EP0067111A2
Expired / Lapsed
EP
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Tire with dual tread compound
Assignee: Goodyear Tire and Rubber Co
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Filing: 1982-05-07
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Granted: —
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Expires: 2002-05-07
Abstract
Abstract A tire 10 which has an outer 34 and an inner layer 36 of compound in the non-skid portion 30 of the tread 24 thereof. The outer layer 34 is composed of a lower rolling resistance compound than the inner layer 36. The inner layer 36 is composed of a compound which provides better traction than the compound of the outer layer 34.
Inventors
- 👤 John Milan Cady
- 👤 William Elliott Egan
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 20:35
CPC Classifications
B; B60; B60C; B60C1/00; B60C1/0016; B60C11/00; B60C11/0041; B60C11/005; B60C11/14; B60C11/18; B60C11/0008; B60C2011/0016; B60C2011/0033; Y; Y02; Y02T; Y02T10/00; Y02T10/80; Y02T10/86; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495; Y10T152/10819; Y10T152/10846
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
142 words
A tire with a tread having a non-skid portion, said non-skid portion characterized by being comprised of a radially outer and a radially inner layer of elastomeric compound, said outer layer being composed of a lower rolling resistance compound than said inner layer, and said inner layer being composed of a compound which provides better traction than the compound of said outer layer; wherein said inner layer has a thickness of about 20 to about 80 percent of the thickness of said non-skid portion and wherein said outer layer has a thickness of said non-skid portion; and wherein the thickness of said inner layer is equal to not more than 60 percent of the thickness of said non-skid portion; and wherein the thickness of said inner layer is equal to not more than 60 percent of the thickness of said non-skid portion.
Claim 2
Dependent Claim
142 words
A tire with a tread having a non-skid portion, said non-skid portion characterized by being comprised of a radially outer and a radially inner layer of elastomeric compound, said outer layer being composed of a lower rolling resistance compound than said inner layer, and said inner layer being composed of a compound which provides better traction than the compound of said outer layer; wherein said inner layer has a thickness of about 20 to about 80 percent of the thickness of said non-skid portion and wherein said outer layer has a thickness of said non-skid portion; and wherein the thickness of said inner layer is equal to not more than 60 percent of the thickness of said non-skid portion; and wherein the thickness of said inner layer is equal to not more than 60 percent of the thickness of said non-skid portion.
Claim 3
Dependent Claim
121 words
The tire according to Claim 1, characterized in that the compound of said outer layer has a hot rebound according to ASTM D1054-79 equal to at least 75 percent, and further characterized in that (A) the kinetic coefficient of friction between the compound of said inner layer and a wet concrete surface is at least 5 percent greater than the kinetic coefficient of friction between the compound of said outer layer and the same wet concrete surface and (B) the kinetic coefficient of friction between the compound of said inner layer and a wet asphalt surface is at least 5 percent greater than the kinetic coefficient of friction between the compound of said outer layer and the same wet asphalt surface.
Claim 4
Dependent Claim
125 words
A tire according to Claims 1 or 2 characterized in that the compound of said outer layer is composed of, based upon 100 parts by weight rubber, (1) about 50 to about 90 percent butadiene/styrene_rubber, about 10 to about 50 percent polybutadiene, about 60 to about 80 phr carbon black, and about 25 to about 45 phr processing oil, (2) about 40 to about 60 percent natural rubber, about 40 to about 60 percent polybutadiene, about 40 to about 60 phr carbon black, and about 10 to about 30 phr processing oil, or (3) about 80 to 100 percent natural rubber, 0 to about 20 percent butadiene/styrene rubber, about 40 to about 60 phr carbon black, and about 2 to about 5 phr processing oil.
Claim 5
Dependent Claim
57 words
The tire according to Claim 3, characterized in that the compound of said inner layer is composed of, based upon 100 parts by weight rubber, about 60 to about 90 percent butadiene/styrene rubber, about 10 to about 40 percent polybutadiene, about 70 to about 100 phr carbon black, and about 30 to about 55 phr processing oil.
References Cited (Backward Citations)
No citation records indexed.
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