# US 9,751,962 B2 · Low emission propylene homopolymer with high melt flow

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- Number: US 9,751,962 B2
- Document ID: US9751962B2
- Status: Granted
- Kind: B2
- Application number: 15/030,556
- Filed: 2014-11-19
- Published: 2016-09-22
- Granted: 2017-09-05
- Earliest claimed: 2013-11-22
- Assignees: Borealis AG
- Applicants: Borealis AG
- Inventors: Jingbo Wang; Johanna Lilja; Thomas Horill; Markus Gahleitner; Peter Denifl; Timo Leinonen
- Web page: https://patentgrep.com/patent/US9751962B2

## CPC

- C08F 110/06: Propene
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

Propylene homopolymer with reduced emission value and high melt flow rate.

## Claims

### Claim 1

A propylene homopolymer having
(a) a melt flow rate MFR2 (230° C./2.16 kg) measured according to ISO 1133 in the range of 75.0 to 500 g/10 min; and
(b) a pentad isotacticity (mmmm) of more than 90.0% determined by 13C-NMR spectroscopy
wherein further
(c) the propylene homopolymer fulfills inequation (I)
VOC≦(MFR×0.08)+201.0
wherein
VOC is the amount of volatile organic compounds (VOC) [in ppm] measured according to VDA 278:2002 of the propylene homopolymer;
MFR is the melt flow rate MFR2 (230° C./2.16 kg) measured according to ISO 1133 of the propylene homopolymer, and
(d) the propylene homopolymer has a melting temperature Tm of equal to or more than 160° C.

### Claim 2 (depends on 1)

The propylene homopolymer according to claim 1 having an amount of volatile organic compounds (VOC) measured according to VDA 278:2002 of equal or below 210 ppm.

### Claim 3 (depends on 1)

The propylene homopolymer according to claim 1 having a crystallization temperature of equal to or more than 114° C.

### Claim 4 (depends on 1)

The propylene homopolymer according to claim 1, having a xylene cold soluble content (XCS) determined according ISO 16152 (25° C.) of at least 1.8 wt.-%.

### Claim 5 (depends on 1)

The propylene homopolymer according to claim 1, having 2,1 erythro regio-defects of equal to or below 0.4 mol.-% determined by 13C-NMR spectroscopy.

### Claim 6 (depends on 1)

The propylene homopolymer according to claim 1, having a pentad isotacticity (mmmm) of more than 93.0%.

### Claim 7 (depends on 1)

The propylene homopolymer according to claim 1, fulfilling inequation (II)
FOG≦(MFR×1.26)+350.0
wherein
FOG is the amount of fogging compounds (FOG) [in ppm] measured according to VDA 278:2002 of the propylene homopolymer; and
MFR is the melt flow rate MFR2 (230° C./2.16 kg) measured according to ISO 1133 of the propylene homopolymer.

### Claim 8 (depends on 1)

The propylene homopolymer according to claim 1, having an amount of fogging compounds (FOG) measured according to VDA 278:2002 of not more than 580 ppm.

### Claim 9 (depends on 1)

The propylene homopolymer according to claim 1, having a tensile modulus measured at 23° C. according to ISO 527-1 (cross head speed 1 mm/min) of at least 1,500 MPa.

### Claim 10 (depends on 1)

An article comprising the propylene homopolymer according claim 1.

### Claim 11 (depends on 1)

A process for producing a propylene homopolymer according to claim 1, wherein propylene has been polymerized in the presence of
(a) a Ziegler-Natta catalyst (ZN-C) comprising compounds (TC) of a transition metal of Group 4 to 6 of IUPAC, a Group 2 metal compound (MC) and an internal donor (ID), wherein said internal donor (ID) is a non-phthalic compound selected from optionally substituted glutarates and citraconate;
(b) optionally a co-catalyst (Co),
(c) optionally an external donor (ED), and
(d) the molar-ratio of co-catalyst (Co) to external donor (ED) [Co/ED] is 5 to 45.

### Claim 12 (depends on 11)

The process according to claim 11, wherein the propylene homopolymer is produced in a sequential polymerization process comprising at least two reactors (R1) and (R2), in the first reactor (R1) a first propylene homopolymer fraction (H-PP1) is produced and subsequently transferred into the second reactor (R2), in the second reactor (R2) a second propylene homopolymer fraction (H-PP2) is produced in the presence of the first propylene homopolymer fraction (H-PP1).

### Claim 13 (depends on 2)

The propylene homopolymer according to claim 2, having a crystallization temperature of equal to or more than 114° C.

### Claim 14 (depends on 2)

The propylene homopolymer according to claim 2, having a xylene cold soluble content (XCS) determined according ISO 16152 (25° C.) of at least 1.8 wt.-%.

### Claim 15 (depends on 2)

The propylene homopolymer according to claim 2, having 2,1 erythro regio-defects of equal to or below 0.4 mol.-% determined by 13C-NMR spectroscopy.

### Claim 16 (depends on 2)

The propylene homopolymer according to claim 2, having a pentad isotacticity (mmmm) of more than 93.0%.

### Claim 17 (depends on 2)

The propylene homopolymer according to claim 2, fulfilling inequation (II)
FOG≦(MFR×1.26)+350.0
wherein
FOG is the amount of fogging compounds (FOG) [in ppm] measured according to VDA 278:2002 of the propylene homopolymer; and
MFR is the melt flow rate MFR2 (230° C./2.16 kg) measured according to ISO 1133 of the propylene homopolymer.