Modified conjugated diene polymer and method of producing the same and rubber composition
AssigneesJsr Corporation, Bridgestone Corporation
InventorsTakuo Sone, Ryouji Tanaka, Kouichirou Tani, Iwakazu Hattori, Hiroshi Akema, Atsushi Nakayama
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Abstract
A novel modified conjugated diene polymer is obtained by polymerizing a conjugated diene compound with a specified catalyst consisting of components (a)-(c) and then reacting with at least one specified compound selected from the group consisting of components (d)-(l), and has a content of cis-1,4-bond of not less than 85% and a ratio of weight average molecular weight to number average molecular weight of not more than 4. And also, a rubber composition comprises the modified conjugated diene polymer a rubber ingredient.
Claims4
A terminal-modified conjugated diene polymer obtained by modifying or coupling a conjugated diene polymer with at least one compound selected from the group consisting of the following components (d), (e), and (f), and having a content of cis-1,4-bond in a conjugated diene portion of not less than 85% and a ratio of weight average molecular weight (Mw) to number average molecular weight (Mn) of not more than 4 as measured through a gel permeation chromatography:
- Component (d):
- a quinone compound;
- Component (e):
- a thiazole compound;
- and
- Component (f):
- a sulfenamide compound.
A rubber composition comprising 20-120 parts by weight of carbon black based on 100 parts by weight of rubber ingredient consisting of 10-100% by weight of a terminal-modified conjugated diene polymer as claimed in any one of claims 1 and 2 to 3 and 90-0% by weight of at least one other rubber selected from the group consisting of natural rubber, synthetic isoprene rubber, butadiene rubber, styrene-butadiene rubber, ethylene-α-olefin copolymer rubber, ethylene-α-olefin-diene terpolymer rubber, acrylonitrile-butadiene copolymer rubber, chloroprene rubber and halogenated butyl rubber (provided that the modified conjugated diene rubber+the other rubber=100% by weight).
Dependencies are inferred from the claim text.