EP0264096A2
Expired / Lapsed
EP
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Acrylic containing friction materials
Assignee: Wyeth Holdings LLC
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Filing: 1987-10-13
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Granted: —
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Expires: 2007-10-13
Abstract
Abstract The addition of fibrillated acrylic fiber to non-asbestos type friction material compositions provides marked improvement in the flexural strength and structural integrity of preforms used in the manufacture of friction elements. The consequent handling characteristics of the preform provides improvement in the manufacturing of the friction element.
Inventors
- 👤 Leigh Tucker Doxsee
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 09:31
CPC Classifications
F; F16; F16D; F16D69/00; F16D69/02; F16D69/025; F16D69/026
Claims Analysis
Total Claims: 43
Claim 1
Independent Claim
44 words
A non-asbestos type friction material composition suitable for use as a friction element comprising a thermosetting binder, a fibrous reinforcing material and an effective amount of a fibrillated acrylic fiber to result in good structural integrity of a preform manufactured from said friction material.
Claim 2
Dependent Claim
44 words
A non-asbestos type friction material composition suitable for use as a friction element comprising a thermosetting binder, a fibrous reinforcing material and an effective amount of a fibrillated acrylic fiber to result in good structural integrity of a preform manufactured from said friction material.
Claim 3
Dependent Claim
32 words
The friction material of Claim 1 wherein said fibrillated fiber has a Canadian Standard Freeness of less than 200 in combination with a Tensile Strength of at least 5 pounds per inch.
Claim 4
Dependent Claim
19 words
The friction material of Claim 2 wherein said fibrillated fiber has a Canadian Standard Freeness of less than 100.
Claim 5
Dependent Claim
21 words
The friction material of Claim 2 wherein the acrylonitrile monomer contribution to said fibrillated fiber is at least 85%, by weight.
Claim 6
Dependent Claim
15 words
The friction material of Claim 4 wherein a comonomer of said acrylonitrile comprises methyl methacrylate.
Claim 7
Dependent Claim
22 words
The friction material of Claim 4 wherein the acrylonitrile monomer contribution to said fibrillated fiber is at least about 89%, by weight.
Claim 8
Dependent Claim
15 words
The friction material of Claim 6 wherein a comonomer of said acrylonitrile comprises methyl methacrylate.
Claim 9
Dependent Claim
23 words
The friction material of Claim 4 wherein the acrylonitrile monomer contribution to said fibrillated fiber is about 89% to about 90%, by weight.
Claim 10
Dependent Claim
15 words
The friction material of Claim 8 wherein a comonomer of said acrylonitrile comprises methyl methacrylate.
Claim 11
Dependent Claim
30 words
The composition of Claim 2 wherein said non-asbestos type friction material is a member selected from the group consisting of semi-metallic material, organic non-asbestos material and hydrocarbon cold forming material.
Claim 12
Dependent Claim
29 words
The composition of Claim 10 wherein said fibrillated fiber is included in an effective amount of about 15%, by weight, based upon the total weight of all other ingredients.
Claim 13
Dependent Claim
30 words
The composition of Claim 10 wherein said fibrillated fiber is included in an amount from about 0.5% to 10%, by weight, based upon the total weight of all other ingredients.
Claim 14
Dependent Claim
14 words
The composition of Claim 10 wherein said non-asbestos type friction material is semi-metallic material.
Claim 15
Dependent Claim
21 words
The composition of Claim 13 wherein said semi-metallic material contains phenolic resin, carbonaceous particles, non-asbestos fibers, ceramic powders and metal powder.
Claim 16
Dependent Claim
49 words
The composition of Claim 14 wherein said semi-metallic material comprises from 4 to 13 wt.% of phenolic resin, from 15 to 40 wt.% of carbonaceous particles, from 0.25 wt.% of non-asbestos fibers, from 2 to 10 wt.% of ceramic powder, and from 15 to 40 wt.% of metal powder.
Claim 17
Dependent Claim
16 words
The composition of Claim 10 wherein said non-asbestos type friction material is an organic non-asbestos material.
Claim 18
Dependent Claim
60 words
The composition of Claim 16 wherein said organic non-asbestos material contains a thermosetting resin, cashew nut particles, non-asbestos fibers and more than 20 wt.% of a powdered inorganic compound having a Moh's hardness rating of greater than 2 and less than 5 and capable of being subjected to temperatures of greater than about 425°C without substantial chemical of physical alteration.
Claim 19
Dependent Claim
41 words
The composition of Claim 17 wherein said organic non-asbestos material comprises from 10 to 30 wt.% thermosetting resin, from 5 to 25 wt.% cashew nut particles, from 5 to 15 wt.% non-asbestos fibers and 20 to 60 wt.% powdered inorganic compound.
Claim 20
Dependent Claim
19 words
The composition of Claim 16 wherein said organic non-asbestos material contains a phenolformaldehyde resin, carbon fibers and steel fibers.
Claim 21
Dependent Claim
38 words
The composition of Claim 29 wherein said non-asbestos material contains from 6 to 12 wt.% phenolformaldehyde resin, from 10 to 40 wt.% carbon fibers, from 30 to 60 wt.% steel fibers, and from 10 to 20 wt.% filler.
Claim 22
Dependent Claim
17 words
The composition of Claim 10 wherein said non-asbestos type friction material is a hydrocarbon cold forming material.
