Butadiene-based polymer and method of producing the same as well as rubber composition and tire using the same
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United States of America Patent
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Apr 6, 2010
Grant Date -
Mar 8, 2007
app pub date -
Jun 23, 2004
filing date -
Jun 25, 2003
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Abstract
This invention is concerned with a butadiene-based polymer having a high cis-1,4 bond content, a low vinyl bond content and a molecular weight distribution of a specified range, and more particularly a butadiene-based polymer having a 1,3-butadiene monomer unit, characterized in that a cis-1,4 bond content and a vinyl bond content in the 1,3-butadiene monomer unit as measured by a Fourier transform infrared spectroscopy (FT-IR) is not less than 98.0% and not more than 0.3%, respectively, and a ratio (Mw/Mn) of weight average molecular weight (Mw) to number average molecular weight (Mn) is 1.6-3.5.
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