US5318824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Packaging structure
Assignee: Taisei Kako Co Ltd
•
Filing: 1992-10-14
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Granted: 1994-06-07
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Expires: 2012-10-14
Abstract
Abstract A packaging structure composed of a composite synthetic resin sheet having a depressed portion formed therein for holding an article and a metal foil bonded to the sheet, said composite sheet being a three-layer sheet composed of an interlayer of high-density polyethylene and outside layers of a propylene polymer bonded to both surfaces of the interlayer, the interlayer having a thickness of 120 to 800 micrometers, each of the outside layers having a thickness of 15 to 80 micrometers, and the thickness of the interlayer being at least 2.5 times the total thickness of both outside layers; a process for production thereof; and a process for producing a composite (synthetic) resin sheet suitable as a material for the aforesaid packaging structure.
Inventors
- 👤 Kozo Itaya
- 👤 Hirotaka Nishida
- 👤 Kazutoshi Fukuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:26
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/24612; Y10T428/24628; Y10T428/24661; Y10T428/24669; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
97 words
A packaging structure composed of a composite synthetic resin sheet having a depressed portion formed therein for holding an article and a metal foil bonded to the sheet, said composite sheet being a three-layer sheet composed of an interlayer of high-density polyethylene and outside layers of a propylene polymer bonded to both surfaces of the interlayer, the interlayer having a thickness of 120 to 800 micrometers, each of the outside layers having a thickness of 15 to 80 micrometers, and the thickness of the interlayer being at least 2.5 times the total thickness of both outside layers.
Claim 2
Dependent Claim
97 words
A packaging structure composed of a composite synthetic resin sheet having a depressed portion formed therein for holding an article and a metal foil bonded to the sheet, said composite sheet being a three-layer sheet composed of an interlayer of high-density polyethylene and outside layers of a propylene polymer bonded to both surfaces of the interlayer, the interlayer having a thickness of 120 to 800 micrometers, each of the outside layers having a thickness of 15 to 80 micrometers, and the thickness of the interlayer being at least 2.5 times the total thickness of both outside layers.
Claim 3
Dependent Claim
41 words
The packaging structure of claim 1 wherein the propylene polymer constituting the outside layers is composed of 60 to 97% by weight of polypropylene and 40 to 3% by weight of an ethylene polymer, the total proportion being 100% by weight.
Claim 4
Dependent Claim
62 words
The packaging structure of claim 2 wherein the polypropylene is a polymer containing at least 90 mole % of propylene units and having an MFR 2 (230° C.) of 0.5 to 20, and the ethylene polymer is a homopolymer of ethylene or a copolymer of ethylene with at least one other alpha-olefin each containing 50 to 100 mole % of ethylene units.
Claim 5
Dependent Claim
35 words
The packaging structure of claim 1 wherein the high-density polyethylene constituting the interlayer of the composite sheet has an MFR 2 (190° C.) of 2 to 20 and a density of 0.94 to 0.98 g/cc.
Claim 6
Dependent Claim
24 words
The packaging structure of claim 4 wherein the high-density polyethylene has an MFR 10 (190° C.)/MFR 2 (190° C.) ratio of 1 to 10.
Claim 7
Dependent Claim
136 words
A packaging structure composed of a composite synthetic resin sheet having a depressed portion pocket formed therein for holding an article and a metal foil bonded to the sheet, said composite sheet being a three-layer sheet composed of an interlayer of high-density polyethylene and outside layers of a propylene polymer bonded to both surfaces of the interlayer, the interlayer of polyethylene is composed of 50 to 100 mole % ethylene and the outside propylene polymer layers are composed of 60 to 97% by weight of polypropylene and 40 to 3% by weight of ethylene polymer, the interlayer having a thickness of 120 to 800 micrometers, each of the outside layers having a thickness of 15 to 80 micrometers, and the thickness of the interlayer being at least 2.5 times the total thickness of both outside layers.
Claim 8
Dependent Claim
136 words
A packaging structure composed of a composite synthetic resin sheet having a depressed portion pocket formed therein for holding an article and a metal foil bonded to the sheet, said composite sheet being a three-layer sheet composed of an interlayer of high-density polyethylene and outside layers of a propylene polymer bonded to both surfaces of the interlayer, the interlayer of polyethylene is composed of 50 to 100 mole % ethylene and the outside propylene polymer layers are composed of 60 to 97% by weight of polypropylene and 40 to 3% by weight of ethylene polymer, the interlayer having a thickness of 120 to 800 micrometers, each of the outside layers having a thickness of 15 to 80 micrometers, and the thickness of the interlayer being at least 2.5 times the total thickness of both outside layers.
Claim 9
Dependent Claim
61 words
The packaging structure of claim 6 wherein the polypropylene is a polymer containing at least 90 mole % propylene units and having an MFR 2 (230° C.) of 0.5 to 20, and the ethylene polymer is a homopolymer of ethylene or a copolymer of ethylene with at least one other alpha-olefin, each containing at least 50 mole % of ethylene units.
Claim 10
Dependent Claim
35 words
The packaging structure of claim 6 wherein the high-density polyethylene constituting the interlayer of the composite sheet has an MFR 2 (190° C.) of 2 to 20 and a density of 0.94 to 0.98 g/cc.
Claim 11
Dependent Claim
24 words
The packaging structure of claim 8 wherein the high-density polyethylene has an MFR 10 (190° C.)/MFR 2 (190° C.) ratio of 1 to 10.
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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) | 1997-06-06 | 1997-12-06 | 1998-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-06-06 | 2001-12-06 | 2002-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-06-06 | 2005-12-06 | 2006-06-07 | $7700.00 | Window Closed / Lapsed |