Patent ID: 9580569
Date: 2017-02-28
CPC Classifications: B60C,C08G,C08K,C08L

Claim:
1. A rubber composition for a tire for heavy loads comprising: diene rubber (P) containing at least 60% by mass of natural rubber; silica (Q); carbon black (R); and a silane coupling agent (S); the silane coupling agent (S) being polysiloxane represented by an average compositional formula of formula (1) below; a content of the silica (Q) being from 5 to 50 parts by mass per 100 parts by mass of the diene rubber (P); a content of the carbon black (R) being from 5 to 40 parts by mass per 100 parts by mass of the diene rubber (P); a total content of the silica (Q) and the carbon black (R) being from 30 to 70 parts by mass per 100 parts by mass of the diene rubber (P); and a content of the silane coupling agent (S) being from 2 to 20% by mass relative to the content of the silica (Q): wherein, A represents a divalent organic group having a sulfide group; B represents a monovalent hydrocarbon group having from 5 to 10 carbons; C represents a hydrolyzable group; D represents an organic group having a mercapto group; E represents a monovalent hydrocarbon group having from 1 to 4 carbons; and a to e satisfy relationships of formulas: 0≦a<1, 0≦b<1, 0<c<3, 0<d<1, 0≦e<2, and 0<2a+b+c+d+e<4; however, one of either a or b is not 0.