# US 10,501,616 B2 · Propylene-based composition for pipes

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- Number: US 10,501,616 B2
- Document ID: US10501616B2
- Status: Granted
- Kind: B2
- Application number: 16/338,904
- Filed: 2017-09-22
- Published: 2019-11-07
- Granted: 2019-12-10
- Earliest claimed: 2016-10-06
- Assignees: Basell Poliolefine Italia S.r.l.
- Applicants: Basell Poliolefine Italia S.R.L.
- Inventors: Monica Galvan; Claudio Cavalieri; Francesca Tisi; Giampaolo Pellegatti; Thomas Boehm
- Web page: https://patentgrep.com/patent/US10501616B2

## CPC

- C08L 23/20: having four to nine carbon atoms
- C08F 210/06: Propene
- C08F 210/16: Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
- C08L 23/04: Homopolymers or copolymers of ethene
- C08L 23/10: Homopolymers or copolymers of propene
- C08L 2203/18: used for pipes
- C08L 2205/02: containing two or more polymers of the same C08L -group
- 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 2205/03: containing three or more polymers in a blend
- C08L 2314/02: Ziegler natta catalyst
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

A polyolefin composition made from or containing: A) from 85.0 wt % to 99.5 wt % of a propylene 1-hexene copolymer, based upon the weight of the polyolefin composition and B) from 0.5 wt % to 15.0 wt % of a propylene, ethylene copolymer composition, based upon the weight of the polyolefin composition, made from or containing: b1) from 12 wt % to 52 wt % of a propylene homopolymer or a propylene/ethylene copolymer, based upon the weight of the propylene, ethylene copolymer composition and b2) from 48 wt % to 88 wt % of a propylene ethylene copolymer, based upon the weight of the propylene, ethylene copolymer composition, having a content of ethylene derived units ranging from 15.0 wt % to 42.0 wt %; wherein the polyolefin composition has a melt flow rate (230° C./5 kg. ISO 1133) ranging from 0.2 g/10 min to 4.0 g/10 min; the sum A+B being 100 and the sum b1+b2 being 100.

## Claims

### Claim 1

A polyolefin composition comprising:
A) from 85.0 wt % to 99.5 wt % of a propylene 1-hexene copolymer, based upon the weight of the polyolefin composition, wherein:
(i) the content of 1-hexene derived units ranges from 0.6 wt % to 6.0%, based upon the weight of the propylene 1-hexene copolymer;
ii) the melt flow rate (MFR) (ISO 1133 230° C., 5 kg) ranges from 0.6 to 5.0 g/10 min;
iii) the xylene soluble content measured at 25° C. lower than 10 wt %, based upon the weight of the propylene 1-hexene copolymer; and
B) from 0.5 wt % to 15.0 wt % of a propylene, ethylene copolymer composition, based upon the weight of the polyolefin composition, comprising:
b1) from 12 wt % to 52 wt %, based upon the weight of the propylene, ethylene copolymer composition, of a propylene homopolymer or a propylene/ethylene copolymer having a content of ethylene derived units ranging from 0.1 wt % to 4.5 wt %, based upon the weight of the propylene/ethylene copolymer; and having a xylene soluble content measured at 25° C. lower than 10 wt %, based upon the weight of the propylene homopolymer or the propylene/ethylene copolymer; and
b2) from 48 wt % to 88 wt %, based upon the weight of the propylene, ethylene copolymer composition, of a propylene ethylene copolymer having a content of ethylene derived units ranging from 15.0 wt % to 42.0 wt %, based upon the weight of the propylene ethylene copolymer;
wherein the polyolefin composition has a melt flow rate (230° C./5 kg. ISO 1133) ranging from 0.2 g/10 min to 4.0 g/10 min; the sum A+B being 100; and the sum b1+b2 being 100; and the copolymers having only two type of monomers.

### Claim 2 (depends on 1)

The polyolefin composition according to claim 1 wherein the content of 1-hexene derived units in component A) ranges from 1.0 wt % to 4.5 wt %, based upon the weight of the propylene 1-hexene copolymer.

### Claim 3 (depends on 1)

The polyolefin composition according to claim 1 wherein the content of 1-hexene derived units in component A) ranges from 2.5 wt % to 3.9 wt %, based upon the weight of the propylene 1-hexene copolymer.

### Claim 4 (depends on 1)

The polyolefin composition according to claim 1 wherein the content of 1-hexene derived units in component A) ranges from 2.8 wt % to 3.7 wt %, based upon the weight of the propylene 1-hexene copolymer.

### Claim 5 (depends on 1)

The polyolefin composition according to claim 1 wherein component b2) is a propylene ethylene copolymer having an content of ethylene derived units ranging from 18 wt % to 38 wt %, based upon the weight of the propylene ethylene copolymer, and an intrinsic viscosity of the xylene soluble fraction at 25° C. ranging from 2.0 dl/g to 5.0 dl/g.

### Claim 6 (depends on 1)

The polyolefin composition according to claim 1 wherein the melt flow rate (MFR) (ISO 1133 230° C., 5 kg) of component A) ranges from 0.9 to 2.5 g/10 min.

### Claim 7 (depends on 1)

The polyolefin composition according to claim 1 wherein in component A) the melting temperature (DSC) ranges from 155° C. to 130° C. and the melt flow rate (MFR) (ISO 1133 230° C., 5 kg) of component A) ranges from 0.9 to 2.5 g/10 min.

### Claim 8 (depends on 1)

The polyolefin composition according to claim 1 having a melt flow rate (230° C./5 kg. ISO 1133) ranging from 0.4 g/10 min to 3.0 g/10 min.

### Claim 9 (depends on 1)

An article comprising a polyolefin composition according to claim 1, wherein the article is a pipe system or a pipe sheet.

### Claim 10 (depends on 9)

The article of claim 9, wherein the pipe system or pipe sheet has a multilayer structure comprising more than one layer, wherein at least one layer comprises the polyolefin composition.