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Patent US3886054A successfully refreshed from Google Patents.
US3886054A
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Alkaline bright zinc plating
Assignee: Richardson Chemical Co
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Filing: 1973-09-24
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Granted: 1975-05-27
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Expires: 1993-09-24
Abstract
Abstract Non-cyanide, alkaline electroplating baths for bright zinc plating containing quarternized polymeric condensates of alkylene polyamines and 1,3-dihalo-2-propanol as grain refiners preferably in admixture with aldehyde type brighteners and mercapto substituted heterocyclic compounds capable of producing the bright, fine grained deposits over a broad current density range.
Inventors
- 👤 Joseph R Duchene
- 👤 Christopher Philip J De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:42
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/22
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
63 words
A BRIGHT ZINC, CYANIDE-FREE ELECTROPLATING BATH COMPRISING AN AQUEOUS ALKALINE SOLUTION CONTAINING A SOURCE OF ZINC IONS, AND FROM ABOUT 0.25 TO ABOUT 5 GRAMS PER LITER OF A QUARTERNIZED POLYMERIC CONDENSATE OF AN ALKYLENE POLYAMINE HAVING AT LEAST ONE TERTIARY AMINO GROUP AND A 1,3-DIHALO-2PROPANOL WHERE THE MOL RATIO OF THE POLYAMIDE TO THE DIHALOPROPANOL RANGES FROM ABOUT 5.0:1 TO 1.75:1, RESPECTIVELY.
Claim 2
Dependent Claim
63 words
A BRIGHT ZINC, CYANIDE-FREE ELECTROPLATING BATH COMPRISING AN AQUEOUS ALKALINE SOLUTION CONTAINING A SOURCE OF ZINC IONS, AND FROM ABOUT 0.25 TO ABOUT 5 GRAMS PER LITER OF A QUARTERNIZED POLYMERIC CONDENSATE OF AN ALKYLENE POLYAMINE HAVING AT LEAST ONE TERTIARY AMINO GROUP AND A 1,3-DIHALO-2PROPANOL WHERE THE MOL RATIO OF THE POLYAMIDE TO THE DIHALOPROPANOL RANGES FROM ABOUT 5.0:1 TO 1.75:1, RESPECTIVELY.
Claim 3
Dependent Claim
23 words
THE ELECTROPLATING BATH OF CLAIM 1 WHEREIN THE BATH CONTAINS FROM ABOUT 0.1 TO ABOUT 5 GRAMS PER LITER OF AN ALDEHYDE BRIGHTENER.
Claim 4
Dependent Claim
26 words
The electroplating bath of claim 2 wherein the bath contains from about 0.01 to about 0.2 grams per liter of a heterocyclic compound of the formula:
Claim 5
Dependent Claim
12 words
The electroplating bath of claim 3 wherein the heterocyclic compound is 2-thiouracil.
Claim 6
Dependent Claim
12 words
The electroplating bath of claim 3 wherein the heterocyclic compound is 2-mercaptopyrimidine.
Claim 7
Dependent Claim
12 words
The electroplating bath of claim 3 wherein the heterocyclic compound is 2,4-dimercaptopyrimidine.
Claim 8
Dependent Claim
12 words
The electroplating bath of claim 3 wherein the heterocyclic compound is 2-mercapto-4-amino-6-hydroxypyrimidine.
Claim 9
Dependent Claim
12 words
The electroplating bath of claim 3 wherein the heterocyclic compound is 5-carboxy-2-mercaptopyridine.
Claim 10
Dependent Claim
12 words
The electroplating bath of claim 3 wherein the heterocyclic compound is 3-hydroxy-2-mercaptopyridine.
Claim 11
Dependent Claim
11 words
The electroplating bath of claim 3 wherein the heterocyclic is 2-mercapto-4,6,-dihydroxypyrimidine.
