US4565720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Packaging bag
Assignee: Idemitsu Petrochemical Co Ltd
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Filing: 1983-07-27
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Granted: 1986-01-21
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Expires: 2003-07-27
Abstract
Abstract A packaging bag either of two layer structure comprising an outer layer and an inner layer or of three layer structure comprising an outer layer, an intermediate layer, and an outer layer is disclosed, wherein the outer layer is made of a low density ethylene-based polymer or a mixture of said ethylene-based polymer and an ethylene-vinyl acetate copolymer, and the inner or intermediate layer is made of a mixture of high density polyethylene and an ethylene-α-olefin copolymer. The packaging bag of this invention is much superior in film puncture strength, tear strength, etc. to conventional bags and moreover shows very high seal strength and low temperature impact resistance. Thus, the packaging bag of this invention is suitable for storage and conveyance of heavy materials, particularly angular heavy materials such as fowl. Moreover, the packaging bag has good anti-block properties and thus is suitable for automatic packaging.
Inventors
- 👤 Kenta Yaeo
- 👤 Shinji Kawamura
- 👤 Yoshiyuki Mihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:19
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; B65; B65D; B65D31/00; B65D31/02; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/50; B32B2307/558; B32B2307/70; B32B2307/746; B32B2439/00; B32B2439/02; B32B2439/06; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
56 words
A packaging bag comprising an outer layer made of a low density ethylene-based polymer or a mixture of said ethylene-based polymer and an ethylene-vinyl acetate copolymer, and an inner layer made of a mixture of 50 to 90% by weight of a high density polyethylene and from 50 to 10% by weight of an ethylene-α-olefin copolymer.
Claim 2
Dependent Claim
56 words
A packaging bag comprising an outer layer made of a low density ethylene-based polymer or a mixture of said ethylene-based polymer and an ethylene-vinyl acetate copolymer, and an inner layer made of a mixture of 50 to 90% by weight of a high density polyethylene and from 50 to 10% by weight of an ethylene-α-olefin copolymer.
Claim 3
Dependent Claim
42 words
The bag as claimed in claim 1, wherein the low density ethylene-based polymer of the outer layer has a density of from 0.91 to 0.94 gram per cubic centimeter and a melt index of from 0.1 to 20 grams per ten minutes.
Claim 4
Dependent Claim
41 words
The bag as claimed in claim 2, wherein the low density ethylene-based copolymer of the outer layer has a density of from 0.915 to 0.938 gram per cubic centimeter and melt index of from 0.2 to 10 grams per ten minutes.
Claim 5
Dependent Claim
32 words
The bag as claimed in claim 1, wherein the low density ethylene-based polymer of the outer layer is a copolymer of ethylene and an α-olefin containing from 3 to 12 carbon atoms.
Claim 6
Dependent Claim
26 words
The bag as claimed in claim 4, wherein the amount of α-olefin of said copolymer of ethylene and α-olefin is from 1 to 20% by weight.
Claim 7
Dependent Claim
38 words
The bag as claimed in claim 1, wherein the outer layer is a mixture of from 10 to 95% by weight of the low density polyethylene and from 90 to 5% by weight of the ethylene-vinyl acetate copolymer.
Claim 8
Dependent Claim
38 words
The bag as claimed in claim 6, wherein the amount of said low density polyethylene of said mixture is 60 to 90% by weight and the amount of said ethylene-vinyl acetate copolymer is 40 to 10% by weight.
Claim 9
Dependent Claim
41 words
The bag as claimed in claim 1, wherein the high density polyethylene of the inner layer has a density of from 0.94 to 0.97 gram per cubic centimeter and a melt index of from 0.01 to 4 grams per ten minutes.
Claim 10
Dependent Claim
40 words
The bag as claimed in claim 8, wherein the high density polyethylene of the outer layer has a density of 0.945 to 0.965 gram per cubic centimeter and a melt index of from 0.02 to 2.0 grams per ten minutes.
Claim 11
Dependent Claim
40 words
The bag as claimed in claim 1, wherein the ethylene-α-olefin copolymer of the inner layer has a density of from 0.91 to 0.94 gram per cubic centimeter and a melt index of from 0.3 to 10 grams per ten minutes.
Claim 12
Dependent Claim
20 words
The bag as claimed in claim 1, wherein the ethylene-α-olefin copolymer of the inner layer is an ethylene-propylene-based copolymer elastomer.
Claim 13
Dependent Claim
21 words
The bag as claimed in claim 11, wherein said ethylene-propylene-based copolymer elastomer has a Mooney viscosity of from 40 to 150.
