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Patent EP0329589A2 successfully refreshed from Google Patents.
EP0329589A2
Expired / Lapsed
EP
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Rubber containing aramid pulp reinforcement
Assignee: Goodyear Tire and Rubber Co
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Filing: 1989-02-17
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Granted: —
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Expires: 2009-02-17
Abstract
Abstract Aramid-reinforced elastomers, including rubber, in which the elastomer is reinforced with specified aramid pulp in the form of short, discontinuous, fibrillated fibers, are disclosed. The elastomers are prepared by first premixing the pulp with a part (less than all) of particulate reinforcement prior to mixing with the elastomer. Vulcanized reinforced elastomers of this invention are especially suitable in pneumatic tires, as components thereof including reinforcing belts 66, sidewall members in the region of the bead 60, 62, belt overlay 68 and edge strips 70 and tread 52.
Inventors
- 👤 Robert John Brown
- 👤 Richard Martin Scriver
- 👤 Joseph Carl Kalchbrenner
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 05:40
CPC Classifications
B; B60; B60C; B60C9/00; B60C9/02; B60C9/12; B60C15/00; B60C15/06; B60C15/0603; B60C15/0607; B60C9/18; B60C9/1821; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495; Y10T152/10855
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
269 words
In a pneumatic tire comprising a plurality of components including a tire tread, a pair of sidewalls, a cord reinforced carcass, a pair of beads and one or more additional elastomeric structural reinforcing components, characterized in that at least one of said components is an aramid fiber-reinforced vulcanized elastomeric composite comprising a matrix of cured elastomer, a reinforcing amount of a particulate reinforcing agent or mixture thereof, and an effective reinforcing amount, not exceeding 5 phr, of short, discontinuous, fibrillated aramid fibers dispersed therein, said fibers being composed of (a) a trunk portion having a length in the range of about 0.2 to about 5 millimeters, a diameter in the range of about 0.005 to about 0.02 millimeters and an aspect ratio greater than about 100, and (b) a plurality of fibrils extending outwardly from said trunk and having diameters substantially smaller than the diameter of the trunk from which they extend, said fibers having a surface area in the range of about 4 to about 20 square meters per gram, and further characterized in that said composite is prepared by a process which comprises (1) forming a premix consisting of the said aramid fibers with at least a portion and less than all of said particulate reinforcing agent or mixture thereof, the quantity of said reinforcing agent or mixture thereof being sufficient to cause partitioning of said aramid fibers and thereby promote subsequent compounding of said aramid fibers with elastomer, (2) mixing said premix with a vulcanizable elastomer, the remaining portion of said reinforcing agent or mixture thereof, and additional tire compounding ingredients and (3) curing the tire.
Claim 2
Dependent Claim
269 words
In a pneumatic tire comprising a plurality of components including a tire tread, a pair of sidewalls, a cord reinforced carcass, a pair of beads and one or more additional elastomeric structural reinforcing components, characterized in that at least one of said components is an aramid fiber-reinforced vulcanized elastomeric composite comprising a matrix of cured elastomer, a reinforcing amount of a particulate reinforcing agent or mixture thereof, and an effective reinforcing amount, not exceeding 5 phr, of short, discontinuous, fibrillated aramid fibers dispersed therein, said fibers being composed of (a) a trunk portion having a length in the range of about 0.2 to about 5 millimeters, a diameter in the range of about 0.005 to about 0.02 millimeters and an aspect ratio greater than about 100, and (b) a plurality of fibrils extending outwardly from said trunk and having diameters substantially smaller than the diameter of the trunk from which they extend, said fibers having a surface area in the range of about 4 to about 20 square meters per gram, and further characterized in that said composite is prepared by a process which comprises (1) forming a premix consisting of the said aramid fibers with at least a portion and less than all of said particulate reinforcing agent or mixture thereof, the quantity of said reinforcing agent or mixture thereof being sufficient to cause partitioning of said aramid fibers and thereby promote subsequent compounding of said aramid fibers with elastomer, (2) mixing said premix with a vulcanizable elastomer, the remaining portion of said reinforcing agent or mixture thereof, and additional tire compounding ingredients and (3) curing the tire.
Claim 3
Dependent Claim
33 words
A tire according to claim 1 characterized in that the amount of said aramid fibers is from about 0.2 to about 2 parts by weight based on 100 parts of said cured elastomer.
Claim 4
Dependent Claim
32 words
A tire according to claim 1 characterized in that said tire includes a reinforcing belt between said carcass and said tread, said belt comprising at least one ply of said elastomeric composite.
Claim 5
Dependent Claim
19 words
A tire according to claim 1 characterized in that said tire includes a belt overlay of said elastomeric composite.
