# US 12,435,252 B2 · Adhesive polyethylene composition

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- Number: US 12,435,252 B2
- Document ID: US12435252B2
- Status: Granted
- Kind: B2
- Application number: 18/005,020
- Filed: 2021-07-08
- Published: 2023-08-10
- Granted: 2025-10-07
- Earliest claimed: 2020-07-13
- Assignees: Borealis AG
- Applicants: Borealis AG
- Inventors: Katja Klimke; John Jamieson; Jari-Jussi Ruskeeniemi; Floran Prades; Noureddine Ajellal; Tua Sundholm; Jouni Purmonen; Angelica Legras; Andreas Albrecht
- Web page: https://patentgrep.com/patent/US12435252B2

## CPC

- C09J 123/0869: {Acids or derivatives thereof}
- B32B 1/08: Tubular products
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 15/085: comprising polyolefins
- B32B 27/08: of synthetic resin
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- C08F 210/16: Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
- C09J 123/0815: {Copolymers of ethene with aliphatic 1-olefins}
- C09J 123/26: modified by chemical after-treatment
- C09J 151/06: grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
- F16L 9/147: comprising only layers of metal and plastics with or without reinforcement
- B32B 15/18: comprising iron or steel {(B32B15/011, B32B15/012 and B32B15/013 take precedence)}
- B32B 2255/06: on metal layer
- B32B 2255/26: Polymeric coating
- B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers
- B32B 2307/714: Inert, i.e. inert to chemical degradation, corrosion
- B32B 2307/748: Releasability
- B32B 2597/00: Tubular articles, e.g. hoses, pipes
- C08F 2/001: {Multistage polymerisation processes characterised by a change in reactor conditions without deactivating the intermediate polymer (C08F295/00, C08F297/00 take precedence)}
- C08F 2/06: Organic solvent
- C08F 4/65912: {in combination with an organoaluminium compound}
- C08F 4/65916: {supported on a carrier, e.g. silica, MgCl2, polymer}
- C08L 2203/18: used for pipes
- 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 2314/06: Metallocene or single site catalysts
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

The present invention relates to an adhesive polyethylene composition comprising (A) from 60 to 90 wt % of a non-elastomeric polyethylene; (B) from 9.0 to 38 wt % of an ethylene based elastomer being a copolymer of ethylene and alpha-olefin comonomer units having from 4 to 12 carbon atoms; wherein onto component (A) or components (A) and (B) an acid grafting agent (C) has been grafted in an amount of from 0.01 to 3.0 wt %, all based on the total weight of the adhesive polyethylene composition, a multi-layer structure comprising said adhesive polyethylene composition and the use of said adhesive polyethylene composition for the production of a multi-layer structure.

## Claims

### Claim 1

An adhesive polyethylene composition comprising
(A) from 60 to 90 wt % of a non-elastomeric polyethylene;
(B) from 9.0 to 38 wt % of an ethylene based elastomer being a copolymer of ethylene and alpha-olefin comonomer units having from 4 to 12 carbon atoms, which has a density in the range of from 840 to 900 kg/m3;
wherein onto components (A) and (B) an acid grafting agent (C) has been grafted in an amount of from 0.01 to 3.0 wt %, all based on the total weight of the adhesive polyethylene composition.

### Claim 2 (depends on 1)

The adhesive polyethylene composition according to claim 1, wherein the non-elastomeric polyethylene (A) is a copolymer of ethylene and one or more comonomer units selected from alpha-olefins having from 4 to 12 carbon atoms.

### Claim 3 (depends on 1)

The adhesive polyethylene composition according to claim 1, wherein the acid grafting agent (C) is selected from unsaturated carboxylic acids or derivatives thereof.

### Claim 4 (depends on 1)

The adhesive polyethylene composition according to claim 1, having a polydispersity index PDI (LS), being the ratio of Mw/Mn of from 1.5 to 4.5, determined by GPC-VISC-LS analysis.

### Claim 5 (depends on 1)

The adhesive polyethylene composition according to claim 1, having an elasticity index at a loss modulus G″=0.5 kPa EI(0.5 kPa) of from 75 to 320 Pa.

### Claim 6 (depends on 1)

The adhesive polyethylene composition according to claim 1, having only one peak in the GPC curve, which is defined below in the measurement methods as the concentration normalized LS 15 signal along the molecular weight of conventional GPC, obtained from the GPC-VISC-LS analysis.

### Claim 7 (depends on 2)

The adhesive polyethylene composition according to claim 2, wherein the non-elastomeric polyethylene (A) is a copolymer of ethylene and one single comonomer selected from alpha-olefins having from 4 to 12 carbon atoms.

### Claim 8 (depends on 2)

The adhesive polyethylene composition according to claim 2, wherein the non-elastomeric polyethylene (A) is a terpolymer of ethylene and two comonomers selected from alpha-olefins having from 4 to 12 carbon atoms.

### Claim 9 (depends on 1)

The adhesive polyethylene composition according to claim 1, obtained from a process comprising the steps of:
feeding components (A), (B) and (C) into an extruder into the feeding section of an extruder comprising a feeding section, a barrel section and a die plate, wherein the barrel section of the extruder downstream of the feeding section and upstream of the die plate is divided into a plurality of control zones, and the first control zone represents the first control zone within the barrel section downstream of the feeding zone in which the fed component(s) (A) and/or (B) start(s) to melt;
compounding the components (A) and (B) in the extruder in order to form the adhesive polyethylene composition; and
grafting components (A) and (B) with component (C) during the compounding step.

### Claim 10 (depends on 9)

The adhesive polyethylene composition according to claim 9, wherein the temperature of the second to the last control zone in the barrel section is maintained constant over all of these control zones with a total deviation of not more than 20° C.

### Claim 11 (depends on 9)

The adhesive polyethylene composition according to claim 9, wherein the process further comprises the step of:
independently controlling the temperature of each control zone of the plurality of control zones of the barrel section of the extruder as such that
a) the temperature in the first control zone of the barrel section downstream of the feeding section is in the range of from higher than 85° C. to 180° C.,
b) the temperature of the control zones of the barrel section from the first control zone of the barrel section downstream the feeding section to the control zone in the middle of the barrel section is increased over the length of the barrel section in two or more steps so that the temperature of the control zone in the middle of the barrel section is from 105% to 145% of the temperature in the first control zone of the barrel section downstream of the feeding section; and
c) the temperature of the control zones of the barrel section from control zone in the middle of the barrel section to the control zone of the barrel section directly upstream of the die plate in maintained at the same temperature or increased to a temperature of not more than 120% of the temperature of the control zone in the middle of the barrel section.

### Claim 12 (depends on 1)

A multi-layer structure comprising one layer comprising the adhesive polyethylene composition according to claim 1.

### Claim 13 (depends on 12)

The multi-layer structure according to claim 12, being a three-layer coating of a metal pipe.

### Claim 14 (depends on 12)

The multi-layer structure according to claim 12, having a peel strength at 23° C. of at least 350 N/cm and/or a peel strength at 80° C. of at least 60 N/cm.