发明名称 |
Process for preparing propylene block copolymers. |
摘要 |
<p>In a two-step polymerization of propylene under the catalysis by a Ziegler catalyst comprising (A) a titanium-containing solid catalyst component such as that based on TiCl3 or TiCl4 preferably supported on a magnesium compound and (B) an organoaluminum component wherein a crystalline propylene polymer is prepared in the first step and a rubbery propylene copolymer is prepared in the second step thereby to produce a propylene block copolymer or a chemically blended propylene polymer, the improvement which comprises the use as the titanium-containing solid catalyst of that which has undergone a preliminary polymerization of a diolefin compound of 4 to 18 carbon atoms polymerized thereon. Tackiness of propylene block copolymers or chemically blended propylene polymers which is likely to accompany such polymers is reduced.</p> |
申请公布号 |
EP0482855(A2) |
申请公布日期 |
1992.04.29 |
申请号 |
EP19910309688 |
申请日期 |
1991.10.21 |
申请人 |
MITSUBISHI PETROCHEMICAL COMPANY LIMITED |
发明人 |
FUJITA, TAKASHI;ISHII, KOHICHIROH |
分类号 |
C08F4/60;C08F4/642;C08F4/646;C08F297/08 |
主分类号 |
C08F4/60 |
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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