Dario Liguori

Bio: Dario Liguori is an academic researcher from University of Salerno. The author has contributed to research in topics: Polymerization & Catalysis. The author has an hindex of 9, co-authored 29 publications receiving 455 citations. Previous affiliations of Dario Liguori include University of Naples Federico II.

Catalyst components for the polymerization of olefins

Abstract: Catalyst components for the(co)polymerization of ethylene comprising Ti, Mg, halogen, ORI groups, where RI is a C1-C12 hydrocarbon group optionally containing heteroatoms, having ORI/Ti molar ratio in the range 0.1-1.5, a Mg/Ti molar ratio of less than 8, an amount of titanium, with respect to the total weight of said solid catalyst component, higher than 4% by weight characterized by a specific SS-NMR pattern are particularly useful for preparing narrow MWD crystalline ethylene polymers.

Toward a Unified Model Explaining Heterogeneous Ziegler–Natta Catalysis

Abstract: We propose a model for MgCl2-supported Ziegler–Natta catalysts, which is capable to reconcile the discrepancies emerging in the last 20 years, in which attempts have been made to rationalize experimental data by molecular models. We show that step defects on the thermodynamically more stable (104) facet of MgCl2 can lead to sites for strong TiCl4 adsorption. The corresponding Ti-active site is stereoeselective, and its stereoselectivity can be enhanced by coordination of Al-alkyls or Lewis bases in the close proximity. The surface energy of the step defected (104) MgCl2 facet is clearly lower than that of the well accepted (110) facet.

Magnesium chloroakolate-based catalyst precursors

Abstract: Catalyst precursors comprising Mg, Cl, Ti, and OR groups that are in molar ratios defined by the formula MgClnTip(OR)(2-n)+4p in which n is from 0.3 to less than 1.7, p is lower than 0.6, the molar ratio (OR)/Cl is lower than 4 and R is Cl -C15 hydrocarbon groups. The said precursor, just upon activation with organo-Al compounds, are able to advantageously polymerize ethylene and alpha olefins, and that upon reaction with halogenating compounds generate in high yields catalyst components with high polymerization activity particularly in the polymerization of propylene also in combination with 1,3-diethers.

Titanium Monoamidinate−MAO Catalysts: Some Information about Active Species and Stereochemical Polymerization Mechanisms

Abstract: This paper reports stereospecific polymerization of propene, 1,3-butadiene, and styrene, in the presence of titanium trichloroamidinate/MAO catalysts, under different reaction conditions. Comparison of the structures of the polymers obtained at different temperatures provides some information about the active species involved in promoting the stereospecific polymerizations of the different monomers.

Low-Temperature Polymerization of Olefins in the Presence of Titanium Monoamidinate/MAO Catalyst

Abstract: This paper reports the predominantly syndiotactic-specific polymerization of propylene in the presence of titanium monoamidinate/methylaluminoxane (MAO) catalysts. The same catalysts, depending on the reaction conditions, also promote either predominantly 1,4-cis or 1,4-trans polymerization of 1,3-butadiene and polymerization of styrene either to highly syndiotactic or to stereoirrgular polymer. Some preliminary information about the features of propylene polyinsertion is also reported

From Multisite Polymerization Catalysis to Sustainable Materials and All-Polyolefin Composites

Abstract: All-Polyolefin Composites Markus Stürzel,† Shahram Mihan,‡ and Rolf Mülhaupt*,†,§ †Freiburg Materials Research Center (FMF) and Institute for Macromolecular Chemistry, Albert-Ludwigs-University Freiburg, Stefan-Meier-Strasse 31, D-79104 Freiburg, Germany ‡Basell Polyolefine GmbH, Catalyst Systems, Industriepark Hoechst, D-65926 Frankfurt am Main, Germany Sustainability Center Freiburg, Ecker-Strasse 4, D-79104 Freiburg, Germany

Polyolefin adhesive compositions and articles made therefrom

Abstract: Embodiments of the present invention relate to article comprising 1) a functionalized component, 2) tackifier, and 3) an olefin polymer comprising one or more C3 to C40 olefins, optionally one or more diolefins, and less than 5 mole % of ethylene having a Dot T-Peel of 1 Newton or more, a branching index (g′) of 0.95 or less measured at the Mz of the polymer; and an Mw of 100,000 or less; where the functional component is selected from the group consisting of functionalized polymers, functionalized oligomers and beta nucleating agents; and where the Gardner color of the adhesive does not change by more than 7 Gardner units when the adhesive has been heat aged at 180° C. for 48 hours as compared to the Gardner color of the unaged composition.

Catalyst components for the polymerization of olefins

Abstract: Catalyst components for the(co)polymerization of ethylene comprising Ti, Mg, halogen, ORI groups, where RI is a C1-C12 hydrocarbon group optionally containing heteroatoms, having ORI/Ti molar ratio in the range 0.1-1.5, a Mg/Ti molar ratio of less than 8, an amount of titanium, with respect to the total weight of said solid catalyst component, higher than 4% by weight characterized by a specific SS-NMR pattern are particularly useful for preparing narrow MWD crystalline ethylene polymers.