Alkoxy Silanes as External Donors for Polypropylene Procatalyst: Study on Polymerization Performance and Effect on Resin Properties

Highly efficient FeCl3 doped Mg(OEt)2/TiCl4-based Ziegler–Natta catalysts for ethylene polymerization

“…[8,9] Industrial catalysts precursors containing magnesium compounds such as MgCl 2 or Mg(OEt) 2 in conjunction with TiCl 3 or TiCl 4 showed great performance in olefin polymerization; however, still there are lots of modifications of ZN catalysts varying in the way of preparation of the support [10][11][12][13][14] and differences in the active component compound structure and the presence of various modifying additives. [15][16][17][18] Lately, investigations have shown that doping a suitable amount of Lewis acids in MgCl 2 or Mg(OEt) 2 supports would be an effective way to improve their catalytic performance in α-olefin polymerization. The mostly used doping agents were based on different metal halides such as MnCl 2 , [2] ZnCl 2 , [3] NaCl, [4] AlCl 3 [5,6,19], and the mixture of metal halide with metalloids like ZnCl 2 -SiCl 4 system.…”

Stabilized polypropylene synthesis using supported titanium catalyst system in presence of phenolic compounds

“…[29] The Molecular weight distributions (MWD) were determined using Polymer Laboratories PL-GPC220 High Temperature Gel Permeation Chromatograph. [5] Pentad distribution (mmmm content) was measured through 13 C { 1 H} NMR experiments on Bruker Avance-II 400 MHz NMR instrument. [30] Xylene soluble (II) was measured as per the standard ASTM method.…”

“…[5] The masked and unmasked phenolic compounds were used by mixing them with catalyst before the polymerization. The masking of 4, 4′-methylenebis(2, 6-di-tert-butylphenol) was carried out by reaction of 0.2 g (0.47 mmol) with 0.11 g (0.94 mmol) TEA in 100 mL hexane.…”

“…[26] Continuous improvements in the efficiency and economic cost of traditional phenolic and phosphate-based antioxidants have provided an edge over other class of antioxidants for industrial use. Our interest in the development of morphology-controlled magnesium dichloride-supported titanium tetrachloride catalyst technology for polypropylene [5,27] prompted us to also study the propylene polymerization process in presence of masked phenolic compounds which are structurally simple and easily available to produce inreactor stabilized polypropylene resin. Furthermore, the chemical structure-performance relationship studies are carried out for understanding the impact of structural features of phenolic compounds on catalyst activity and stereospecificity along with polymer characteristics and antioxidant efficacy.…”

“…[1][2][3][4][5] Major improvement in catalyst technology is centered on development of shape-and size-controlled magnesium dichloridesupported titanium catalyst using internal and external donor modifications. [6][7][8][9][10][11][12] These catalyst systems produce polypropylene and its copolymer resin using slurry, bulk, and gas phase polymerization technology with high productivity, controlled stereospecificity, and improved morphological characteristics.…”