RUBBER COMPOSITION AND PNEUMATIC TIRE PRODUCED THEREFROM

• Main Authors: ARAKI SHUNJI, YANAGISAWA KAZUHIRO
• Format: Patent
• Language: English
• Published: 06.07.1999
• Edition: 6
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; DEVICES OR ARRANGEMENTS RELATED TO TYRES; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; REPAIRING, OR CONNECTING VALVES TO, INFLATABLE ELASTIC BODIESIN GENERAL; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; TYRE CHANGING OR REPAIRING; TYRE INFLATION; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; VEHICLE TYRES; VEHICLES IN GENERAL

PROBLEM TO BE SOLVED: To obtain a rubber compsn. which is excellent in workability and gives a pneumatic tire improved in abrasion resistance, grip properties, and uniformity by compounding a specific copolymer rubber, another diene rubber, silica, a carbon black, and a silane coupling agent. SOLUTION: This compsn. is prepd. by compounding (A) 100 pts.wt. rubber blend comprising 55 pts.wt. or higher copolymer rubber having a glass transition point of -40 deg.C or lower and a vinyl content of butadiene parts of 15-70% and obtd. by copolymerizing 30-40 wt.% styrene and 1,3-butadiene in the presence of an organolithium compd. and 45 pts.wt. or lower other diene rubber with (B) 20-100 pts.wt. silica, (C) 0-100 pts.wt. carbon black, and (D) a silane coupling agent which is represented by the formula (wherein (n) is 1-3; (m) is 1-9; and (y) is 1 or higher) and has a trisulfide silane content (based on the total polysulfide silane content) of 25% or higher and a content of higher polysulfide silanes (having (y) of 5 or higher) of 50% or lower, the amt. of D being 1-20 wt.% of B and the wt. ratio of B/C being (1/1)-(1/0).