申请人:Marin Vladimir
公开号:US20050148460A1
公开(公告)日:2005-07-07
Catalyst compositions and processes for the polymerization of ethylenically unsaturated monomers to produce polymers specific to the polymerization of propylene to produce isotactic polypropylene and copolymer, specifically an ethylene-propylene copolymer. An olefin polymerization catalyst is characterized by the formula:
B(FluA)MQ
n
wherein Flu is a fluorenyl group substituted at the 4(5) position by a bulky hydrocarbyl group having at least 3 carbon atoms, A is a substituted or unsubstituted cyclopentadienyl or indenyl group or a heteroorgano group, XR, in which X is a heteroatom from Group 15 or 16 such as nitrogen. R is an alkyl group or cycloalkyl group or a mononuclear aromatic group which may be substituted or unsubstituted. B is a structural bridge which imparts stereorigidity to the ligand structure. The bridge B is characterized by the formula ER′R″, in which E is a carbon, silicon or germanium atom, and R′ and R″ are each independently an alkyl group, an aromatic group or a cycloalkyl group. M is a Group 4 or Group 5 transition metal such as titanium, zirconium or hafnium. Q is chlorine, bromine, iodine, an alkyl group, an amino group or an aromatic group. n is 1 or 2. The fluorenyl group may be substituted at both of the 4 or 5 positions with a bulky hydrocarbyl group containing at least 3 carbon atoms. A may take the form of an indenyl group which is substituted or unsubstituted, or a cyclopentadienyl group which is substituted at the 3 or the 3 and 5 positions. The fluorenyl group may be mono-substituted at the 4 (or 5) position and is otherwise unsubstituted or is di-substituted at the 2,7 positions with alkyl or phenyl or substituted phenyl groups.
催化剂组合物和用于聚合乙烯不饱和单体以产生特定于聚丙烯聚合的聚合物以及共聚物的过程,特别是乙烯-丙烯共聚物的过程。烯烃聚合催化剂的特征是以下公式:B(FluA)MQn,其中Flu是在4(5)位置被至少具有3个碳原子的笨重烃基取代的芴基团,A是取代或未取代的环戊二烯基或茚基团或杂原有机基,XR,其中X是来自第15或16族的氮等杂原子。R是烷基或环烷基或可能是取代或未取代的单核芳基。B是一种结构桥,赋予配体结构立体刚性。桥B的特征是以下公式ER′R″,其中E是碳、硅或锗原子,R′和R″各自独立地是烷基、芳基或环烷基。M是第4或第5族过渡金属,如钛、锆或铪。Q是氯、溴、碘、烷基、氨基或芳基。n为1或2。芴基团可以在4或5位置都被至少含有3个碳原子的笨重烃基取代。A可以采取取代或未取代的茚基,或者在3或3和5位置取代的环戊二烯基的形式。芴基团可以在4(或5)位置被单取代,否则未取代或在2,7位置与烷基或苯基或取代苯基团二取代。