Blow molded article based on bimodal random copolymer

Patent metadata

Field	Value
Publication number	US-9708481-B2
Application number	US-201415029493-A
Country	US
Kind code	B2
Filing date	Oct 23, 2014
Priority date	Oct 24, 2013
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

Blow molded article comprising a propylene copolymer composition, the propylene copolymer composition comprises (a) a propylene copolymer (A) having a comonomer content of 0.1 to 2.5 mol-%, the comonomers are C 5 to C 12 α-olefins, and (b) a propylene copolymer (B) having a comonomer content of 1.0 to 7.0 mol-%, the comonomers are C 5 to C 12 α-olefins, wherein further (i) the comonomer content in the propylene copolymer (A) is lower compared to the comonomer content in the propylene copolymer (B), (ii) the propylene copolymer composition has a comonomer content of 0.4 to 5.0 mol-%, the comonomers are C 5 to C 12 α-olefins.

First claim

The invention claimed is:

1. A blow molded article comprising a propylene copolymer composition (P), the propylene copolymer composition (P) comprising
(a) a propylene copolymer (A) having a comonomer content of 0.1 to 2.5 mol-%, the comonomers are C 5 to C 12 α-olefins, and
(b) a propylene copolymer (B) having a comonomer content of 1.0 to 7.0 mol-%, the comonomers are C 5 to C 12 α-olefins, wherein further
(i) the comonomer content in the propylene copolymer (A) is lower compared to the comonomer content in the propylene copolymer (B),
(ii) the propylene copolymer composition (P) has a comonomer content of 0.6 to 1.7 mol-%, the comonomers are C 5 to C 12 α-olefins.

2. The blow molded article according to claim 1 , wherein the propylene copolymer (A) has
(a) a comonomer content of 0.1 to 1.5 mol-%, the comonomers are C 5 to C 12 α-olefins, and/or
(b) a melt flow rate MFR 2 (230° C.) measured according to ISO 1133 in the range of 0.1 to 10.0 g/10 min, and/or
(c) a xylene soluble content (XCS) determined at 23° C. according to ISO 6427 of ≦10.0 wt.-%.

3. The blow molded article according to claim 1 , wherein the propylene copolymer (B) has
(a) a comonomer content of 1.5 to 5.0 mol-%, the comonomers are C 5 to C 12 α-olefins, and/or
(b) a melt flow rate MFR 2 (230° C.) measured according to ISO 1133 in the range of 1.0 to 20.0 g/10 min, and/or
(c) a xylene soluble content (XCS) determined at 23° C. according to ISO 6427 of ≦10.0 wt.-%.

4. The blow molded article according to claim 1 , wherein the propylene copolymer composition (P) has
(a) a comonomer content of 0.6 to 4.0 mol-%, the comonomers are C 5 to C 12 α-olefins, and/or
(b) a melt flow rate MFR 2 (230° C.) measured according to ISO 1133 in the range of 1.0 to 20.0 g/10 min, and/or
(c) a xylene soluble content (XCS) determined at 23° C. according to ISO 6427 of ≦10.0 wt.-%.

5. The blow molded article according to claim 1 , wherein the comonomers
(a) of the propylene copolymer (A) and of the propylene copolymer (B) are independently selected from the group of C 5 α-olefin, C 6 α-olefin, C 7 α-olefin, C 8 α-olefin, C 9 α-olefin, C 10 α-olefin, C 11 α-olefin and C 12 α-olefin, or
(b) of the propylene copolymer (A) and of the propylene copolymer (B) are the same and are selected from the group of C 5 α-olefin, C 6 α-olefin, C 7 α-olefin, C 8 α-olefin, C 9 α-olefin, C 10 α-olefin, C 11 α-olefin and C 12 α-olefin.

6. The blow molded article according to claim 1 , wherein the propylene copolymer composition (P) is a propylene 1-hexene copolymer.

7. The blow molded article according to claim 1 , wherein the ratio MFR (A)/MFR (P) is in the range of 0.1 to 1.5,
wherein
MFR (A) is the melt flow rate MFR 2 (230° C.) [g/10 min] measured according to ISO 1133 of the propylene copolymer (A),
MFR (P) is the melt flow rate MFR 2 (230° C.) [g/10 min] measured according to ISO 1133 of the propylene copolymer composition (P).

8. The blow molded article according to claim 1 , wherein the ratio MFR (A)/MFR (B) is in the range of 0.05 to 1.5
wherein
MFR (A) is the melt flow rate MFR 2 (230° C.) [g/10 min] measured according to ISO 1133 of the propylene copolymer (A),
MFR (B) is the melt flow rate MFR 2 (230° C.) [g/10 min] measured according to ISO 1133 of the propylene copolymer (B).

9. The blow molded article according to claim 1 , wherein corn (P)/com (A) is in the range of 1.0 to 6.0
wherein
com (A) is the comonomer content of the propylene copolymer (A) given in mol percent [mol-%],
com (P) is the comonomer content of the propylene copolymer composition (P) given in mol percent [mol-%].

10. The blow molded article according to claim 1 , wherein
(a) the blow molded article comprises the propylene copolymer composition (P) in an amount of at least 75.0 wt.-%, based on the total weight of the blow molded article,
and/or
(b) weight ratio between the propylene copolymer (A) and the propylene copolymer (B) [(A)/(B)] is in the range of 20/80 to 80/20.

11. The blow molded article according to claim 1 , wherein the blow molded article is an extrusion blow molded article.

12. The blow molded article according to claim 1 , wherein the blow molded article has
(a) a bottle appearance factor (BAF) before sterilization of in-equation (Ia):
65<BAF≦200  (Ia),

and/or
(b) a bottle appearance factor (BAF) after sterilization of in-equation (IIa):
125<BAF≦450  (IIa),

wherein
BAF is defined as:

BAF
=

C
×
G

H

wherein
H is the haze value
C is the clarity value, and
G is the gloss value
wherein haze and clarity values are measured according to ASTM D1003 and gloss is measured according to ASTM D 2457.

13. The blow molded article according to claim 11 , which is an extrusion blow molded article, wherein the extrusion blow molded article is a bottle or a container.

14. A method of preparing a blow molded article comprising blow molding a propylene copolymer composition (P),
the propylene copolymer composition (P) comprising
(a) a propylene copolymer (A) having a comonomer content of 0.1 to 2.5 mol-%, the comonomers are C 5 to C 12 α-olefins, and
(b) a propylene copolymer (B) having a comonomer content of 1.0 to 7.0 mol-%, the comonomers are C 5 to C 12 α-olefins, wherein further
(i) the comonomer content in the propylene copolymer (A) is lower compared to the comonomer content in the propylene copolymer (B),
(ii) the propylene copolymer composition (P) has a comonomer content of 0.6 to 1.7 mol-%, the comonomers are C 5 to C 12 α-olefins.

Assignees

• Borealis Ag

Inventors

• Wang Jingbo
• Klimke Katja
• Doshev Petar
• Leskinen Pauli

Classifications

• C08L23/14 Primary

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

• C08L2203/10

  used for bottles · CPC title

• C08L2205/02

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

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title

• B65D1/0207

  characterised by material, e.g. composition, physical features · CPC title