Process for preparation of syndiotactic vinyl aromatic polymers
US5066741A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 30, 1990 |
| Grant date | Nov 19, 1991 |
| Priority date | — |
| Expiry date | Jul 30, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/943
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for preparing syndiotactic vinyl aromatic polymers comprising contacting one or more aromatic monomers under polymerization conditions with a catalyst corresponding to the formula: EQU [Cp.sub.m MX.sub.n X'.sub.p ].sup.+ A.sup.- wherein: PA1 Cp is a single .eta..sup.5 -cyclopentadienyl or .eta..sup.5 -substituted cyclopentadienyl group; PA1 M is a metal of Group 3, 4, 5, 6, 8, 9, 10 or the Lanthanide Series of the Periodic Table; PA1 X each occurrence is an inert anionic ligand, with the proviso that at least one X is R; PA1 X' is an inert, neutral, donor ligand; PA1 R is hydride hydrocarbyl, silyl, a combination thereof or a substituted derivative thereof having up to 20 carbon, silicon or carbon and silicon atoms; PA1 m and p are independently 0 or 1; PA1 n is an integer greater than or equal to 1; PA1 the sum of m and n is equal to the valence of M; and PA1 A.sup.- is a noncoordinating, compatible anion of a Bronsted acid salt.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.