# US 12,006,378 B2 · Polyethylene and its chlorinated polyethylene

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,006,378 B2
- Document ID: US12006378B2
- Status: Granted
- Kind: B2
- Application number: 17/294,896
- Filed: 2020-09-25
- Published: 2022-01-20
- Granted: 2024-06-11
- Earliest claimed: 2019-09-27
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Cheolhwan Jeong; Si Jung Lee; Sun Mi Kim; Ue Ryung Seo; Yi Young Choi; Bog Ki Hong
- Web page: https://patentgrep.com/patent/US12006378B2

## CPC

- C08F 110/02: Ethene
- C08F 4/02: Carriers therefor
- C08F 4/65922: {containing at least two cyclopentadienyl rings, fused or not}
- C08F 8/20: Halogenation
- C08F 4/65912: {in combination with an organoaluminium compound}
- C08F 4/65916: {supported on a carrier, e.g. silica, MgCl2, polymer}
- C08F 2410/02: Anti-static agent incorporated into the catalyst
- C08F 2420/00: Metallocene catalysts
- C08F 2420/02: Cp or analog bridged to a non-Cp X anionic donor
- C08F 2420/07: Heteroatom-substituted Cp, i.e. Cp or analog where at least one of the substituent of the Cp or analog ring is or contains a heteroatom
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

There are provided a polyethylene capable of improving tensile strength while maintaining excellent processability and Mooney viscosity characteristics when preparing a chlorinated polyethylene compound by implementing a molecular structure having a low content of low molecular weight and a high content of high molecular weight, and a chlorinated polyethylene prepared using the same.

## Claims

### Claim 1

A polyethylene having a density of 0.945 g/cm3 or more when measured in accordance with ASTM D-1505,
wherein a fraction of an area representing a high molecular weight content of log Mw>6.0 is 4 to 12%,
a fraction of an area representing a medium molecular weight content of 4.5<log Mw<5.0 is 35 to 50%, and
a fraction of an area representing a low molecular weight content of log Mw<4.0 is 10% or less,
relative to a total area of a molecular weight distribution curve drawn with a log value of weight average molecular weight as the x axis and a molecular weight distribution with respect to the log value as the y axis using gel permeation chromatography, and
an entanglement molecular weight (Me) of the following Equation 1 is from 27,000 to 52,000 g/mol:
Me=(ρRT)/GN0 [Equation 1]
wherein
ρ is a density (kg/m3) of polyethylene measured in accordance with ASTM D-1505×0.8,
R is a gas constant of polyethylene of 8.314 Pa·m3/mol·K,
T is an absolute temperature of the measured temperature, and
GN0 is a plateau modulus of polyethylene, which is a storage modulus when a loss modulus has a minimum value in a region where the storage modulus is greater than the loss modulus, wherein the storage modulus and loss modulus are measured while changing an angular frequency to 0.05 to 500 rad/s under conditions of 190° C. and 0.5% strain using a rotary rheometer.

### Claim 2 (depends on 1)

The polyethylene of claim 1, wherein the density of the polyethylene is 0.945 to 0.955 g/cm3 when measured in accordance with ASTM D-1505.

### Claim 3 (depends on 1)

The polyethylene of claim 1, wherein a fraction of an area representing an ultra-high molecular weight content of 6.5<log Mw relative to a total area of a molecular weight distribution curve is 0.1 to 3% in the molecular weight distribution curve drawn using gel permeation chromatography.

### Claim 4 (depends on 1)

The polyethylene of claim 1, wherein a fraction of an area representing an ultra-low molecular weight content of log Mw<3.5 is 2% or less, and a fraction of an area representing a low molecular weight content of 3.5≤log Mw<4.0 is 7% or less in the molecular weight distribution curve.

### Claim 5 (depends on 1)

The polyethylene of claim 1, wherein the polyethylene has a melt index of 0.5 to 3 g/10 min when measured at a temperature of 190° C. under a load of 5 kg in accordance with ASTM D 1238.

### Claim 6 (depends on 1)

The polyethylene of claim 1, wherein the polyethylene has a melt flow rate ratio obtained by dividing MFR21.6 measured at 190° C. under a load of 21.6 kg in accordance with ASTM D 1238 by MFR5.0 measured at 190° C. under a load of 5.0 kg in accordance with ASTM D 1238 of 10 to 20.

### Claim 7 (depends on 1)

The polyethylene of claim 1, wherein the polyethylene has a weight average molecular weight of 150,000 to 300,000 g/mol.

### Claim 8 (depends on 1)

The polyethylene of claim 1, wherein the polyethylene has a molecular weight distribution of 5 to 15.

### Claim 9 (depends on 1)

The polyethylene of claim 1, wherein the polyethylene has an MDR torque of 7 to 12 Nm when measured at 180° C. for 10 min using a moving die rheometer.

### Claim 10 (depends on 1)

The polyethylene of claim 1, wherein the polyethylene is an ethylene homopolymer.

### Claim 11 (depends on 1)

the polyethylene of claim 1, wherein the density of the polyethylene is 0.945 to 0.955 g/cm3.