Catalyst system for producing ethylene (co) polymer with improved branch distribution
申请人:Kong Gapgoung
公开号:US20080132406A1
公开(公告)日:2008-06-05
A process for synthesizing a catalyst component for manufacturing ethylene polymer and co-polymer. The present invention provides a process for synthesizing catalyst component (A), comprising forming a complex by contacting the solid intermediate (B) with an aluminum compound represented by formula X
3-n
Al(OY)
n
, and alkyl metal (C), wherein X is halide, Y is a hydrocarbon group or chelating carbonyl group, and wherein 1 is less than or equal to n which is less than or equal to 3, and then contacting the complex with titanium halide having formula TiX
4
wherein X is halide. Solid intermediate (B) is formed by reacting magnesium metal with alkyl halide in the presence of alkoxy aluminum represented by formula Al(OR
a
)
3
, silicon halide represented by formula SiX
4
and alkoxy silane represented by formula Si(OR
b
)
4
, wherein R
a
and R
b
are an aromatic or aliphatic alkyl group and wherein X is halide. Alkyl metal (C) is synthesized by reacting alkyl aluminum compounds represented by formula AlR
c
3
with a secondary amine having formula HNR
d
2
and then by reacting with alkyl magnesium compounds represented by formula R
e
MgR
f
, wherein R
c
, R
d
, Re and R
f
are an aromatic or aliphatic alkyl group. The catalyst component is suitable for producing ethylene polymer and co-polymer with narrow molecular weight distribution as well as improved branching compositional distribution.