EP0732229A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Tire having silica reinforced rubber tread with outer cap containing carbon black
Assignee: Goodyear Tire and Rubber Co
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Filing: 1996-03-01
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Granted: —
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Expires: 2016-03-01
Abstract
Abstract The invention relates to a rubber tire composed of carbon black reinforced rubber carcass and having a rubber tread which is quantitatively reinforced with silica and which, in turn, has a thin, integral, rubber outer cap on its outer surface which contains a quantitative amount of carbon black. In one aspect, said outer cap, sometimes referred to herein as an outer top cap, extends across the outer surface of the tread which is normally intended to be ground contacting and in an alternative aspect, the outer top cap extends only over the outer portion, namely the peripheral edges, of said tread surface intended to be ground contacting. The outer, carbon black reinforced, rubber tread top cap connects with at least one other carbon black reinforced rubber component of the tire in a manner to provide a path of reduced electrical resistance from said outer tread top cap to the bead portion of the tire carcass and, therefore, such a path from the vehicle to the road surface.
Inventors
- 👤 Michael Julian Crawford
- 👤 Donald George Vera
- 👤 Douglas Blair Dotts
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 20:37
CPC Classifications
B; B29; B29D; B29D30/00; B29D30/06; B29D30/52; B29D30/58; B29D30/62; B60; B60C; B60C11/00; B60C11/14; B60C11/18; B60C19/00; B60C19/08; B29D2030/526; Y; Y10; Y10S; Y10S152/00; Y10S152/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
122 words
A pneumatic tire composed of a carbon black reinforced rubber carcass containing sidewalls, bead portions and a circumferential rubber tread, wherein said tread is characterized by being comprised of a co-extruded sulfur vulcanizable rubber laminae composed of (i) a tread, and (ii) an outer top cap layer; wherein said top cap layer contacts at least a portion of said tire carcass and extends over the outer surface portion of said tread designed to be ground contacting; wherein said tread contains 30 to 100 phr of precipitated silica and, optionally, up to 20 phr of carbon black; and wherein said tread outer top cap contains 25 to 100 phr of carbon black having a CTAB value in a range of 80 to 150.
Claim 2
Dependent Claim
188 words
A pneumatic tire composed of a carbon black reinforced rubber carcass having sidewalls, bead portions and a circumferential rubber tread of a cap/base construction, characterized in that the said tread is comprised of a co-extruded sulfur vulcanizable rubber laminae composed of (i) a tread cap, (ii) an underlying tread base, (iii) optionally miniwings, and (iv) an outer top cap layer; wherein said tread base and/or miniwings, if miniwings are used, contact the sidewall of the tire carcass, wherein said miniwings, if used, extend over a portion of the sidewall of said tire carcass; wherein said top cap layer contacts and extends from at least a portion of said tread base and/or miniwings in contact with said tire carcass sidewall to and over the outer surface portion of said tread cap designed to be ground contacting; wherein said tread cap contains 30 to 100 phr of precipitated silica and, optionally, up to 20 phr of carbon black; and wherein said tread outer top cap, said tread base and optional miniwings contain 25 to 100 phr of carbon black having a CTAB value in a range of 80 to 150.
Claim 3
Dependent Claim
45 words
The tire of claim 2 characterized in that the tire is vulcanized whereby the said tread top cap is co-vulcanized and integral with said tread cap and also said tread cap and/or optional miniwings and wherein said tread cap has a lug and groove configuration.
Claim 4
Dependent Claim
61 words
The tire of claim 3 characterized in that the said tread top cap is integral with and covers the outer surface of said tread base and/or miniwings, if miniwings are used, provided, however, that the tread top cap layer is exclusive of at least a portion of the circumferential extremity of said tread base and/or miniwing which contacts the carcass sidewall.
Claim 5
Dependent Claim
48 words
The tire of claim 1 characterized in that the sidewalls of the tire carcass extend over at least a portion of the circumferential extremities of the sides of the tire tread, with the tread's adherent, co-extruded, co-vulcanized top cap layer positioned between said tread and said overlaying sidewall.
Claim 6
Dependent Claim
53 words
The tire of claim 1, 2, 3, 4 or 5 characterized in that the said integral top cap layer is integral with and circumferentially covers the peripheral outer surface of each side of the outer tread surface adapted to be ground contacting and covers less than the total outer surface of the tread.
Claim 7
Dependent Claim
28 words
The tire of claim 1 or 2 characterized in that the said tread laminae are formed by co-extrusion at a temperature in a range of 80°C to 150°C.
Claim 8
Dependent Claim
41 words
The tire of any of claims 4 to 6 characterized in that the tire is vulcanized whereby the said tread top cap is co-vulcanized and integral with said tread cap and wherein said tread cap has a lug and groove configuration.
Claim 9
Dependent Claim
70 words
The tire of claim 3 or 8 characterized in that and with a restriction that said tire without said tread top cap layer has an electrical resistance greater than 200 megohms and said tire with said tread top cap has an electrical resistance of less than 100 megohms, according to Test GT-R, and in that said top cap layer has a thickness in a range of 0.005 to 0.8 cm.
References Cited (Backward Citations)
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