Soft copolymers with high impact strength

Patent metadata

Field	Value
Publication number	US-10100185-B2
Application number	US-201515113907-A
Country	US
Kind code	B2
Filing date	Feb 3, 2015
Priority date	Feb 6, 2014
Publication date	Oct 16, 2018
Grant date	Oct 16, 2018

Abstract

The present invention is directed to a new heterophasic propylene copolymer (RAHECO) and an injection molded article comprising the heterophasic propylene copolymer (RAHECO) as well as a thin wall packaging comprising the heterophasic propylene copolymer (RAHECO). The present invention is further directed to the use of the heterophasic propylene copolymer (RAHECO) for improving the toughness of an injection molded article.

First claim

The invention claimed is:

1. A heterophasic propylene copolymer (RAHECO), said heterophasic propylene copolymer (RAHECO) comprises a matrix (M) being a random propylene copolymer (R-PP) and an elastomeric propylene copolymer (E) dispersed in said matrix (M),
wherein the heterophasic propylene copolymer (RAHECO) has
a) a melt flow rate MFR 2 (230° C.) measured according to ISO 1133 in the range of 0.3 to 20.0 g/10 min,
b) a xylene cold soluble content (XCS) determined according ISO 16152 (25° C.) in the range of 16.0 to 50.0 wt.-%,
c) a comonomer content in the range of 11.5 to 21.0 mol-%, and

wherein further the heterophasic propylene copolymer (RAHECO) has a Charpy notched impact strength as defined by in-equation (III)
NIS>60−23.0×In(MFR)  (III)

wherein
“NIS” is the Charpy notched impact strength according to ISO 179-1eA:2000 at 23° C. [in kJ/m 2 ] of the heterophasic propylene copolymer (RAHECO), and
“MFR” is the MFR 2 (230° C./2.16 kg) [in g/10 min] of the heterophasic propylene copolymer (RAHECO),
wherein further
d) the xylene cold insoluble fraction (XCI) of the heterophasic propylene copolymer (RAHECO) has a relative content of isolated to block ethylene sequences (I(E)) in the range of 50.0 to 65.0%, wherein the I(E) content is defined by equation (I)

I
⁡

(
E
)

=

fPEP

(

fEEE
+
fPEE
+
fPEP

)

×
100

(
I
)

wherein
I(E) is the relative content of isolated to block ethylene sequences [in %];
fPEP is the mol fraction of propylene/ethylene/propylene sequences (PEP) in the xylene cold insoluble fraction (XCI) of the heterophasic propylene copolymer (RAHECO);
fPEE is the mol fraction of propylene/ethylene/ethylene sequences (PEE) and of ethylene/ethylene/propylene sequences (EEP) in the xylene cold insoluble fraction (XCI) of the heterophasic propylene copolymer (RAHECO);
fEEE is the mol fraction of ethylene/ethylene/ethylene sequences (EEE) in the xylene cold insoluble fraction (XCI) of the heterophasic propylene copolymer (RAHECO),
wherein all sequence concentrations being based on a statistical triad analysis of 13 C-NMR data.

2. The heterophasic propylene copolymer (RAHECO) according to claim 1 , wherein the heterophasic propylene copolymer (RAHECO) is free of phthalic acid esters as well as their respective decomposition products.

3. A heterophasic propylene copolymer (RAHECO), said heterophasic propylene copolymer (RAHECO) comprises a matrix (M) being a random propylene copolymer (R-PP) and an elastomeric propylene copolymer (E) dispersed in said matrix (M),
wherein the heterophasic propylene copolymer (RAHECO) has
a) a melt flow rate MFR 2 (230° C.) measured according to ISO 1133 in the range of 0.3 to 20.0 g/10 min,
b) a xylene cold soluble content (XCS) determined according ISO 16152 (25° C.) in the range of 16.0 to 50.0 wt.-%,
c) a comonomer content in the range of 11.5 to 21.0 mol-%, and

wherein further the heterophasic propylene copolymer (RAHECO) has a Charpy notched impact strength as defined by in-equation (III)
NIS>60−23.0×In(MFR)  (III)

wherein
“NIS” is the Charpy notched impact strength according to ISO 179-1eA:2000 at 23° C. [in kJ/m 2 ] of the heterophasic propylene copolymer (RAHECO), and
“MFR” is the MFR 2 (230° C./2.16 kg) [in g/10 min] of the heterophasic propylene copolymer (RAHECO).

4. The heterophasic propylene copolymer (RAHECO) according to claim 3 , wherein
a) the xylene cold insoluble fraction (XCI) of the heterophasic propylene copolymer (RAHECO) has a relative content of isolated to block ethylene sequences (I(E)) in the range of 50.0 to 65.0%, wherein the I(E) content is defined by equation (I)

I
⁡

(
E
)

=

fPEP

(

fEEE
+
fPEE
+
fPEP

)

×
100

(
I
)

wherein
I(E) is the relative content of isolated to block ethylene sequences [in %];
fPEP is the mol fraction of propylene/ethylene/propylene sequences (PEP) in the xylene cold insoluble fraction (XCI) of the heterophasic propylene copolymer (RAHECO);
fPEE is the mol fraction of propylene/ethylene/ethylene sequences (PEE) and of ethylene/ethylene/propylene sequences (EEP) in the xylene cold insoluble fraction (XCI) of the heterophasic propylene copolymer (RAHECO);
fEEE is the mol fraction of ethylene/ethylene/ethylene sequences (EEE) in the xylene cold insoluble fraction (XCI) of the heterophasic propylene copolymer (RAHECO),
wherein all sequence concentrations being based on a statistical triad analysis of 13 C-NMR data
and/or
b) wherein the heterophasic propylene copolymer (RAHECO) is free of phthalic acid esters as well as their respective decomposition products.

5. A heterophasic propylene copolymer (RAHECO), said heterophasic propylene copolymer (RAHECO) comprises a matrix (M) being a random propylene copolymer (R-PP) and an elastomeric propylene copolymer (E) dispersed in said matrix (M),
wherein the heterophasic propylene copolymer (RAHECO) has
a) a melt flow rate MFR 2 (230° C.) measured according to ISO 1133 in the range of 0.3 to 20.0 g/10 min,
b) a xylene cold soluble content (XCS) determined according ISO 16152 (25° C.) in the range of 16.0 to 50.0 wt.-%, and
c) a comonomer content in the range of 11.5 to 21.0 mol-%,

wherein further the heterophasic propylene copolymer (RAHECO) is free of phthalic acid esters as well as their respective decomposition products.

6. Heterophasic propylene copolymer (RAHECO) according to claim 5 , wherein the xylene cold insoluble fraction (XCI) of the heterophasic propylene copolymer (RAHECO) has a relative content of isolated to block ethylene sequences (I(E)) in the range of 50.0 to 65.0%, wherein the I(E) content is defined by equation (

Assignees

• Borealis Ag

Inventors

• Wang Jingbo
• Leskinen Pauli
• Lilja Johanna
• Gahleitner Markus

Classifications

• C08F2500/17

  Viscosity · CPC title

• C08L2308/00

  Chemical blending or stepwise polymerisation process with the same catalyst · CPC title

• C08L2207/02

  Heterophasic composition · CPC title

• C08F210/06

  Propene · 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