US4045402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluoroelastomer-polyacrylate based friction material
Assignee: Caterpillar Inc
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Filing: 1975-08-01
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Granted: 1977-08-30
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Expires: 1995-08-01
Abstract
Abstract High modulus asperities are incorporated into a fluoroelastomer-polyacrylate elastomer matrix to provide a material which, when cured, exhibits high, stable coefficients of friction over a wide temperature range.
Inventors
- 👤 Roger O. Bjerk
- 👤 William D. Brandon
- 👤 Frederick S. Engelking
- 👤 John P. Jero
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:33
CPC Classifications
F; F16; F16D; F16D69/00; F16D69/02; F16D69/025; C; C08; C08K; C08K3/00; C08K3/01; C08K3/013; C08L; C08L27/00; C08L27/02; C08L27/12; C08L33/00; C08L33/04; C08L33/06; C08L33/08; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/252; Y10T428/31504; Y10T428/3154; Y10T428/31678; Y10T428/31692; Y10T428/31699
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
131 words
As an article of manufacture a friction material formed of 20 to 60% by weight of a matrix comprising a fluoroelastomer intimately intermixed with a polyacrylate elastomer in a weight ratio of fluoroelastomer to polyacrylate which falls within the range from about 11:1 to about 1:11, at least 5% by weight of said 20 to 60% by weight total matrix being said fluoroelastomer, from about 12 to about 40% by weight of carbon black; and from about 20 to about 60% by weight of glassy or ceramic asperite particles of from about 0.0001 to about 0.005 inch in effective diameter intermixed with and dispersed throughout said friction material in mechanically held nonbonded relation to provide a friction surface of said article of manufacture including the said matrix and said ceramic particles.
Claim 2
Dependent Claim
131 words
As an article of manufacture a friction material formed of 20 to 60% by weight of a matrix comprising a fluoroelastomer intimately intermixed with a polyacrylate elastomer in a weight ratio of fluoroelastomer to polyacrylate which falls within the range from about 11:1 to about 1:11, at least 5% by weight of said 20 to 60% by weight total matrix being said fluoroelastomer, from about 12 to about 40% by weight of carbon black; and from about 20 to about 60% by weight of glassy or ceramic asperite particles of from about 0.0001 to about 0.005 inch in effective diameter intermixed with and dispersed throughout said friction material in mechanically held nonbonded relation to provide a friction surface of said article of manufacture including the said matrix and said ceramic particles.
Claim 3
Dependent Claim
51 words
A friction material as in claim 1, wherein said fluoroelastomer comprises a copolymer of hexafluoropropylene and vinylidene fluoride and said polyacrylate elastomer has a repeating structural formula -- CH 2 -- CH (COOR) -- where R is hydrogen or a low molecular weight alkyl group having one to six carbon atoms.
Claim 4
Dependent Claim
25 words
A friction material as in claim 2, wherein the weight ratio of fluoroelastomer to polyacrylate falls within the range from about 5:1 to about 1:5.
Claim 5
Dependent Claim
136 words
A friction material composition comprising 20 to 60% by weight of a matrix consisting essentially of a copolymer of hexafluoropropylene and vinylidene fluoride intimately intermixed with a polyacrylate elastomer in a weight ratio of fluoroelastomer to polyacrylate which falls within the range from about 11:1 to about 1:11, at least 5% by weight of said 20 to 60% by weight total matrix being said fluoroelastomer, from about 12 to about 40 % by weight of carbon black; and from about 20 to about 60% by weight of glassy or ceramic asperite particles having a minimum size of 0.0001 inch which are dispersed throughout the matrix in mechanically held nonbonded relation and assuring a relatively high surface concentration of the asperite particles to provide a friction surface of said friction material including said matrix and said particles.
Claim 6
Dependent Claim
136 words
A friction material composition comprising 20 to 60% by weight of a matrix consisting essentially of a copolymer of hexafluoropropylene and vinylidene fluoride intimately intermixed with a polyacrylate elastomer in a weight ratio of fluoroelastomer to polyacrylate which falls within the range from about 11:1 to about 1:11, at least 5% by weight of said 20 to 60% by weight total matrix being said fluoroelastomer, from about 12 to about 40 % by weight of carbon black; and from about 20 to about 60% by weight of glassy or ceramic asperite particles having a minimum size of 0.0001 inch which are dispersed throughout the matrix in mechanically held nonbonded relation and assuring a relatively high surface concentration of the asperite particles to provide a friction surface of said friction material including said matrix and said particles.
Claim 7
Dependent Claim
40 words
A friction material composition as in claim 4 wherein said asperite particles are glass fibers of a size from about 0.0001 to about 0.005 inch in diameter and having a length to diameter ratio of from about 3 to 10,000.
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) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |