# US 2010/0168341 A1 · Process for producing propylene block copolymer

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- Number: US 2010/0168341 A1
- Document ID: US20100168341A1
- Status: Published application
- Kind: A1
- Application number: 12/642,153
- Filed: 2009-12-18
- Published: 2010-07-01
- Earliest claimed: 2008-12-25
- Assignees: Sumitomo Chemical Company, Limited
- Inventors: Yasuki FUJIWARA
- Web page: https://patentgrep.com/patent/US20100168341A1

## CPC

- C08F 10/06: Propene
- C08F 297/083: {the monomers being ethylene or propylene}
- C08F 210/06: Propene
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

A production process of a propylene block copolymer, comprising the steps of (I) contacting a solid catalyst component containing titanium atoms, magnesium atoms and halogen atoms with an organoaluminum compound and an external electron donor represented by the defined formula, thereby forming a polymerization catalyst, (II) polymerizing propylene in the presence of the polymerization catalyst, thereby forming a polymer component (1) having an intrinsic viscosity, [η]1, and (III) copolymerizing propylene with an olefin other than propylene in the presence of the polymer component (1), thereby forming a polymer component (2) having an intrinsic viscosity, [η]2, which is three times or more [η]1.

## Claims

### Claim 1

A process for producing a propylene block copolymer, comprising the steps of:
(I) contacting a solid catalyst component containing titanium atoms, magnesium atoms and halogen atoms with an organoaluminum compound and an external electron donor represented by following formula (i), thereby forming a polymerization catalyst;
(II) homopolymerizing propylene or copolymerizing propylene with an olefin other than propylene in the presence of the polymerization catalyst, thereby forming a polymer component (1) containing 90% by weight or more of propylene units, and having an intrinsic viscosity, [η]1, of 1.0 dl/g or less, the total of polymer component (1) being 100% by weight; and
(III) copolymerizing propylene with an olefin other than propylene in the presence of polymer component (1), thereby forming a polymer component (2) containing 10 to 90% by weight of propylene units, and having an intrinsic viscosity, [η]2, of 1 to 10 dl/g, which is three times or more the total of polymer component (2) being 100% by weight,
R1Si(OC2H5)3 (i)
wherein R1 is a hydrocarbyl group having 3 to 20 carbon atoms, whose carbon atom linked directly to the silicon atom is a secondary carbon atom.

### Claim 2 (depends on 1)

The process according to claim 1, wherein a compound having a bond —C—O—C—O—C— is further brought into contact in step (I).

### Claim 3 (depends on 1)

The process according to claim 1, wherein the process contains following steps (i) and (ii) before step (I):
(i) reducing a titanium compound represented by following formula (ii) by an organomagnesium compound in the presence of a silicon compound containing a Si—O bond, thereby forming a solid catalyst component precursor; and
(ii) contacting the solid catalyst component precursor with a halogen-containing compound and an internal electron donor, thereby forming a solid catalyst component containing titanium atoms, magnesium atoms and halogen atoms, which corresponds to the solid catalyst component in step (I);
wherein R2 is a hydrocarbyl group having 1 to 20 carbon atoms; X is independently of one another a halogen atom or a hydrocarbyloxy group having 1 to 20 carbon atoms; and “a” is a number of 1 to 20.

### Claim 4 (depends on 1)

The process according to claim 1, wherein the process contains following steps (1) and (2) before step (I):
(1) contacting a solid catalyst component containing titanium atoms, magnesium atoms and halogen atoms with an organoaluminum compound and an external electron donor represented by following formula (IV), thereby forming a contact product; and
(2) polymerizing an α-olefin in the presence of the contact product, thereby forming a pre-polymerized solid catalyst component containing titanium atoms, magnesium atoms and halogen atoms, which corresponds to the solid catalyst component in step (I):
R3nSi(OR4)4-n (IV)
wherein R3 is independently of one another a hydrocarbyl group having 1 to 20 carbon atoms, a hydrogen atom, or a heteroatom-containing group; R4 is independently of one another a hydrocarbyl group having 1 to 20 carbon atoms; and n is a number of 1 to 3.

### Claim 5 (depends on 4)

The process according to claim 4, wherein the external electron donor represented by formula (IV) is a compound represented by following formula (V):
R37R38Si(OCH3)2 (V)
wherein R37 and R38 are independently of each other a hydrocarbyl group having 1 to 20 carbon atoms, a hydrogen atom, or a heteroatom-containing group.

### Claim 6 (depends on 4)

The process according to claim 4, wherein the external electron donor represented by formula (IV) is an external electron donor represented by formula (i).