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POLYBUTADIENE

  • US 20170015766A1
  • Filed: 02/19/2015
  • Published: 01/19/2017
  • Est. Priority Date: 03/31/2014
  • Status: Active Grant
First Claim
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1. A polybutadiene, which is produced by using a cobalt catalyst, having:

  • (A) a Mooney viscosity (ML1+4,100°

    C.
    ) being 43 to 70;

    (B) a ratio (Tcp/ML1+4,100°

    C.
    ) of 5 wt % toluene solution viscosity (Tcp) to Mooney viscosity (ML1+4,100°

    C.
    ) being 0.9 to 1.7;

    (C) a stress relaxation time (T80) being 10.0 to 40.0 seconds, which is a time until a torque is attenuated by 80% when the torque at the end of ML1+4,100°

    C.
    measurement is 100%;

    (D) a molecular weight distribution (Mw/Mn) being 2.50 to 4.00; and

    (F) a ratio of cis-structure in microstructural analysis being 94.0 to 98 mol %.

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