Polybutadiene
AssigneeUbe Industries, Ltd.
InventorsMitsuharu Ambe, Yuuto Kanou, Takeshi Shoda
Life of this patent
Estimating the term…
Abstract
The present invention provides a polybutadiene having improved workability and abrasion resistance. A polybutadiene according to the present invention has: (A) a Mooney viscosity (ML1+4,100° C.) being 43 or more; (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 2.3; (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%; and (D) a molecular weight distribution (Mw/Mn) being 2.50 to 4.00.
Claims2
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 26.0 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 %.
Dependencies are inferred from the claim text.