Ethylene polymerization using crosslinked polystyrene as support for zirconocene dichloride/methylaluminoxane

Abstract

SUMMARY: In this paper we report on a zirconocene dichloride/methylaluminoxane catalyst system supported on a crosslinked polystyrene in order to provide ethylene polymerization catalysts for gas phase or slurry processes. Our novel approach uses the Diels-Alder reaction of cyclopentadiene functions as the final, crosslinking synthetic step. This provides polymer supported zirconocene catalysts with a homogeneous distribution of active sites. The catalysts were shown to be highly active and to form spherical beads as proven by scanning electron microscopy.

In situ synthesis of nanoclay filled polyethylene using polymer supported metallocene catalyst system

“…Apart from using inorganic supports like magnesium chloride, silica, alumina, TiO 2 etc, polymeric support like pentaerythritol trimethacrylate, divinyl benzene, 2-hydroxyethyl methacrylate, styrene etc have been utilized for immobilization of metallocenes. [23][24][25][26][27][28][29] Beside performing the basic role of the support like exposure of active sites, stabilization of active sites, high activity of catalyst and precise control over polymer properties, polymeric support also eliminates the side effects of inorganic support like reduction in ash content etc.…”

Cytologic features of round cell liposarcoma

“…As solid beads crosslinked with divinylbenzene (DVB), however, PS is often hindered in fragmentation. It is therefore necessary for PS to be improved to meet the requirements for metallocene supports mentioned previously 25, 26…”

α-Zirconium phosphonates as new supports for metallocene catalysts

“…However, for most industrial applications catalyst heterogenization is required [1][2][3]. Most supporting concepts for the heterogenization of metallocene catalysts use different types of amorphous silica [4][5][6][7][8], although MgCl 2 [9][10][11], alumina [12], zeolites [13,14], clays [15,16], mesoporous silicates [17][18][19][20][21] and polymers [22][23][24][25][26][27][28] have also been used. We report here the use of zirconium phosphonates as supports for metallocene catalysts.…”