Claim 14
Dependent Claim
39 words
The bag as claimed in claim 1, wherein said high density polyethylene is present in an amount of from 60 to 90% by weight and said ethylene-α-olefin copolymer is present in an amount of 40 to 10% by weight.
Claim 15
Dependent Claim
25 words
The bag as claimed in claim 1, wherein the ratio of the thickness of the outer layer to the inner layer is 1:99 to 60:40.
Claim 16
Dependent Claim
79 words
A packaging bag comprising an outer layer, an inner layer and an intermediate layer sandwiched between said outer and inner layers, said outer and inner layers each being made of a low density ethylene-based polymer or a mixture of said ethylene-based polymer and an ethylene-vinyl acetate copolymer, and said intermediate layer being made of a mixture of from 50 to 90% by weight of a high density polyethylene and from 50% to 10% by weight of an ethylene-α-olefin copolymer.
Claim 17
Dependent Claim
79 words
A packaging bag comprising an outer layer, an inner layer and an intermediate layer sandwiched between said outer and inner layers, said outer and inner layers each being made of a low density ethylene-based polymer or a mixture of said ethylene-based polymer and an ethylene-vinyl acetate copolymer, and said intermediate layer being made of a mixture of from 50 to 90% by weight of a high density polyethylene and from 50% to 10% by weight of an ethylene-α-olefin copolymer.
Claim 18
Dependent Claim
44 words
The bag as claimed in claim 15, wherein the low density ethylene-based polymer of the outer and inner layers has a density of from 0.91 to 0.94 gram per cubic centimeter and a melt index of from 0.1 to 20 grams per ten minutes.
Claim 19
Dependent Claim
43 words
The bag as claimed in claim 16, wherein the low density ethylene-based copolymer of the outer and inner layers has a density of from 0.915 to 0.938 gram per cubic centimeter and melt index of from 0.2 to 10 grams per ten minutes.
Claim 20
Dependent Claim
32 words
The bag as claimed in claim 15, wherein the low density ethylene-based polymer of the outer layer is a copolymer of ethylene and an α-olefin containing from 3 to 12 carbon atoms.
Claim 21
Dependent Claim
26 words
The bag as claimed in claim 18, wherein the amount of α-olefin of said copolymer of ethylene and α-olefin is from 1 to 20% by weight.
Claim 22
Dependent Claim
38 words
The bag as claimed in claim 15, wherein the outer layers are a mixture of from 10 to 95% by weight of the low density polyethylene and from 90 to 5% by weight of the ethylene-vinyl acetate copolymer.
Claim 23
Dependent Claim
38 words
The bag as claimed in claim 20, wherein the amount of said low density polyethylene of said mixture is 60 to 90% by weight and the amount of said ethylene-vinyl acetate copolymer is 40 to 10% by weight.
Claim 24
Dependent Claim
41 words
The bag as claimed in claim 15, wherein the high density polyethylene of the intermediate layer has a density of from 0.94 to 0.97 gram per cubic centimeter and a melt index of from 0.01 to 4 grams per ten minutes.
Claim 25
Dependent Claim
40 words
The bag as claimed in claim 22, wherein the high density polyethylene of the outer layer has a density of 0.945 to 0.965 gram per cubic centimeter and a melt index of from 0.02 to 2.0 grams per ten minutes.
Claim 26
Dependent Claim
40 words
The bag as claimed in claim 15, wherein the ethylene-α-olefin copolymer of the intermediate layer has a density of from 0.91 to 0.94 gram per cubic centimeter and a melt index of from 0.3 to 10 grams per ten minutes.
Claim 27
Dependent Claim
20 words
The bag as claimed in claim 15, wherein the ethylene-α-olefin copolymer of the intermediate layer is an ethylene-propylene-based copolymer elastomer.
Claim 28
Dependent Claim
21 words
The bag as claimed in claim 25, wherein said ethylene-propylene-based copolymer elastomer has a Mooney viscosity of from 40 to 150.
Claim 29
Dependent Claim
39 words
The bag as claimed in claim 15, wherein said high density polyethylene is present in an amount of from 60 to 90% by weight and said ethylene-α-olefin copolymer is present in an amount of 40 to 10% by weight.
Claim 30
Dependent Claim
44 words
The bag as claimed in claim 15, wherein the thickness of each of the outer layer and the inner layer is from 1 to 40% and the thickness of the intermediate layer is from 20 to 98% of the total thickness of the bag.
Claim 31
Dependent Claim
25 words
The bag as claimed in claim 28, wherein the thickness of the intermediate layer is 40 to 90% of the total thickness of the bag.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-20 | 1989-07-22 | 1990-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-20 | 1993-07-22 | 1994-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-20 | 1997-07-22 | 1998-01-21 | $7700.00 | Window Closed / Lapsed |