Multi-layer sandwich sheet and packaging using the said sheet

Claim 2

A multilayer sandwich sheeting comprising at least two separately and simultaneously extruded layers of polymeric materials, a first layer being composed of a first polymeric material selected from a group consisting of a polyolefin resin and a copolymer of polyamide and polyether, said first polymeric material being mixed before extruding with a volatile active agent selected from the group consisting of a perfuming composition, a deodorizing composition, a flavoring agent, an aroma agent, an insecticidal substance and a bactericidal substance; and a second layer being composed of a second polymeric material which is impervious to said volatile active agent, said second layer being extruded as the outer layer while the first layer forms the inner layer, such that evaporation of said volatile active agent is substantially prevented during said extrusion; said first and second layers being permanently stuck together.

Claim 3

Packaging formed from a multilayer sandwich sheeting comprising at least two separately and simultaneously extruded layers of polymeric materials, a first layer being composed of a first polymeric material selected from a group consisting of a polyolefin resin and a copolymer of polyamide and polyether, said first polymeric material being mixed before extruding with a volatile active agent selected from the group consisting of a perfuming composition, a deodorizing composition, a flavoring agent, an aroma agent, an insecticidal substance and a bactericidal substance; and a second layer being composed of a second polymeric material which is impervious to said volatile active agent, said second layer being extruded as the outer layer while the first layer forms the inner layer, such that evaporation of said volatile active agent is substantially prevented during said extrusion; said first and second layers being permanently stuck together.

Claim 4

Packaging formed from a multilayer sandwich sheeting comprising at least two separately and simultaneously extruded layers of polymeric materials, a first layer being composed of a first polymeric material selected from a group consisting of a polyolefin resin and a copolymer of polyamide and polyether, said first polymeric material being mixed before extruding with a volatile active agent selected from the group consisting of a perfuming composition, a deodorizing composition, a flavoring agent, an aroma agent, an insecticidal substance and a bactericidal substance; and a second layer being composed of a second polymeric material which is impervious to said volatile active agent, said second layer being extruded as the outer layer while the first layer forms the inner layer, such that evaporation of said volatile active agent is substantially prevented during said extrusion; said first and second layers being permanently stuck together.

Claim 5

Packaging formed from the sandwich sheet of claim 2, wherein the second layer forms the outside of the package.

Claim 6

A multilayer sandwich sheeting which is prepared by separately and simultaneously co-extruding in a current of air or inert gas at least two layers which are superimposed and permanently bound together, one of said layers being composed of a material impervious to a volatile active agent and the other said layer being composed of a film made from a polymeric material, said film being 10 to 300 microns thick and containing said active agent premixed in a homogenous manner in said polymeric material prior to extrusion in a proportion of 0.1 to 50% active agent by weight to the weight of said polymeric material in which said active agent is incorporated, the said impervious layer being extruded as the outer layer while the said active agent containing layer forms the inner layer such that evaporation of said active agent is prevented during simultaneous co-extrusion of said layers.

Claim 7

A multilayer sandwich sheeting which is prepared by separately and simultaneously co-extruding in a current of air or inert gas at least two layers which are superimposed and permanently bound together, one of said layers being composed of a material impervious to a volatile active agent and the other said layer being composed of a film made from a polymeric material, said film being 10 to 300 microns thick and containing said active agent premixed in a homogenous manner in said polymeric material prior to extrusion in a proportion of 0.1 to 50% active agent by weight to the weight of said polymeric material in which said active agent is incorporated, the said impervious layer being extruded as the outer layer while the said active agent containing layer forms the inner layer such that evaporation of said active agent is prevented during simultaneous co-extrusion of said layers.

Claim 8

The sandwich sheet according to claim 4, wherein the film comprises a polyolefin resin.

Claim 9

The sandwich sheet according to claim 5, wherein the polyolefin resin comprises polyethylene, polypropylene, or copolymers of ethylene and propylene, ethylene and vinyl acetate, or ethylene and ethyl acrylate.

