Patent EP0305959A2 successfully refreshed from Google Patents.
EP0305959A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Multilayer film containing amorphous nylon
Assignee: Viskase Corp
•
Filing: 1988-08-30
•
Granted: —
•
Expires: 2008-08-30
Abstract
Abstract An oriented multilayer film comprising a barrier layer, a first layer on one side of said barrier layer and a second layer on the opposite side of said barrier layer is provided for use in food packaging applications. The first and second layers have melting points of at least about 115°C. The barrier layer comprises amorphous nylon having a glass transition temperature greater than the higher of the two melting points or higher than the melting point of the first and second layers. The barrier layer is substantially impermeable to oxygen, while the first and second layers may comprise certain polyethylene resins. The oxygen barrier properties of the film do not deteriorate as the barrier layer gradually absorbs moisture. A process for making such multilayer films is also provided.
Inventors
- 👤 Stanley Lustig
- 👤 Stephen James Vicik
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 23:39
CPC Classifications
B; B32; B32B; B32B7/00; B32B7/02; B32B7/027; B32B1/00; B32B1/08; B32B27/00; B32B27/06; B32B27/08; B32B27/32; B32B27/34; B32B38/00; B32B38/0012; B32B2038/0028; B32B2307/00; B32B2307/50; B32B2307/514; B32B2310/00; B32B2310/04; B32B2310/0445; B32B2323/00; B32B2323/04; B32B2323/046; B32B2377/00; B32B2439/00; B32B2439/70; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/139; Y10T428/1393; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/31504; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/31746
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
81 words
An oriented multilayer film comprising a barrier layer, a first layer on one side of said barrier layer and a second layer on the opposite side of said barrier layer, wherein said first layer and said second layer have melting points of at least about 115°C and said barrier layer comprises amorphous nylon having a glass transition temperature greater than the higher of the two melting points or higher than the melting point of said first layer and said second layer.
Claim 2
Dependent Claim
81 words
An oriented multilayer film comprising a barrier layer, a first layer on one side of said barrier layer and a second layer on the opposite side of said barrier layer, wherein said first layer and said second layer have melting points of at least about 115°C and said barrier layer comprises amorphous nylon having a glass transition temperature greater than the higher of the two melting points or higher than the melting point of said first layer and said second layer.
Claim 3
Dependent Claim
21 words
The oriented multilayer film of claim 1 wherein said barrier layer comprises Selar Polyamide 3426 Barrier Resin manufactured by Du Pont.
Claim 4
Dependent Claim
16 words
The oriented multilayer film of claim 1 wherein said first layer comprises linear low density polyethylene.
Claim 5
Dependent Claim
16 words
The oriented multilayer film of claim 1 wherein said second layer comprises linear low density polyethylene.
Claim 6
Dependent Claim
16 words
The oriented multilayer film of claim 1 wherein said first layer comprises very low density polyethylene.
Claim 7
Dependent Claim
16 words
The oriented multilayer film of claim 1 wherein said second layer comprises very low density polyethylene.
Claim 8
Dependent Claim
44 words
The oriented multilayer film of claim 1 wherein at least one of said first and second layers comprises linear low density polyethylene in an amount of at least 90 weight percent and ethylene vinyl acetate in an amount up to about 10 weight percent.
Claim 9
Dependent Claim
44 words
The oriented multilayer film of claim 1 wherein at least one of said first and second layers comprises very low density polyethylene in an amount of at least 90 weight percent and ethylene vinyl acetate in an amount up to about 10 weight percent.
Claim 10
Dependent Claim
18 words
The oriented multilayer film of claim 1 wherein at least one layer of said multilayer film is cross-linked.
Claim 11
Dependent Claim
22 words
The oriented multilayer film of claim 1 wherein the entire multilayer film is cross-linked with an irradiation dosage of approximately 1-10 Mrad.
Claim 12
Dependent Claim
60 words
An oriented multilayer film comprising a barrier layer, a first layer on one side of said barrier layer and a second layer on the opposite side of said barrier layer, wherein said first layer and said second layer have melting points of at least about 115°C and said barrier layer comprises Selar Polyamide 3426 Barrier Resin manufactured by Du Pont.
Claim 13
Dependent Claim
60 words
An oriented multilayer film comprising a barrier layer, a first layer on one side of said barrier layer and a second layer on the opposite side of said barrier layer, wherein said first layer and said second layer have melting points of at least about 115°C and said barrier layer comprises Selar Polyamide 3426 Barrier Resin manufactured by Du Pont.
Claim 14
Dependent Claim
16 words
The oriented multilayer film of claim 11 wherein said first layer comprises linear low density polyethylene.
Claim 15
Dependent Claim
16 words
The oriented multilayer film of claim 11 wherein said second layer comprises linear low density polyethylene.
Claim 16
Dependent Claim
16 words
The oriented multilayer film of claim 11 wherein said first layer comprises very low density polyethylene.