Claim 6
Dependent Claim
28 words
A tire according to claim 1 characterized in that said tire includes members of generally triangular cross section of said elastomeric composite extending radially outwardly from said beads.
Claim 7
Dependent Claim
40 words
A tire according to claim 1 characterized in that said tire includes at least one toroidal member of generally triangular cross section of said elastomeric composite extending radially outwardly from said beads and diminishing in thickness as it extends outwardly.
Claim 8
Dependent Claim
36 words
A tire according to claim 1 characterized in that the amount of said particulate reinforcing agent or mixture thereof is from about 30 to about 100 parts by weight per 100 parts of said cured elastomer.
Claim 9
Dependent Claim
15 words
A tire according to claim 7 characterized in that said reinforcing agent is carbon black.
Claim 10
Dependent Claim
14 words
A tire according to claim 7 characterized in that said reinforcing agent is silica.
Claim 11
Dependent Claim
186 words
A process for preparing a vulcanized elastomer composite characterized by comprising: (a) forming a premix of fibrillated aramid fibers and one or more particulate reinforcing agents, said premix containing the aramid fibers desired in said composite and sufficient quantity of but less than all of the said reinforcing agent to cause partitioning of said aramid fibers and thereby promote subsequent compounding of said aramid fibers with elastomers, said aramid fibers being composed of (1) a trunk portion having a length in the range of about 0.2 to about 5 millimeters, a diameter in the range of about 0.005 to about 0.02 millimeters and an aspect ratio greater than about 100, and (2) a plurality of fibrils extending outwardly from said trunk and having diameters substantially smaller than the diameter of the trunk from which they extend, said fibers having a surface area in the range of about 4 to about 20 square meters per gram, (b) mixing said premix with a vulcanizable elastomeric matrix material, additional amounts of said one or more particulate reinforcing agents and additional tire compounding ingredients and (c) curing the resulting composition.
Claim 12
Dependent Claim
186 words
A process for preparing a vulcanized elastomer composite characterized by comprising: (a) forming a premix of fibrillated aramid fibers and one or more particulate reinforcing agents, said premix containing the aramid fibers desired in said composite and sufficient quantity of but less than all of the said reinforcing agent to cause partitioning of said aramid fibers and thereby promote subsequent compounding of said aramid fibers with elastomers, said aramid fibers being composed of (1) a trunk portion having a length in the range of about 0.2 to about 5 millimeters, a diameter in the range of about 0.005 to about 0.02 millimeters and an aspect ratio greater than about 100, and (2) a plurality of fibrils extending outwardly from said trunk and having diameters substantially smaller than the diameter of the trunk from which they extend, said fibers having a surface area in the range of about 4 to about 20 square meters per gram, (b) mixing said premix with a vulcanizable elastomeric matrix material, additional amounts of said one or more particulate reinforcing agents and additional tire compounding ingredients and (c) curing the resulting composition.
Claim 13
Dependent Claim
21 words
A tire according to claim 1 characterized in that said tread is a component thereof which comprises said aramid fiber-reinforced composite.
Claim 14
Dependent Claim
230 words
A tire having a tread characterized by comprising an aramid fiber-reinforced vulcanized elastomeric composite comprising a matrix of cured elastomer, particulate reinforcing agent therefor, additional tire compounding ingredients and about 1 to about 5 parts by weight, per 100 parts of said rubber, of short, discontinuous fibrillated aramid fibers being composed of (i) a trunk portion having a length in the range of about 0.2 to about 5 millimeters, a diameter in the range of about 0.005 to about 0.2 millimeters and an aspect ratio greater than about 100, and (ii) a plurality of fibrils extending outwardly from said trunk and having diameters substantially smaller than the diameter of the trunk from which they extend, said fibers having a surface area in the range of about 4 to about 20 square meters per gram, and further characterized in that said composite is prepared by a process which comprises (1) forming a premix of said aramid fibers with at least a portion but less than all of said particulate reinforcing agent or mixture thereof the quantity of said reinforcing agent or mixture thereof being sufficient to cause partitioning of said aramid fibers and thereby promote subsequent compounding of said aramid fibers with elastomer, (2) mixing said premix with a vulcanizable elastomer, the remaining portion of said reinforcing agent or mixture thereof, and additional tire compounding ingredients and (3) curing the tire.
