Catalyst composition for preparing high-syndiotactivity polystyr

Details Catalyst composition for preparing high-syndiotactivity polystyr Catalyst composition for preparing high-syndiotactivity polystyr

1997-08-04

1999-06-22

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526127, 526132, 526133, 526150, 526151, 526161, 5263472, 502118, 502128, 502129, 502131, 502153, 502158, C08F 4643, C08F 1208

Patent

active

059143754

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, R.sub.4 and R.sub.5 can be, independently, alkyl group, aryl group, silyl group, germanyl group, stannyl group, hydrogen atom, or halogen atom; R is an alkyl group, aryl group, hydrogen atom, or halogen atom; 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 acid (a Lewis acid is an electron-pair donor) and a trialkyl aluminum, such as triethyl aluminum or tetraisobutyl aluminum. R.sub.1 and R.sub.2 and R.sub.3 and R.sub.4, respectively, can also be part of a benzene ring.

REFERENCES:
patent: 5276115 (1994-01-01), Bohmer et al.
patent: 5331071 (1994-07-01), Kataoka et al.
patent: 5393911 (1995-02-01), Patsidis et al.
patent: 5644009 (1997-07-01), Tsai et al.
patent: 5670588 (1997-09-01), Tajima et al.

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