Claim 23
Dependent Claim
95 words
The composition of Claim 21 wherein said hydrocarbon cold forming material contains non-asbestos inorganic fibers, cellulose fibers and a thermosetting organc binder comprising a hydroxyl terminated butadiene copolymer of the formula: HO + (CH₂―CH = CH―CH₂) a ― ( H―CH₂) b + n OH wherein x is phenyl or CN, a has a value of from 0.05 to 0.95, b has a value of from 0.005 to 0.5, and n is an integer from about 10 to 140, said binder having been cured with from about 0.1 to about 5 wt.% of a peroxide catalyst.
Claim 24
Dependent Claim
56 words
The composition of Claim 22 wherein said hydrocarbon cold forming material contains from about 20 to 70 wt.% non-asbestos inorganic fibers, from 5 to 25 wt.% cellulose fibers, 0 to 15 wt.% coke particles, 0 to 10 wt.% graphite particles, 0 to 15 wt.% carbon black and 10 to 60 wt.% of said thermosetting organic binder.
Claim 25
Dependent Claim
91 words
The composition of Claim 23 wherein said hydrocarbon cold forming material contains metallic materials, graphite particles, bonded together with a thermosetting hydroxyl butadiene copolymer of the formula: HO + (CH₂―CH = CH―CH₂) a ―( H―CH₂) b + n OH wherein X is phenyl or CN, a has a value of from 0.5 to 0.95, b has a value of from 0.005 to 0.5, and n is an integer from about 10 to about 140, said copolymer having been cured with from about 0.02 to about 12.5 wt.% of a peroxide catalyst.
Claim 26
Dependent Claim
106 words
The composition of Claim 24 wherein said hydrocarbon cold forming material contains from 15 to 75 wt.% metallic material, from 5 to 50 wt.% graphite particles bonded together with about 2 to 50 wt.% of a thermosetting hydroxyl butadiene copolymer of the formula: HO + (CH₂―CH = CH―CH₂) a ―( H―CH₂) b + n OH wherein X is phenyl or CN, a has a value of from 0.5 to 0.95, b has a value of from 0.05 to 0.5 and n is an integer from about 10 to 140, said copolymer having been cured with from about 0.02 to about 12.5 wt.% of a peroxide catalyst.
Claim 27
Independent Claim
50 words
A method of making a preform of a non-asbestos type friction material, comprising: forming a mixture of a thermosetting binder, fibrous reinforcing material and an effective amount of a fibrillated acrylic polymer fiber to result in good structural integrity of said preform and compressing said mixture to form a preform.
Claim 28
Independent Claim
50 words
A method of making a preform of a non-asbestos type friction material, comprising: forming a mixture of a thermosetting binder, fibrous reinforcing material and an effective amount of a fibrillated acrylic polymer fiber to result in good structural integrity of said preform and compressing said mixture to form a preform.
Claim 29
Dependent Claim
30 words
The method of Claim 26 wherein said non-asbestos type friction material is a member selected from the group consisting of semi-metallic material, organic non-asbestos material and hydrocarbon cold forming material.
Claim 30
Dependent Claim
30 words
The method of Claim 27 wherein said fibrillated acrylic fiber is included in an effective amount up to 15%, by weight, based upon the total weight of all other ingredients.
Claim 31
Dependent Claim
30 words
The method of Claim 28 wherein said fibrillated acrylic fiber is included in an amount from 0.5 to 10%, by weight, based on the total weight of all other ingredients.
Claim 32
Dependent Claim
14 words
The method of Claim 29 wherein said non-asbestos type friction material is semi-metallic material.
Claim 33
Dependent Claim
15 words
The method of Claim 29 wherein said non-asbestos type friction material is organic non-asbestos material.
Claim 34
Dependent Claim
16 words
The method of Claim 29 wherein said non-asbestos type friction material is hydrocarbon cold forming material.
Claim 35
Dependent Claim
66 words
In a method of manufacturing a friction element which includes the steps of forming a mixture of a friction material composition, compressing said mixture to form a preform, curing said preform at an elevated temperature, and forming a friction element from said cured preform, wherein the improvement comprises including an effective amount of a fibrillated acrylic fiber to result in good structural integrity of the preform.
Claim 36
Dependent Claim
66 words
In a method of manufacturing a friction element which includes the steps of forming a mixture of a friction material composition, compressing said mixture to form a preform, curing said preform at an elevated temperature, and forming a friction element from said cured preform, wherein the improvement comprises including an effective amount of a fibrillated acrylic fiber to result in good structural integrity of the preform.
Claim 37
Dependent Claim
14 words
The method of Claim 33 wherein said compressing step is preformed at ambient temperature.
Claim 38
Dependent Claim
30 words
The method of Claim 33 wherein said non-asbestos type friction material is a member selected from the group consisting of semi-metallic material, organic non-asbestos material and hydrocarbon cold forming material.
Claim 39
Dependent Claim
30 words
The method of Claim 35 wherein said fibrillated acrylic fiber is included in an effective amount up to 15%, by weight, based upon the total weight of all other ingredients.
Claim 40
Dependent Claim
30 words
The method of Claim 36 wherein said fibrillated acrylic fiber is included in an amount from 0.5 to 10%, by weight, based upon the total weight of all other ingredients.
Claim 41
Dependent Claim
14 words
The method of Claim 37 wherein said non-asbestos type friction material is semi-metallic material.
Claim 42
Dependent Claim
15 words
The method of Claim 37 wherein said non-asbestos type friction material is organic non-asbestos material.
Claim 43
Dependent Claim
16 words
The method of Claim 37 wherein said non-asbestos type friction material is hydrocarbon cold forming material.
References Cited (Backward Citations)
No citation records indexed.
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