US4349403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for bonding elastomers to steel
Assignee: Lord Corp
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Filing: 1981-01-16
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Granted: 1982-09-14
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Expires: 2001-01-16
Abstract
Abstract Adhesion and environmental resistance of rubber-metal assemblies is significantly improved by the use of metal substrates which have been nitrided at least in the bond area and subsequently exposed to a non-reactive gas, such as argon, prior to applying the adhesive.
Inventors
- 👤 Donald R. Blenner
- 👤 Herman V. Boenig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:54
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/06; B05; B05D; B05D3/00; B05D3/14; B05D3/141; B05D3/142; B05D7/00; B05D7/14; B05D7/50; B05D7/52; B05D7/54; B05D7/542; B32B15/18; B32B37/00; B32B37/12; B32B7/00; B32B7/04; B32B7/12; C; C08; C08J; C08J5/00; C08J5/04; C08J5/06; B05D2530/00; B32B38/00; B32B2038/0052; B32B2038/0076; C08J2321/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
84 words
A method for improving environmental resistance of rubber-metal composite structures comprising: (a) treating in a plasma of at least one non-reactive gas at least one nitrided metal element; (b) applying to at least one plasma-treated surface of said nitrided metal element an adhesive composition suitable for bonding natural and synthetic rubbers to metal; (c) contacting such adhesively-coated surface of such elements with a vulcanizable natural or synthetic rubber; (d) subjecting the resultant assembly to conditions sufficient to vulcanize said rubber and cure said adhesive.
Claim 2
Independent Claim
84 words
A method for improving environmental resistance of rubber-metal composite structures comprising: (a) treating in a plasma of at least one non-reactive gas at least one nitrided metal element; (b) applying to at least one plasma-treated surface of said nitrided metal element an adhesive composition suitable for bonding natural and synthetic rubbers to metal; (c) contacting such adhesively-coated surface of such elements with a vulcanizable natural or synthetic rubber; (d) subjecting the resultant assembly to conditions sufficient to vulcanize said rubber and cure said adhesive.
Claim 3
Dependent Claim
24 words
A method according to claim 1 wherein said non-reactive gas is selected from the group consisting of helium, nitrogen, neon, argon, krypton and xenon.
Claim 4
Dependent Claim
13 words
A method according to claim 1 wherein said metal is a ferrous-based metal.
Claim 5
Dependent Claim
24 words
A method according to claim 3 wherein said non-reactive gas is selected from the group consisting of helium, nitrogen, neon, argon, krypton and xenon.
Claim 6
Dependent Claim
22 words
A method according to claim 4 wherein said ferrous-based metal is selected from the group consisting of iron and alloys of iron.
Claim 7
Dependent Claim
133 words
A method according to claim 1 for improving environmental resistance of rubber-metal composite structures comprising: (a) providing a nitrided metal substrate; (b) treating said nitrided substrate in a zone of electrical glow discharge plasma in a gaseous medium consisting essentially of at least one non-reactive gas, whereby at least a portion of at least one nitrided surface of such metal substrate is exposed to such plasma; (c) applying to at least a part of the plasma-treated portion of such metal substrate an adhesive composition suitable for bonding natural and synthetic rubber compositions to metal substrates; (d) contacting such adhesive-coated part of such metal substrate with a vulcanizable rubber composition; and (e) subjecting the resulting assembly to vulcanization conditions at a pressure, temperature and time sufficient to cure such adhesive and vulcanizable rubber composition.
Claim 8
Dependent Claim
24 words
A method according to claim 6 wherein said non-reactive gas is selected from the group consisting of helium, nitrogen, neon, argon, krypton and xenon.
Claim 9
Dependent Claim
13 words
A method according to claim 6 wherein said metal is a ferrous-based metal.
Claim 10
Dependent Claim
24 words
A method according to claim 8 wherein said non-reactive gas is selected from the group consisting of helium, nitrogen, neon, argon, krypton and xenon.
Claim 11
Dependent Claim
21 words
A method according to claim 9 wherein said ferrous-based metal is selected from the group consisting of iron and iron alloys.
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) | 1985-09-13 | 1986-03-15 | 1986-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-13 | 1990-03-15 | 1990-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-13 | 1994-03-15 | 1994-09-14 | $7700.00 | Window Closed / Lapsed |