Catalyst composition for preparing high syndiotacticity polystyr

Details Catalyst composition for preparing high syndiotacticity polystyr Catalyst composition for preparing high syndiotacticity polystyr

1995-11-27

1997-07-01

Teskin, Fred

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526115, 526127, 526133, 526144, 526150, 526151, 526161, 5263472, 502102, 502103, 502113, 502118, 502124, 502128, 502129, 502131, 502158, C08F 4642, C08F 1208

Patent

active

056440090

ABSTRACT:
An catalyst composition for preparing high-syndiotacticity polystyrene polymers which comprises: (a) a titanium complex represented by the following formula of TiR'.sub.1 R'.sub.2 R'.sub.3 R'.sub.4 or TiR'.sub.1 R'.sub.2 R'.sub.3, wherein R'.sub.1, R'.sub.2, R'.sub.3, and R'.sub.4 are, independently, an alkyl group, an aryl group, an alkoxy group, an aryloxy group, an amino group, a hydrogen atom, or a halogen atom; (b) a cyclopentadienyl complex of silicon (Si), germanium (Ge), or tin (Sn) represented by the following formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are, independently, an alkyl group, an aryl group, a silyl group, a germanyl group, a stannyl group, or a halogen atom; R is an alkyl group, aryl group, a hydrogen atom, or a halogen element; and X can be one of the Group IVA elements of silicon (Si), germanium (Ge), or tin (Sn); and (c) an activated transitional metal co-catalyst, which can be methyl aluminoxane, or a mixture containing a non-coordinated Lewis add (a Lewis acid is an electron-pair donor) and a trialkyl aluminum, such as triethyl aluminum or tetraisobutyl aluminum.

REFERENCES:
patent: 4774301 (1988-09-01), Campbell et al.
patent: 4808680 (1989-02-01), Schmidt et al.
patent: 5276115 (1994-01-01), Bohmer et al.
patent: 5451555 (1995-09-01), Tajima et al.
patent: 5461128 (1995-10-01), Takeuchi et al.

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