US4464443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drying agent in multi-layer polymeric structure
Assignee: Pechiney Plastic Packaging Inc
•
Filing: 1983-10-03
•
Granted: 1984-08-07
•
Expires: 2003-10-03
Abstract
Abstract In a multi-layer polymeric structure having an interior oxygen barrier layer of a moisture sensitive polymeric material such as ethylene-vinyl alcohol, drying agents are incorporated in the structure, particularly in a layer or layers proximate to the barrier layer, to limit the moisture content of the barrier layer to maintain barrier properties.
Inventors
- 👤 Christopher J. Farrell
- 👤 Boh C. Tsai
- 👤 James A. Wachtel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:49
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/18; B32B27/32; B32B7/00; B32B7/04; B32B7/12; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/1341; Y10T428/1352; Y10T428/1379; Y10T428/1383; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
39 words
In a multi-layer polymer structure having a layer of a moisture-sensitive oxygen barrier polymer and exterior layers of structural polymer, the improvement which comprises the incorporation of an ammonium chloride drying agent entrapped in the moisture-sensitive oxygen barrier layer.
Claim 2
Dependent Claim
39 words
In a multi-layer polymer structure having a layer of a moisture-sensitive oxygen barrier polymer and exterior layers of structural polymer, the improvement which comprises the incorporation of an ammonium chloride drying agent entrapped in the moisture-sensitive oxygen barrier layer.
Claim 3
Dependent Claim
50 words
In a multi-layer polymer structure having a layer of a moisture-sensitive oxygen barrier polymer, and exterior layers of structural polymer, the improvement which comprises the incorporation of a drying agent which liberates acid when heated to an elevated temperature, and a proton-acceptor substance entrapped in the moisture-sensitive oxygen barrier layer.
Claim 4
Dependent Claim
50 words
In a multi-layer polymer structure having a layer of a moisture-sensitive oxygen barrier polymer, and exterior layers of structural polymer, the improvement which comprises the incorporation of a drying agent which liberates acid when heated to an elevated temperature, and a proton-acceptor substance entrapped in the moisture-sensitive oxygen barrier layer.
Claim 5
Dependent Claim
13 words
The multi-layer structure of claim 2 wherein the drying agent is ammonium chloride.
Claim 6
Dependent Claim
12 words
The multi-layer structure of claim 3 wherein the proton-acceptor is calcium oxide.
Claim 7
Dependent Claim
22 words
The multi-layer structure of claim 2 or 4 wherein the moisture-sensitive oxygen barrier polymer layer is an interior layer of the structure.
Claim 8
Dependent Claim
43 words
In a multi-layer polymer structure having a layer of moisture-sensitive oxygen barrier polymer, and exterior layers of a structural polymer, the improvement which comprises the incorporation of an ammonium chloride drying agent and a proton-acceptor substance entrapped in the moisture-sensitive oxygen barrier polymer.
Claim 9
Dependent Claim
43 words
In a multi-layer polymer structure having a layer of moisture-sensitive oxygen barrier polymer, and exterior layers of a structural polymer, the improvement which comprises the incorporation of an ammonium chloride drying agent and a proton-acceptor substance entrapped in the moisture-sensitive oxygen barrier polymer.
Claim 10
Dependent Claim
13 words
The multi-layer structure of claim 6 wherein the proton-acceptor substance is calcium oxide.
References Cited (Backward Citations)
US2772172A
Cited
US3524795A
Cited
US3560325A
Cited
GB1199843A
Cited
US3908070A
Cited
GB1384791A
Cited
US3882259A
Cited
US4041209A
Cited
US4064296A
Cited
US4239826A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-07 | 1988-02-06 | 1988-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-07 | 1992-02-06 | 1992-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-07 | 1996-02-06 | 1996-08-07 | $7700.00 | Window Closed / Lapsed |