US 4,536,409 A · Oxygen scavenger

A polymeric laminate having only solid layers which comprises:

a. at least one polymeric protective layer in protective relation to an oxygen scavenger material in another layer of the laminate, and
b. a polymeric layer having incorporated therein a dry oxygen scavenger material, the material being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and triggerable to an active state when wetted with water which has selectively permeated the protective layer from outside the laminate, whereupon the oxygen scavenger will directly react with oxygen,
wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.

A polymeric laminate having only solid layers which comprises:

a. a polymeric oxygen barrier layer,
b. at least one polymeric protective layer in protective relation to an oxygen scavenger material in another layer of the laminate,
c. a polymeric layer between said oxygen barrier layer and said protective layer and having therein a dry oxygen scavenger material, the material being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated the protective layer from outside of the laminate, whereupon the oxygen scavenger will directly react with oxygen,
d. an outer polymeric protective layer adjacent the oxygen barrier layer on the side opposite to said scavenger layer
wherein said protective layers are substantially resistant to permeation by water at ambient temperature and have enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.

2 more elements

A polymeric laminate having only solid layers which comprises:

a. a polymeric oxygen barrier layer,
b. first and second polymeric layers,
c. at least one first and second polymeric protective layers in protective relationship to said first and second polymeric layers, said first polymeric layer being located between said oxygen barrier layer and said first protective layer and said second polymeric layer being between said oxygen barrier layer and said second protective layer, said first and second polymeric layers having therein a dry oxygen scavenger material, the material being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated a protective layer from outside of the laminate, whereupon the oxygen scavenger will directly react with oxygen,
wherein said protective layers are substantially resistant to permeation by water at ambient temperature and have enhanced transmission of water at elevated temperatures and therefore are selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.

1 more element

A multilayer polymeric container which includes a wall which is a laminate, the laminate having only solid layers which comprises:

a. a polymeric oxygen barrier layer,
b. at least one polymeric protective layer in protective relation to an oxygen scavenger material in another layer of the laminate,
c. a polymeric layer between said oxygen barrier layer and said protective layer and having therein a dry oxygen scavenger composition, the composition being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated the protective layer from outside of the laminate, whereupon the oxygen scavenger will directly react with oxygen,
d. an outer polymeric protective layer adjacent the oxygen barrier layer on the side opposite to said scavenger layer
wherein said protective layers are substantially resistant to permeation by water at ambient temperature and have enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger composition to convert it from the passive to the active state.

2 more elements

A multilayer polymeric container which comprises a wall which is a laminate, the laminate having only solid layers which comprises:

a. a polymeric oxygen barrier layer,
b. first and second polymeric layers,
c. at least one first and second polymeric protective layers in protective relationship to said first and second polymeric layers, said first polymeric layer being located between said oxygen barrier layer and said first protective layer and said second polymeric layer being located between said oxygen barrier layer and said second protective layer, said first and second polymeric layers having therein a dry oxygen scavenger material, the material being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated the protective layer from outside of the laminate, whereupon the oxygen scavenger will directly react with oxygen,
wherein said protective layers are substantially resistant to permeation by water at ambient temperature and have enhanced transmission of water at elevated temperatures and therefore are selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger composition to convert it from the passive to the active state.

1 more element

A method of producing a multilayer polymeric laminate which comprises forming a solid polymeric laminate, the laminate having only solid layers which comprises:

a. a polymeric oxygen barrier layer,
b. at least one polymeric protective layer in protective relation to an oxygen scavenger material in another layer of the laminate,
c. a polymeric layer between said oxygen barrier layer and said protective layer and having therein a dry oxygen scavenger material, the material being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated the protective layer from outside of the laminate, whereupon the oxygen scavenger will directly react with oxygen,
d. an outer polymeric protective layer adjacent the oxygen barrier layer on the side opposite to said scavenger layer wherein said protective layers are substantially resistant to permeation by water at ambient temperature and have enhanced transmission of water at elevated temperatures, and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.

1 more element

A method of producing a multilayer polymeric laminate which comprises forming a polymeric laminate, the laminate having only solid layers which comprises:

a. a polymeric oxygen barrier layer,
b. first and second polymeric layers,
c. at least one first and second polymeric protective layers in protective relationship to said first and second polymeric layers, said first polymeric layer being located between said oxygen barrier layer and said first protective layer, and said second polymeric layer being located between said oxygen barrier layer and said second polymeric protective layer, said first and second polymeric layers having therein a dry oxygen scavenger material, the material being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated the protective layer from outside of the laminate, whereupon the oxygen scavenger will directly react with oxygen,
wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.

