Process for the preparation of high purity propylene polymers

US10221261B2 · kind B2 · utility

Assignee

• Basell Poliolefine Italia S.r.l. · IT

Inventors

• Monica Galvan · Ferrara, IT
• Roberto Pantaleoni · Ferrara, IT
• Ofelia Fusco · Ferrara, IT
• Benedetta Gaddi · Ferrara, IT
• Andreas Neumann · Ferrara, IT
• Antonio Mazzucco · Ferrara, IT
• Gianni Collina · Cassana, IT
• Gabriella Sartori · Ferrara, IT

Key dates

• Filing date: Sep 17, 2012
• Grant date: Mar 5, 2019
• Expiry date: Feb 7, 2033

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2323/14
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for the preparation of high purity propylene polymers carried out in the presence of a catalyst comprising the product obtained by contacting:(a) a solid catalyst component comprising Mg, Ti and at least a first internal electron donor compound (1ID) selected among the succinates and a second internal electron donor compound (2ID) selected among the 1,3-diethers, wherein the molar ratio of first internal donor over second internal donor 1ID:2ID is comprised between 4:6 and 9:1, with (b) an organo-aluminum compound, and optionally with (c) an external electron donor compound, said process being carried out at a temperature equal or higher than 78° C. and by employing a molar ratio of organo-aluminum compound over solid catalyst component (b):(a) of lower than 5.