# US 8,784,996 B2 · Extrusion coating composition

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- Number: US 8,784,996 B2
- Document ID: US8784996B2
- Status: Granted
- Kind: B2
- Application number: 13/511,566
- Filed: 2010-11-24
- Published: 2013-01-17
- Granted: 2014-07-22
- Earliest claimed: 2009-11-24
- Assignees: Dow Global Technologies LLC
- Applicants: Thomas Oswald; Wayde V. Konze; Mehmet Demirors
- Inventors: Thomas Oswald; Wayde V. Konze; Mehmet Demirors
- Web page: https://patentgrep.com/patent/US8784996B2

## CPC

- C08L 23/0815: {with aliphatic 1-olefins containing one carbon-to-carbon double bond}
- C08F 210/16: Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
- C08L 23/08: Copolymers of ethene (C08L23/16 takes precedence)
- C08L 2205/02: containing two or more polymers of the same C08L -group
- C08L 2207/07: Long chain branching
- C08L 2308/00: Chemical blending or stepwise polymerisation process with the same catalyst
- Y10T 428/31938: Polymer of monoethylenically unsaturated hydrocarbon
- Y10T 442/20: Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
- Y10T 442/2025: Coating produced by extrusion
- Y10T 442/60: Nonwoven fabric [i.e., nonwoven strand or fiber material]
- Y10T 442/674: Nonwoven fabric with a preformed polymeric film or sheet
- 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
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Multimodal polyethylene compositions are provided. Extrusion compositions including the multimodal polyethylene are provided. The extrusion composition further include a high pressure low density polyethylene and optionally other additives and/or polyethylenes. Extruded articles made from the polyethylene extrusion compositions are also provided.

## Claims

### Claim 1

An extrusion composition comprising from 80% to 98% a multimodal polyethylene and 2% to 20% LDPE wherein the multimodal polyethylene is characterized by:
a. Mw(abs)/Mw(RI)>1.05 and <1.6;
b. Mz(measured)/ Mz(calc)>1.4 and <3.0 where Mz(calc) is calculated from the measured I2 according to Mz(calc)=1.5*10(5.077−0.284*log 10)(I2));
c. I2>8.0 g/10 minutes and <15.0 g/10 minutes;
d. CDF(RI fraction)>0.01 at a log 10(Mw) of 5.5; and
e. density in the range 0.860-0.965 g/cc; and
the LDPE is characterized by having a I2 less than 10 g/10 minutes and greater than 0.2 g/10 minutes, and a Mw(abs)/Mw(RI)>2.0.

### Claim 2 (depends on 1)

The extrusion composition of claim 1 wherein the composition comprises from 91% to 97% multimodal polyethylene and 3% to 9% LDPE and further wherein the multimodal polyethylene is characterized by:
a. Mw(abs)/Mw (RI)>1.10 and <1.20;
b. Mz(measured)/ Mz(calc)>1.5 and <2.5;
c. I2>9.0 g/10 minutes and <12.0 g/10 minutes;
d. CDF(RI fraction)>0.02 at a log 10(Mw) of 5.5; and
e. MWD>3.0 and <3.5; and
the LDPE is characterized by having a I2 less than 1.0 g/10 minutes and greater than 0.3 g/10 minutes, and the Mw(abs)/Mw (RI) is >3.2.

### Claim 3

An article comprising at least one layer of an ethylene polymer extrusion composition, wherein the extrusion composition comprises from 80% to 98% multimodal polyethylene and 2% to 20% LDPE wherein the multimodal polyethylene is characterized by:
a. Mw(abs)/Mw (RI)>1.05 and <1.6;
b. Mz(measured)/ Mz(calc)>1.4 and <3.0 where Mz(calc) is calculated from the measured I2 according to Mz(calc)=1.5*10(5.077−0.284*log 10(I2));
c. I2>9.0 g/10 minutes and <15.0 g/10 minutes;
d. CDF (RI fraction)>0.01 at a log 10(Mw) of 5.5; and
e. density in the range 0.860-0.965 g/cc; and
the LDPE is characterized by having a I2 less than 10 g/10 minutes and greater than 0.2 g/10 minutes, and a Mw(abs)/Mw(RI)>2.0.

### Claim 4 (depends on 3)

The article of claim 3, wherein the article is in the form of an extrusion profile, an extrusion coating onto a substrate or an extrusion cast film.

### Claim 5 (depends on 4)

The article of claim 4 wherein the article is an extrusion coating onto a substrate and the substrate is a woven or non-woven fabric.

### Claim 6 (depends on 3)

The article of claim 3, wherein the at least one layer of an ethylene polymer composition is a sealant layer, adhesive layer, abuse resistance layer, or release surface.

### Claim 7 (depends on 6)

The article of claim 6 wherein the article is a sealant layer and wherein the density of the multimodal polyethylene is <0.915 g/cc.

### Claim 8 (depends on 6)

The article of claim 6 wherein the article is a release surface wherein density of the multimodal polyethylene is >0.940 g/cc.