Claim 10

The sandwich sheet according to claim 4, wherein the film comprises a copolymer of polyamide and polyether.

Claim 11

The sandwich sheet according to claim 4, wherein the layer impervious to the volatile active agents comprises one of aluminum or a polyamide or polyester resin.

Claim 12

The sandwich sheet according to claim 4, wherein the two layers are superimposed and permanently bound together by gluing with an adhesive substance.

Claim 13

The sandwich sheet according to claim 9, wherein the adhesive substance is premixed with one of a perfuming composition, a deodorizing composition, an aroma agent, an insecticidal substance, or a bactericidal substance.

Claim 14

A multilayer sandwich sheeting which is prepared by separately and simultaneously co-extruding in a current of air or inert gas at least two layers which are superimposed and permanently bound together, one of said layers being composed of a material impervious to a volatile active agent and the other said layer being composed of a film made from a polymeric material, said film being 10 to 300 microns thick and containing said active agent premixed in a homogeneous manner in said polymeric material prior to extrusion in a proportion of 0.1 to 50% active agent by weight to the weight of said polymeric material in which said active agent is incorporated, said volatile active agent being selected from the group consisting of a perfuming composition, a deodorizing composition, a flavoring agent, an aroma agent, an insecticidal substance and a bactericidal substance, the said impervious layer being extruded as the outer layer while the said active agent containing layer forms the inner layer such that evaporation of said active agent is prevented during simultaneous co-extrusion of said layers.

Claim 15

A multilayer sandwich sheeting which is prepared by separately and simultaneously co-extruding in a current of air or inert gas at least two layers which are superimposed and permanently bound together, one of said layers being composed of a material impervious to a volatile active agent and the other said layer being composed of a film made from a polymeric material, said film being 10 to 300 microns thick and containing said active agent premixed in a homogeneous manner in said polymeric material prior to extrusion in a proportion of 0.1 to 50% active agent by weight to the weight of said polymeric material in which said active agent is incorporated, said volatile active agent being selected from the group consisting of a perfuming composition, a deodorizing composition, a flavoring agent, an aroma agent, an insecticidal substance and a bactericidal substance, the said impervious layer being extruded as the outer layer while the said active agent containing layer forms the inner layer such that evaporation of said active agent is prevented during simultaneous co-extrusion of said layers.

Claim 16

Packaging formed from a multilayer sandwich sheeting which is prepared by separately and simultaneously co-extruding in a current of air or inert gas at least two layers which are superimposed and permanently bound together, one of said layers consisting of a material impervious to a volatile active agent and the other said layer being composed of a film made from a polymeric material, said film being 10 to 300 microns thick and containing said active agent premixed in a homogenous manner in said polymeric material prior to extrusion in a proportion of 0.1 to 50% active agent by weight to the weight of said polymeric material in which said active agent is incorporated, the said impervious layer being extruded as the exterior layer while the said active agent containing layer forms the interior layer such that evaporation of said active agent is prevented during simultaneous co-extrusion of said layers.

Claim 17

Packaging formed from a multilayer sandwich sheeting which is prepared by separately and simultaneously co-extruding in a current of air or inert gas at least two layers which are superimposed and permanently bound together, one of said layers consisting of a material impervious to a volatile active agent and the other said layer being composed of a film made from a polymeric material, said film being 10 to 300 microns thick and containing said active agent premixed in a homogenous manner in said polymeric material prior to extrusion in a proportion of 0.1 to 50% active agent by weight to the weight of said polymeric material in which said active agent is incorporated, the said impervious layer being extruded as the exterior layer while the said active agent containing layer forms the interior layer such that evaporation of said active agent is prevented during simultaneous co-extrusion of said layers.

Claim 18

The packaging according to claim 12, wherein the film comprises a polyolefin resin.

