Random propylene copolymer for bottles with good optical properties

Patent metadata

Field	Value
Publication number	US-9540506-B2
Application number	US-201314441150-A
Country	US
Kind code	B2
Filing date	Nov 6, 2013
Priority date	Nov 16, 2012
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

Propylene copolymer having a melt flow rate MFR 2 (230° C.) in the range of more than 1.0 to below 2.5 g/10 min, a xylene cold soluble content (XCS) in the range of 25.0 to 35.0 wt.-%, a comonomer content in the range of more than 7.5 to 12.0 wt.-%, wherein further the xylene cold soluble (XCS) fraction of the propylene copolymer has comonomer content in the range of 16.0 to 28.0 wt.-% and an intrinsic viscosity (IV) in the range of more than 1.2 to below 2.5 dl/g.

First claim

The invention claimed is:

1. A propylene copolymer having:
(a) a melt flow rate MFR 2 (230° C.) measured according to ISO 1133 in the range of more than 1.0 to below 2.5 g/10 min,
(b) a xylene cold soluble content (XCS) determined according to ISO 16152 (25° C.) in the range of 25.0 to 35.0 wt. %, based on the total amount of the propylene copolymer, and
(c) a comonomer content in the range of more than 7.5 to 12.0 wt. %, based on the total amount of the propylene copolymer,
wherein further;
(d) the comonomer content of xylene cold soluble (XCS) fraction of the propylene copolymer is in the range of 16.0 to 28.0 wt. %, based on the total weight of the xylene cold soluble (XCS) fraction, and
(e) the intrinsic viscosity (IV) determined according to DIN ISO 1628/1 (in decalin at 135° C.) of the xylene cold soluble (XCS) fraction of the propylene copolymer is in the range of more than 1.2 to below 2.5 dl/g.

2. The propylene copolymer according to claim 1 , wherein the xylene cold insoluble (XCI) fraction of the propylene copolymer has a polydispersity (Mw/Mn) of more than 4.9 to 10.0.

3. A propylene copolymer having:
(a) a melt flow rate MFR 2 (230° C.) measured according to ISO 1133 in the range of more than 1.0 to below 2.5 g/10 min,
(b) a xylene cold soluble content (XCS) determined according to ISO 16152 (25° C.) in the range of 25.0 to 35.0 wt. %, based on the total amount of the propylene copolymer, and
(c) a comonomer content in the range of more than 7.5 to 12.0 wt. %, based on the total amount of the propylene copolymer,
wherein further;
(d) the comonomer content of xylene cold soluble (XCS) fraction of the propylene copolymer is in the range of 16.0 to 28.0 wt. %, based on the total amount of the xylene cold soluble (XCS) fraction, and
(e) the xylene cold insoluble (XCI) fraction of the propylene copolymer has a polydispersity (Mw/Mn) of more than 4.9 to 10.0.

4. The propylene copolymer according to claim 3 , wherein the intrinsic viscosity (IV) determined according to DIN ISO 1628/1 (in decalin at 135° C.) of the xylene cold soluble (XCS) fraction of the propylene copolymer is in the range of more than 1.2 to below 2.5 dl/g.

5. The propylene copolymer according to claim 1 , wherein the propylene copolymer:
(a) comprises an α-nucleating agent, and/or
(b) has a hexane soluble content of below 10.0 wt. %, based on the total amount of the propylene copolymer and/or
(c) has a xylene cold insoluble (XCI) fraction with a comonomer content in the range of 3.0 to 7.0 wt. %, based on the total amount of the xylene cold insoluble (XCI) fraction.

6. The propylene copolymer according to claim 1 , wherein the propylene copolymer fulfills:
(a)

Co
⁢

⁢

(
total
)

Co
⁢

⁢

(
XCS
)

≤
0.7

:

inequation
⁢

⁢

(
I
)

wherein:
Co (total) is the comonomer content [wt. %] of the propylene copolymer, based on the total amount of the propylene copolymer,
Co (XCS) is the comonomer content [wt. %] of the xylene cold soluble fraction (XCS) of the propylene copolymer, based on the total amount of the xylene cold soluble fraction (XCS); and/or
(b)

inequation
⁢

⁢

(
II
)

3.4
≤

Co
⁢

⁢

(
XCS
)

Co
⁢

⁢

(
XCl
)

≤
6.0

:

(
II
)

wherein:
Co (XCS) is the comonomer content [wt. %] of the xylene cold soluble (XCS) of the propylene copolymer, based on the total amount of the xylene cold soluble fraction (XCS) and
Co (XCI) is the comonomer content [wt. %] of the xylene cold insoluble (XCI) of the propylene copolymer, based on the total amount of the xylene cold insoluble fraction (XCI).

7. The propylene copolymer according to claim 1 , wherein the propylene copolymer has a melting temperature Tm determined by differential scanning calorimetry (DSC) in the range of 146 to 159 ° C.

8. The propylene copolymer according to claim 1 , wherein the propylene copolymer is a heterophasic propylene copolymer (RAHECO) comprising a matrix (M) and an elastomeric propylene copolymer (E) dispersed in said matrix (M), wherein said matrix (M) is a random propylene copolymer (R-PP).

9. The propylene copolymer according to claim 8 , wherein the weight ratio between the matrix (M) and the elastomeric propylene copolymer (E) is 60/40 to 90/10.

10. The propylene copolymer according to claim 8 , wherein the random propylene copolymer (R-PP):
(a) has a comonomer content in the range of 1.0 to 7.0 wt. % based on the random propylene copolymerm (R-PP), and/or
(b)

Assignees

• Borealis Ag

Inventors

• Gahleitner Markus
• Klimke Katja
• Bernreitner Klaus
• Sandholzer Martina

Classifications

• C08K5/0083

  Nucleating agents promoting the crystallisation of the polymer matrix · CPC title

• C08L23/142 Primary

  at least partially crystalline copolymers of propene with other olefins · CPC title

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title

• C08L2207/02

  Heterophasic composition · CPC title

• C08L23/08

  Copolymers of ethene (C08L23/16 takes precedence) · CPC title