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US 9,540,464 B2Granted
Polymer and method for producing same, rubber composition containing polymer, and tire having rubber composition
AssigneeBridgestone Corporation
InventorsJunko Matsushita, Shojiro Kaita, Satoru Tamaki
Life of this patent
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Abstract
The polymer of the present invention is a synthesized polyisoprene or an isoprene copolymer. The polymer has a number average molecular weight (Mn) of 1.5 million or more when measured by using gel permeation chromatography (GPC).
Claims8
A polymer being a synthesized polyisoprene, the polymer having a number average molecular weight (Mn) of 1.5 million or more when measured by gel permeation chromatography (GPC), and
- wherein 3,4-vinyl bond content of the synthesized polyisoprene is 2% or less, and
- wherein the polymer contains a catalyst residue in an amount of 300 ppm or less.
Dependencies are inferred from the claim text.