# US 12,005,681 B2 · Solid oxygen absorbing film

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

- Number: US 12,005,681 B2
- Document ID: US12005681B2
- Status: Granted
- Kind: B2
- Application number: 15/363,882
- Filed: 2016-11-29
- Published: 2017-03-23
- Granted: 2024-06-11
- Earliest claimed: 2015-06-16
- Assignees: Multisorb Technologies, Inc.
- Applicants: Multisorb Technologies, Inc.
- Inventors: Narasimharao Dontula
- Web page: https://patentgrep.com/patent/US12005681B2

## CPC

- B32B 27/08: of synthetic resin
- C08J 5/18: Manufacture of films or sheets
- A23B 2/712: in which an absorbent is placed or used (packages for foodstuffs with provision for absorbing fluids B65D81/26)
- A23B 2/717: Oxygen absorbent
- B01J 20/02: comprising inorganic material
- B01J 20/0229: {Compounds of Fe}
- B01J 20/103: {comprising silica}
- B01J 20/14: Diatomaceous earth
- B01J 20/262: {obtained otherwise than by reactions only involving carbon to carbon unsaturated bonds, e.g. obtained by polycondensation (macromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds per se C08G)}
- B01J 20/28026: {Particles within, immobilised, dispersed, entrapped in or on a matrix, e.g. a resin}
- C08L 101/00: Compositions of unspecified macromolecular compounds
- B32B 2307/724: Permeability to gases, adsorption
- C08J 2371/00: Characterised by the use of polyethers obtained by reactions forming an ether link in the main chain; Derivatives of such polymers
- C08K 3/08: Metals
- C08K 3/16: Halogen-containing compounds
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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)
- A23B: PRESERVATION OF FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES; CHEMICAL RIPENING OF FRUIT OR VEGETABLES
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

A multilayer nonporous oxygen absorbing structure that resists delamination, e.g., humidity induced delamination, including a first layer having a first continuous polymer phase, a first water insoluble, dispersed, polyether resin phase in the first continuous polymer phase, and a water activated oxygen absorber, and a second layer having a second continuous polymer phase, bonded to the first layer.

## Claims

### Claim 1

A multilayer nonporous oxygen absorbing structure comprising:
a first layer comprising a first continuous polymer phase, a first water insoluble, dispersed, polyether resin phase in the first continuous polymer phase, and a water activated oxygen absorber; and,
a second layer comprising a second continuous polymer phase, bonded to the first layer,
wherein, the first continuous polymer phase and the first water insoluble, dispersed, polyether resin phase form an immiscible polymer blend,
wherein, an amount of the first water insoluble, dispersed, polyether resin phase and an amount of the first continuous polymer phase is determined by a viscosity ratio of the first water insoluble, dispersed, polyether resin phase and the first continuous polymer phase according to the equation:
ϕ
1
>
ϕ
2
(
η
1
η
2
)
,
where ϕ1 and ϕ2 are the volume fractions of the first continuous polymer phase and the first water insoluble, dispersed polyether resin phase, respectively, and η1 and η2 are melt viscosities of the first continuous polymer phase and the first water insoluble, dispersed, polyether resin phase at the same shear rate and temperature, respectively, and
wherein, the first layer has a water vapor permeability greater than or equal to 0.040
(
g
·
mm
m
2
·
24
⁢
hrs
)
at 5° C. and 90% relative humidity and less than 0.682
(
g
·
mm
m
2
·
24
⁢
hrs
)
at 23° C. and 90% relative humidity.

### Claim 2 (depends on 1)

The multilayer nonporous oxygen absorbing structure of claim 1 further comprising:
a third layer comprising a third continuous polymer phase and a second water insoluble, dispersed, polyether resin phase in the third continuous polymer phase, bonded to the first layer opposite the second layer.

