US4229267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkaline bright zinc plating and additive therefor
Assignee: MacDermid Inc
•
Filing: 1979-06-01
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Granted: 1980-10-21
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Expires: 1999-06-01
Abstract
Abstract An alkaline, electroplating bath for bright zinc plating comprising a source of zinc ions and a bath soluble polymer containing repeating tertiaryaminoalkyl acrylamide groups or quaternary salts thereof. The bath is capable of producing bright, fine grained zinc deposits over a broad current density range both in the presence and absence of cyanides.
Inventors
- 👤 Carl Steinecker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:49
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/22; C25D3/24
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
32 words
A bright zinc electroplating bath comprising an aqueous alkaline solution which includes a source of zinc ions and a bath soluble polymer containing repeating tertiaryaminoalkyl acrylamide groups or a quaternary salt thereof.
Claim 2
Dependent Claim
32 words
A bright zinc electroplating bath comprising an aqueous alkaline solution which includes a source of zinc ions and a bath soluble polymer containing repeating tertiaryaminoalkyl acrylamide groups or a quaternary salt thereof.
Claim 3
Dependent Claim
64 words
The bath of claim 1 wherein the bath soluble polymer has the following structural formula: ##STR9## wherein R 1 is H or methyl; n is an integer from 2 to 6; R 2 and R 3 are alike or different and are lower alkyl groups containing 1 to 4 carbon atoms; and, n 1 is an integer of from about 3 to about 20.
Claim 4
Dependent Claim
70 words
The bath of claim 1 wherein the bath soluble polymer has the following structural formula: ##STR10## wherein R 1 is H or methyl, n is an integer from 2 to 6; R 2 , R 3 and R 4 are alike or different and are lower alkyl groups containing 1 to 4 carbon atoms; n 1 is an integer of from about 3 to about 20; and A is halogen.
Claim 5
Dependent Claim
28 words
The bath of claim 3 wherein R 1 , R 2 , R 3 and R 4 are each methyl, n is 3 and n 1 about 10.
Claim 6
Dependent Claim
25 words
The bath of claim 1 wherein said bath soluble polymer is present in an amount of from about 0.05 to about 1.0 grams per liter.
Claim 7
Dependent Claim
25 words
The bath of claim 1 wherein said bath soluble polymer is present in an amount of from about 0.1 to about 0.2 grams per liter.
Claim 8
Dependent Claim
14 words
The bath of claim 1 wherein said bath contains a source of cyanide ions.
Claim 9
Dependent Claim
13 words
The bath of claim 1 wherein said bath is free of cyanide ions.
Claim 10
Dependent Claim
11 words
The bath of claim 1 wherein said bath contains a polyethylenepolyamine.
Claim 11
Dependent Claim
18 words
The bath of claim 9 wherein said polyethylenepolyamine is formed by the reaction of ammonia and ethylene dichloride.
Claim 12
Dependent Claim
23 words
The bath of claim 9 wherein said polyethylenepolyamine is present in an amount of from about 0.25 to about 5 grams per liter.
Claim 13
Dependent Claim
23 words
The bath of claim 9 wherein said polyethylenepolyamine is present in an amount of from about 0.3 to about 0.75 grams per liter.
Claim 14
Dependent Claim
24 words
The bath of claim 1 wherein said bath contains the condensate of a heterocyclic compound and an epihalohydrin or quaternary salt of such condensate.
Claim 15
Dependent Claim
59 words
The bath of claim 13 wherein the mol ratio of heterocyclic compound to epihalohydrin ranges from about 2:1 to 1:2, said condensate has a molecular weight of from about 400 to about 9,000, and said heterocyclic compound is a pyridine substituted in the 3 or 4 position with a radical selected from the group consisting of carbamoyl and acylhydrazino.
Claim 16
Dependent Claim
15 words
The bath of claim 13 wherein said heterocyclic is nicotinamide and said epihalohydrin is epichlorohydrin.
Claim 17
Dependent Claim
27 words
The bath of claim 13 wherein said condensate or quaternary salt thereof is present in an amount of from about 0.05 to about 1.0 grams per liter.
Claim 18
Dependent Claim
27 words
The bath of claim 13 wherein said condensate or quaternary salt thereof is present in an amount of from about 0.1 to about 0.5 grams per liter.
Claim 19
Dependent Claim
16 words
A process for electroplating zinc which comprises effecting the electroplating within the bath of claim 1.
Claim 20
Dependent Claim
15 words
The process of claim 18 wherein the plating is effected free of any cyanide ions.
Claim 21
Dependent Claim
16 words
The process of claim 18 wherein the plating is effected in the presence of cyanide ions.
Claim 22
Dependent Claim
28 words
An aqueous concentrate for preparing the bath of claim 1 which concentrate includes a bath soluble polymer containing repeating tertiary amino acrylamide groups or a quaternary salt thereof.
Claim 23
Dependent Claim
11 words
The aqueous concentrate of claim 21 which also includes a polyethylenepolyamine.
Claim 24
Dependent Claim
24 words
The aqueous concentrate of claim 21 which also includes a condensate of a heterocyclic compound and an epihalohydrin or quaternary salt of such condensate.
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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) | 1983-10-21 | 1984-04-21 | 1984-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-21 | 1988-04-21 | 1988-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-21 | 1992-04-21 | 1992-10-21 | $7700.00 | Window Closed / Lapsed |