发明名称 |
PROCEDIMENTO PER LA POLIMERIZZAZIONE IN FASE GAS DELLE OLEFINE |
摘要 |
Process for the gas-phase polymerization of ethylene and ethylene mixtures with alpha -olefins CH2=CHR in the presence of a high activity catalyst comprising a titanium compound containing at least one Ti-halogen bond supported on magnesium dichloride in active form, said process comprising the steps of: (a) contacting the catalyst component; (b) prepolymerizing ethylene or ethylene mixtures with alpha -olefins in order to produce a polymer amount of from approximately 5 g per g of solid component, up to an amount corresponding to about 10% of the final catalyst yield; (c) polymerizing ethylene or ethylene mixtures with alpha -olefins in the gas-phase, in the presence of the prepolymer-catalyst system obtained in (b) , while maintaining in the gas phase a molar concentration of the alkane comprised between 20 and 90 % with respect to the total gases. <IMAGE> |
申请公布号 |
IT1254279(B) |
申请公布日期 |
1995.09.14 |
申请号 |
IT1992MI00589 |
申请日期 |
1992.03.13 |
申请人 |
MONTECATINI TECNOLOGIE SPA ORA SPHERILENE S.R.L. |
发明人 |
COVEZZI MASSIMO;GALLI PAOLO;GOVONI GABRIELE;RINALDI ROBERTO |
分类号 |
C08F2/34;C08F4/60;C08F4/642;C08F4/654;C08F10/00;C08F10/02;(IPC1-7):C08F |
主分类号 |
C08F2/34 |
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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