Polypropylene composition for automotive interior applications

Patent metadata

Field	Value
Publication number	US-10450451-B2
Application number	US-201515310283-A
Country	US
Kind code	B2
Filing date	May 18, 2015
Priority date	May 20, 2014
Publication date	Oct 22, 2019
Grant date	Oct 22, 2019

Abstract

Polypropylene composition comprising a heterophasic propylene copolymer and a mineral filler, wherein said heterophasic propylene copolymer has a melting temperature in the range of 140 to 155° C., a xylene cold soluble content in the range of 20 to 35 wt.-% and a comonomer content of the xylene cold soluble fraction in the range of 18 to 95 wt.-%, wherein further the weight ratio between heterophasic propylene copolymer and the mineral filler is in the range of 2/1 to 4/1.

First claim

The invention claimed is:

1. A polypropylene composition comprising
(a) a heterophasic propylene copolymer (HECO) comprising
(a1) a matrix (M) being a propylene homopolymer (H-PP) or propylene copolymer (R-PP) and
(a2) an elastomeric propylene copolymer (EC) dispersed in said matrix (M),

(b) a mineral filler (F),
(c) a high density polyethylene (HDPE), having
(c1) a density of at least 940 kg/m 3 and
(c2) a melt flow rate MFR 2 (190° C.) of 0.2 to 10 g/10 min, and

(d) a plastomer (P) being chemically different to the elastomeric propylene copolymer (EC) of the heterophasic propylene copolymer (HECO), wherein the plastomer (P):
(d1) is a polyethylene,
(d2) has a density in the range 820 to 880 kg/m 3 , and
(d3) has a melt flow rate MFR 2 (190° C.) measured according to ISO 1133 in the range of 0.5 to 30.0 g/10 min,

wherein said heterophasic propylene copolymer (HECO) has
(i) a melting temperature determined by differential scanning calorimetry (DSC) in the range of 140 to 155° C.,
(ii) an ethylene content in the range of 22.0 to 35.0 wt %, based on the total weight of the heterophasic propylene copolymer (HECO),
(iii) a xylene cold soluble (XCS) content in the range of 20 to 35 wt.-%, and
(iv) a comonomer content of the xylene cold soluble (XCS) fraction in the range of 60 to 95 wt.-%,
wherein further the weight ratio between the heterophasic propylene copolymer (HECO) and the mineral filler (F) [(HECO)/(F)] is in the range of 2/1 to below 4/1 and
the melt flow rate MFR 2 (230° C.) measured according to ISO1133 of the polypropylene composition is in the range of 1.0 to 11.0 g/10min.

2. The polypropylene composition according to claim 1 , wherein
(a) the matrix (M) has melt flow rate MFR 2 (230° C.) measured according to ISO 1133 in the range of 20 to 80 g/10 min, and/or
(b) the heterophasic propylene copolymer (HECO) has 2,1 regio-defects of at least 0.2 mol % determined by 13 C-NMR spectroscopy.

3. A polypropylene composition comprising
(a) a heterophasic propylene copolymer (HECO) comprising
(a1) a matrix (M) being a propylene homopolymer (H-PP) or propylene copolymer (R-PP) and
(a2) an elastomeric propylene copolymer (EC) dispersed in said matrix (M),

and
(b) a mineral filler (F),
(c) a high density polyethylene (HDPE), having
(c1) a density of at least 940 kg/m 3 and
(c2) a melt flow rate MFR 2 (190° C.) of 0.2 to 10 g/10 min, and

(d) a plastomer (P) being chemically different to the elastomeric propylene copolymer (EC) of the heterophasic propylene copolymer (HECO), wherein the plastomer (P):
(d1) is a polyethylene,
(d2) has a density in the range 820 to 880 kg/m 3 , and
(d3) has a melt flow rate MFR 2 (190° C.) measured according to ISO 1133 in the range of 0.5 to 30.0 g/10 min,

wherein said heterophasic propylene copolymer (HECO) has
(i) 2,1 regio-defects of at least 0.2 mol % determined by 13 C-NMR spectroscopy,
(ii) an ethylene content in the range of 22.0 to 35.0 wt %, based on the total weight of the heterophasic propylene copolymer (HECO),
(iii) a xylene cold soluble (XCS) content in the range of 20 to 35 wt.-%, and
(iv) a comonomer content of the xylene cold soluble (XCS) fraction in the range of 60 to 95 wt.-%,
wherein further the weight ratio between the heterophasic propylene copolymer (HECO) and the mineral filler (F) [(HECO)/(F)] is in the range of 2/1 to below 4/1, and the melt flow rate MFR 2 (230° C.) measured according to ISO1133 of the polypropylene composition is in the range of 1.0 to 11.0 g/10 min.

4. The polypropylene composition according to claim 3 , wherein the matrix (M) has melt flow rate MFR 2 (230° C.) measured according to ISO 1133 in the range of 20 to 80 g/10 min.

5. The polypropylene composition according to claim 1 , wherein
(a) the matrix (M) is a propylene homopolymer (H-PP), and/or
(b) the intrinsic viscosity of the xylene cold soluble fraction (XCS) of the heterophasic propylene copolymer (HECO) is at least 1.0.

6. The polypropylene composition according to claim 1 , wherein the melt flow rate MFR 2 (230° C.) measured according to ISO 1133
of the heterophasic propylene copolymer (HECO) is in the range of 1.0 to 30 g/10 min.

7. The polypropylene composition according to claim 1 , wherein the heterophasic propylene copolymer (HECO) has a first glass transition temperature Tg(1) and a second glass transition temperature Tg(2), wherein said first glass transition temperature Tg(1) is above the second glass transition temperature Tg(2).

8. An article comprising a composition according to claim 1 .

9. The article according to claim 8 , wherein the article is an automotive interior article.

10. The polypropylene composition according to claim 3 , wherein
(a) the matrix (M) is a propylene homopolymer (H-PP), and/or
(b) the intrinsic viscosity of the xylene cold soluble fraction (XCS) of the heterophasic propylene copolymer (HECO) is at least 1.0.

11. The polypropylene composition according to claim 3 , wherein the melt flow rate MFR 2 (230° C.) measured according to ISO 1133
of the heterophasic propylene copolymer (HECO) is in the range of 1.0 to 30 g/10 min.

12. The polypropylene composition according to claim 3 , wherein the heterophasic propylene copolymer (HECO) has a first glass transition temperature Tg(1) and a second glass transition temperature Tg(2), wherein said first glass transition temperature Tg(1) is above the second glass transition temperature Tg(2).

Assignees

• Borealis Ag

Inventors

• Wang Jingbo
• Resconi Luigi
• Doshev Petar
• Gahleitner Markus

Classifications

• C08L2207/04

  Thermoplastic elastomer · CPC title

• C08L23/12 Primary

  Polypropene · CPC title

• C08F210/06

  Propene · CPC title

• C08K3/34

  Silicon-containing compounds · CPC title

• C08F4/65927

  two cyclopentadienyl rings being mutually bridged · CPC title