发明名称 |
Method of copolymerization in suspension of ethylene with straight-chain alpha-olefins to obtain low-density copolymers |
摘要 |
A method of copolymerization in suspension of ethylene with straight-chain alpha-olefins so as to obtain low-density copolymers in two copolymerization steps in an aliphatic hydrocarbon medium having a boiling point above 40 DEG C. In the first reaction step the medium is supplied with a high-activity Ziegler catalyst on a carrier and with ethylene and the alpha-olefin. The copolymerization reaction is carried out for between 20 seconds and 30 minutes and at a temperature between 45 DEG and 65 DEG . The resulting copolymer is used in the second reaction step as a nucleus for polymerizing ethylene and the alpha-olefin, the reaction medium being supplied with additional quantities of ethylene and alpha-olefins so as to maintain the concentration of alpha-olefin in the reaction medium at between 4 and 25% by weight per 100 parts by weight of reaction medium and so as to maintain the pressure of ethylene at between 5 and 25 bars, the reaction being performed at a temperature between 50 DEG and 80 DEG C. for between 1 and 3 hours.
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申请公布号 |
US4530980(A) |
申请公布日期 |
1985.07.23 |
申请号 |
US19840579052 |
申请日期 |
1984.02.10 |
申请人 |
SIR SOC ITALIANA RESINE SPA;ENICHIMICA SECONDARIA S.P.A |
发明人 |
RADICI, PIERINO |
分类号 |
C08F2/00;C08F2/14;C08F2/18;C08F210/00;C08F210/02;C08F210/16;C08F297/08;(IPC1-7):C08F2/00 |
主分类号 |
C08F2/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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