Claim 15
Dependent Claim
230 words
A tire having a tread characterized by comprising an aramid fiber-reinforced vulcanized elastomeric composite comprising a matrix of cured elastomer, particulate reinforcing agent therefor, additional tire compounding ingredients and about 1 to about 5 parts by weight, per 100 parts of said rubber, of short, discontinuous fibrillated aramid fibers being composed of (i) a trunk portion having a length in the range of about 0.2 to about 5 millimeters, a diameter in the range of about 0.005 to about 0.2 millimeters and an aspect ratio greater than about 100, and (ii) a plurality of fibrils extending outwardly from said trunk and having diameters substantially smaller than the diameter of the trunk from which they extend, said fibers having a surface area in the range of about 4 to about 20 square meters per gram, and further characterized in that said composite is prepared by a process which comprises (1) forming a premix of said aramid fibers with at least a portion but less than all of said particulate reinforcing agent or mixture thereof the quantity of said reinforcing agent or mixture thereof being sufficient to cause partitioning of said aramid fibers and thereby promote subsequent compounding of said aramid fibers with elastomer, (2) mixing said premix with a vulcanizable elastomer, the remaining portion of said reinforcing agent or mixture thereof, and additional tire compounding ingredients and (3) curing the tire.
Claim 16
Dependent Claim
28 words
A tire according to claim 12 characterized in that the amount of said aramid fibers is from 0.2 to 2 parts by weight, per 100 parts of rubber.
Claim 17
Dependent Claim
14 words
A tire according to claim 1 characterized in that said cured elastomer is rubber.
Claim 18
Dependent Claim
63 words
A tire according to claim 1 characterized in that the particulate reinforcing agent or mixture thereof and said additional tire compounding ingredients are conventional tire compounding said ingredients and said mixing of said premix with said vulcanizable elastomer, said remaining portion of reinforcing agent or mixture thereof and said additional tire compounding ingredients is carried at in the substantial absence of additional materials.
Claim 19
Dependent Claim
21 words
A process according to claim 10 characterized in that said vulcanized elastomer composite or a portion thereof forms a tire tread.
Claim 20
Dependent Claim
32 words
A process according to claim 10 further characterized by including the additional step of forming the unvulcanized elastomer composite prepared in step (b) into a tire tread, and thereafter curing said composite.
Claim 21
Dependent Claim
232 words
A process for building a tire containing one or more aramid-reinforced components including a tread, said process characterized by comprising: (a) forming a premix of fibrillated aramid fibers and one or more particulate reinforcing agents, said premix containing the entire quantity of aramid fibers desired in said composite and sufficient quantity but not all of said particulate reinforcing agent to cause partitioning of said aramid fibers and thereby promote subsequent compounding of said aramid fibers with elastomer, said aramid fibers being composed of (1) a trunk portion having a length in the range of about u.2 to about 5 millimeters, a diameter in the range of about 0.005 to about 0.02 millimeters and an aspect ratio greater than about 100, and (2) a plurality of fibrils extending outwardly from said trunk and having diameters substantially smaller than the diameter of the trunk from which they extend, said fibers having a surface area in the range of about 4 to about 20 square meters per gram. (b) mixing said premix with a vulcanizable elastomeric matrix material, additional amounts of said one or more particulate reinforcing agents, and additional tire compounding ingredients and (c) forming the resulting unvulcanized elastomer composite or one or more portions thereof into one or more tire components, including a tread, in which aramid reinforcement is desired, (d) assembling said components into an uncured tire, and (e) curing the tire.
Claim 22
Dependent Claim
232 words
A process for building a tire containing one or more aramid-reinforced components including a tread, said process characterized by comprising: (a) forming a premix of fibrillated aramid fibers and one or more particulate reinforcing agents, said premix containing the entire quantity of aramid fibers desired in said composite and sufficient quantity but not all of said particulate reinforcing agent to cause partitioning of said aramid fibers and thereby promote subsequent compounding of said aramid fibers with elastomer, said aramid fibers being composed of (1) a trunk portion having a length in the range of about u.2 to about 5 millimeters, a diameter in the range of about 0.005 to about 0.02 millimeters and an aspect ratio greater than about 100, and (2) a plurality of fibrils extending outwardly from said trunk and having diameters substantially smaller than the diameter of the trunk from which they extend, said fibers having a surface area in the range of about 4 to about 20 square meters per gram. (b) mixing said premix with a vulcanizable elastomeric matrix material, additional amounts of said one or more particulate reinforcing agents, and additional tire compounding ingredients and (c) forming the resulting unvulcanized elastomer composite or one or more portions thereof into one or more tire components, including a tread, in which aramid reinforcement is desired, (d) assembling said components into an uncured tire, and (e) curing the tire.
Claim 23
Dependent Claim
16 words
A process according to claim 18 characterized in that the vulcanizable elastomeric matrix material is rubber.
Claim 24
Dependent Claim
17 words
A process according to claim 18 characterized in that one of said tire components is the tread.
References Cited (Backward Citations)
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