| 摘要 |
PURPOSE:To prepare an addition polymer having an excellent heat resistance, by polymerizing a product obtd. by the heat treatment of dicyclopentadienes and ethylene in the presence of a Ziegler catalyst. CONSTITUTION:A dicyclopentadiene is submitted to heat treatment in the presence of an antioxidant, if necessary, in an inert gaseous atmosphere at 120-250 deg.C for 0.5-20hr to give a product A which is waxy with a coagulating point of 100 deg.C or lower, or which is oily with a viscosity of 200cps (at 30 deg.C). The component A and ethylene B in a molar ratio of B to A of 95-0/5-100 are polymerized in the presence of a Ziegler catalyst C consisting of a transition metal compd., such as a Ti compd., a Ti compd. supported on an Mg compd. or a V compd., and a reducing agent, such as an alkylaluminum compd., in a hydrocarbon medium under a pressure of 0-50kg/cm<2> at -50-300 deg.C to give an addition polymer. This polymer is hydrogenated, if necessary, in the presence of a hydrogenation catalyst.
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