The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 01, 1997
Filed:
Nov. 27, 1995
Jing-Cherng Tsai, Hsinchu, TW;
Shian-Jy Wang, Hsinchu, TW;
Shu-Ling Peng, Hsinchu, TW;
Mickey Sue, Taipei, TW;
Industrial Technology Research Institute, Hsinchu, TW;
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.