Heterophasic propylene copolymer with high melting point

Patent metadata

Field	Value
Publication number	US-10053568-B2
Application number	US-201515123313-A
Country	US
Kind code	B2
Filing date	Feb 3, 2015
Priority date	Mar 21, 2014
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

Heterophasic propylene copolymer for retortability, said copolymer has a comonomer content in the range of 1.5 to 14.0 mol-%; a melting temperature in the range of 140 to 15° C. and a xylene cold soluble (XCS) fraction in the range of 10.0 to below 30.0 wt.-%.

First claim

The invention claimed is:

1. Heterophasic propylene copolymer (RAHECO) comprising:
(i) a matrix (M) being a propylene copolymer (R-PP) and
(ii) an elastomeric propylene copolymer (EC) dispersed in said matrix (M),
said heterophasic propylene copolymer (RAHECO) has
(a) a comonomer content in the range of 1.5 to 14.0 mol %;
(b) a melting temperature determined by differential scanning calorimetry (DSC) in the range of 140 to 155° C.;
(c) a xylene cold soluble (XCS) fraction determined according to ISO 16152 (25° C.) in the range of 10.0 to equal or below 30.0 wt. %,
wherein further the propylene copolymer (RAHECO) fulfills
(d) the in-equation (I):

C
⁢

⁢

(
XCS
)

C
⁢

⁢

(
total
)

>
2.1

(
I
)

wherein;
C(XCS) is the comonomer content [in mol %] of the xylene cold soluble (XCS) fraction of the total heterophasic propylene copolymer (RAHECO);
C(total) is the comonomer content [in mol %] of the total heterophasic propylene copolymer (RAHECO); and
(e) the in-equation (II):
Tm≥ 153.5−1.8 C (XCI)  (II)

Tm is melting temperature [in ° C.] of the total heterophasic propylene copolymer (RAHECO);
C(XCI) is the comonomer content [in mol %] of the xylene cold insoluble (XCI) fraction of the heterophasic propylene copolymer (RAHECO).

2. Heterophasic propylene copolymer (RAHECO) comprising:
(i) a matrix (M) being a propylene copolymer (R-PP); and
(ii) an elastomeric propylene copolymer (EC) dispersed in said matrix (M),
said heterophasic propylene copolymer (RAHECO) has
(a) a comonomer content in the range of 1.5 to 14.0 mol %;
(b) a melting temperature determined by differential scanning calorimetry (DSC) in the range of 140 to 155° C.;
(c) a xylene cold soluble (XCS) fraction determined according to ISO 16152 (25° C.) in the range of 10.0 to equal or below 30.0 wt. %,
wherein said propylene copolymer (R-PP) comprises a first polypropylene fraction (PP1) and a second propylene copolymer fraction (R-PP2), the comonomer content in the first polypropylene fraction (PP1) is at most 2.5 mol. %.

3. Heterophasic propylene copolymer (RAHECO) according to claim 2 , wherein:
(a) the comonomer content [in mol %] in the propylene copolymer (R-PP) is higher than in the first polypropylene fraction (PP1); and/or
(b) the weight ratio between the first polypropylene fraction (PP1) and the second propylene copolymer fraction (R-PP2)[(PP1)/(R-PP2)] is in the range of 10:90 to 60:40.

4. Heterophasic propylene copolymer (RAHECO) according to claim 2 , wherein:
(a) the comonomer content between a first polypropylene fraction (PP1) and the propylene copolymer (R-PP) differ by at least 1.5 mol %; and/or
(b) the comonomer content between the first polypropylene fraction (PP1) and the second propylene copolymer fraction (R-PP2) differ by at least 3.0 mol%.

5. Heterophasic propylene copolymer (RAHECO) according to claim 2 , wherein:
(a) the first polypropylene fraction (PP1) is a propylene homopolymer; and/or
(b) the second propylene copolymer fraction (R-PP2) has a comonomer content in the range of 4.0 to 18.0 mol %.

6. Heterophasic propylene copolymer (RAHECO) according claim 2 , fulfilling
(a) the in-equation (I):

C
⁢

⁢

(
XCS
)

C
⁢

⁢

(
total
)

≥
2.1

(
I
)

wherein;
C(XCS) is the comonomer content [in mol %] of the xylene cold soluble (XCS) fraction of the total heterophasic propylene copolymer (RAHECO);
C(total) is the comonomer content [in mol %] of the total heterophasic propylene copolymer (RAHECO); and/or
(b) the in-equation (II):
Tm≥ 152.0−1.8 C (XCI)  (II)

Tm is melting temperature [in °C.] of the total heterophasic propylene copolymer (RAHECO);
C(XCI) is the comonomer content [in mol %] of the xylene cold insoluble (XCI) fraction of the heterophasic propylene copolymer (RAHECO).

7. Heterophasic propylene copolymer (RAHECO) according to claim 2 , wherein:
(a) the propylene copolymer (R-PP) has a comonomer content in the range of 1.5 to 14.0 mol %; and/or
(b) the elastomeric propylene copolymer (EC) has a comonomer content in the range of 18.0 to 60.0 mol %.

8. Heterophasic propylene copolymer (RAHECO) according to claim 2 , wherein the comonomer in the propylene copolymer (R-PP) and/or the elastomeric propylene copolymer (EC) is ethylene.

9. Heterophasic propylene copolymer (RAHECO) according to claim 2 , wherein;
(a) the xylene cold soluble fraction (XCS) has a comonomer content, e.g. ethylene content, in is in the range of 18.0 to 60.0 mol %; and/or
(b) the xylene cold in-soluble (XCI) fraction has a comonomer content, e.g. ethylene content, in is in the range of 1.5 to 14.0 mol %.

10. Heterophasic propylene copolymer (RAHECO) according to claim 2 , wherein the intrinsic viscosity of the xylene cold soluble fraction (XCS) of the heterophasic propylene copolymer (RAHECO) is in the range of 1.1 to 2.2 dl/g.

11. Heterophasic propylene copolymer (RAHECO) according to claim 2 , fulfilling
(a) in-equation (III):

C
⁢

⁢

(
XCS
)

Assignees

• Borealis Ag

Inventors

• Wang Jingbo
• Doshev Petar
• Gahleitner Markus
• Lilja Johanna

Classifications

• C08L23/12

  Polypropene · CPC title

• C08F2/001

  Multistage polymerisation processes characterised by a change in reactor conditions without deactivating the intermediate polymer (C08F295/00, C08F297/00 take precedence) · 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

• C08F10/06 Primary

  Propene · CPC title

• C08L23/16 Primary

  Ethylene-propylene or ethylene-propylene-diene copolymers · CPC title