### Claim 3 (depends on 2)

The multilayer nonporous oxygen absorbing structure of claim 2 wherein the third continuous polymer phase is selected from the group of: ethylene methyl acrylate (EMA); ethylene-vinyl acetate (EVA); ethylene ethyl acrylate (EEA); polyethylene; polypropylene; and, maleic anhydride grafted polyolefin.

### Claim 4 (depends on 2)

The multilayer nonporous oxygen absorbing structure of claim 2 wherein the second water insoluble, dispersed, polyether resin phase is selected from the group of: polyether-block-polyamide; polyether-block-polyester; thermoplastic urethane containing polyether.

### Claim 5 (depends on 2)

The multilayer nonporous oxygen absorbing structure of claim 2 wherein at least one of: the first continuous polymer phase; the first water insoluble, dispersed, polyether resin phase; the second continuous polymer phase; the third continuous polymer phase; and, the second water insoluble, dispersed, polyether resin phase, is melt processable.

### Claim 6 (depends on 1)

The multilayer nonporous oxygen absorbing structure of claim 1 wherein the second layer is bonded to the first layer by a chemical bond.

### Claim 7 (depends on 1)

The multilayer nonporous oxygen absorbing structure of claim 1 wherein the second layer is bonded to the first layer by melt bonding of the second layer with the first layer.

### Claim 8 (depends on 1)

The multilayer nonporous oxygen absorbing structure of claim 1 wherein the second layer is bonded to the first layer by a mechanical bond.

### Claim 9 (depends on 1)

The multilayer nonporous oxygen absorbing structure of claim 1 wherein the first continuous polymer phase is selected from the group of: ethylene methyl acrylate (EMA); ethylene-vinyl acetate (EVA); ethylene ethyl acrylate (EEA); polyethylene; polypropylene; polyamides; and, maleic anhydride grafted polyolefin.

### Claim 10 (depends on 1)

The multilayer nonporous oxygen absorbing structure of claim 1 wherein the first water insoluble, dispersed, polyether resin phase is selected from the group of: polyether-block-polyamide; polyether-block-polyester; thermoplastic urethane containing polyether.

### Claim 11 (depends on 1)

The multilayer nonporous oxygen absorbing structure of claim 1 wherein the second continuous polymer phase is selected from the group of: ethylene methyl acrylate (EMA); ethylene-vinyl acetate (EVA); ethylene ethyl acrylate (EEA); polyethylene; polypropylene; polyamides; and, maleic anhydride grafted polyolefin.

### Claim 12 (depends on 1)

The multilayer nonporous oxygen absorbing structure of claim 1 wherein the water activated oxygen absorber is a transition metal in combination with a metal halide, a transition metal in combination with an electrolyte, or combinations thereof.

### Claim 13 (depends on 1)

The multilayer nonporous oxygen absorbing structure of claim 1 wherein at least one of: the first continuous polymer phase; the first water insoluble, dispersed, polyether resin phase; and, the second continuous polymer phase, is melt processable.

### Claim 14 (depends on 1)

The multilayer nonporous oxygen absorbing structure of claim 1 wherein the first layer further comprises a plasticizer selected from the group of: dibutyl sebacate; triacetin; triethyl citrate; and, combinations thereof.

### Claim 15 (depends on 1)

The multilayer nonporous oxygen absorbing structure of claim 1 wherein the combination of the first layer and the second layer form a polymer film or a polymer sheet.

### Claim 16 (depends on 1)

The multilayer nonporous oxygen absorbing structure of claim 1, wherein, the first continuous polymer phase comprises a resin including one or more of a compatibilizer, a plasticizer, an oxygen absorber dispersant, and silica gel.

### Claim 17 (depends on 1)

The multilayer nonporous oxygen absorbing structure of claim 1, wherein the first layer comprises 12.6-42.3 wt % of first water insoluble, dispersed, polyether resin phase, 14.74-15.0 wt % of water activated oxygen absorber, 0.66-1.0 wt % of dispersant, and 42.3-71.4 wt % of first continuous polymer phase.