EP0087276A2
Expired / Lapsed
EP
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Frictional materials
Assignee: Japan Kinoko Research Center Foundation
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Filing: 1983-02-17
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Granted: —
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Expires: 2003-02-17
Abstract
Abstract An improved method of manufacturing a frictional material is disclosed wherein a magnetic material is mixed in a preselected proportion with a polymeric or resinous frictional substance, the mixture while in an external magnetic field of a predetermined orientation being formed to yield the frictional material acquiring a frictional anisotropy.
Inventors
- 👤 Kiyoshi Inoue
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 14:14
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/58; B29C70/62; B29C43/00; B29C43/006; B29C48/00; B29C48/022; C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; F; F16; F16D; F16D69/00; F16D69/02; F16D69/025; B29C48/03; B29C48/25; B29C48/36; B29C48/475; B29K; B29K2105/00; B29K2105/06; B29K2105/12; B29L; B29L2031/00; B29L2031/16
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
55 words
A method of manufacturing a frictional material, comprising the steps of: a) mixing uniformly in a preselected proportion magnetic particles with a resinous frictional substance: and b) subjecting the mixture resulting from step a) to an external magnetic field of a predetermined orientation while forming the'mixture to cause said material to acquire a frictional anisotropy.
Claim 2
Independent Claim
55 words
A method of manufacturing a frictional material, comprising the steps of: a) mixing uniformly in a preselected proportion magnetic particles with a resinous frictional substance: and b) subjecting the mixture resulting from step a) to an external magnetic field of a predetermined orientation while forming the'mixture to cause said material to acquire a frictional anisotropy.
Claim 3
Dependent Claim
14 words
The method defined in Claim 1 wherein said frictional substance comprises a thermo-setting resin.
Claim 4
Dependent Claim
23 words
The method defined in Claim 2 wherein said thermo-setting resin is a phenol resin, polyimide resin, epoxy resin, polyester resin or silicon resin.
Claim 5
Dependent Claim
14 words
The method defined in Claim 1 wherein said frictional substance comprises a thermoplastic resin.
Claim 6
Dependent Claim
23 words
The method defined in Claim 4 wherein said thermoplastic resin is a polyethylene resin, nylon (polyamide) resin, acetal copolymer resin or polycarbonate resin.
Claim 7
Dependent Claim
14 words
The method defined in Claim 1 wherein said frictional substance comprises a crystalline resin.
Claim 8
Dependent Claim
23 words
The method defined in Claim 6 ' wherein said crystalline resin is an ethylene tetrafluoride resin, crystalline nylon, polyacetal resin or melamine resin.
Claim 9
Independent Claim
26 words
The method defined in any one of the preceding claims wherein said mixture is subjected to said external magnetic field while being heated in step b).
Claim 10
Independent Claim
74 words
The method defined in any one of Claims 1 to 7 wherein step b) comprises: b1) cold-shaping said mixture under pressure in said external magnetic field to form a compacted body of the mixture of predetermined configuration and size; and b2) subsequently heating the body to allow the resinous substance in pulverized form to coalesce and said magnetic particles to be bonded together and to said coalescing resinous particles to yield said frictional' material.
Claim 11
Independent Claim
78 words
The method defined in any one of Claims 1 to 7 wherein step b) comprises: b1') cold-shaping said mixture under pressure to form a compacted body of the mixture of predetermined configuration and size: and b2') subsequently heating the body in said magnetic field to allow the resinous substance in pulverized form to coalesce and said magnetic particles to be bonded together and to said coalescing resinous particles in a said predetermined orientation to yield said frictional material.
Claim 12
Independent Claim
37 words
The method defined in any one of Claims 1 to 7 wherein step (b) comprises: warm-shaping said mixture at an elevated temperature under pressure in said external magnetic field.to yield the formed body constituting said frictional material.
Claim 13
Independent Claim
23 words
The method defined in any one of the preceding claims wherein said magnetic field has a field strength of 1000 to 10000 Gauss.
Claim 14
Dependent Claim
18 words
The method defined in Claim 12 wherein said magnetic field is of periodically or aperiodically varying field strength.
Claim 15
Independent Claim
23 words
The method defined in any one of the preceding claims wherein said magnetic particles consist at least in part of an iron oxide.
Claim 16
Dependent Claim
18 words
The method defined in Claim 14 wherein said iron oxide is ferric oxide (Fe 2 0 3 ).
Claim 17
Dependent Claim
11 words
The method defined in Claim 15 wherein said oxide is-γ-ferric oxide.
Claim 18
Dependent Claim
19 words
The method defined in Claim 14 wherein said iron oxide is ferrous oxide (Fe 3 0 4 ) '
Claim 19
Dependent Claim
13 words
The method defined in Claim 14 wherein said iron oxide is ferricferrous oxide.
Claim 20
Independent Claim
39 words
The method defined in any one of the preceding claims, further comprising, in step a), adding to said magnetic particles barium sulfate, zinc oxide, silicon oxide, calcium oxide, aluminium oxide, copper, steel, aluminium, lead, graphite, molybdenum disulfide or asbestos.
Claim 21
Independent Claim
29 words
The method defined in any one of the preceding claims, further comprising the step of: imparting sonic or ultrasonic vibrations to said mixture while in said external magnetic field.
Claim 22
Dependent Claim
62 words
Apparatus for carrying out the method defined in Claim 1, the apparatus comprising means for producing a uniform mixture in a preselected proportion, of magnetic particles with a resinous frictional substance; in combination with means for subjecting the said mixture to an external magnetic field of a predetermined orientation while forming the mixture to cause said material to acquire a frictional anisotropy.
Claim 23
Dependent Claim
23 words
The apparatus defined in Claim 21 and including heating means for heating said mixture whilst it is subjected to said external magnetic field.
Claim 24
Dependent Claim
31 words
Frictional material which has been manufactured by the method defined in any one of Claims 1 to 20 or by means of the apparatus defined in Claim 21 or Claim 22.
References Cited (Backward Citations)
No citation records indexed.
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