US4036668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bonding fluoroelastomers to metal
Assignee: Caterpillar Inc
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Filing: 1975-03-17
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Granted: 1977-07-19
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Expires: 1995-03-17
Abstract
Abstract Fluoroelastomers, including ultra high temperature, thermally stable fluoroelastomers, are bonded to a metal backing member by (a) compounding the fluoroelastomers with CaO, (b) curing the fluoroelastomers in contact with a pretreated surface of the metal member, and (c) postcuring the fluoroelastomers/metal unit at elevated temperatures.
Inventors
- 👤 William D. Brandon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:58
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/12; F; F16; F16D; F16D69/00; F16D69/04; C08J2327/00; C08J2327/02; C08J2327/12; F16D2069/005; F16D2069/007; F16D2069/0425; F16D2069/045; F16D2069/0466; F16D2069/0475; F16D2069/0491
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
144 words
A method of bonding fluoroelastomers directly to metal without the use of a bonding agent between the fluoroelastomers and the metal while simultaneously curing the fluoroelastomers comprising pretreating a metal member by roughening a bonding surface thereof and then oxidizing the roughened bonding surface under oxidation conditions so controlled as to form an adherent oxide thereon; pressing a fluoroelastomer compounded with a minor amount of CaO evenly dispersed therethroughout directly to the adhered oxide covered bonding surface of the pretreated metal member without the use of a bonding agent other than said adherent oxide between said fluoroelastomer and said bonding surface; curing the fluoroelastomer-CaO dispersion at an elevated temperature in direct pressed contact with the adherent oxide covered bonding surface of the metal member and simultaneously forming a bond with said adhered oxide covered surface; and postcuring the resultant product to strengthen the bond.
Claim 2
Independent Claim
144 words
A method of bonding fluoroelastomers directly to metal without the use of a bonding agent between the fluoroelastomers and the metal while simultaneously curing the fluoroelastomers comprising pretreating a metal member by roughening a bonding surface thereof and then oxidizing the roughened bonding surface under oxidation conditions so controlled as to form an adherent oxide thereon; pressing a fluoroelastomer compounded with a minor amount of CaO evenly dispersed therethroughout directly to the adhered oxide covered bonding surface of the pretreated metal member without the use of a bonding agent other than said adherent oxide between said fluoroelastomer and said bonding surface; curing the fluoroelastomer-CaO dispersion at an elevated temperature in direct pressed contact with the adherent oxide covered bonding surface of the metal member and simultaneously forming a bond with said adhered oxide covered surface; and postcuring the resultant product to strengthen the bond.
Claim 3
Dependent Claim
84 words
A method as in claim 1, wherein the fluoroelastomer is compounded with from about 3 to about 15 parts CaO per 100 parts fluoroelastomer; the fluoroelastomer is in pressed contact with the metal bonding surface under pressures from about 250 to about 1500 psi of bonding surface; and the cured product is postcured for a time which falls within the range from about 1 to about 20 hours at a temperature which falls within the range from about 350° F. to about 500° F.
Claim 4
Dependent Claim
29 words
A method as in claim 2, wherein the metal member is steel the oxide comprises a ferrous oxide and the fluoroelastomer is a copolymer of hexafluoropropylene and polyvinylidene fluoride.
Claim 5
Dependent Claim
28 words
A method as in claim 2, wherein the cured product is postcured at a temperature which falls within the range from about 400° F. to about 500° F.
Claim 6
Dependent Claim
136 words
A method as in claim 1, wherein the fluoroelastomer is an ultra high temperature, thermally stable fluoroelastomer; the fluoroelastomer is compounded with from about 3 to about 15 parts of CaO per 100 parts fluoroelastomer; the fluoroelastomer is in pressed contact with the bonding surface under pressures from about 250 to about 1500 psi of bonding surface; the fluoroelastomer is cured and bonded to said bonding surface at a temperature which falls within the range from about 325° to about 390° F. for a period of time which falls within the range from about 20 minutes to about 30 seconds; and the resultant product is postcured at a temperature which falls within the range from about 350° to about 500° F. for a time which falls within the range from about 1 to about 20 hours.
Claim 7
Dependent Claim
29 words
A method as in claim 5, wherein the metal member is steel, the oxide comprises a ferrous oxide and the fluoroelastomer is a copolymer of hexafluoropropylene and polyvinylidene fluoride.
Claim 8
Dependent Claim
26 words
A method as in claim 6, wherein the product is postcured at a temperature which falls within the range from about 400° to about 500° F.
Claim 9
Dependent Claim
26 words
A method as in claim 7, wherein the fluoroelastomer is compounded with from about 3 parts to about 7 parts of CaO per 100 parts fluoroelastomer.
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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) | 1980-07-18 | 1981-01-17 | 1981-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-18 | 1985-01-17 | 1985-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-18 | 1989-01-17 | 1989-07-19 | $7700.00 | Window Closed / Lapsed |