Blow molded article based on bimodal random copolymer

Patent metadata

Field	Value
Publication number	US-2016237270-A1
Application number	US-201415029493-A
Country	US
Kind code	A1
Filing date	Oct 23, 2014
Priority date	Oct 24, 2013
Publication date	Aug 18, 2016
Grant date	—

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

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 0.4 to 5.0 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 com (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 (I), in equation (Ia), or in-equation (Ib),
BAF>65  (I),

65<BAF≦200  (Ia),

68<BAF≦160  (Ib)

and/or (b) a bottle appearance factor (BAF) after sterilization of in-equation (II), in-equation (IIa), or in-equation (IIb),
BAF>125  (II),

125<BAF≦450  (IIa),

200<BAF≦400  (IIb)

wherein BAF is defined as:

SAF
=

C
×
G

H

wherein
H is the haze value
C is the clarity value,
G is the gloss value,
wherein further the haze, the clarity and the gloss are determined according to ASTM D 1003-07 on a test specimen cut from a bottle having a wall thickness of 0.3 mm made from propylene copolymer composition (P).

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

14 - 15 . (canceled)

16 . A method of improving the impact-stiffness-balance and/or the bottle appearance factor of an (extrusion) blow molded article comprising utilizing a propylene copolymer composition (P) according to claim 1 in the blow molding process.

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

• B65D1/0207

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

• C08L2203/10

  used for bottles · CPC title

• C08L23/142 Primary

  at least partially crystalline copolymers of propene with other olefins · 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