Patent US4014828A successfully refreshed from Google Patents.
US4014828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermosettable friction particles for use in friction elements
Assignee: Occidental Chemical Corp
•
Filing: 1975-06-23
•
Granted: 1977-03-29
•
Expires: 1995-06-23
Abstract
Abstract An improved process for preparing a friction particle results when a thermosettable resin is crosslinked in liquid suspension, producing a friction particle which is insoluble, infusible, has good friction stability and good braking fade resistance, and has a narrow particle size range. Also disclosed is a novel polyester 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
2026-10-29 12:28
CPC Classifications
C; C08; C08F; C08F299/00; C08F299/02; C08F299/04; C08F299/0407; C08F299/0414; F; F16; F16D; F16D69/00; F16D69/02; F16D69/021; F16D69/022
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
63 words
A process for preparing improved friction particles for use in friction element compositions wherein said particles are infusible with like friction particles and undergo no substantial softening at elevated temperatures, said process comprising the steps of polymerizing a cashew nut shell oil suspended in a liquid medium to form a resin and crosslinking the suspended resin in the presence of a suspension stabilizer.
Claim 2
Dependent Claim
63 words
A process for preparing improved friction particles for use in friction element compositions wherein said particles are infusible with like friction particles and undergo no substantial softening at elevated temperatures, said process comprising the steps of polymerizing a cashew nut shell oil suspended in a liquid medium to form a resin and crosslinking the suspended resin in the presence of a suspension stabilizer.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein crosslinking takes place with a crosslinking agent.
Claim 4
Dependent Claim
16 words
The process of claim 2 wherein crosslinking takes place in the presence of a polymerization catalyst.
Claim 5
Dependent Claim
16 words
The process of claim 3 wherein the catalyst is a strong mineral acid or diethyl sulfate.
Claim 6
Dependent Claim
11 words
The process of claim 1 wherein the liquid medium is water.
Claim 7
Dependent Claim
17 words
The process of claim 1 wherein a wetting agent is used in conjunction with the suspension stabilizer.
Claim 8
Dependent Claim
23 words
The process of claim 6 wherein the wetting agent is selected from the group consisting of sodium alkylbenzene sulfonates and dioctyl sodium sulfosuccinate.
Claim 9
Dependent Claim
27 words
The process of claim 3 wherein the polymerization catalyst is selected from the group consisting of benzoyl peroxide, lauroyl peroxide, tert-butylperbenzoate, tert-butylperoctoate, 2,5-dimethyl-2,5-bis(2-ethyl hexanoyl peroxy)hexane, and 2,2'-azobisisobutyronitrile.
Claim 10
Dependent Claim
32 words
The process of claim 6 wherein the suspension stabilizer is selected from the group consisting of methylcellulose, hydroxyethylcellulose, hydroxypropylmethylcellulose, styrene-maleic copolymers, polyacrylic acids, methacrylic acids, methylvinylether-maleic copolymers, polyvinyl pyrrolidone, and polyvinyl alcohol.
Claim 11
Dependent Claim
19 words
The process of claim 9 wherein the suspension stabilizer is present from about 0.05 to about 1 weight percent.
Claim 12
Dependent Claim
28 words
The process of claim 6 wherein the suspension stabilizer is a phosphate of an alkaline earth metal in an amount from about 1 to about 5 weight percent.
Claim 13
Dependent Claim
12 words
The process of claim 11 wherein the suspension stabilizer is tricalcium phosphate.
Claim 14
Dependent Claim
13 words
The process of claim 2 wherein the crosslinking agent is a methylene donor.
Claim 15
Dependent Claim
11 words
The process of claim 13 wherein the methylene donor is formaldehyde.
Claim 16
Dependent Claim
22 words
The process of claim 13 wherein the methylene donor is a material selected from the group consisting of formaldehyde, hexamethylenetetramine and paraformaldehyde.
Claim 17
Dependent Claim
22 words
The process of claim 1 wherein the liquid medium is a material selected from the group consisting of water, glycols and alcohols.
Claim 18
Dependent Claim
10 words
The product made according to the process of claim 1.
Claim 19
Dependent Claim
10 words
The product made according to the process of claim 2.
Claim 20
Dependent Claim
10 words
The product made according to the process of claim 3.
Claim 21
Dependent Claim
10 words
The product made according to the process of claim 4.
Claim 22
Dependent Claim
10 words
The product made according to the process of claim 16.
Claim 23
Dependent Claim
10 words
The product made according to the process of claim 6.
Claim 24
Dependent Claim
10 words
The product made according to the process of claim 12.
Claim 25
Dependent Claim
10 words
The product made according to the process of claim 13.
Claim 26
Dependent Claim
10 words
The product made according to the process of claim 14.
Claim 27
Dependent Claim
10 words
The product made according to the process of claim 15.
References Cited (Backward Citations)
US2404192A
Cited
US3089542A
Cited
US3642672A
Cited
US3647722A
Cited
US3781241A
Cited
US3822224A
Cited
US3864304A
Cited
US3823202A
Cited
US3730920A
Cited
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 |