| 摘要 |
Provided is a rubber composition obtained by blending silica (B) and an alkoxysilane compound (C) with a rubber component containing a cyclic olefin-based rubber (A). The rubber composition is characterized in that: the cyclic olefin-based rubber (A) has a functional group at a polymer chain end, has a weight average molecular weight of 100,000 to 800,000, and has a toluene-insoluble quantity of less than 5 wt%; the blending quantity of the silica (B) is 30 to 150 parts by weight with respect to 100 parts by weight of the rubber component; the alkoxysilane compound (C) has a group able to react with the functional group of the polymer chain end of the cyclic olefin-based rubber (A), and the blending quantity of the alkoxysilane compound (C) is 0.01 to 20 parts by weight with respect to 100 parts by weight of the rubber component. |
