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US4014850A
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US
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Friction elements containing novel friction particles
Assignee: Occidental Chemical Corp
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Filing: 1975-06-23
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Granted: 1977-03-29
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Expires: 1995-06-23
Abstract
Abstract A friction element which has good friction stability and good braking fade resistance contains friction particles which are insoluble, infusible, and have narrow size range, and are prepared from a crosslinked thermosettable resin in liquid suspension. Also disclosed is a friction particle prepared according to the above process or according to a conventional process.
Inventors
- 👤 Donald H. Thorpe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:43
CPC Classifications
F; F16; F16D; F16D69/00; F16D69/02; F16D69/021; F16D69/022; C; C08; C08K; C08K7/00; C08K7/02; C08K7/04; C08L; C08L67/00; C08L67/06; C08L91/00; C08L91/005
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
62 words
In a friction element which comprises a filamentous friction material, a thermosettable resin friction binder, and a friction particle, the improvement wherein the friction particle is a particulate product prepared by polymerizing a cashew nut shell oil suspended in a liquid medium to form a resin and crosslinking the suspended resin with a crosslinking agent in the presence of a suspension stabilizer.
Claim 2
Dependent Claim
62 words
In a friction element which comprises a filamentous friction material, a thermosettable resin friction binder, and a friction particle, the improvement wherein the friction particle is a particulate product prepared by polymerizing a cashew nut shell oil suspended in a liquid medium to form a resin and crosslinking the suspended resin with a crosslinking agent in the presence of a suspension stabilizer.
Claim 3
Dependent Claim
20 words
The element of claim 1 wherein crosslinking of the friction particle takes place in the presence of a polymerization catalyst.
Claim 4
Dependent Claim
17 words
The element of claim 1 wherein a wetting agent is used in conjunction with the suspension stabilizer.
Claim 5
Dependent Claim
23 words
The element of claim 3 wherein the wetting agent is selected from the group consisting of sodium alkylbenzene sulfonates and dioctyl sodium sulfosuccinate.
Claim 6
Dependent Claim
28 words
The element of claim 2 wherein the polymerization catalyst is selected from the group consisting of benzoyl peroxide, lauroyl peroxide, tert-butyl perbenzoate, tert-butylperoctoate, 2,5-dimethyl-2,5-bis(2-ethyl hexanoyl peroxy)hexane, and 2,2'-azobisisobutyronitrile.
Claim 7
Dependent Claim
36 words
The element of claim 1 wherein the suspension stabilizer is selected from the group consisting of methylcellulose, hydroxyethylcellulose, hydroxypropylmethylcellulose, styrene-maleic copolymers, polyacrylic acids, methacrylic acids, methylvinyl ether-maleic copolymers, polyvinyl pyrrolidone, and polyvinyl alcohol, and mixtures thereof.
Claim 8
Dependent Claim
19 words
The element of claim 6 wherein the suspension stabilizer is present from about 0.05 to about 1 weight percent.
Claim 9
Dependent Claim
28 words
The element of claim 1 wherein the suspension stabilizer is a phosphate of an alkaline earth metal in an amount of about 1 to about 5 weight percent.
Claim 10
Dependent Claim
12 words
The element of claim 8 wherein the suspension stabilizer is tricalcium phosphate.
Claim 11
Dependent Claim
15 words
The element of claim 2 wherein the catalyst is a strong mineral acid or diethylsulfate.
Claim 12
Dependent Claim
13 words
The element of claim 1 wherein the crosslinking agent is a methylene donor.
Claim 13
Dependent Claim
22 words
The element of claim 1 wherein the liquid medium is a material selected from a group consisting of water, glycols and alcohols.
Claim 14
Dependent Claim
22 words
The element of claim 11 wherein the methylene donor is a material selected from the group consisting of formaldehyde, hexamethylenetetramine and paraformaldehyde.
Claim 15
Dependent Claim
11 words
The element of claim 12 wherein the liquid medium is water.
Claim 16
Dependent Claim
11 words
The element of claim 13 wherein the methylene donor is formaldehyde.
References Cited (Backward Citations)
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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) | 1980-03-28 | 1980-09-27 | 1981-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-28 | 1984-09-27 | 1985-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-28 | 1988-09-27 | 1989-03-29 | $7700.00 | Window Closed / Lapsed |