US3933531A
Expired / Lapsed
US
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Method of rust-preventing for copper and copper alloy
Assignee: Shikoku Chemicals Corp
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Filing: 1974-06-24
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Granted: 1976-01-20
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Expires: 1994-06-24
Abstract
Abstract Copper and copper alloys are prevented from rust by surface-treating the copper and copper alloys with at least one compound selected from the class consisting of alkylimidazoles represented by the following formula:
Inventors
- 👤 Natsuo Sawa
- 👤 Masahiro Hoda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:07
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/14; C23F11/149; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
98 words
A method for preventing discoloration of copper or copper alloy, subsequently exposed to a gaseous atmosphere containing sulfur compounds, which method comprises surface-treating the copper or copper alloy with at least one compound selected from the group consisting of alkylimidazoles represented by the general formula: ##SPC3## wherein R is a long straight chain alkyl group having 5-21 carbon atoms and R' is a hydrogen atom or a lower alkyl group, and acid addition salts of said alkylimidazoles thereby to coat said surface with micelles of said alkylimidazoles which act to prevent discoloration of said copper or copper alloy.
Claim 2
Independent Claim
98 words
A method for preventing discoloration of copper or copper alloy, subsequently exposed to a gaseous atmosphere containing sulfur compounds, which method comprises surface-treating the copper or copper alloy with at least one compound selected from the group consisting of alkylimidazoles represented by the general formula: ##SPC3## wherein R is a long straight chain alkyl group having 5-21 carbon atoms and R' is a hydrogen atom or a lower alkyl group, and acid addition salts of said alkylimidazoles thereby to coat said surface with micelles of said alkylimidazoles which act to prevent discoloration of said copper or copper alloy.
Claim 3
Dependent Claim
41 words
A method according to claim 1, wherein the surface treatment is carried out by dipping the copper or copper alloy in a solution containing at least one compound selected from the group consisting of said alkylimidazoles and their acid addition salts.
Claim 4
Dependent Claim
41 words
A method according to claim 1, wherein the surface treatment is carried out by coating the copper or copper alloy with a solution containing at least one compound selected from the group consisting of said alkylimidazoles and their acid addition salts.
Claim 5
Dependent Claim
41 words
A method according to claim 1, wherein the surface treatment is carried out by spraying a solution containing at least one compound selected from the group consisting of the alkylimidazoles and their acid addition salts onto said copper or copper alloy.
Claim 6
Dependent Claim
50 words
A method according to claim 1, wherein the surface treatment is carried out with use of a solution containing an amine in addition to at least one compound selected from the group consisting of said alkylimidazoles and their acid addition salts, in a concentration of at least 0.01% by weight.
Claim 7
Dependent Claim
46 words
A method according to claim 1, wherein the surface treatment is carried out with use of a solution containing at least one of compound selected from the group consisting of said alkylimidazoles and their acid addition salts, in a concentration of at least 0.01% by weight.
Claim 8
Dependent Claim
26 words
A method according to claim 1, wherein the surface treatment is carried out with the use of said a solution of alkylimidazoles in an organic solvent.
Claim 9
Dependent Claim
27 words
A method according to claim 1, wherein the surface treatment is carried out with use of a solution of acid addition salts of said alkylimidazoles in water.
Claim 10
Dependent Claim
35 words
A method according to claim 1, wherein the surface treatment is carried out with use of a solution of alkylimidazoles or their acid addition salts in a mixed medium of water and an organic solvent.
Claim 11
Dependent Claim
29 words
A method according to claim 1, wherein the surface treatment is carried out with use of a solution of said alkylimidazoles added with a solution of an acidic substance.
Claim 12
Dependent Claim
39 words
A method according to claim 10, wherein the solution contains at least one of the compound selected from the group consisting of said alkylimidazoles and their acid addition salts, in a concentration ranging from 0.05 to 5% by weight.
Claim 13
Dependent Claim
17 words
A method according to claim 1, wherein the compound is 2-undecylimidazole or an acid addition salt thereof.
Claim 14
Dependent Claim
17 words
A method according to claim 1, wherein the compound is 2-undecyl-4-methylimidazole or an acid addition salt thereof.
Claim 15
Dependent Claim
17 words
A method according to claim 1, wherein the compound is 2-heptadecylimidazole or an acid addition salt thereof.
Claim 16
Dependent Claim
17 words
A method according to claim 1, wherein the compound is 2-heptadecyl-4-methylimidazole or an acid addition salt thereof.
Claim 17
Dependent Claim
73 words
Copper or copper alloy which is resistant to discoloration when exposed to a gaseous atmosphere containing sulfur compounds and whose surface has been treated with at least one compound selected from the group consisting of alkylimidazoles represented by the general formula ##SPC4## wherein R is a long straight chain alkyl group having 5-21 carbon atoms and R' is a hydrogen atom or a lower alkyl group, and acid addition salts of said alkylimidazoles.
Claim 18
Dependent Claim
73 words
Copper or copper alloy which is resistant to discoloration when exposed to a gaseous atmosphere containing sulfur compounds and whose surface has been treated with at least one compound selected from the group consisting of alkylimidazoles represented by the general formula ##SPC4## wherein R is a long straight chain alkyl group having 5-21 carbon atoms and R' is a hydrogen atom or a lower alkyl group, and acid addition salts of said alkylimidazoles.
Claim 19
Dependent Claim
19 words
Copper or copper alloy according to claim 16, wherein the compound is 2-undecylimidazole or an acid addition salt thereof.
Claim 20
Dependent Claim
19 words
Copper or copper alloy according to claim 16, wherein the compound is 2-undecyl-4-methylimidazole or an acid addition salt thereof.
Claim 21
Dependent Claim
19 words
Copper or copper alloy according to claim 16, wherein the compound is 2-heptadecylimidazole or an acid addition salt thereof.
Claim 22
Dependent Claim
19 words
Copper or copper alloy according to claim 16, wherein the compound is 2-heptadecyl-4-methylimidazole or an acid addition salt thereof.
Claim 23
Independent Claim
103 words
A method for producing copper or copper alloy which is resistant to discoloration when subsequently exposed to a gaseous atmosphere containing sulfur compounds which method comprises treating the surface of said copper alloy with at least one compound selected from the group consisting of alkylimidazoles represented by the general formula: ##SPC5## wherein R is a long straight chain alkyl group having 5-21 carbon atoms and R' is a hydrogen atom or a lower alkyl group, and acid addition salts of said alkylimidazoles thereby to coat said surface with micelles of said alkylimidazoles which act to prevent discoloration of said copper or copper alloy.
Claim 24
Independent Claim
103 words
A method for producing copper or copper alloy which is resistant to discoloration when subsequently exposed to a gaseous atmosphere containing sulfur compounds which method comprises treating the surface of said copper alloy with at least one compound selected from the group consisting of alkylimidazoles represented by the general formula: ##SPC5## wherein R is a long straight chain alkyl group having 5-21 carbon atoms and R' is a hydrogen atom or a lower alkyl group, and acid addition salts of said alkylimidazoles thereby to coat said surface with micelles of said alkylimidazoles which act to prevent discoloration of said copper or copper alloy.
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) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |