US3769184A
Expired / Lapsed
US
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Acid zinc electroplating
Assignee: EIDP Inc
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Filing: 1972-05-23
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Granted: 1973-10-30
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Expires: 1992-05-23
Abstract
Abstract R'''' is an alkyl group of one to four carbon atoms; and X is a halide ion; and B. A WATER-SOLUBLE CONDENSATION PRODUCT OF A BENZENE OR NAPHTHALENE SULFONIC ACID, OR SALT THEREOF, WITH FORMALDEHYDE, SAID CONDENSATION PRODUCT CONTAINING AT LEAST 2 BENZENE OR NAPHTHALENE SULFONIC ACID GROUPS CONNECTED WITH EACH OTHER BY METHYLENE BRIDGES. WHEREIN R is -CONH2, -CN, -CHO or -COOR''''; R'' is an alkyl group of one to four carbon atoms, -CH2CH CH2, CH2O*CH, -CH2CH CHCH2X, -CH2COOR'''' or Acid zinc electroplating baths at pH 3.5 to 7.5 are provided which have dissolved therein as additives A. A PYRIDINIUM COMPOUND OF THE GENERAL FORMULA:
Inventors
- 👤 J Rushmere
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:19
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/22
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
44 words
The acid electroplating bath of claim 1 wherein the pyridinium compound is present in an amount in the range of about 0.02 to 20 grams per liter and the condensation product is present in an amount of about 0.5 to 50 grams per liter.
Claim 2
Dependent Claim
57 words
The acid electroplating bath of claim 2 wherein the pyridinium compound is selected from the group consisting of 1-allyl, 3-carboxamido pyridinium halide; 1-methyl, 3-carboxamido pyridinium halide; 1-propargyl, 3-carboxamido pyridinium halide; 1-(4-chlorobutene-2), 3-carboxamido pyridinium halide; 2-butene 1,4 bis (3-carboxamido pyridinium halide); 1-carbomethoxymethyl, 3-carboxamido pyridinium halide; 1-propargyl, 3-carbomethoxy pyridinium halide; 1-allyl, 3-cyano pyridinium halide and 1-allyl, 3-formyl pyridinium halide.
Claim 3
Dependent Claim
22 words
The acid electroplating bath of claim 3 wherein the pH of the bath is within the range of about 5 to 6.
Claim 4
Dependent Claim
47 words
The acid electroplating bath of claim 4 wherein the pyridinium compound is present in an amount in the range of about 0.05 to 5 grams per liter and the condensation product is present in an amount in the range of about 1 to 20 grams per liter.
Claim 5
Dependent Claim
29 words
The acid electroplating bath of claim 5 wherein the pyridinium compound is 1-allyl 3-carboxamido pyridinium halide and the sulfonic acid used in the condensation product is naphthalene sulfonic acid.
Claim 6
Dependent Claim
52 words
The acid electroplating bath of claim 4 wherein the bath is an aqueous acid zinc chloride bath having zinc ions at a concentration in the range of about 6 to 45 grams per liter and having a chloride ion to zinc ion weight ratio in the range of about 4/1 to 16/1.
Claim 7
Dependent Claim
121 words
An aqueous acid zinc chloride electroplating bath comprising an aqueous solution of zinc ions at a concentration in the range of about 6 to 20 grams per liter and having a chloride ion to zinc ion weight ratio within the range of about 6/1 to 12/1, said solution maintained at a pH of about 5 to 6 and having dissolved therein (a) about 0.05 to 5 grams per liter of 1-allyl, 3-carboxamido pyridinium halide wherein the halide is chloride, bromide or iodide, and (b) about 1 to 20 grams per liter of a water-soluble condensation product of a naphthalene sulfonic acid with formaldehyde, said Condensation product containing at least two naphthalene sulfonic acid groups connected with each other by methylene bridges.
Claim 8
Dependent Claim
57 words
In a process of electroplating bright zinc from an aqueous acid zinc electroplating bath having zinc ions dissolved therein the improvement comprising: maintaining the bath at a pH in the range of about 3.5 to 7.5 and adding thereto in an amount effective to give a bright zinc deposit (a) a pyridinium compound of the general formula:
Claim 9
Dependent Claim
49 words
The process of claim 9 wherein the pyridinium compound is added to give a bath concentration in the range of about 0.02 to 20 grams per liter and the condensation product is added to give a bath concentration in the range of about 0.5 to 50 grams per liter.
Claim 10
Dependent Claim
55 words
The process of claim 10 wherein the pyridinium compound is selected from the group consisting of 1-allyl, 3-carboxamido pyridinium halide; 1-methyl, 3-carboxamido pyridinium halide; 1-propargyl, 3-carboxamido pyridinium halide; 1-(4-chlorobutene-2), 3-carboxamido pyridinium halide; 2-butene 1,4 bis (3-carboxamido pyridinium halide); 1-carbomethoxymethyl, 3-carboxamido pyridinium halide; 1-propargyl, 3-carbomethoxy pyridinium halide; 1-allyl, 3-cyano pyridinium halide and 1-allyl, 3-formyl pyridinium halide.
Claim 11
Dependent Claim
61 words
The process of claim 11 wherein the pH of the bath is within the range of about 5 to 6, the pyridinium compound is added to give a concentration in the range of about 0.05 to 5 grams per liter and the condensation product is added to give a concentration in the range of about 1 to 20 grams per liter.
Claim 12
Dependent Claim
21 words
The process of claim 12 wherein the bath is operated at a temperature in the range of about 10* to 45*C.
Claim 13
Dependent Claim
50 words
The process of claim 12 wherein the bath is an aqueous acid zinc chloride bath having zinc ions at a concentration in the range of about 6 to 45 grams per liter and having a chloride ion to zinc ion weight ratio in the range of about 4/1 to 16/1.
Claim 14
Dependent Claim
143 words
In a process of electroplating bright zinc from an aqueous acid zinc chloride electroplating bath containing zinc ions dissolved therein at a concentration in the range of about 6 to 20 grams per liter and having a chloride ion to zinc ion weight ratio within the range of about 6/1 to 12/1, the improvement comprising: maintaining the bath at a pH in the range of about 5 to 6 and the temperature in the range of about 20* to 30*C. and adding thereto (a) about 0.05 to 5 grams per liter of 1-allyl, 3-carboxamido pyridinium halide wherein the halide is chloride, bromide or iodide, and (b) about 1 to 20 grams per liter of a water-soluble condensation product of a naphthalene sulfonic acid with formaldehyde, said condensation product containing at least two naphthalene sulfonic acid groups connected with each other by methylene bridges.
References Cited (Backward Citations)
US3318787A
Cited
US3411996A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |