Patent US3908070A successfully refreshed from Google Patents.
US3908070A
Expired / Lapsed
US
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Multilayer thermoplastic barrier structure
Assignee: Dow Chemical Co
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Filing: 1972-04-24
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Granted: 1975-09-23
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Expires: 1992-04-24
Abstract
Abstract A multilayered thermoplastic structure with excellent gas and water vapor barrier characteristics having an inner-barrier layer which is adhesively bonded to a polyolefin resin layer on one side and to a nylon resin layer on the other side. The multilayered thermoplastic structure can be easily formed by coextrusion.
Inventors
- 👤 Richard T Marzolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:51
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/32; B32B27/34; B32B7/00; B32B7/04; B32B7/12; B32B2250/00; B32B2250/24; B32B2307/00; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2307/7246; B32B2323/00; B32B2323/04; B32B2323/043; B32B2323/046; B32B2377/00; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928; Y10T428/31938
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
158 words
A THERMOPLASTIC MULTILAYERED STRUCTURE USEFUL AS A PACKAGING MATERIAL COMPRISING A GAS AND WATER VAPOR BARRIER CORE LAYER, JUXTAPOSED THERMOPLASTIC ADHESIVE LAYERS ON EACH SIDE OF SAID BARRIER LAYER, AN OUTER POLYOLEFIN RESIN LAYER SECURED T O ONE OF SAID ADHESIVE LAYERS AND AN OUTER NYLON LAYER SECURED TO ANOTHER OF SAID ADHESIVE LAYERS, SAID BARRIER COMPRISING A CONTINUOUS COHERENT LAYER OF A COPOLYMER OF VINYLIDENE CHLORIDE AND ONE OR MORE OLEFINICALLY UNSATURATED MONOMERS COPOLYMERIZED THEREWITH, SAID ADHESIVE LAYER COMPRISING A BLEND, ONE OF SAID BLEND COMPONENTS COMPRISING A COPOLYMER OF ETHYLENE AND MONOCARBOXYLIC ACID AND ANOTHER OF SAID BLEND COMPONENTS SELECTED FROM A GROUP CONSISTING OF A COPOLYMER OR ETHYLENE AND VINYL ACETATE, A COPOLYMER OF ETHYLENE AND ETHYL ACRYLATE, A COPOLYMER OF ETHYLENE AND ISOBUTYL ACRYLATE AND CHLORINATED POLYMERS OF ETHYLENE CONTAINING ABOUT 15 TO 40 WEIGHT PERCENT CHLORINE, SAID BLEND HAVING A RANGE OF ABOUT 25 TO ABOUT 75 WEIGHT PERCENT OF SAID BLEND COMPONENTS.
Claim 2
Dependent Claim
158 words
A THERMOPLASTIC MULTILAYERED STRUCTURE USEFUL AS A PACKAGING MATERIAL COMPRISING A GAS AND WATER VAPOR BARRIER CORE LAYER, JUXTAPOSED THERMOPLASTIC ADHESIVE LAYERS ON EACH SIDE OF SAID BARRIER LAYER, AN OUTER POLYOLEFIN RESIN LAYER SECURED T O ONE OF SAID ADHESIVE LAYERS AND AN OUTER NYLON LAYER SECURED TO ANOTHER OF SAID ADHESIVE LAYERS, SAID BARRIER COMPRISING A CONTINUOUS COHERENT LAYER OF A COPOLYMER OF VINYLIDENE CHLORIDE AND ONE OR MORE OLEFINICALLY UNSATURATED MONOMERS COPOLYMERIZED THEREWITH, SAID ADHESIVE LAYER COMPRISING A BLEND, ONE OF SAID BLEND COMPONENTS COMPRISING A COPOLYMER OF ETHYLENE AND MONOCARBOXYLIC ACID AND ANOTHER OF SAID BLEND COMPONENTS SELECTED FROM A GROUP CONSISTING OF A COPOLYMER OR ETHYLENE AND VINYL ACETATE, A COPOLYMER OF ETHYLENE AND ETHYL ACRYLATE, A COPOLYMER OF ETHYLENE AND ISOBUTYL ACRYLATE AND CHLORINATED POLYMERS OF ETHYLENE CONTAINING ABOUT 15 TO 40 WEIGHT PERCENT CHLORINE, SAID BLEND HAVING A RANGE OF ABOUT 25 TO ABOUT 75 WEIGHT PERCENT OF SAID BLEND COMPONENTS.
Claim 3
Dependent Claim
16 words
The multilayered structure of claim 1 wherein said outer polyolefin resin layer is a polyethylene layer.
Claim 4
Dependent Claim
34 words
The multilayered structure of claim 2 wherein said polyethylene layer is composed of a low density polyethylene having a density of less than about 0.94 and a thickness of about 5 mils or less.
Claim 5
Dependent Claim
34 words
The multilayered structure of claim 2 wherein said polyethylene layer is composed of a high density polyethylene having a density of about 0.94 or greater and a thickness of about 5 mils or greater.
Claim 6
Dependent Claim
82 words
The multilayered structure of claim 1 wherein said structure has a total thickness of from about 0.4 to about 300 mils, said outer polyolefin layer has a thickness of from about 0.1 to about 200 mils, said outer nylon layer has a thickness of from about 0.1 to about 50 mils, said barrier layer has a thickness of from about 0.1 to about 40 mils and each of said adhesive layers has a thickness of from about 0.1 to about 5 mils.
Claim 7
Dependent Claim
27 words
The multilayered structure of claim 1 wherein said adhesive layers comprise a blend or mixture of a copolymer of ethylene/vinyl acetate and a copolymer of ethylene/acrylic acid.
Claim 8
Dependent Claim
24 words
The multilayered structure of claim 6 wherein said blend or mixture is about 50/50 weight percent of ethylene/vinyl acetate copolymer and ethylene/acrylic acid copolymer.
References Cited (Backward Citations)
US3297518A
Cited
US3370972A
Cited
US3475267A
Cited
US3423231A
Cited
US3570748A
Cited
US3514367A
Cited
US3579416A
Cited
US3607519A
Cited
US3485783A
Cited
US3560227A
Cited
US3630826A
Cited
US3600468A
Cited
US3549389A
Cited
US3661677A
Cited
US3673050A
Cited
US3704157A
Cited
US3697368A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |