Patent US4197223A successfully refreshed from Google Patents.
US4197223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Asbestos free friction materials
Assignee: Federal Mogul Friction Products Ltd
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Filing: 1978-08-01
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Granted: 1980-04-08
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Expires: 1998-08-01
Abstract
Abstract The invention concerns a composition for a friction material, e.g. for a clutch facing, of the type containing a fibrous reinforcement, a binder and various additives. The composition contains a thermoset binder, the binder making up 15 to 40% by volume of the material. The fibrous reinforcement is a mixture of inorganic and organic fibres which makes up about 70 to 33% by volume of the material. The inorganic fibre is selected from metal fibres, glass fibre, mineral wools, silica fibres and ceramic fibres. The organic fibre can be wood pulp, jute, sisal, cotton.
Inventors
- 👤 David T. Bartram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:02
CPC Classifications
F; F16; F16D; F16D69/00; F16D69/02; C; C08; C08J; C08J5/00; D; D01; D01G; D01G13/00
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
154 words
A friction material composition suitable for the manufacture of friction materials by a slurry technique which comprises a thermosetting binder, a fibrous reinforcement together with other fillers and additives, wherein: (a) the thermosetting binder constitutes 15% to 40% by volume of the composition and comprises a phenol-formaldehyde resin, a heat and chemical resistant rubber or a mixture thereof; (b) the fibrous reinforcement constitutes 70% to 33% by volume of the material and consists essentially of a mixture of: (i) at least one non-asbestos inorganic fibrous material selected from the group consisting of glass fiber, mineral fibers manufactured from slags or naturally occurring rocks, silica fibers and ceramic fibers of the aluminosilicate type, and (ii) 3% to 20% by volume of a synthetic organic fiber or an opened natural organic fiber; (c) the balance of the composition consisting essentially or selected from the group consisting of inorganic filler, friction and wear modifiers and mixture thereof.
Claim 2
Dependent Claim
154 words
A friction material composition suitable for the manufacture of friction materials by a slurry technique which comprises a thermosetting binder, a fibrous reinforcement together with other fillers and additives, wherein: (a) the thermosetting binder constitutes 15% to 40% by volume of the composition and comprises a phenol-formaldehyde resin, a heat and chemical resistant rubber or a mixture thereof; (b) the fibrous reinforcement constitutes 70% to 33% by volume of the material and consists essentially of a mixture of: (i) at least one non-asbestos inorganic fibrous material selected from the group consisting of glass fiber, mineral fibers manufactured from slags or naturally occurring rocks, silica fibers and ceramic fibers of the aluminosilicate type, and (ii) 3% to 20% by volume of a synthetic organic fiber or an opened natural organic fiber; (c) the balance of the composition consisting essentially or selected from the group consisting of inorganic filler, friction and wear modifiers and mixture thereof.
Claim 3
Dependent Claim
23 words
A friction material according to claim 1 in which the fibrous reinforcement constitutes about 33% to 50% by volume of the friction material.
Claim 4
Dependent Claim
29 words
A friction material according to claim 1 or 2 in which the amount of inorganic fibrous material is in the range 20 to 40% by volume of the material.
Claim 5
Dependent Claim
22 words
A friction material according to claim 1 or 2 in which the inorganic fibrous material is in the form of glass fibre.
Claim 6
Dependent Claim
23 words
A friction material according to claim 1 in which the organic fibrous material comprises short lengths of fibre and is a natural fibre.
Claim 7
Dependent Claim
18 words
A friction material according to claim 5 in which the fibre comprises wood pulp, jute, sisal or cotton.
Claim 8
Dependent Claim
14 words
A friction material according to claim 1 in which said rubber is nitrile rubber.
Claim 9
Dependent Claim
17 words
A friction material according to claim 1 or 2 which comprises at least one inorganic particulate filler.
Claim 10
Dependent Claim
31 words
A friction material according to claim 1 or 2 which includes one or more friction or wear modifiers selected from graphite, molybdenum disulphide, antimony trisulphide and copper, zinc, brass and aluminium.
Claim 11
Dependent Claim
12 words
A clutch facing comprising a friction material as claimed in claim 1.
Claim 12
Dependent Claim
21 words
A friction material according to claim 1 in which the phenol-formaldehyde resin constitutes at least half of the binder by volume.
Claim 13
Dependent Claim
148 words
A clutch facing manufactured by the slurry technique from a friction material composition comprising, in percent by volume: (1) from 15% to 40% of a thermosetting binder composed of a pheno-formaldehyde resin or a phenol-formaldehyde resin admixed with a heat and chemical resistant nitrile rubber latex; (2) from 70% to 33% of an asbestos free fibrous reinforcement consisting essentially of a mixture of: (a) short lengths of glass fiber in the form of milled glass fibers, chopped strand glass or mixtures thereof as the main inorganic reinforcement of the friction material, the inorganic fibers constituting 20% to 40% by volume of the material, (b) from 3% to 20% of the composition of short lengths of organic opened fiber sufficient to convey green strength to the friction material during production; (3) the balance of the composition constituted by at least one of inorganic fillers, friction modifiers and wear modifiers.
Claim 14
Dependent Claim
148 words
A clutch facing manufactured by the slurry technique from a friction material composition comprising, in percent by volume: (1) from 15% to 40% of a thermosetting binder composed of a pheno-formaldehyde resin or a phenol-formaldehyde resin admixed with a heat and chemical resistant nitrile rubber latex; (2) from 70% to 33% of an asbestos free fibrous reinforcement consisting essentially of a mixture of: (a) short lengths of glass fiber in the form of milled glass fibers, chopped strand glass or mixtures thereof as the main inorganic reinforcement of the friction material, the inorganic fibers constituting 20% to 40% by volume of the material, (b) from 3% to 20% of the composition of short lengths of organic opened fiber sufficient to convey green strength to the friction material during production; (3) the balance of the composition constituted by at least one of inorganic fillers, friction modifiers and wear modifiers.
Claim 15
Dependent Claim
16 words
A clutch facing according to claim 12 wherein said organic opened fiber is cellulose wood pulp.
Claim 16
Dependent Claim
30 words
A clutch facing according to claim 12 said thermosetting binder is a mixture of nitrile rubber latex and a phenol-formaldehyde resin constituting at least half the volume of said binder.
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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) | 1983-04-08 | 1983-10-08 | 1984-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-08 | 1987-10-08 | 1988-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-08 | 1991-10-08 | 1992-04-08 | $7700.00 | Window Closed / Lapsed |