# US 9,518,176 B2 · High temperature geomembrane liners and master batch compositions

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- Number: US 9,518,176 B2
- Document ID: US9518176B2
- Status: Granted
- Kind: B2
- Application number: 14/271,011
- Filed: 2014-05-06
- Published: 2014-12-11
- Granted: 2016-12-13
- Earliest claimed: 2013-06-05
- Assignees: GSE Environmental, LLC
- Applicants: GSE Environmental, LLC
- Inventors: Yongyoot Prachoomdang; Yin Wu
- Web page: https://patentgrep.com/patent/US9518176B2

## CPC

- C08L 23/06: Polyethylene
- B09B 1/00: Dumping solid waste
- C08J 3/226: {using a polymer as a carrier}
- C08K 3/04: Carbon
- C08K 5/005: {Stabilisers against oxidation, heat, light, ozone}
- C08L 23/0815: {with aliphatic 1-olefins containing one carbon-to-carbon double bond}
- C08J 2323/04: Homopolymers or copolymers of ethene
- C08J 2423/04: Homopolymers or copolymers of ethene
- C08L 2201/08: Stabilised against heat, light or radiation or oxydation
- 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 2310/00: Masterbatches
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- B09B: DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

Geomembrane liners suitable for use at elevated temperatures up to 100° C., as well as master batch compositions suitable for preparing such geomembrane liners.

## Claims

### Claim 1

A composition for preparing a geomembrane liner for a containment system, wherein said composition is of: 1) a master batch; and 2) a base resin and wherein said composition comprises:
i) about 8-10 wt % of a master batch composition comprising
a) about 70 to about 80 wt % of a Linear Low Density Polyethylene (LLDPE), Medium Density Polyethylene (MDPE), High Density Polyethylene (HDPE), or Polyethylene of Raised Temperature (PERT) resin carrier has density from 0.910 to 0.955 g/cm3;
b) about 1 to about 3 wt % of a primary antioxidant, wherein said primary antioxidant comprises 1,3,5-trimethyl-2,4,6-tris-(3,5-di-t-butyl-4-hydroxybenzyl) benzene;
c) about 0.1 to about 0.5 wt % of a secondary antioxidant, wherein said secondary antioxidant comprises pentaerythritol tetrakis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate);
d) optionally, about 0.1 to about 0.5 wt % of tris (2,4-di-tert-butylphenyl) phosphite;
e) about 1 to about 3 wt % of a UV stabilizer, wherein said UV stabilizer comprises a hindered amine light stabilizer;
f) about 0.1 to about 0.5 wt % of an acid neutralizer; and
g) about 20 to about 30 wt % of a carbon black, wherein said carbon black is a furnace carbon black, and wherein the percentages by weight add up to 100% and are based on the total weight of the master batch composition; and
ii) about 90 to about 92 wt % of a base resin composition comprising Polyethylene of Raised Temperature (PERT) base resin, wherein the percentage by weight is based on the total weight of the geomembrane composition.

### Claim 2 (depends on 1)

The composition of master batch in claim 1, wherein said resin carrier is polyethylene of raised temperature (PERT).

### Claim 3 (depends on 1)

The composition of claim 1, wherein said hindered amine light stabilizer is 1,3,5-Triazine-2,4,6-triamine,N,N″′-[1,2-ethane-diyl-bis[[[4,6-bis[butyl(1,2,2,6,6-pentamethyl-4-piperidinyl)amino]-1,3,5-triazine-2-yl]imino]-3,1-propanediyl]].

### Claim 4 (depends on 1)

The composition of claim 1, wherein said acid neutralizer is hydrotalcite.

### Claim 5 (depends on 1)

A geomembrane liner prepared from the composition of claim 1, wherein said geomembrane liner has an oven aging performance for 1 year incubation @ 85° C. per ASTM D5721 such that 90% of high pressure OIT value retained per ASTM D5885.

### Claim 6 (depends on 1)

A geomembrane liner prepared from the composition of claim 1, wherein said geomembrane liner has an UV aging performance for 1 year UV exposure such that 70% of high pressure OIT value retained according to ASTM D5885.

### Claim 7 (depends on 1)

A geomembrane liner prepared from the composition of claim 1, wherein said geomembrane liner has a creep resistance according to modified ASTM D 5397 such that no failure occurred within 500 hours testing at 80° C.

### Claim 8 (depends on 1)

A geomembrane liner prepared from the composition of claim 1, wherein said geomembrane liner has an adequate solid state property at 100° C. such that a Young's Modulus of at least 38 Mpa according to ISO 527-1,2.

### Claim 9

A master batch composition comprising
a) about 70 to about 80 wt % of a Linear Low Density Polyethylene (LLDPE), Medium Density Polyethylene (MDPE), High Density Polyethylene (HDPE), or Polyethylene of Raised Temperature (PERT) resin carrier has density from 0.910 to 0.955 g/cm3;
b) about 1 to about 3 wt % of a primary antioxidant, wherein said primary antioxidant comprises 1,3,5-trimethyl-2,4,6-tris-(3,5-di-t-butyl-4-hydroxybenzyl) benzene;
c) about 0.1 to about 0.5 wt % of a secondary antioxidant, wherein said secondary antioxidant comprises pentaerythritol tetrakis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate);
d) optionally, about 0.1 to about 0.5 wt % of tris (2,4-di-tert-butylphenyl) phosphite;
e) about 1 to about 3 wt % of a UV stabilizer, wherein said UV stabilizer comprises a hindered amine light stabilizer;
f) about 0.1 to about 0.5 wt % of an acid neutralizer; and
g) about 20 to about 30 wt % of a carbon black, wherein said carbon black is a furnace carbon black, and wherein the percentages by weight add up to 100% and are based on the total weight of the master batch composition.

### Claim 10 (depends on 9)

A geomembrane liner prepared by letting down the master batch composition of claim 9 in a base resin (PERT).

### Claim 11 (depends on 10)

The geomembrane liner of claim 10, wherein said geomembrane liner comprises about 1100 to about 1400 ppm of said primary antioxidant; about 400 to about 500 ppm of said secondary antioxidant; about 0 to about 100 ppm of tris (2,4-di-tert-butylphenyl) phosphite; about 1200 to about 1500 ppm of said UV stabilizer; about 300 to about 400 ppm of said acid neutralizer; and about 20,000 to about 25,000 ppm of said carbon black.