Composition comprising propylene-ethylene-1-butene terpolymers

Patent metadata

Field	Value
Publication number	US-10894849-B2
Application number	US-201615750123-A
Country	US
Kind code	B2
Filing date	Jul 19, 2016
Priority date	Aug 6, 2015
Publication date	Jan 19, 2021
Grant date	Jan 19, 2021

Abstract

A polyolefin composition made from or containing:
A) from about 19 wt % to about 50 wt % of a propylene ethylene copolymer having an ethylene derived units content ranging from about 1.5 wt % to about 6.0 wt % B) from about 50 wt % to about 81 wt % of a propylene ethylene 1-butene terpolymer having an ethylene derived units content ranging from about 1.5 wt % to about 6.0 wt % and 1-butene derived units content between about 4.8 wt % and about 12.4 wt %; the sum of the amount of component A) and B) being 100; the polyolefin composition being characterized by the following features:
molecular weight distribution (MWD), expressed in terms of Mw/Mn, greater than about 4.0; the creep and recovery curve measured on the polymer fuse at 200° C. shows a maximum value between 600 and 1200 seconds, lower than about 53×10 −4 1/Pa.

First claim

What is claimed is:

1. A polyolefin composition comprising:
A) from about 19 wt % to about 50 wt %, based upon the total weight of the polyolefin composition, of a propylene ethylene copolymer having an ethylene derived units content ranging from about 1.5 wt % to about 6.0 wt %, based upon the total weight of the propylene ethylene copolymer and
B) from about 50 wt % to about 81 wt %, based upon the total weight of the polyolefin composition, of a propylene ethylene 1-butene terpolymer having an ethylene derived units content ranging from about 1.5 wt % to about 6.0 wt %, based upon the total weight of the propylene ethylene 1-butene terpolymer, and 1-butene derived units content of between about 4.8 wt % and about 12.4 wt %, based upon the total weight of the propylene ethylene 1-butene terpolymer;
the sum of the amount of component A) and B) being 100;
the polyolefin composition being characterized by the following features:
molecular weight distribution (MWD), expressed in terms of Mw/Mn, greater than about 4.0;
the creep and recovery curve measured on the polymer fuse at 200° C. shows a maximum value between 600 and 1200 seconds, lower than about 53×10 −5 1/Pa.

2. The polyolefin composition according to claim 1 wherein component A) ranges from about 25 wt % to about 42 wt %, based upon the total weight of the polyolefin composition, and component B) ranges from about 58 wt % and about 75 wt %, based upon the total weight of the polyolefin composition.

3. The polyolefin composition according to claim 1 , wherein the ethylene derived units content in component A) ranges from about 2.6 wt % to about 5.2 wt %, based upon the total weight of the propylene ethylene copolymer.

4. The polyolefin composition according to claim 1 , wherein the ethylene derived units content in component B) ranges from about 1.9 wt % to about 4.8 wt %, based upon the total weight of the polyolefin composition; and the 1-butene derived units content ranges from about 5.1 wt % to about 10.3 wt %, based upon the total weight of the polyolefin composition.

5. The polyolefin composition according to claim 1 , wherein the creep and recovery curve measured on the polymer fuse at 200° C. shows a maximum value between 600 and 1200 seconds, lower than about 51×10 −5 1/Pa.

6. The polyolefin composition according to claim 1 , wherein the Melt Flow Rate (MFR 230° C. 2,16 kg) of the polyolefin composition ranges from about 0.9 to about 25 g/10 min.

7. The polyolefin composition according to claim 1 , wherein the ethylene derived units content ranges from about 1.5 wt % to about 6.0 wt %, based upon the total weight of the polyolefin composition.

8. The polyolefin composition according to claim 1 , wherein the 1-butene derived units content ranges from about 3.2 wt % to about 9.8 wt %, based upon the total weight of the polyolefin composition.

9. The polyolefin composition according to claim 1 , wherein the xylene soluble fraction at 25° C. and the seal initiation temperature (SIT) fulfill the following relation
SIT< 114−( XS× 1.3)

where:
XS=% by weight of the fraction soluble in xylene at 25° C., based upon the total weight of the polyolefin composition; and SIT=° C. is the seal initiation temperature (SIT).

10. A film comprising:
(i) a polyolefin composition comprising:
A) from about 19 wt % to about 50 wt %, based upon the total weight of the polyolefin composition, of a propylene ethylene copolymer having an ethylene derived units content ranging from about 1.5 wt % to about 6.0 wt %, based upon the total weight of the propylene ethylene copolymer;
B) from about 50 wt % to about 81 wt %, based upon the total weight of the polyolefin composition, of a propylene ethylene 1-butene terpolymer having an ethylene derived units content ranging from about 1.5 wt % and about 6.0 wt %, based upon the total weight of the propylene ethylene 1-butene terpolymer, and 1-butene derived units content of between about 4.8 wt % and about 12.4 wt %, based upon the total weight of the propylene ethylene 1-butene terpolymer;
the sum of the amount of component A) and B) being 100;
the polyolefin composition being characterized by the following features:
molecular weight distribution (MWD), expressed in terms of Mw/Mn, greater than about 4.0;
the creep and recovery curve measured on the polymer fuse at 200° C. shows a maximum value between 600 and 1200 seconds, lower than about 53×10 −5 1/Pa.

11. The film according to claim 10 , wherein the film is a biaxially oriented (BOPP) film.

12. A polyolefin composition comprising:
A) from about 19 wt % to about 50 wt %, based upon the total weight of the polyolefin composition, of a propylene ethylene copolymer having an ethylene derived units content ranging from about 1.5 wt % to about 6.0 wt %, based upon the total weight of the propylene ethylene copolymer and
B) from about 50 wt % to about 81 wt %, based upon the total weight of the polyolefin composition, of a propylene ethylene 1-butene terpolymer having an ethylene derived units content ranging from about 1.5 wt % to about 6.0 wt %, based upon the total weight of the propylene ethylene 1-butene terpolymer, and 1 -butene derived units content of between about 4.8 wt % and about 12.4 wt %, based upon the total weight of the propylene ethylene 1-butene terpolymer;
the sum of the amount of component A) and B) being 100 wt. %, based on the total weight of the polyolefin composition;
wherein the polyolefin composition being characterized by the following features:
a molecular weight distribution (MWD), expressed in terms of Mw/Mn, greater than about 4.0;
a creep and recovery curve measured on a polymer fuse at 200° C. shows a maximum value between 600 and 1200 seconds, lower than about 53×10 −5 1/Pa;

wherein the polyolefin composition is prepared by a process including:
(i) forming the propylene ethylene copolymer by polymerizing propylene with ethylene in a first stage,
(ii) forming the propylene ethylene 1-butene terpolymer by polymerizing propylene, ethylene and 1-butene in a second stage in the presence of a catalyst made containing the product of the reaction between:
(a) a solid catalyst component containing Ti, Mg, Cl and an electron donor compound containing from about 0.1 to about 50 wt. %, based on the total weight of the solid catalyst component, of Bi,
(b) an alkylaluminium compound, and
(c) an external electron-donor compound.

Assignees

• Basell Poliolefine Italia Srl

Inventors

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

Classifications

• C08J5/18 Primary

  Manufacture of films or sheets · CPC title

• C08L23/142 Primary

  at least partially crystalline copolymers of propene with other olefins · CPC title

• C08L23/14 Primary

  Copolymers of propene (C08L23/16 takes precedence) · CPC title

• C08L2201/10

  Transparent films; Clear coatings; Transparent materials · CPC title

• C08J2423/16

  Ethene-propene or ethene-propene-diene copolymers · CPC title