# US 9,752,023 B2 · Process for the preparation of heterophasic propylene polymer compositions

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- Number: US 9,752,023 B2
- Document ID: US9752023B2
- Status: Granted
- Kind: B2
- Application number: 14/358,753
- Filed: 2012-11-07
- Published: 2014-10-23
- Granted: 2017-09-05
- Earliest claimed: 2011-11-17
- Assignees: Basell Poliolefine Italia S.r.l.
- Applicants: Basell Poliolefine Italia S.r.l.
- Inventors: Monica Galvan; Roberto Pantaleoni; Ofelia Fusco; Benedetta Gaddi; Andreas Neumann; Antonio Mazzucco; Gianni Collina; Marco Ciarafoni
- Web page: https://patentgrep.com/patent/US9752023B2

## CPC

- C08L 23/12: Polypropene
- C08F 10/06: Propene
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

Preparing propylene polymer compositions comprising 50 to 90% by weight of a propylene (co)polymer, and 10 to 50% by weight of an ethylene copolymer. The polymerization process includes, in the presence of a catalyst system: (i) a first step of polymerizing propylene to produce the propylene (co)polymer; and (ii) a successive gas-phase polymerization step performed in the presence of the propylene (co)polymer, ethylene, and one or more α-olefins to produce the ethylene copolymer. The catalyst system contains the product obtained by contacting: (a) a solid catalyst component comprising at least two internal electron donor compounds, a succinate and a 1,3-diether; (b) an aluminum hydrocarbyl compound, and (c) optionally, an external electron donor compound.

## Claims

### Claim 1

A process for the preparation of a propylene polymer composition comprising:
(A) 50-90% by weight of a propylene (co)polymer, wherein the propylene (co)polymer contains a fraction that is insoluble in xylene at 25° C., and
(B) 10-50% by weight of an ethylene copolymer, wherein the ethylene copolymer contains a fraction that is soluble in xylene at 25° C.;
wherein the propylene polymer composition has a total ethylene content from 5-10 wt. %, based upon the total weight of the propylene polymer composition, and a flexural modulus greater than 1200 MPa;
said process comprising:
(i) a first step of polymerizing propylene in the optional presence of ethylene and/or C4-C10 alpha olefins, to produce the propylene (co)polymer, wherein the propylene (co)copolymer contains a fraction that is insoluble in xylene at 25° C.; and
(ii) a successive gas-phase copolymerizing step, carried out in the presence of the propylene (co)polymer, a mixture of ethylene and one or more α-olefins CH2═CHR in which R is a hydrocarbon radical having 1-10 carbon atoms, to produce the ethylene copolymer;
the process being carried out in the presence of a catalyst system comprising the product obtained by contacting:
(a) a solid catalyst component comprising a magnesium halide, a titanium compound having at least a Ti-halogen bond and at least two internal electron donor compounds,
wherein the at least two internal electron donor compounds comprise a succinate as a first internal electron donor present in an amount from 35-90% by mol with respect to the total amount of internal electron donor compounds present in the solid catalyst component, and a 1,3-diether comprises the second internal electron donor, wherein the total concentration of the internal electron donors is lower than 14.0% by weight with respect to the total weight of the solid catalyst component;
(b) triethylaluminum; and
(c) optionally, an external electron donor compound at a molar ratio of 5-500 with respect to triethylaluminum.

### Claim 2 (depends on 1)

The process according to claim 1, wherein the catalyst component (a) has an average particle size ranging from 15 to 80 μm.

### Claim 3 (depends on 1)

The process according to claim 1, wherein the succinate is present in amount ranging from 45 to 90% by mol with respect to the total amount of internal donors.

### Claim 4 (depends on 1)

The process according to claim 1, wherein step (i) is carried out in liquid propylene.

### Claim 5 (depends on 1)

A molded article obtained from a propylene polymer composition produced by the process of claim 1.

### Claim 6 (depends on 5)

The molded article of claim 5, wherein the molded article is a food storage container.