Patent US4792484A successfully refreshed from Google Patents.
US4792484A
Expired / Lapsed
US
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Composition, process for producing the same and multi-layer structure
Assignee: Kuraray Co Ltd
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Filing: 1987-05-13
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Granted: 1988-12-20
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Expires: 2007-05-13
Abstract
Abstract A composition comprising a matrix of an ethylene-vinyl alcohol copolymer having dispersed therein a granular drying agent in a particulate state, wherein the volume-area average diameter of the grains of drying agent having a long dia meter of not less than 10 mu is not greater than 30 mu . A multi-layer structure comprising layers of such a composition. The gas barrier property of the multi-layer structure is not substantially reduced after a retort treatment and thus, the multi-layer structure is extremely useful for packaging of food, especially packaging of retorted food.
Inventors
- 👤 Tohei Moritani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:25
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/18; B29; B29B; B29B9/00; B29B9/12; B32B27/06; B32B27/08; B32B27/30; B32B27/306; C; C08; C08K; C08K3/00; C08K3/01; C08K3/32; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L29/00; C08L29/02; C08L29/04; B29B2009/125; B29B9/02; B29B9/06; B32B2439/00; B32B2439/70; C08K2201/00; C08K2201/008; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
64 words
A composition comprising a matrix of an ethylene-vinyl alcohol (EVOH) copolymer having dispersed therein a granular drying agent in a particulate state, wherein among the dispersed grains of drying agent, the volume-area average diameter of the grains having a long diameter of at least 10μ is not greater than 30μ and the ratio of EVOH to said drying agent ranges from 97:3 to 50:50.
Claim 2
Dependent Claim
64 words
A composition comprising a matrix of an ethylene-vinyl alcohol (EVOH) copolymer having dispersed therein a granular drying agent in a particulate state, wherein among the dispersed grains of drying agent, the volume-area average diameter of the grains having a long diameter of at least 10μ is not greater than 30μ and the ratio of EVOH to said drying agent ranges from 97:3 to 50:50.
Claim 3
Dependent Claim
42 words
A composition as claimed in claim 1 wherein said ethylene-vinyl alcohol copolymer is a saponified ethylene-vinyl acetate copolymer having an ethylene unit content of 25 to 60 mol % and a saponification degree in the vinyl acetate component of at least 96%.
Claim 4
Dependent Claim
19 words
A composition as claimed in claim 1 wherein said drying agent is a salt capable of forming a hydrate.
Claim 5
Dependent Claim
41 words
A composition as claimed in claim 1 wherein said drying agent comprises as a main ingredient(s) at least one selected from monosodium phosphate, disodium phosphate, trisodium phosphate, trilithium phosphate and sodium pyrophosphate or a mixture of at least two of them.
Claim 6
Dependent Claim
71 words
A multi-layer structure comprising a layer of a composition comprising a matrix of an ethylene-vinyl alcohol (EVOH) copolymer having dispersed therein a granular drying agent in a particulate state, wherein among the dispersed grains of drying agent the volume-area average diameter of the grains having a long diameter of at least 10μ is not greater than 30μ ratio of said drying agent used in said composition is 3 to 50 wt%.
Claim 7
Dependent Claim
71 words
A multi-layer structure comprising a layer of a composition comprising a matrix of an ethylene-vinyl alcohol (EVOH) copolymer having dispersed therein a granular drying agent in a particulate state, wherein among the dispersed grains of drying agent the volume-area average diameter of the grains having a long diameter of at least 10μ is not greater than 30μ ratio of said drying agent used in said composition is 3 to 50 wt%.
Claim 8
Dependent Claim
43 words
A multi-layer structure as claimed in claim 5 wherein said ethylene-vinyl alcohol copolymer is a saponified ethylene-vinyl acetate copolymer having an ethylene unit content of 25 to 60 mol % and a saponification degree in the vinyl acetate component of at least 96%.
Claim 9
Dependent Claim
20 words
A multi-layer structure as claimed in claim 5 wherein said drying agent is a salt capable of forming a hydrate.
Claim 10
Dependent Claim
42 words
A multi-layer structure as claimed in claim 5 wherein said drying agent comprises as a main ingredient(s) at least one selected from monosodium phosphate, disodium phosphate, trisodium phosphate, trilithium phosphate and sodium pyrophosphate or a mixture of at least two of them.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-12-20 | 1992-06-20 | 1992-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-20 | 1996-06-20 | 1996-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-20 | 2000-06-20 | 2000-12-20 | $7700.00 | Window Closed / Lapsed |