Patent ID: 9267020
Filing Date: 2016-02-23
CPC Classification: C08K,C08L

Claim Text:
1. A pneumatic tire produced using a rubber composition containing a rubber component, and carbon black, silica, or carbon black and silica, wherein based on 100% by mass of the rubber component, the rubber component contains 7 to 40% by mass of natural rubber, 1 to 10% by mass of an epoxidized natural rubber, 8 to 30% by mass of polybutadiene rubber, 20 to 70% by mass of a styrene-butadiene copolymer rubber, and 5 to 40% by mass of a conjugated diene polymer that has a constituent unit based on a conjugated diene and a constituent unit represented by formula (I) below: wherein, X 1 , X 2 , and X 3 each independently represent a hydroxyl group or a C 1-4 alkyl group at least one terminal of the conjugated diene polymer chain being modified by a compound selected from the group consisting of compounds of formula (II) wherein n is an integer from 1 to 10, R 3 , R 4 , and R 5 are each independently a C 1-3 alkyl group or a C 1-3 alkoxy group, provided that at least one of R 3 , R 4 , and R 5 is an alkoxy group, and A l is a dialkylamino group, a di(alkoxyalkyl)amino group, a di(alkylene oxide)amino group, a di(alkylene oxide alkyl)amino group, or a di(trialkylsilyl) amino group; compounds of formula (Va) wherein e represents an integer from 2 to 7 and R 11 and R 12 each independently represents a C 1-20 alkyl group; compounds of formula (VII): wherein g represents an integer from 1 to 10, R 17 is a hydrogen atom, a C 1-4 alkyl group, or a C 1-4 alkoxy group, A 3 is the group —NR 18 — wherein R 18 is a hydrogen atom or a C 1-4 alkyl group, and A 4 is a dialkylamino group, a di(alkylene oxide)amino group, a di(alkylene oxide alkyl)amino group, or a di(trialkylsilyl)amino group; compounds of formula (IXc) wherein j, k, and 1 each independently represents an integer from 1 to 10, R 32 to R 4 ° each independently represents a C 1-3 alkyl group or a C 1-3 alkoxy group, at least one of R 32 , R 33 , and R 34 is an alkoxy group, at least one of R 35 , R 36 , and R 37 is an alkoxy group, and at least one of R 38 , R 39 , and R 4 ° is an alkoxy group; and compounds of formula (XIII) wherein z represents an integer from 0 to 10, R 45 represents a C 1-4 alkyl group, R 46 , R 47 , R 48 , and R 49 each independently represents a hydrogen atom or a C 1-4 alkyl group, or a C 1-3 alkoxy group, provided that when a plurality of R 46 's are present, the plurality of R 46 's may be the same as each other or may differ from one another, and when a plurality of R 47 's are present, the plurality of R 47 's may be the same as each other or may differ from one another, and R 50 and R 51 each independently represents a C 1-4 alkyl group, wherein terminal modification of the styrene-butadiene copolymer rubber has been carried out with a compound selected from the group consisting of compounds of formula (II), compounds of formula (Va), compounds of formula (VII), compounds of formula (IXc), and compounds of formula (XIII), and wherein a total content of any carbon black and/or silica in said rubber composition is 5 to 100 parts by mass per 100 parts by mass of said rubber component.