Patent ID: 9228076
Filing Date: 2016-01-05
CPC Classification: B60C,C08K,C08L,Y10T

Claim Text:
1. A pneumatic tire for heavy load in which a rubber chafer is disposed at least in a part brought into contact with a rim in a bead part, wherein the rubber chafer uses a rubber composition which comprises (A) a rubber component consisting of (i) 45 to 55 parts by mass of butadiene base rubbers consisting of 15 to 45 parts by mass of high cis polybutadiene rubber and 10 to 30 parts by mass of a syndiotactic 1,2-structure-containing polybutadiene rubber and (ii) 45 to 55 parts by mass of a natural rubber, and (B) more than 50 parts by mass and less than 60 parts by mass of carbon black having a dibutyl phthalate absorption (DBP) of 85 to 115 ml/100 g and a specific surface area by nitrogen adsorption (N wherein fractural strength of the rubber chafer is 20 MPa or more in any point of a depth direction from an outer surface part to an inner surface part and a modulus M100 of the rubber chafer in 100% elongation is 2.88 to 3.8 MPa.