Claim 19

The packaging according to claim 13, wherein the polyolefin resin comprises polyethylene, polypropylene, or copolymers of ethylene and propylene, ethylene and vinyl acetate, or ethylene and ethyl acrylate.

Claim 20

The packaging according to claim 12, wherein the film comprises a copolymer of polyamide and polyether.

Claim 21

The packaging according to claim 12, wherein the layer impervious to the volatile active agents comprises aluminum or a polyamide or polyester resin.

Claim 22

The packaging according to claim 12, wherein the two layers are superimposed and permanently bound together by gluing with an adhesive substance.

Claim 23

The packaging according to claim 17, wherein the adhesive substance is premixed with one of a perfuming composition, a deodorizing composition, an aroma agent, an insecticidal substance, or a bactericidal substance.

Claim 24

Packaging formed from a multilayer sandwich sheeting which is prepared by separately and simultaneously coextruding in a current of air or inert gas at least two layers which are superimposed and permanently bound together, one of said layers consisting of a material impervious to a volatile active agent and the other said layer being composed of a film made from a polymeric material, said film being 10 to 300 microns thick and containing said active agent premixed in a homogeneous manner in said polymeric material prior to extrusion in a proportion of 0.1 to 50% active agent by weight to the weight of said polymeric material in which said active agent is incorporated, said volatile active agent being selected from the group consisting of a perfuming composition, a deodorizing composition, a flavoring agent, an aroma agent, an insecticidal substance, and a bactericidal substance, the said impervious layer being extruded as the exterior layer while the said active agent containing layer forms the interior layer such that the evaporation of said active agent is prevented during simultaneous co-extrusion of said layers.

Claim 25

Packaging formed from a multilayer sandwich sheeting which is prepared by separately and simultaneously coextruding in a current of air or inert gas at least two layers which are superimposed and permanently bound together, one of said layers consisting of a material impervious to a volatile active agent and the other said layer being composed of a film made from a polymeric material, said film being 10 to 300 microns thick and containing said active agent premixed in a homogeneous manner in said polymeric material prior to extrusion in a proportion of 0.1 to 50% active agent by weight to the weight of said polymeric material in which said active agent is incorporated, said volatile active agent being selected from the group consisting of a perfuming composition, a deodorizing composition, a flavoring agent, an aroma agent, an insecticidal substance, and a bactericidal substance, the said impervious layer being extruded as the exterior layer while the said active agent containing layer forms the interior layer such that the evaporation of said active agent is prevented during simultaneous co-extrusion of said layers.

Claim 26

A multilayer sandwich sheeting which is prepared by separately and simultaneously co-extruding in a current of air or inert gas at least two layers which are superimposed and permanently bound together, one of said layers being composed of a material impervious to a volatile active agent and the other said layer being composed of a film made from a polymeric material, said film being 10 to 300 microns thick and containing said active agent premixed in a homogeneous manner in said polymeric material prior to extrusion in a proportion of 0.1 to 50% active agent by weight to the weight of said polymeric material in which said active agent is incorporated, said volatile active agent being selected from among compounds having sanitizing or aromatizing characteristics, the said impervious layer being extruded as the outer layer while the said active agent containing layer forms the inner layer such that evaporation of said active agent is prevented during simultaneous co-extrusion of said layers.

Claim 27

A multilayer sandwich sheeting which is prepared by separately and simultaneously co-extruding in a current of air or inert gas at least two layers which are superimposed and permanently bound together, one of said layers being composed of a material impervious to a volatile active agent and the other said layer being composed of a film made from a polymeric material, said film being 10 to 300 microns thick and containing said active agent premixed in a homogeneous manner in said polymeric material prior to extrusion in a proportion of 0.1 to 50% active agent by weight to the weight of said polymeric material in which said active agent is incorporated, said volatile active agent being selected from among compounds having sanitizing or aromatizing characteristics, the said impervious layer being extruded as the outer layer while the said active agent containing layer forms the inner layer such that evaporation of said active agent is prevented during simultaneous co-extrusion of said layers.