Composition comprising propylene-ethylene-1-butene terpolymers

Patent metadata

Field	Value
Publication number	US-10577492-B2
Application number	US-201615750772-A
Country	US
Kind code	B2
Filing date	Jul 19, 2016
Priority date	Aug 6, 2015
Publication date	Mar 3, 2020
Grant date	Mar 3, 2020

Abstract

A polyolefin composition made from or containing:
A) from 19 wt % to 50 wt % of a propylene ethylene copolymer having an ethylene derived units content ranging from 1.5 wt % to 6.0 wt; B) from 50 wt % to 81 wt % of a propylene ethylene 1-butene terpolymer having an ethylene derived units content ranging from 1.5 wt % and 6.0 wt % and 1-butene derived units content of between 4.8 wt % and 12.4 wt %;

wherein
the ratio C2 wt %/C4 wt % is between 0.22 and 3.0, where C2 wt % is the weight percent of ethylene derived units and C4 wt % is the weight percent of 1-butene derived units; the content of xylene soluble fraction at 25° C. is between 2 and 15 wt %; molecular weight distribution (MWD), expressed in terms of Mw/Mn, greater than 4.0; recoverable compliance at 200° C. having a maximum value between 800 and 1200 seconds, lower than 65×10 −5 Pa −1 .

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;
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 on 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 on the total weight of the propylene ethylene 1-butene terpolymer;
the sum of the amount of component A) and B) being 100 wt %;
the polyolefin composition being characterized by the following features:

 the ratio C2 wt %/C4 wt % between about 0.22 and about 2.5, based upon the total weight of the polyolefin composition, where C2 wt % is the weight percent of ethylene derived units and C4 wt % is the weight percent of 1-butene derived units;
 the content of xylene soluble fraction at 25° C. between about 2 and about 15 wt %, based upon the total weight of the polyolefin composition;
 molecular weight distribution (MWD), expressed in terms of Mw/Mn, greater than about 4.0;
 recoverable compliance at 200° C. having a maximum value between 800 and 1200 seconds of total creep and recovery time, lower than about 65×10 −5 Pa −1 .

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 % to 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 on the total weight of the propylene ethylene 1-butene terpolymer, and the 1-butene derived units content ranges from about 5.1 wt % to about 10.5 wt %, based on the total weight of the propylene ethylene 1-butene terpolymer.

5. The polyolefin composition according to claim 1 , wherein the recoverable compliance at 200° C. has a maximum value between 800 and 1200 seconds lower than about 60×10 −5 Pa −1 .

6. The polyolefin composition according to claim 1 , wherein the ethylene derived units content ranges from about 2.5 wt % to about 3.9 wt %, based upon the total weight of the polyolefin composition.

7. The polyolefin composition according to claim 1 , wherein the 1-butene derived units content ranges from about 5.3 wt % to about 6.9 wt %, based upon the total weight of the polyolefin composition.

8. The polyolefin composition according to claim 1 , wherein the melting temperature is lower than about 136.8° C.

9. The polyolefin composition according to claim 1 , wherein the seal initiation temperature (SIT) is between about 90 and about 109° C.

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 on 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 on the total weight of the propylene ethylene 1-butene terpolymer;

the sum of the amount of component A) and B) being 100 wt %;
the composition being characterized by the following features:
the ratio C2 wt %/C4 wt % between about 0.22 and about 2.5, based upon the total weight of the polyolefin composition, where C2 wt % is the weight percent of ethylene derived units and C4 wt % is the weight percent of 1-butene derived units;
the content of xylene soluble fraction at 25° C. between about 2 and about 15 wt %, based upon the total weight of the polyolefin composition;
molecular weight distribution (MWD), expressed in terms of Mw/Mn, greater than about 4.0;
recoverable compliance at 200° C. having a maximum value between 800 and 1200 seconds of total creep and recovery time, lower than about 65×10 −5 Pa −1 .

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

Assignees

• Basell Poliolefine Italia Srl

Inventors

• Felisati Andrea
• Ferraro Angelo
• Massari Paola
• Ciarafoni Marco
• Cavalieri Claudio
• Pantaleoni Roberto

Classifications

• B32B7/04

  Interconnection of layers · CPC title

• C08J2323/14

  Copolymers of propene (C08J2323/16 takes precedence) · CPC title

• B29C55/12

  biaxial · CPC title

• C08J5/18

  Manufacture of films or sheets · CPC title

• B32B2307/518

  bi-axially · CPC title