US4243771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nitrile rubber adhesion
Assignee: United States Department of the Navy
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Filing: 1979-11-19
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Granted: 1981-01-06
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Expires: 1999-11-19
Abstract
Abstract This invention discloses a method for converting a nitrile rubber substrate surface to a chemically active surface whereupon said surface reacts with an adhesive to form a permanent bond with said adhesive. The nitrile rubber substrate surface is so converted by treatment with a dilute mineral acid.
Inventors
- 👤 Martin H. Kaufman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:03
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/14; C08J2309/00; C08J2309/02
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
50 words
A method for converting a dilute nitrile rubber substrate surface into a bondable surface for metals, wood, and rubbers which comprises hydrolyzing said nitrile substrate surface in the presence of a mineral acid under such mild conditions that said hydrolyzing does not affect the unsaturation of said nitrile substrate surface.
Claim 2
Independent Claim
50 words
A method for converting a dilute nitrile rubber substrate surface into a bondable surface for metals, wood, and rubbers which comprises hydrolyzing said nitrile substrate surface in the presence of a mineral acid under such mild conditions that said hydrolyzing does not affect the unsaturation of said nitrile substrate surface.
Claim 3
Dependent Claim
22 words
A method as in claim 1 wherein said mineral acid is selected from the group consisting of hydrochloric, sulfuric, and phosphoric acids.
Claim 4
Dependent Claim
38 words
A method as in claim 2 wherein said hydrolyzing conditions comprise the mineral acid is a dilute mineral acid, the time of treatment of said nitrile rubber substrate surface is from about 0.25 minute to about 45 minutes.
Claim 5
Dependent Claim
19 words
A method as in claim 3 wherein said mineral acid is from about 0.03 to about 15 percent acid.
Claim 6
Dependent Claim
31 words
A method as in claim 4 wherein said hydrolyzing conditions are further characterized by converting the --CN groups on the nitrile rubber substrate surface to carboxyl groups without forming subsequent reactions.
Claim 7
Dependent Claim
19 words
A method as in claim 1 wherein said surface is cleaned with an organic solvent prior to being hydrolyzed.
Claim 8
Dependent Claim
21 words
A method as in claim 6 wherein said surface cleaning is carried out in the presence of a surfactant and water.
Claim 9
Dependent Claim
22 words
A method as in claim 7 wherein said surfactant is present in an amount of from about 0.1% to about l 2.0%.
Claim 10
Independent Claim
58 words
A method for converting a nitrile rubber substrate surface into a bondable surface for metals, wood, and rubbers which comprises cleaning said surface with an organic solvent, and hydrolyzing said nitrile substrate surface in the presence of a dilute mineral acid under such mild conditions that said hydrolyzing does not affect the unsaturation of said nitrile substrate surface.
Claim 11
Independent Claim
58 words
A method for converting a nitrile rubber substrate surface into a bondable surface for metals, wood, and rubbers which comprises cleaning said surface with an organic solvent, and hydrolyzing said nitrile substrate surface in the presence of a dilute mineral acid under such mild conditions that said hydrolyzing does not affect the unsaturation of said nitrile substrate surface.
Claim 12
Dependent Claim
22 words
A method as in claim 9 wherein said mineral acid is selected from the group consisting of hydrochloric, sulfuric, and phosphoric acids.
Claim 13
Dependent Claim
38 words
A method as in claim 10 wherein said hydrolyzing conditions comprise the mineral acid is a dilute mineral acid, the time of treatment of said nitrile rubber substrate surface is from about 0.25 minute to about 45 minutes.
Claim 14
Dependent Claim
19 words
A method as in claim 11 wherein said mineral acid is from about 0.03 to about 15 percent acid.
Claim 15
Dependent Claim
31 words
A method as in claim 12 wherein said hydrolyzing conditions are further characterized by converting the --CN groups on the nitrile rubber substrate surface to carboxyl groups without forming subsequent reactions.
Claim 16
Dependent Claim
21 words
A method as in claim 9 wherein said surface cleaning is carried out in the presence of a surfactant and water.
Claim 17
Dependent Claim
21 words
A method as in claim 14 wherein said surfactant is present in an amount of from about 0.1% to about 2.0%.
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) | 1984-01-06 | 1984-07-07 | 1985-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-06 | 1988-07-07 | 1989-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-06 | 1992-07-07 | 1993-01-06 | $7700.00 | Window Closed / Lapsed |