Heterophasic propylene copolymers

Patent metadata

Field	Value
Publication number	US-10316122-B2
Application number	US-201615768875-A
Country	US
Kind code	B2
Filing date	Oct 25, 2016
Priority date	Nov 5, 2015
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

A polypropylene composition made from or containing:
A) from 50 wt % to 90 wt %; of a propylene homopolymer; B) from 10 wt % to 50 wt %; of a copolymer of propylene having from 30.0 wt % to 70.0 wt %, of ethylene derived units, based upon the total weight of the copolymer; the sum of the amount of component A) and B) being 100; the polypropylene composition having: i) an intrinsic viscosity of the fraction soluble in xylene at 25° C. between 2.2 to 4.0 dl/g; ii) a MFR L (Melt Flow Rate according to ISO 1133, condition L, at 230° C. and 2.16 kg load) from 0.5 to 100 g/10 min; iii) a xylene soluble fraction ranging from 20 wt % to 50 wt %, based upon the total weight of the polypropylene composition; wherein the polypropylene composition being obtained by a polymerization process wherein the catalyst system contains bismuth.

First claim

What is claimed is:

1. A polypropylene composition comprising:
A) from about 50 wt % to about 90 wt %; of a propylene homopolymer having a fraction insoluble in xylene at 25° C., higher than 90%; and a MFR L (Melt Flow Rate according to ISO 1133, condition L, at 230° C. and 2.16 kg load) from about 0.5 to about 200 g/10 min;
B) from about 10 wt % to about 50 wt %; of a copolymer of propylene and ethylene having from about 30.0 wt % to about 70.0 wt %, of ethylene derived units, based upon the total weight of the copolymer;
the sum of the amount of component A) and B) being 100;
the polypropylene composition having:
i) an intrinsic viscosity of the fraction soluble in xylene at 25° C. between about 2.2 to about 4.0 dl/g;
ii) a MFR L (Melt Flow Rate according to ISO 1133, condition L, at 230° C. and 2.16 kg load) from about 0.5 to about 100 g/10 min;
iii) a xylene soluble fraction ranging from about 25 wt % to about 50 wt %, based upon the total weight of the polypropylene composition;

wherein the polypropylene composition being obtained by a polymerization process comprising the steps of:
step a) polymerizing propylene to obtain component A) in the presence of a catalyst comprising the product of a reaction between:
a) a solid catalyst component comprising Ti, Mg, Cl, and an internal electron donor compound containing from about 0.1 to about 50% wt of Bi with respect to the total weight of the solid catalyst component;
b) an alkylaluminum compound and,
c) an electron-donor compound (external donor); and

step b) polymerizing propylene and ethylene to obtain component B) in the presence of the polymerization product of step a).

2. The polypropylene composition according to claim 1 wherein component A) ranges from about 60 wt % to about 85 wt %; and component B) ranges from about 15 wt % to about 40 wt %.

3. The polypropylene composition according to claim 1 wherein component B) contains from about 35.0 wt % to about 60.0 wt % of ethylene derived units, based upon the total weight of the copolymer.

4. The polypropylene composition according to claim 1 , having MFR L (Melt Flow Rate according to ISO 1133, condition L, at 230° C. and 2.16 kg load) of the polypropylene composition in the range from about 8 to about 70 g/10 min.

5. The polypropylene composition according to claim 1 , having the xylene soluble fraction of the polypropylene composition in the range from about 25 wt % to about 35 wt %, based upon the total weight of the polypropylene composition.

6. An automotive interior element comprising:
a polypropylene composition comprising
A) from about 50 wt % to about 90 wt %; of a propylene homopolymer having a fraction insoluble in xylene at 25° C., higher than 90%; and a MFR L (Melt Flow Rate according to ISO 1133, condition L, at 230° C. and 2.16 kg load) from about 0.5 to about 200 g/10 min;
B) from about 10 wt % to about 50 wt %; of a copolymer of propylene and ethylene having from about 30.0 wt % to about 70.0 wt %, of ethylene derived units, based upon the total weight of the copolymer;
the sum of the amount of component A) and B) being 100;
the polypropylene composition having:
i) an intrinsic viscosity of the fraction soluble in xylene at 25° C. between about 2.2 to about 4.0 dl/g;
ii) a MFR L (Melt Flow Rate according to ISO 1133, condition L, at 230° C. and 2.16 kg load) from about 0.5 to about 100 g/10 min;
iii) a xylene soluble fraction ranging from about 25 wt % to about 50 wt %, based upon the total weight of the polypropylene composition;
wherein the polypropylene composition being obtained by a polymerization process comprising the steps of:
step a) polymerizing propylene to obtain component A) in the presence of a catalyst comprising the product of a reaction between:
a) a solid catalyst component comprising Ti, Mg, Cl, and an internal electron donor compound containing from about 0.1 to about 50% wt of Bi with respect to the total weight of the solid catalyst component;
b) an alkylaluminum compound and,
c) an electron-donor compound (external donor); and
step b) polymerizing propylene and ethylene to obtain component B) in the presence of the polymerization product of step a).

Assignees

• Basell Poliolefine Italia Srl

Inventors

• Massari Paola
• Cathelin Caroline
• Morini Giampiero
• Piemontesi Fabrizio
• Vitale Gianni
• Ciarafoni Marco
• Cavalieri Claudio
• Pantaleoni Roberto
• Grazzi Michele

Classifications

• C08L23/16

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

• C08L23/12 Primary

  Polypropene · CPC title

• C08F210/16

  Copolymers of ethene with alpha-alkenes, e.g. EP rubbers · CPC title

• C08F210/06 Primary

  Propene · CPC title

• C08F10/06

  Propene · CPC title