Magnesium dichloride-alcohol adducts and catalyst components obtained therefrom

Patent metadata

Field	Value
Publication number	US-10377839-B2
Application number	US-201314419446-A
Country	US
Kind code	B2
Filing date	Aug 1, 2013
Priority date	Aug 3, 2012
Publication date	Aug 13, 2019
Grant date	Aug 13, 2019

Abstract

Solid adducts comprising MgCl2, ethanol and water characterized in that the amount of ethanol ranges from 50% to less than 57% by weight, the amount of water is ranges from 0.5 to 5% by weight, the ethanol/water weight ratio is lower than 60 and the porosity determined with Hg method due to pores with radius up to 1 μm and expressed in cm3/g, is lower than 0.2.

First claim

What is claimed is:

1. A catalyst precursor comprising a solid adduct comprising MgCl 2 , ethanol and water, wherein the amount of ethanol ranges from 52-55% by weight, with respect to the adduct, the amount of water ranges from 0.5-5% by weight, with respect to the adduct, the ethanol/water weight ratio is less than 60 and the porosity of the adduct determined with the Hg method due to pores with radii up to 1 μm and expressed in cm 3 /g, is lower than 0.1;
wherein the catalytic precursor has a main melting temperature peak of about 97±1° C. and a highest temperature peak of less than 108° C. as determined using differential scanning calorimetry (DSC).

2. A catalyst component comprising the catalyst precursor of claim 1 , wherein the catalyst component is obtained by reacting the catalyst precursor with a transition metal compound of one of the groups IV to VI of the Periodic Table of Elements.

3. The catalyst component of claim 2 , wherein the component is reacted with an Al-alkyl compound, optionally in the presence of an external electron donor compound.

4. The catalyst component of claim 3 , wherein the Al-alkyl compound is triethylaluminum.

5. The catalyst component of claim 3 , wherein the external electron donor compound is cyclohexylmethyldimethoxysilane.

Assignees

• Basell Poliolefine Italia Srl

Inventors

• Evangelisti Daniele
• Fantinel Fabiana
• Gaddi Benedetta
• Brita Diego
• Collina Gianni

Classifications

• C08F4/651

  Pretreating with non-metals or metal-free compounds · CPC title

• C08F110/02 Primary

  Ethene · CPC title

• C08F10/00 Primary

  Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond · CPC title

• C08F4/6545

  and metals of C08F4/64 or compounds thereof · CPC title

• B01J31/38

  of titanium, zirconium or hafnium · CPC title