Claim 17
Dependent Claim
16 words
The oriented multilayer film of claim 11 wherein said second layer comprises very low density polyethylene.
Claim 18
Dependent Claim
44 words
The oriented multilayer film of claim 11 wherein at least one of said first and second layers comprises linear low density polyethylene in an amount of at least 90 weight percent and ethylene vinyl acetate in an amount up to about 10 weight percent.
Claim 19
Dependent Claim
44 words
The oriented multilayer film of claim 11 wherein at least one of said first and second layers comprises very low density polyethylene in an amount of at least 90 weight percent and ethylene vinyl acetate in an amount up to about 10 weight percent.
Claim 20
Dependent Claim
18 words
The oriented multilayer film of claim 11 wherein at least one layer of said multilayer film is cross-linked.
Claim 21
Dependent Claim
22 words
The oriented multilayer film of claim 11 wherein the entire multilayer film is cross-linked with an irradiation dosage of approximately 1-10 Mrad.
Claim 22
Dependent Claim
62 words
A coextruded biaxially oriented multilayer film comprising a barrier layer, a first layer on one side of said barrier layer and a second layer on the opposite side of said barrier layer, wherein said first layer and said second layer have melting points of at least about 115°C and said barrier layer comprises Selar Polyamide 3426 Barrier Resin manufactured by Du Pont.
Claim 23
Dependent Claim
62 words
A coextruded biaxially oriented multilayer film comprising a barrier layer, a first layer on one side of said barrier layer and a second layer on the opposite side of said barrier layer, wherein said first layer and said second layer have melting points of at least about 115°C and said barrier layer comprises Selar Polyamide 3426 Barrier Resin manufactured by Du Pont.
Claim 24
Dependent Claim
16 words
The biaxially oriented film of claim 20 wherein said first layer comprises linear low density polyethylene.
Claim 25
Dependent Claim
17 words
The biaxially oriented multilayer film of claim 20 wherein said second layer comprises linear low density polyethylene.
Claim 26
Dependent Claim
16 words
The biaxially oriented film of claim 20 wherein said first layer comprises very low density polyethylene.
Claim 27
Dependent Claim
16 words
The biaxially oriented film of claim 20 wherein said second layer comprises very low density polyethylene.
Claim 28
Dependent Claim
44 words
The oriented multilayer film of claim 20 wherein at least one of said first and second layers comprises linear low density polyethylene in an amount of at least 90 weight percent and ethylene vinyl acetate in an amount up to about 10 weight percent.
Claim 29
Dependent Claim
44 words
The oriented multilayer film of claim 20 wherein at least one of said first and second layers comprises very low density polyethylene in an amount of at least 90 weight percent and ethylene vinyl acetate in an amount up to about 10 weight percent.
Claim 30
Dependent Claim
18 words
The biaxially oriented film of claim 20 wherein at least one layer of said multilayer film is cross-linked.
Claim 31
Dependent Claim
22 words
The biaxially oriented film of claim 20 wherein the entire multilayer film is cross-linked with an irradiation dosage of approximately 1-10 Mrad.
Claim 32
Dependent Claim
96 words
A process for producing an oriented multilayer film comprising the steps of: a) coextruding a barrier layer, a first layer on one side of said barrier layer and a second layer on the opposite side of said barrier layer, wherein said first layer and said second layer have melting points of at least about 115°C and said barrier layer comprises amorphous nylon having a glass transition temperature greater than the higher of the two melting points or higher than the melting point of said first layer and said second layer; and b) stretching said multilayer film.
Claim 33
Dependent Claim
96 words
A process for producing an oriented multilayer film comprising the steps of: a) coextruding a barrier layer, a first layer on one side of said barrier layer and a second layer on the opposite side of said barrier layer, wherein said first layer and said second layer have melting points of at least about 115°C and said barrier layer comprises amorphous nylon having a glass transition temperature greater than the higher of the two melting points or higher than the melting point of said first layer and said second layer; and b) stretching said multilayer film.
Claim 34
Dependent Claim
17 words
The process of claim 29 wherein said multilayer film is produced by a double bubble coextrusion process.
Claim 35
Dependent Claim
11 words
The process of claim 29 wherein said multilayer film is cross-linked.
Claim 36
Dependent Claim
21 words
The process of claim 29 wherein said multilayer film is cross-linked by exposure to an irradiation dosage of approximately 1-10 Mrad.
Claim 37
Dependent Claim
19 words
The process of claim 29 wherein said barrier layer comprises Selar Polyamide 3426 Barrier Resin manufactured by Du Pont.
Claim 38
Dependent Claim
36 words
The process of claim 29 wherein at least one of said first and second layers comprises a polymer resin selected from the group consisting of linear low density polyethylene, very low density polyethylene, and combinations thereof.
Claim 39
Dependent Claim
12 words
The process of claim 29 wherein said multilayer film is biaxially stretched.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.