US3915815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkaline zinc electroplating bath
Assignee: Individual
•
Filing: 1973-11-14
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Granted: 1975-10-28
•
Expires: 1993-11-14
Abstract
Abstract The alkaline zinc electroplating bath of the present invention contains as brightening agent the reaction product of A. POLYETHYLENE IMINE OR POLYPROPYLENE IMINE WITH B. AN AROMATIC ALDEHYDE, C. AMMONIA AND/OR ETHYLENEDIAMINE, OR DIETHYLENE TRIAMINE AND D. EPICHLOROHYDRIN. Due to the addition of said reaction product its cyanide content can be considerably reduced without impairing the brightness of the zinc deposit.
Inventors
- 👤 Reinhard Koch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:10
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/22; C25D3/24; Y; Y10; Y10S; Y10S524/00; Y10S524/901
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
141 words
IN AN ALKALINE ZINC ELECTROPLATING BATH COMPRISING, IN AQUEOUS SOLUTION, A ZINC SALT, AN ALKALI METAL CYANIDE, AN ALKALI METAL HYDROXIDE, AND A WATER-SOLUBLE POLYVINYLALCOHOL, THE IMPROVEMENT WHICH COMPRISES SAID BATH CONTAINING, AS BTIGHTENING AGENT, BETWEEN ABOUT 0.1 G./1. AND ABOUT 10.0 G/1. OF THE REACTION PRODUCT OBTAINED BY REACTING IN AN AQUEOUS MEDIUM AT A TEMPERATURE BETWEEN ABOUT 20* AND 50*C. A. A POLYALKYLENE IMINE SELECTED FROM THE GROUP CONSISTING OF POLYETHYLENE IMINE AND POLUPROPYLENE IMINE, WITH B. AN AROMATIC ALDEHYDE, IN A MOLAR RATIO BETWEEN ABOUT 1:1 TO 1:50 OF IMINE TO ALDEHYDE, ADDING C. A BASIC AGENT SELECTED FROM THE GROUP CONSISTING OF AMMONIA, ETHYLENE DIAMINE, AND DIETHYLENE TRIAMINE, AND D. EPICHLOROHYDRIN, IN A MOLAR RATIO BETWEEN ABOUT 1:3 TO 1:40 OF IMINE TO EPICHLOROHYDRIN AND ABOUT 1:1 OF BASIC AGENT TO EPICHLOROHYDRIN, AND HEATING THE REACTION MIXTURE.
Claim 2
Dependent Claim
141 words
IN AN ALKALINE ZINC ELECTROPLATING BATH COMPRISING, IN AQUEOUS SOLUTION, A ZINC SALT, AN ALKALI METAL CYANIDE, AN ALKALI METAL HYDROXIDE, AND A WATER-SOLUBLE POLYVINYLALCOHOL, THE IMPROVEMENT WHICH COMPRISES SAID BATH CONTAINING, AS BTIGHTENING AGENT, BETWEEN ABOUT 0.1 G./1. AND ABOUT 10.0 G/1. OF THE REACTION PRODUCT OBTAINED BY REACTING IN AN AQUEOUS MEDIUM AT A TEMPERATURE BETWEEN ABOUT 20* AND 50*C. A. A POLYALKYLENE IMINE SELECTED FROM THE GROUP CONSISTING OF POLYETHYLENE IMINE AND POLUPROPYLENE IMINE, WITH B. AN AROMATIC ALDEHYDE, IN A MOLAR RATIO BETWEEN ABOUT 1:1 TO 1:50 OF IMINE TO ALDEHYDE, ADDING C. A BASIC AGENT SELECTED FROM THE GROUP CONSISTING OF AMMONIA, ETHYLENE DIAMINE, AND DIETHYLENE TRIAMINE, AND D. EPICHLOROHYDRIN, IN A MOLAR RATIO BETWEEN ABOUT 1:3 TO 1:40 OF IMINE TO EPICHLOROHYDRIN AND ABOUT 1:1 OF BASIC AGENT TO EPICHLOROHYDRIN, AND HEATING THE REACTION MIXTURE.
Claim 3
Dependent Claim
32 words
The zinc electroplating bath of claim 1 additionally containing a salt of a metal selected from the group consisting of a metal of the Groups VIIB and VIII of the Periodic System.
Claim 4
Dependent Claim
24 words
The alkaline zinc electropLating bath of claim 2, wherein said metal salt is present in an amount of between about 0.01 and 0.1 g./l.
Claim 5
Dependent Claim
13 words
The zinc electroplating bath of claim 1 additionally containing a mono- or polysaccharide.
Claim 6
Dependent Claim
25 words
The alkaline zinc electroplating bath of claim 3, wherein said mono- or poly-saccharide is present in an amount of between about 0.01 and 0.08 g./l.
Claim 7
Dependent Claim
36 words
THE ZINC ELECTROPLATING BATH OF CLAIM 1 ADDITIONALLY CONTAINING A SALT OF A METAL SELECTED FROM THE GROUP CONSISTING OF A METAL OF THE GROUPS VIIB AND VIII OD THE PERIODIC SYSTEM AND A MONO-OR POLYSACCHARIDE.
Claim 8
Dependent Claim
40 words
The alkaline zinc electroplating bath of claim 6, wherein said metal salt is present in an amount of between about 0.01 and 0.1 g./l. and said mono- or poly-saccharide is present in an amount between about 0.01 and 0.08 g./l.
Claim 9
Dependent Claim
41 words
The zinc electroplating bath of claim 1, in which the aromatic aldehyde component of the reaction product is an aromatic aldehyde selected from the group consisting of benzaldehyde, a halogen-substituted benzaldehyde, a hydroxyl-substituted benzaldehyde, and an aromatic aldehyde of the formula
Claim 10
Dependent Claim
68 words
The alkaline zinc electroplating bath of claim 1, in which said bath contains, as brightening agent, between about 0.2 g./l. and about 5.0 g./l of the reaction product of a. a polyalkylene imine selected from the group consisting of polyethylene imine and polypropylene imine, with b. an aromatic aldehyde, c. a basic agent selected from the group consisting of ammonia, ethylene diamine, and diethylene triamine, and d. epichlorohydrin.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |