# US 8,465,816 B2 · Polyethylene pipe resins

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- Number: US 8,465,816 B2
- Document ID: US8465816B2
- Status: Granted
- Kind: B2
- Application number: 10/561,796
- Filed: 2004-06-18
- Published: 2006-07-13
- Granted: 2013-06-18
- Earliest claimed: 2003-07-04
- Assignees: Ineos Manufacturing Belgium NV
- Applicants: Serge Jean Henri Bettonville; Virgile Joel Maurice Rouyer
- Inventors: Serge Jean Henri Bettonville; Virgile Joel Maurice Rouyer
- Web page: https://patentgrep.com/patent/US8465816B2

## CPC

- C08L 23/04: Homopolymers or copolymers of ethene
- C08L 23/0876: Salts thereof, i.e. ionomers
- C08L 51/06: grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
- Y10T 428/13: Hollow or container type article [e.g., tube, vase, etc.]
- Y10T 428/1352: Polymer or resin containing [i.e., natural or synthetic]
- Y10T 428/1393: Multilayer [continuous layer]
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A pressure pipe resin is disclosed comprising from 90 to 99.9 wt %, based on the total weight of the resin, of a polyethylene, and from 0.1 to 10 wt %, based on the total weight of the blend, of an ionomer.

## Claims

### Claim 1

Pressure pipe resin comprising from 90 to 99.9 wt %, based on the total weight of the resin, of a polyethylene comprising from 35 to 60 wt % of a high molecular weight fraction having a density of up to 0.930 g/cm3 and from 40 to 65 wt % of a low molecular weight fraction having a density of at least 0.965 g/cm3, and from 0.1 to 10 wt %, based on the total weight of the resin, of an ionomer, which resin has an extrapolated 20° C./50 years stress at a 97.5% confidence level of at least 10 MPa (PE 100) according to ISO 9080.

### Claim 2 (depends on 1)

Pressure pipe resin according to claim 1, wherein the quantity of ionomer in the resin is between 0.5 and 6 wt % based on the total weight of the blend.

### Claim 3 (depends on 2)

Pressure pipe resin according to claim 2, wherein the quantity of ionomer in the resin is between 1 and 2 wt % based on the total weight of the blend.

### Claim 4 (depends on 1)

Pressure pipe resin according to claim 1, wherein the ionomer has a polyethylene backbone and has a density of at least 0.930 g/cm3.

### Claim 5 (depends on 1)

Pressure pipe resin according to claim 1, wherein the ionomer is a grafted metal salt of an ethylene and maleic anhydride copolymer.

### Claim 6 (depends on 1)

Pressure pipe resin according to claim 1, wherein the polyethylene resin comprises from 35 to 49 wt % of a first polyethylene fraction of high molecular weight, and from 51 to 65 wt % of a second polyethylene fraction of low molecular weight, the first polyethylene fraction comprising a linear low density polyethylene having a density of up to 0.928 g/cm3 and an HLMI of less than 0.6 g/10 min, and the second polyethylene fraction comprising a high density polyethylene having a density of at least 0.969 g/cm3 and an MI2 of greater than 100 g/10 min, and the polyethylene resin having a density of greater than 0.940 g/cm3 and an HLMI of from 1 to 100 g/10 min.

### Claim 7 (depends on 1)

Pressure pipe comprising a resin as defined in claim 1.