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Rubber composition containing a carbon black particles having two modal diameters in the aggregate
| Details |
Inventors: Nakai, Kiyonari; Mito, Masahiko;
Assignee: The Tokai Carbon Co., Ltd. (Tokyo, JP)
Primary Examiner: Lilling; Herbert J.
Assistant Examiner:
Attorney, Agent or Firm: Armstrong, Nikaido, Marmelstein & Kubovcik
A rubber composition comprising 35 to 100 parts by weight of a carbon black per 100 parts by weight of a rubber component, the carbon black having a nitrogen adsorption specific surface area (N.sub.2 SA) within a range of 70 to 185 m.sup.2 /g and an aggregate characteristic which shows a first and a second modal diameters in the aggregate equivalent Stokes diameter distribution and has a difference between the two modal diameters L (nm) to be calculated from the following equation (1) which satisfies the following formula (2): L=Dst.sub.2 -Dst.sub.1 (1) 20.ltoreq.L.ltoreq.110-0.3 (N.sub.2 SA) (2) wherein Dst.sub.1 and Dst.sub.2 respectively denote the first modal diameter (nm) and the second modal diameter (nm) in the aggregate equivalent Stokes diameter distribution detetermined by a centrifugal classification method. |
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DETAILED DESCRIPTION Above indicated inconveniences and difficulties in the prior art can be obviated if, with use of a carbon black having a relatively small particle diameter (or a relatively large specific surface area), it can be attained to improve the ease of dispersion of the carbon black in a rubber component and the processability in the preparation of a rubber composition and eventually provide a rubber composition imparted with a high abrasion resistance and a low heat generating propensity, at the same time.
It then is feasible to provide a rubber composition having ideal rubber characteristics for a tire tread rubber.
Thus, with an attention paid particularly to characteristics of carbon blacks, the inventors of the present invention have variously attempted to improve the above referred-to contradictory performance characteristics of rubber compositions, namely the abrasion resistance and the ease of dispersion and the processability, and as a result of this, have ascertained that a rubber composition blended therein with such a carbon black as having a relatively broad aggregate size distribution while it has a fine particle diameter is suitable for use for the tread of large-size tires.
Also, as a result of a further series of studies made also by the present inventors, it has been ascertained that a rubber composition suitable for a tire tread rubber can be provided by blending in a rubber component such a carbon black as having two modal diameters within a particular range in the aggregate equivalent Stokes diameter distribution.
As can be seen from the above, it is the primary object of the present invention to provide a rubber composition having effectively improved performance characteristics with respect to the result of reinforcement by a carbon black, represented by a high abrasion resistance, and the dynamic characteristics such as a low heat generating propensity and a high resilience.
The above object of the present invention can be attained according to the present invention by providing a rubber composition which comprises 35 to 100 parts by weight of a carbon black per 100 parts by weight of a rubber component, the carbon black having a nitrogen adsorption specific surface area (N
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