Claim 12
Dependent Claim
23 words
The electroplating bath of claim 3 wherein the heterocyclic compound is 2-thiouracil and the aldehyde is a mixture of anisic aldehyde and vanillin.
Claim 13
Dependent Claim
23 words
The electroplating bath of claim 3 wherein the heterocyclic compound is 2-mercapto-4,6-dihydroxypyrimidine and the aldehyde is a mixture of anisic aldehyde and vanillin.
Claim 14
Dependent Claim
15 words
The electroplating bath of claim 2 wherein the brightener is an aldehyde having the formula
Claim 15
Dependent Claim
13 words
The electroplating bath of claim 13 wherein the aldehyde brightener is a benzaldehyde.
Claim 16
Dependent Claim
11 words
The electroplating bath of claim 13 wherein the aldehyde is vanillin.
Claim 17
Dependent Claim
12 words
The electroplating bath of claim 13 wherein the aldehyde is anisic aldehyde.
Claim 18
Dependent Claim
11 words
The electroplating bath of claim 13 wherein the aldehyde is p-hydroxy-benzaldehyde.
Claim 19
Dependent Claim
35 words
THE ELECTROPLATING BATH OF CLAIM 1 WHEREIN THE BATH CONTAINS FROM ABOUT 0.01 TO ABOUT 0.2 GRAMS PER LITER OF A HETEROCYCLIC COMPOUND SELECTEED FROM THE GROUP CONSISTING OF A 2-MERCAPTO SUBSTITUTED PYRIDINE OR PYRIMIDINE.
Claim 20
Dependent Claim
39 words
The electroplating bath of claim 18 wherein the polymeric condensate and heterocyclic compound are present in the bath with the ranges of from about 0.3 to about 0.75 and from about 0.025 to about 0.075 grams per liter, respectively.
Claim 21
Dependent Claim
19 words
The electroplating bath of claim 1 wherein the source of the zinc ions is a water soluble zinc salt.
Claim 22
Dependent Claim
13 words
The electroplating bath of claim 20 wherein the zinc salt is zinc sulfate.
Claim 23
Dependent Claim
15 words
The electroplating bath of claim 1 wherein in the polymeric condensate the dihalopropanol is 1,3-dichloro-2-propanol.
Claim 24
Dependent Claim
43 words
The electroplating bath of claim 1 wherein in the polymeric condensate the alkylene polyamine has a tertiary amino group substituted with alkyl groups of from 1 to 5 carbon atoms and the alkylene bridge contains from about 2 to about 5 carbon atoms.
Claim 25
Dependent Claim
16 words
The electroplating bath of claim 1 wherein in the polymeric condensate the alkylene polyamine is dimethylaminopropylamine.
Claim 26
Dependent Claim
45 words
The electroplating bath of claim 1 wherein in the polymeric condensate the alkylene polyamine is dimethylaminopropylamine and the dihalopropanol is 1,3-dichloro-2-propanol and the mol ratio of the polyamine to the 1,3-dichloro-2-propanol ranges from about 0.8:1 to about 1.5:1, respectively and the condensate is substantially uncrosslinked.
Claim 27
Dependent Claim
28 words
The electroplating bath of claim 1 wherein the polymeric condensate is present in the bath within the range of from about 0.3 to about 0.75 grams per liter.
Claim 28
Dependent Claim
26 words
The electroplating bath of claim 1 wherein the bath contains a polyvinyl alcohol within the range of from about 0.02 to about 0.2 grams per liter.
Claim 29
Dependent Claim
12 words
The electroplating bath of claim 1 wherein the pH is above 14.
Claim 30
Dependent Claim
25 words
In a process for the electroplating of zinc the improvement comprising effecting the electroplating with the alkaline bath of claim 1 free from any cyanide.
Claim 31
Dependent Claim
33 words
The process of claim 29 wherein the plating is conducted at a temperature of from about 60* to about 100*F and at a current density of up to 200 amperes per square foot.
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) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |