Multilayer film comprising propylene-ethylene-1-butene terpolymers

Patent metadata

Field	Value
Publication number	US-11028259-B2
Application number	US-201615750799-A
Country	US
Kind code	B2
Filing date	Jul 19, 2016
Priority date	Aug 6, 2015
Publication date	Jun 8, 2021
Grant date	Jun 8, 2021

Abstract

A multilayer film made from or containing a skin layer made from or containing 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 % andB) from 50 wt % to 81 wt % of a propylene ethylene 1-butene terpolymer having an ethylene derived units content ranging from 1.5 wt % to 6.0 wt % and 1-butene derived units content of between 4.8 wt % to 12.4 wt %;the sum of the amount of component A) and B) being 100;the composition being characterized by the following features:molecular weight distribution (MWD), expressed in terms of Mw/Mn, greater than 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 53×10−5 1/Pa.

First claim

What is claimed is:

1. A multilayer film comprising:
(i) a skin layer comprising
(a) 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 composition being characterized by the following features:

molecular weight distribution (MWD), expressed in terms of Mw/Mn, greater than about 4.0;
a xylene soluble fraction content at 0/25° C. is between 1.2 and 15.1 wt. %, based on the total weight of the polyolefin composition; and
the creep and recovery curve measured on the polymer fuse at 200° C. measured shows a maximum value between 600 and 1200 seconds, lower than about 53×10 −4 1/Pa;

wherein the polyolefin composition is made in the presence of a catalyst made from or containing the product of the reaction between:
(i) a solid catalyst component made from or containing Ti, Mg, Cl and an electron donor compound, containing 0.1 to 50 wt. % of Bi, based upon the total weight of the solid catalyst component;
(ii) an alkylaluminum compound, and
(iii) an external electron-donor compound.

2. The multilayer film according to claim 1 , wherein in the polyolefin composition 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 multilayer film according to claim 1 , wherein the polyolefin composition 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 multilayer film according to claim 1 , wherein in the polyolefin composition 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 propylene ethylene 1-butene terpolymer; 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 propylene ethylene 1-butene terpolymer.

5. The multilayer film according to claim 1 , wherein in the polyolefin composition 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 multilayer film according to claim 1 , wherein in the polyolefin composition 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.

7. The multilayer film according to claim 1 wherein in the polyolefin composition 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.

8. The multilayer film according to claim 1 having from 3 to 11 layers.

9. The multilayer film according to claim 1 having from 3 to 9 layers.

10. The multilayer film according to claim 1 having from 3 to 7 layers.

11. The multilayer film according to claim 1 having 3 or 5 layers.

12. The multilayer film according to claim 1 having an A/B/A or A/B/C structure and the A-layer as the skin layer.

Assignees

• Basell Poliolefine Italia Srl

Inventors

• Massari Paola
• Cathelin Caroline
• Cavalieri Claudio
• Ciarafoni Marco
• Felisati Andrea
• Ferraro Angelo
• Morini Giampiero
• Piemontesi Fabrizio
• Vitale Gianni

Classifications

• C08L23/142 Primary

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

• C08L2203/162

  sealable films · CPC title

• B32B27/32 Primary

  comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} · CPC title

• B32B27/08

  of synthetic resin · CPC title

• B32B2307/414

  Translucent · CPC title