| 摘要 |
PCT No. PCT/JP85/00652 Sec. 371 Date Jul. 28, 1986 Sec. 102(e) Date Jul. 28, 1986 PCT Filed Nov. 25, 1985 PCT Pub. No. WO86/03207 PCT Pub. Date Jun. 5, 1986.The present invention relates to an improved process for the preparation of an ethylene copolymer. In the copolymerization of a comonomer copolymerizable with ethylene and ethylene at a pressure of 500 to 3,000 kg/cm2 and at a temperature of 100 DEG to 350 DEG C. using an initiator in the presence or absence of a chain transfer agent, a gap between a packing and a retainer of an ultrahigh pressure pump for copolymerization is filled with a grease containing a polymerization inhibitor. The comonomer and a part or the whole of ethylene are mixed under an elevated pressure and then introduced into a reaction vessel. In accordance with the present invention, leakage of the comonomer from the packing of the pump, clogging of a conduit and breakage of the pump can be prevented, thus improving operation efficiency. Furthermore, the effect of diffusion of the comonomer into ethylene gas is attained sufficiently, thus enabling the production of a high-quality polymer having less gel content. This facilitates the reaction control, improving the reaction stability. |
