VERFAHREN ZUR HERSTELLUNG VON LINEAREM POLYETHYLEN VON NIEDRIGER ODER MITTLERER DICHTE.
摘要
Low or medium-density straight-chain ethylene polymers are prepared by copolymerising ethylene with a C4-C6 alpha-olefin at elevated temperature and pressure in a tubular reactor and in the presence of a Ziegler-type catalyst comprising a trialkyl aluminum as co-catalyst and a solid component, the solid component being obtained: - by spray-drying an ethanolic solution of magnesium chloride to obtain a solid substrate of magnesium chloride particles containing alcoholic hydroxylis, - by reacting the substrate with titanium tetrachloride to form an activated substrate, and - by reacting the activated substrate with an alkyl aluminium chloride to chlorinate the titanium and partially or completely reduce the titanium from the tetravelent to the trivalent state.
申请公布号
DE3763196(D1)
申请公布日期
1990.07.19
申请号
DE19873763196
申请日期
1987.04.16
申请人
ENICHEM BASE S.P.A., PALERMO, IT
发明人
MIRRA, MAURO, I-13051 BIELLA-VERCELLI, IT;MASI, FRANCESCO, I-20097 S. DONATO MILANESE MILAN, IT;INVERNIZZI, RENZO, I-20147 MILAN, IT;BANI, ANTONIO, I-20135 MILAN, IT