PURPOSE: To obtain a rubber composition having excellent extrusion moldability and vulcanizability, by kneading a vulcanized rubber compounding ingredient to an ethylene-α-olefin copolymer rubber having a bimodal molecular weight distribution and produced by the use of a specific catalyst component.
CONSTITUTION: The objective rubber composition can be produced by compounding (A) a vulcanized rubber compounding ingredient to (B) an ethylene-α-olefin(-nonconjugated diene) copolymer rubber having a bimodal molecular weight distribution characterized in that the content of the low- molecular weight component A is 10W50wt% (defined by the formula wherein W1 is the area of low molecular weight side; W2 is area of high molecular weight side) and a ratio of (weight-average molecular weight)/(number-average molecular weight) of 5W25, and produced by a single-stage polymerization process using a catalyst compound of (i) a reaction product of a vanadium compound (preferably vanadium oxytrichloride) and a secondary alcohol (preferably 3W12C aliphatic alcohol) and/or its metal salt and (ii) an organic aluminum compound.
WATANABE MASARU
NAKAMURA TOSHIBUMI
MAKINO KENYA
| JPS5415472A | 1979-02-05 | |||
| JPS614708A | 1986-01-10 | |||
| JP59125896Y | ||||
| JPS5533764A | 1980-03-10 |
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