Injection molded article based on propylene homopolymer

Patent metadata

Field	Value
Publication number	US-10138335-B2
Application number	US-201515525711-A
Country	US
Kind code	B2
Filing date	Nov 17, 2015
Priority date	Nov 19, 2014
Publication date	Nov 27, 2018
Grant date	Nov 27, 2018

Abstract

Injection molded article for healthcare applications based on propylene homopolymer having a melt flow rate in the range of 40 to 120 g/10 min, a pentad isotacticity of more than 92.5%, and meso sequence length of 91.0 to 160.

First claim

What is claimed is:

1. Injection molded article comprising a propylene homopolymer having
(a) a melt flow rate MFR 2 (230° C./2.16 kg) measured according to ISO 1133 in the range of 40 to 120 g/10 min;
(b) a pentad isotacticity (mmmm) of more than 92.5% determined by 13 C-NMR; and
(c) a meso sequence length (MSL4) of 91.0 to 160; MSL4 is calculated by formula (1)

MSL
⁢
4

=

2
*

[
mmmm
]

[
mmmr
]

+
4

(
1
)

wherein
“[mmmm]” is % of mmmm pentads
“[mmmr]” is % of mmmr pentads,
determined by 13 C-NMR spectroscopy.

2. Injection molded article according to claim 1 , wherein the propylene homopolymer has a meso sequence length (MSL2) of equal to or more than 65.0; MSL2 is calculated by formula (2)

MSL
⁢
2

=

2
*

[
mm
]

[
mr
]

+
2

(
2
)

wherein
“[mm]” are % of mm triads,
“[mr]” are % of mr triads,
determined by 13 C-NMR spectroscopy.

3. Injection molded article according to claim 1 , wherein the propylene homopolymer has
(a) a triad syndiotacticity (rr) of not more than 2.5% as determined by 13 C-NMR spectroscopy;
and/or
(b) a pentad isotacticity (mmmm) of more than 92.5 to 97.3% as determined by 13 C-NMR spectroscopy.

4. Injection molded article according to claim 1 , wherein the propylene homopolymer has 2,1 erythro regio-defects of equal to or below0.4 mol.-% determined by 13 C-NMR spectroscopy.

5. Injection molded article according to claim 1 , wherein the propylene homopolymer has a xylene cold soluble content (XCS) determined according ISO 16152 (25° C.) of below 4.0 wt.-%.

6. Injection molded article according to claim 1 , wherein the propylene homopolymer has a melting temperature of at least 158° C.

7. Injection molded article according to claim 1 , wherein the propylene homopolymer has a crystallization temperature of equal to or below 122° C.

8. Injection molded article according to claim 1 , wherein the propylene homopolymer is not visbroken.

9. Injection molded article according to claim 1 , wherein the propylene homopolymer has a flexural modulus measured at 23° C. according to ISO 178 of at least 1,350 MPa.

10. Injection molded article according to claim 1 , wherein the propylene homopolymer has a clarity measured according to ASTM D 1003/92 on injection molded specimen of 1 mm thickness of at least 55%.

11. Injection molded article according to claim 1 , wherein the injection molded article is a healthcare article.

12. Injection molded article according to claim 1 wherein the injection molded article is selected from the group consisting of syringes, pipette tips, and PCR equipment.

13. Injection molded article according to claim 1 , wherein the injection molded article has in its largest dimension a length of not more than 150 mm.

14. Injection molded article according to claim 1 , wherein the injection molded article has in its largest dimension a length of not more than 130 mm.

15. Injection molded article according to claim 1 , wherein the injection molded article comprises at least 75 wt.-%, based on the total weight of the injection molded article, of a propylene homopolymer having
(a) a melt flow rate MFR 2 (230° C./2.16 kg) measured according to ISO 1133 in the range of 40 to 120 g/10min;
(b) a pentad isotacticity (mmmm) of more than 92.5% determined by 13 C-NMR; and
(c) a meso sequence length (MSL4) of 91.0 to 160; MSL4 is calculated by formula (1)

MSL
⁢

⁢
4

=

2
*

[
mmmm
]

[
mmmr
]

+
4

(
1
)

wherein
“[mmmm]” is % of mmmm pentads
“[mmmr]” is % of mmmr pentads,
determined by 13 C-NMR spectroscopy.

16. Process for producing an injection molded article of claim 1 , wherein the propylene homopolymer is injection molded, wherein further said propylene homopolymer has been obtained by polymerizing propylene 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;
(b) a co-catalyst (Co), and
(c) an external donor (ED).

17. Process according to claim 16 , wherein
(a) the internal donor (ID) is selected from optionally substituted malonates, maleates, succinates, glutarates, cyclohexene-1,2-dicarboxylates, benzoates and derivatives and/or mixtures thereof;
(b) the molar-ratio of co-catalyst (Co) to external donor (ED) [Co/ED] is 5 to 45.

Assignees

• Borealis Ag

Inventors

• Bernreitner Klaus
• Sandholzer Martina
• Stern James
• Belshaw Joanne

Classifications

• C08F4/651

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

• C08F110/06

  Propene · CPC title

• C08J5/00 Primary

  Manufacture of articles or shaped materials containing macromolecular substances (manufacture of semi-permeable membranes B01D67/00 - B01D71/00) · CPC title

• B29C45/0001 Primary

  characterised by the choice of material · CPC title

• C08F4/6492

  containing aliphatic unsaturation · CPC title