# US 8,569,418 B2 · Polyolefin compositions

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- Number: US 8,569,418 B2
- Document ID: US8569418B2
- Status: Granted
- Kind: B2
- Application number: 13/378,952
- Filed: 2010-06-23
- Published: 2012-05-31
- Granted: 2013-10-29
- Earliest claimed: 2009-06-26
- Assignees: Basell Poliolefine Italia S.r.l.
- Applicants: Monica Galvan; Marco Ciarafoni; Roberto Pantaleoni; Angelo Ferraro
- Inventors: Monica Galvan; Marco Ciarafoni; Roberto Pantaleoni; Angelo Ferraro
- Web page: https://patentgrep.com/patent/US8569418B2

## CPC

- C08J 5/18: Manufacture of films or sheets
- C08L 23/10: Homopolymers or copolymers of propene
- C08J 2323/10: Homopolymers or copolymers of propene
- C08L 23/0807: with unsaturated hydrocarbons only containing four or more carbon atoms
- C08L 23/0815: {with aliphatic 1-olefins containing one carbon-to-carbon double bond}
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

Polyolefin compositions particularly suitable for cast film, exhibiting heat sealability, retortability, low haze and stiffness, comprising: 1) 75-85% of a propylene homopolymer or copolymer of propylene with ethylene and/or one or more C4-C10 α-olefin(s), the homopolymer or copolymer having melting temperature equal to or higher than 150° C., 2) 15-25% of a copolymer of ethylene with one or more C4-C10 α-olefin(s) containing from 20 to 30% of said C4-C10 α-olefin(s); said composition having MFR (at 230° C., 2.16 kg) of from 5-10 g/10 min, the total content of ethylene of from 10 to 20%, the total content of C4-C10 α-olefin(s) of from 2 to 8%, the ratio XStot/XSm of the total fraction soluble in Xylene at room temperature to the fraction soluble in Xylene at room temperature of the matrix component (1) of from 5 to 15, and the value of the intrinsic viscosity of the total fraction soluble in Xylene at room temperature (XSIVtot) of 1.5 dl/g or less.

## Claims

### Claim 1

An article comprising a polyolefin composition comprising, in percent by weight referred to the sum of component 1) and 2):
(1) 75-85 wt % of a propylene homopolymer or copolymer of propylene with at least one of ethylene and C4-C10 α-olefin(s), the homopolymer or copolymer having melting temperature equal to or higher than 150° C., and
(2) 15-25% of a copolymer of ethylene with at least one C4-C10 α-olefin containing from 20 to 30% of said C4-C10 α-olefin;
said composition having
(i) a value of MFR at 230° C., 2.16 kg of from 5 to 10 g/10 min,
(ii) a total content of ethylene of from 10 to 20%,
(iii) a total content of C4-C10 α-olefin of from 2 to 8%,
(iv) a ratio XStot/XSm of the total fraction soluble in xylene at room temperature to the fraction soluble in xylene at room temperature of the component (1) of from 5 to 15, and
(v) a value XSIVtot of the intrinsic viscosity of the total fraction soluble in xylene at room temperature of 1.5 dl/g.

### Claim 2 (depends on 1)

The article of claim 1, wherein the fraction soluble in xylene at room temperature of component (1) is at most 2 wt %.

### Claim 3 (depends on 1)

The article of claim 1, wherein component (1) is a copolymer of propylene and the amount of units derived from the at least one ethylene and C4-C10 α-olefin is at most 1.5 wt % of the component (1).

### Claim 4

A process for producing a polyolefin composition comprising:
polymerizing olefins in at least two sequential polymerization stages with each subsequent polymerization stage being conducted in the presence of the polymeric material formed in the immediately preceding polymerization stage thereby producing the polyolefin composition comprising:
comprising, in percent by weight referred to the sum of component 1) and 2):
1) 75-85 wt % of a propylene homopolymer or copolymer of propylene with at least one of ethylene and C4-C10 α-olefin(s), the homopolymer or copolymer having melting temperature equal to or higher than 150° C., and
2) 15-25% of a copolymer of ethylene with at least one C4-C10 α-olefin containing from 20 to 30% of said C4-C10 α-olefin;
said composition having
(i) a value of MFR at 230° C., 2.16 kg of from 5 to 10 g/10 min,
(ii) a total content of ethylene of from 10 to 20%,
(iii) a total content of C4-C10 α-olefin of from 2 to 8%,
(iv) a ratio XStot/XSm of the total fraction soluble in xylene at room temperature to the fraction soluble in xylene at room temperature of the component (1) of from 5 to 15, and
(v) a value XSIVtot of the intrinsic viscosity of the total fraction soluble in xylene at room temperature of 1.5 dl/g.

### Claim 5 (depends on 1)

The article of claim 1 wherein the article is a film.

### Claim 6 (depends on 5)

The article of claim 5 wherein the film is a cast film.

### Claim 7 (depends on 1)

The article of claim 1 wherein the article is an injection molded article.