Ethylene polymerization and copolymerization reactions with Ti(OR)4 – Al2(C2H5)3Cl3/Mg(C4H9)2 catalyst

• Published in: Polymer international Vol. 69; no. 12; pp. 1207 - 1212
• Main Authors: Rishina, Laura А, Kissin, Yury V, Lalayan, Svetlana S, Krasheninnikov, Vadim G
• Format: Journal Article
• Language: English
• Published: Chichester, UK John Wiley & Sons, Ltd 01-12-2020; Wiley Subscription Services, Inc
• Subjects: Aromatic hydrocarbons; Catalysts; Chemical synthesis; Copolymerization; Copolymers; DSC analysis; ethylene; GPC analysis; Polyethylene; Polyethylenes; Polymerization; Propylene; Ziegler catalyst
• ISSN: 0959-8103; 1097-0126
• DOI: 10.1002/pi.6063

The ternary Ti(Oiso‐C3H7)4–Al2(C2H5)3Cl3/Mg(C4H9)2 catalyst polymerizes ethylene and copolymerizes it with 1‐hexene but does not polymerize propylene. The catalyst contains several types of active centers with different kinetic parameters; they produce polymer components with different average molecular weights. The centers have similar reactivities in ethylene/1‐hexene copolymerization reactions and produce copolymers with a relatively uniform compositional distribution. The catalyst can be used for synthesis of ethylene/1‐alkene copolymers of the linear low‐density polyethylene type. The principal advantages of the catalyst are high activity, stable kinetic behavior, low cost of all components and the ease of use: the catalyst is prepared in situ from three commercially available compounds readily soluble in aliphatic and aromatic hydrocarbons. © 2020 Society of Chemical Industry
DSC curves of polyethylene (1) and ethylene/1‐hexene copolymer containing 1.9 mol % of 1‐hexene (2).