US 9,809,058 B2
Tire with rubber tread of intermedial and lateral zones with path of least electrical resistance
Roberto Cerrato Meza, North Canton, OH (US); Junling Zhao, Hudson, OH (US); and Austin Gale Young, Wadsworth, OH (US)
Assigned to The Goodyear Tire & Rubber Company, Akron, OH (US)
Filed by The Goodyear Tire & Rubber Company, Akron, OH (US)
Filed on Jan. 30, 2015, as Appl. No. 14/609,540.
Application 14/609,540 is a continuation in part of application No. 14/470,166, filed on Aug. 27, 2014, abandoned.
Prior Publication US 2016/0059634 A1, Mar. 3, 2016
This patent is subject to a terminal disclaimer.
Int. Cl. B60C 1/00 (2006.01); B60C 11/00 (2006.01); B60C 19/08 (2006.01); B60C 11/03 (2006.01)
CPC B60C 11/0041 (2013.01) [B60C 1/0016 (2013.01); B60C 11/0008 (2013.01); B60C 11/0058 (2013.01); B60C 11/0311 (2013.01); B60C 19/082 (2013.01); B60C 11/0306 (2013.01); B60C 2001/0083 (2013.01); B60C 2011/0016 (2013.01); B60C 2011/0025 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A tire is provided having a circumferential rubber tread composed of a cap/base configuration comprised of an outer tread cap rubber layer with a lug and groove configuration with the outer portions of the tread lugs providing the running surface of the tread, and a tread base rubber layer underlying the outer tread cap rubber layer;
wherein the outer tread cap rubber layer is composed of three circumferential load bearing zones comprised of a silica-rich intermedial tread zone rubber layer positioned between and extending beneath two carbon black-rich lateral tread zone rubber layers to thereby underlie the lateral tread zone rubber layers and overlay the carbon black-rich tread base rubber layer;
wherein outer tread lug surfaces of the intermedial tread zone rubber layer and the lateral tread zone rubber layers comprise the running surface of the tread;
wherein rubber composition of the intermedial tread zone rubber layer has a 100° C. hot rebound property greater than the 100° C. hot rebound property of the rubber composition of said lateral tread zone rubber layers,
wherein a path of least electrical resistance extends from said carbon black-rich lateral rubber tread zone to the carbon black-rich tread base rubber layer by an extension of a lateral tread zone layer which extends to and joins said tread base rubber layer or by an intermediate carbon black-rich rubber bridge which extends between and joins said lateral tread zone rubber layer and said tread base rubber layer,
wherein the silica-rich rubber composition of the intermedial tread zone rubber layer contains at least 40 phr of precipitated silica and a maximum of 30 phr of rubber reinforcing carbon black and is therefore relatively electrical resistive,
wherein the rubber reinforcing carbon black-rich rubber compositions of the lateral tread zone rubber layer, tread base rubber layer and rubber bridge contains at least 40 phr of rubber reinforcing carbon black.