# US 11,111,322 B2 · Low density ethylene-based polymers for low speed extrusion coating operations

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- Number: US 11,111,322 B2
- Document ID: US11111322B2
- Status: Granted
- Kind: B2
- Application number: 16/631,480
- Filed: 2018-07-13
- Published: 2020-07-02
- Granted: 2021-09-07
- Earliest claimed: 2017-07-28
- Assignees: Dow Global Technologies LLC
- Applicants: Dow Global Technologies LLC
- Inventors: Cornelis F. J. Den Doelder; Nhi T. Y. Dang; Eva-Maria Kupsch; Edward L. Lee
- Web page: https://patentgrep.com/patent/US11111322B2

## CPC

- C08F 110/02: Ethene
- B29C 48/022: {characterised by the choice of material}
- B29C 48/02: Small extruding apparatus, e.g. handheld, toy or laboratory extruders
- B29C 48/154: Coating solid articles, i.e. non-hollow articles
- C08F 4/38: Mixtures of peroxy-compounds
- C08F 2410/01: Additive used together with the catalyst, excluding compounds containing Al or B
- C08L 23/06: Polyethylene
- C08L 2201/10: Transparent films; Clear coatings; Transparent materials
- 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 2207/066: LDPE (radical process)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

A polyethylene homopolymer comprising the following properties: a) a melt index (I2) from 1.0 to 3.5 dg/min; b) a Mw(abs) versus I2 relationship: Mw(abs)≥A+B(I2), where A=3.20×105 g/mole, and B=−8.00×103 (g/mole)/(dg/min); c) a Mw(abs) versus I2 relationship: Mw(abs)≤C+D(I2), where C=3.90×105 g/mole, and D=−8.00×103 (g/mole)/(dg/min).

## Claims

### Claim 1

A polyethylene homopolymer comprising the following properties:
a) a melt index (I2) from 1.0 to 3.5 dg/min;
b) a Mw(abs) as determined by light scattering gel permeation chromatography versus I2 relationship: Mw(abs)≥A+B(I2), where A=3.20×105 g/mole, and B=−8.00×103 (g/mole)/(dg/min);
c) a Mw(abs) as determined by light scattering gel permeation chromatography versus I2 relationship: Mw(abs)≤C+D(I2), where C=3.90×105 g/mole, and D=−8.00×103 (g/mole)/(dg/min).

### Claim 2 (depends on 1)

The polyethylene homopolymer of claim 1, wherein the polyethylene homopolymer further comprises: d) a “weight fraction (w) of molecular weight greater than 106 g/mole, based on the total weight of polymer, and as determined by GPC(abs),” that meets the following relationship: w≥I+J(I2), where I=0.065, and J=−2.00×10−3 min/dg.

### Claim 3 (depends on 1)

The polyethylene homopolymer of claim 1, wherein the polyethylene homopolymer has a G′ value that meets the following relationship: G′>K+L*log(I2), where K=155 Pa and L=−20 Pa/log(dg/min).

### Claim 4 (depends on 1)

The polyethylene homopolymer of claim 1, wherein the polyethylene homopolymer has a G′ value≥150 Pa.

### Claim 5 (depends on 1)

The polyethylene homopolymer of claim 1, wherein the polyethylene homopolymer has a hexane extractable level≤3.0 wt%, based on the weight of the polyethylene homopolymer.

### Claim 6 (depends on 2)

The polyethylene polymer of claim 2, in which the polymer has a density from 0.916 to 0.921 g/cc.

### Claim 7 (depends on 1)

The polyethylene homopolymer of claim 1, wherein the polyethylene homopolymer is prepared in a reactor configuration comprising a tubular reactor.

### Claim 8

A composition comprising a polyethylene homopolymer, the polyethylene homopolymer comprising:
a) a melt index (I2) from 1.0 to 3.5 dg/min;
b) a Mw(abs) as determined by light scattering gel permeation chromatography versus I2 relationship: Mw(abs)≤A+B(I2), where A=3.20×105 g/mole, and B=−8.00×103 (g/mole)/(dg/min);
c) a Mw(abs) as determined by light scattering gel permeation chromatography versus I2 relationship: Mw(abs)≤C+D(I2), where C=3.90×105 g/mole, and D=−8.00×103 (g/mole)/(dg/min).

### Claim 9 (depends on 8)

The composition of claim 8, wherein the composition has a “neck-in” value≤140 mm, at a temperature from 290° C. to 320° C., a coating weight from 8 to 15 g/m2, and a line speed from 60 to 200 m/min.

### Claim 10 (depends on 8)

An article comprising at least one component formed from the composition of claim 8.