1 more element

A method of producing a triggered solid polymeric multilayer food container having only solid layers which comprises:

a. mixing a polymeric material with a dry oxygen scavenger composition to form a thermoplastic mixture, said oxygen scavenger composition being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated a protective layer from outside of the laminate whereupon it will directly react with oxygen,
b. forming a multilayer polymeric laminate containing:
i. at least one polymeric protective layer in protective relation to an oxygen scavenger material in another layer of the laminate, and
ii. a polymeric layer of said thermoplastic mixture having incorporated therein said dry oxygen scavenger material, wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state,
c. forming the laminate into a container and maintaining the container in its dry state,
d. filling the container with a comestible containing water and
e. retorting the container thereby to activate the oxygen scavenger material into its active state.

4 more elements

A method of producing a triggered polymeric multilayer food container having only solid layers which comprises:

a. mixing a polymeric material with a dry oxygen scavenger composition to form a thermoplastic mixture, said oxygen scavenger composition being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated a protective layer from outside of the laminate whereupon it will directly react with oxygen,
b. forming a multilayer polymeric laminate containing:
a polymeric oxygen barrier layer, and, adhered thereto, at least one polymeric protective layer in protective relation to said dry oxygen scavenger composition incorporated in said polymeric protective layer,
wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state,
c. forming the laminate into a container and maintaining the container in its dry state,
d. filling the container with a comestible containing water, and
e. retorting the container therby to activate the oxygen scavenger material into its active state.

4 more elements

A method of producing a triggered polymeric multilayer food container having only solid layers which comprises:

a. mixing a polymeric material with a dry oxygen scavenger composition to form a thermoplastic mixture, said oxygen scavenger composition being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated a protective layer from outside of the laminate whereupon it will directly react with oxygen,
b. forming a multilayer polymeric laminate containing:
i. a polymeric oxygen barrier layer,
ii. at least one polymeric protective layer in protective relation to an oxygen scavenger material incorporated in another layer of the laminate,
iii. a polymeric layer of said thermoplastic mixture between said oxygen barrier layer and said protective layer and having therein said dry oxygen scavenger material,
wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state,
c. forming the laminate into a container and maintaining the container in its dry state,
d. filling the container with a comestible containing water and
e. retorting the container thereby to activate the oxygen scavenger material into its active state.

6 more elements

A method of producing a triggered polymeric multilayer food container having only solid layers which comprises:

a. mixing a polymeric material with a dry oxygen scavenger composition to form a thermoplastic mixture, said oxygen scavenger composition being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated a protective layer from outside of the laminate whereupon it will directly react with oxygen,
b. forming a multilayer polymeric laminate containing:
i. a polymeric oxygen barrier layer,
ii. at least one polymeric protective layer in protective relation to an oxygen scavenger material in another layer of the laminate,
iii. a polymeric layer of said thermoplastic mixture between said oxygen barrier layer and said protective layer and having therein said dry oxygen scavenger material,
iv. an outer polymeric protective layer adjacent the oxygen barrier layer on the side opposite to said scavenger layer wherein said protective layers are substantially resistant to permeation by water at ambient temperature and have enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state,
c. forming the laminate into a container and maintaining the container in its dry state,
d. filling the container with a comestible containing water and
e. retorting the container thereby to activate the oxygen scavenger material into its active state.

6 more elements

A method of producing a triggered polymeric multilayer food container having only solid layers which comprises:

a. mixing a polymeric material with a dry oxygen scavenger composition to form a thermoplastic mixture, said oxygen scavenger composition being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated a protective layer from outside of the laminate whereupon it will directly react with oxygen,
b. forming a multilayer polymeric laminate containing:
i. a polymeric oxygen barrier layer,
ii. first and second polymeric layers,
iii. at least one first and second polymeric protective layers in protective relationship to said first and second polymeric layers, a first polymeric layer of said thermoplastic mixture being located between said oxygen barrier layer and said first protective layer, and a second polymeric layer of said thermoplastic mixture being located between said oxygen barrier layer said second polymeric protective layer, said first and second polymeric layers having therein said dry oxygen scavenger material,
wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state,
c. forming the laminate into a container and maintaining the container in its dry state,
d. filling the container with a comestible containing water and
e. retorting the container thereby to activate the oxygen scavenger material into its active state.

6 more elements

Oxygen scavenger

Life of this patent

Abstract

Claims125

Oxygen scavenger

Life of this patent

Abstract

Claims125