Patent ID: 8453693
Filing Date: 2013-06-04
Classification: B60C,C08K,C08L,Y02T,Y10T

Abstract:
1. A pneumatic radial tire of the type having a circumferentially extending equatorial plane of the tire, the tire comprising a carcass, a tread radially outward of the carcass, the carcass comprising at least one carcass reinforcing ply, opposing bead portions, and opposing sidewalls, the carcass reinforcing ply having a main portion extending between the opposing bead portions and a pair of turnup portions, each turnup portion extending from one end of the main portion, each bead portion having a bead core, and a reinforcement cavity outward of each bead core, the cavity located between the main portion and one turnup portion of the at least one reinforcing ply, the tire characterized by: the reinforcement cavities being apex-less and having a dimension and configuration for close receipt of a chipper layer therein, each reinforcement cavity situated between a ply turnup tire portion and ply main portion and having a substantially constant width along a chipper layer-receiving midsection; a chipper layer located in each of the reinforcement cavities in each bead portion of the tire and adjacent to the at least one carcass reinforcing ply wherein the chipper layer is a chopped carbon fiber and aramid composite reinforced elastomeric layer; the tread comprising a radially outer tread cap and a radially inner tread base radially underneath the tread cap, the tread base comprising a rubber composition comprising 100 phr of an elastomer consisting of: from 15 to 45 phr of styrene-butadiene rubber; from 20 to 50 phr of cis 1,4-polybutadiene; and from 10 to 35 phr of natural or synthetic polyisoprene; and from 35 to 65 phr of carbon black.