EP0705722A1
Expired / Lapsed
EP
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Tire with coated silica reinforced rubber tread
Assignee: Goodyear Tire and Rubber Co
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Filing: 1995-09-04
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Granted: —
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Expires: 2015-09-04
Abstract
Abstract The invention relates to a rubber tire (1) with carbon black reinforced carcass (3) and quantitatively silica reinforced rubber tread (2) , said tread having a thin overcoat (7) thereon of rubber containing a quantitative amount of electrically conductive carbon black, a coating composition therefor and a method of application.
Inventors
- 👤 Bharat Kanchanlal Kansupada
- 👤 Michael Julian Crawford
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 03:15
CPC Classifications
B; B60; B60C; B60C19/00; B60C19/08; B60C11/00; B29; B29D; B29D30/00; B29D30/06; B29D30/52; B29D2030/526
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
89 words
A water-based rubber composition characterized by comprising a blend of (A) at least one aqueous rubber latex selected from emulsion polymerization prepared styrene/butadiene copolymer rubber latex, emulsion polymerization prepared polybutadiene latex and natural rubber cis 1,4-polyisoprene latex and (B) an aqueous dispersion of electrically conductive carbon black, wherein said carbon black is present in an amount of 25 to 200 phr and where said rubber/carbon black composition, when dried and sulfur cured, has a surface resistivity of less than about 10,000 ohms according to ASTM Test D257-66, Mod. G.
Claim 2
Dependent Claim
121 words
A method of preparing a rubber tire tread characterized by comprising the steps of (A) applying a coating (7) of the water-based composition of Claim 1 to an outer surface of a cap (2) of an unvulcanized, sulfur curable rubber tire tread of a cap/base construction (2, 6) in a manner that the said coating also extends over and covers at least a portion of an outer surface of the underlying tread base adjuxtapositioned to the outer surface of the said tread cap (2) and (B) drying said coating; wherein said cap rubber contains 40 to 90 phr of silica and up to 10 phr of carbon black and said underlying base rubber contains 40 to 60 phr of carbon black.
Claim 3
Dependent Claim
84 words
A method of preparing a tire (1) characterized by comprising building the rubber tire tread of a cap/base construction (2, 6) prepared according to Claim 2 onto a carbon black reinforced rubber tire carcass containing at least 40 phr of carbon black, wherein the rubber of said tread cap (2) contains 40 to 90 phr of silica and up to about 10 phr of carbon black and the rubber of said tread base and tire carcass contains 40 to 60 phr of carbon black.
Claim 4
Dependent Claim
86 words
A method of preparing a tire (1) characterized by building a rubber tire tread of a cap/base construction (2, 6) onto a rubber tire carcass (3) following which said tire tread is coated in accordance with the method of claim 2; wherein the rubber of said tread cap (2) contains 40 to 90 phr of silica and up to about 10 phr of carbon black and the rubber of said tread base (6) and tire carcass (3) rubber contains at least 40 phr of carbon black.
Claim 5
Dependent Claim
120 words
A method of preparing a tire (1) characterized by building a tire construction with a tire tread coated in accordance with the method of claim 3 or 4 and molding and vulcanizing said coated tire construction in a suitable mold to form a tire having a tread configured with lugs (12) and associated grooves (13) with said coating (7) being covulcanized therewith and extending over the outer surface of said lugs and the surfaces of the walls and bottoms of said grooves wherein said coating extends to and contacts a portion of the said carbon black reinforced rubber of the tread base (6) and/or tire carcass (3) and wherein said coating has a thickness of less than about 0.005 cm.
Claim 6
Dependent Claim
68 words
The method of preparing a tread of claim 2 characterized in that said tread is of a cap/base-wing construction, where the wing (17) of said base is a lateral extension of the base (6) and where said coating (7) extends over and covers at least a portion of an outer surface of said base-wing (17) adjuxtapositioned to the said outer surface of the said tread cap (2) .
Claim 7
Dependent Claim
103 words
The method of preparing a tire (1) of Claim 3, 4 or 5 characterized in that said tread is of a cap/base-wing construction where the wing (17) of the said base (6) extends laterally outward from the base and radially inward over the sidewall portion of the carcass (3) of the tire and where said coating (7) extends over and covers at least a portion of an outer surface of said base-wing (17) adjuxtapositioned to the said outer surface of the said tread cap (2) and is exclusive of the innerface between the tread base and base-wing and the tire carcass sidewall (4).
Claim 8
Dependent Claim
21 words
A tire (1) characterized by being prepared according to the method of any of Claims 3, 4, 5, 6 or 7.
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