# US 11,028,259 B2 · Multilayer film comprising propylene-ethylene-1-butene terpolymers

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- Number: US 11,028,259 B2
- Document ID: US11028259B2
- Status: Granted
- Kind: B2
- Application number: 15/750,799
- Filed: 2016-07-19
- Published: 2018-08-09
- Granted: 2021-06-08
- Earliest claimed: 2015-08-06
- Assignees: Basell Poliolefine Italia S.r.l.
- Applicants: Basell Poliolefine Italia S.R.L.
- Inventors: Paola Massari; Caroline Cathelin; Claudio Cavalieri; Marco Ciarafoni; Andrea Felisati; Angelo Ferraro; Giampiero Morini; Fabrizio Piemontesi; Gianni Vitale
- Web page: https://patentgrep.com/patent/US11028259B2

## CPC

- C08L 23/142: {at least partially crystalline copolymers of propene with other olefins}
- B32B 27/08: of synthetic resin
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- C08L 23/14: Copolymers of propene (C08L23/16 takes precedence)
- B32B 2250/242: All polymers belonging to those covered by group B32B27/32
- B32B 2250/40: Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
- B32B 2307/412: Transparent
- B32B 2307/414: Translucent
- B32B 2307/548: Creep
- B32B 2307/732: Dimensional properties
- B32B 2307/75: Printability
- C08L 2201/10: Transparent films; Clear coatings; Transparent materials
- C08L 2203/162: sealable films
- C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
- C08L 2308/00: Chemical blending or stepwise polymerisation process with the same catalyst
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM

## 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 % and 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 % 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.

## Claims

### Claim 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 53×10−41/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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1)

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.

### Claim 4 (depends on 1)

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.

### Claim 5 (depends on 1)

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 51×10−51/Pa.

### Claim 6 (depends on 1)

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.

### Claim 7 (depends on 1)

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.

### Claim 8 (depends on 1)

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

### Claim 9 (depends on 1)

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

### Claim 10 (depends on 1)

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

### Claim 11 (depends on 1)

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

### Claim 12 (depends on 1)

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.