions.
Inventors
- 👤 Walter C. Babcock
- 👤 Dwayne T. Friesen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:57
CPC Classifications
C; C25; C25D; C25D21/00; C25D21/16; C25D21/18; Y; Y10; Y10S; Y10S204/00; Y10S204/13
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
59 words
A method for the selective removal of copper from a nickel plating solution containing both copper and nickel ions comprising contacting the plating solution with a hydroxyoxime complexing agent of the formula ##STR3## wherein R 1 is hydrogen, alkyl, aryl and CH═N--OH; and R 2 , R 3 , R 4 and R 5 are hydrogen, alkyl and aryl.
Claim 2
Independent Claim
59 words
A method for the selective removal of copper from a nickel plating solution containing both copper and nickel ions comprising contacting the plating solution with a hydroxyoxime complexing agent of the formula ##STR3## wherein R 1 is hydrogen, alkyl, aryl and CH═N--OH; and R 2 , R 3 , R 4 and R 5 are hydrogen, alkyl and aryl.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein said complexing agent is impregnated into a polymeric microporous material.
Claim 4
Dependent Claim
12 words
The method of claim 2 wherein said polymeric microporous material is anisotropic.
Claim 5
Independent Claim
85 words
A method for the selective removal of copper from a nickel plating solution containing both copper and nickel ions comprising contacting the plating solution with a hydroxyoxime complexing agent of the formula ##STR4## wherein R 1 is hydrogen, alkyl, aryl and CH═N--OH; R 2 , R 3 , R 4 and R 5 are hydrogen, alkyl and aryl, and wherein said complexing agent is incorporated into a hydrophobic nonporous polymer plasticized and swollen with said complexing agent, thereby forming a gel of said complexing agent.
Claim 6
Independent Claim
85 words
A method for the selective removal of copper from a nickel plating solution containing both copper and nickel ions comprising contacting the plating solution with a hydroxyoxime complexing agent of the formula ##STR4## wherein R 1 is hydrogen, alkyl, aryl and CH═N--OH; R 2 , R 3 , R 4 and R 5 are hydrogen, alkyl and aryl, and wherein said complexing agent is incorporated into a hydrophobic nonporous polymer plasticized and swollen with said complexing agent, thereby forming a gel of said complexing agent.
Claim 7
Independent Claim
74 words
A method for the selective removal of iron or zinc from a nickel plating solution containing iron, zinc, and nickel ions comprising contacting said nickel plating solution with a phosphoric acid ester complexing agent of the formula ##STR5## wherein at least one R is alkyl or aryl, and wherein said complexing agent is incorporated into a hydrophobic nonporous polymer plasticized and swollen with said complexing agent, thereby forming a gel of said complexing agent.
Claim 8
Independent Claim
74 words
A method for the selective removal of iron or zinc from a nickel plating solution containing iron, zinc, and nickel ions comprising contacting said nickel plating solution with a phosphoric acid ester complexing agent of the formula ##STR5## wherein at least one R is alkyl or aryl, and wherein said complexing agent is incorporated into a hydrophobic nonporous polymer plasticized and swollen with said complexing agent, thereby forming a gel of said complexing agent.
Claim 9
Dependent Claim
19 words
The method of claim 4 or 5 wherein said polymer has been polymerized in the presence of said agent.
Claim 10
Dependent Claim
21 words
The method of claim 4 or 5 wherein said polymer is plasticized and swollen in the presence of an organic solvent.
Claim 11
Dependent Claim
45 words
The method of claim 4 or 5 wherein said polymer is selected from one or more of alkyl-, aryl-, halogen- and amino-substituted polyethylenes, polypropylenes, polyacrylics, polyacrylates, polymethacrylates, polyurethanes, polyamides, polyetherimides, polyvinyl-butyrals, polyacrylonitriles, polynorborenes, polyvinyl acetates, ehtylene-vinylacetate copolymers, ethylene-propylene rubbers, styrene butadiene rubbers, and silicone rubbers.
Claim 12
Dependent Claim
28 words
The method of claim 4 or 5 wherein said gel is within the pores of or coated onto solid microporous support media, selected from beads, fibers and sheets.
Claim 13
Dependent Claim
24 words
The method of claim 4 or 5 wherein said gel is coated onto a solid microporous support, said support itself containing said complexing agent.
Claim 14
Dependent Claim
22 words
The method of claim 1 wherein the hydroxyoxime is selected from 2-hydroxy-5-alkyl benzal-dehyde oximes; 2-hydroxy-alkylbenzophenone oximes; 2,6-diformyl-4-alkylphenol dioximes; and 5,8-diethyl-7-hydroxy- dodecane-6-one oxime.
Claim 15
Dependent Claim
35 words
The method of claim 3 wherein said polymeric anisotropic microporous material comprises beads having surface pores less than 0.1 micron in diameter and interior voids from about 10 microns to about 200 microns in diameter.
Claim 16
Dependent Claim
13 words
The method of claim 12 wherein said beads are contained in a column.
Claim 17
Dependent Claim
10 words
The method of claim 12 wherein said beads are polysulfone.
Claim 18
Independent Claim
139 words
A method for the selective of copper, zinc and iron ions from a nickel plating solution containing copper, zinc, iron, and nickel ions comprising circulating the solution around polymeric microporous anisotropic beads having surface pores less than 0.1 micron in diameter and interior voids from about 10 microns to about 200 microns in diameter, some of said beads being impregnated with a copper-selective ion-complexing agent comprising a hydroxyoxime of the formula ##STR6## wherein R 1 is hydrogen, alkyl, a and CH═N--OH; and R 2 , R 3 , R 4 and R 5 are hydrogen, alkyl and and the remainder of said beads being impregnated with a zinc- and iron-selective ion-complexing agent comprising a phosphoric acid ester of the formula ##STR7## wherein R is selected from hydrogen, alkyl and aryl and at least one R is alkyl or aryl.
Claim 19
Independent Claim
139 words
A method for the selective of copper, zinc and iron ions from a nickel plating solution containing copper, zinc, iron, and nickel ions comprising circulating the solution around polymeric microporous anisotropic beads having surface pores less than 0.1 micron in diameter and interior voids from about 10 microns to about 200 microns in diameter, some of said beads being impregnated with a copper-selective ion-complexing agent comprising a hydroxyoxime of the formula ##STR6## wherein R 1 is hydrogen, alkyl, a and CH═N--OH; and R 2 , R 3 , R 4 and R 5 are hydrogen, alkyl and and the remainder of said beads being impregnated with a zinc- and iron-selective ion-complexing agent comprising a phosphoric acid ester of the formula ##STR7## wherein R is selected from hydrogen, alkyl and aryl and at least one R is alkyl or aryl.
Claim 20
Dependent Claim
14 words
The method of claim 15 wherein said beads are contained in a packed column.
References Cited (Backward Citations)
US3506571A
Cited
US3682589A
Cited
US3666446A
Cited
US3775315A
Cited
US3703573A
Cited
US4052194A
Cited
US4108640A
Cited
US4191728A
Cited
US4437994A
Cited
US4317804A
Cited
US4528167A
Cited
US4500494A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-26 | 1991-04-27 | 1991-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-26 | 1995-04-27 | 1995-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-26 | 1999-04-27 | 1999-10-27 | $7700.00 | Window Closed / Lapsed |