Patent US4605576A successfully refreshed from Google Patents.
US4605576A
Expired / Lapsed
US
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Multilayer plastic articles
Assignee: Graham Packaging Plastic Products Inc
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Filing: 1984-10-22
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Granted: 1986-08-12
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Expires: 2004-10-22
Abstract
Abstract A multilayer high gas barrier plastic article wherein the article comprises a laminate including at least one layer of a high gas barrier polymer and at least one layer composed of an intimate blend of a propylene based polymer and an amount of linear low density polyethylene wherein said linear low density polyethylene is up to thirty weight percent or less of the blend. The multilayer high gas barrier article incorporating the intimate blend in conjunction with a high gas barrier polymer layer has good gas barrier characteristics, good mechanical properties and excellent low temperature drop impact characteristics, particularly when fabricated into free-standing bottles.
Inventors
- 👤 Saleh A. Jabarin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:25
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; B32B27/30; B32B27/306; B32B7/00; B32B7/04; B32B7/12; C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; C08L23/14; C08L23/142; B32B2270/00; B32B2272/00; B32B2323/00; B32B2323/04; B32B2323/046; B32B2323/10; B32B2439/00; C08L23/04; C08L23/06; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/1341; Y10T428/1352; Y10T428/1379; Y10T428/1383; Y10T428/24; Y10T428/24942; Y10T428/24992; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
108 words
A multilayer plastic structure comprising a laminate of at least one layer of a high gas barrier polymer and at least one layer of an intimate blend of at least one propylene based polymer and at least one linear low density polyethylene wherein the total amount of the linear low density polyethylene is equal to or less than about 30 percent by weight of said blend, the structure having an outstanding balance of properties including gas barrier resistance including permeability to oxygen of not more than 3 cc-mil/100 sq. in. day, resistance to delamination, top load strength and low temperature drop impact resistance according to ASTM test 2463-74.
Claim 2
Dependent Claim
108 words
A multilayer plastic structure comprising a laminate of at least one layer of a high gas barrier polymer and at least one layer of an intimate blend of at least one propylene based polymer and at least one linear low density polyethylene wherein the total amount of the linear low density polyethylene is equal to or less than about 30 percent by weight of said blend, the structure having an outstanding balance of properties including gas barrier resistance including permeability to oxygen of not more than 3 cc-mil/100 sq. in. day, resistance to delamination, top load strength and low temperature drop impact resistance according to ASTM test 2463-74.
Claim 3
Dependent Claim
14 words
The invention defined in claim 1 wherein the propylene based polymer is polypropylene homopolymer.
Claim 4
Dependent Claim
25 words
The invention defined in claim 1 wherein the propylene based polymer is a propylene-ethylene copolymer including about 2-5 mole percent ethylene copolymerized with the propylene.
Claim 5
Dependent Claim
36 words
The invention defined in claim 1 wherein the linear low density polyethylene has a density of less than about 0.93 grams per cubic centimeter and a melt index of less than 10 grams per ten minutes.
Claim 6
Dependent Claim
33 words
The invention defined in claim 1 wherein said linear low density polyethylene has a density of about 0.92 grams per cubic centimeter and a melt index of less than about 2 grams/10 minutes.
Claim 7
Dependent Claim
24 words
The invention defined in claim 1 wherein said linear low density polyethylene is equal to about 20 percent by weight of the said blend.
Claim 8
Dependent Claim
9 words
A container formed from the structure of claim 1.
Claim 9
Dependent Claim
17 words
The invention defined in claim 1 wherein said high gas barrier polymer is an ethylene-vinyl alcohol copolymer.
Claim 10
Dependent Claim
122 words
A multilayer plastic structure comprising a laminate of a pair of outer layers and a centrally located core layer wherein said centrally located core layer includes at least one high gas barrier polymer and said outer layers are each an intimate blend of at least one propylene based polymer and at least one linear low density polyethylene with the total amount of the linear low density polyethylene being equal to or less than 30 percent by weight of said blend, the structure having an outstanding balance of properties including gas barrier resistance including permeability to oxygen of not more than 3 cc-mil/100 sq. in. day, resistance to delamination, top load strength and low temperature drop impact resistance according to ASTM test 2463-74.
Claim 11
Dependent Claim
122 words
A multilayer plastic structure comprising a laminate of a pair of outer layers and a centrally located core layer wherein said centrally located core layer includes at least one high gas barrier polymer and said outer layers are each an intimate blend of at least one propylene based polymer and at least one linear low density polyethylene with the total amount of the linear low density polyethylene being equal to or less than 30 percent by weight of said blend, the structure having an outstanding balance of properties including gas barrier resistance including permeability to oxygen of not more than 3 cc-mil/100 sq. in. day, resistance to delamination, top load strength and low temperature drop impact resistance according to ASTM test 2463-74.
Claim 12
Dependent Claim
14 words
The invention defined in claim 9 wherein the propylene based polymer is polypropylene homopolymer.
Claim 13
Dependent Claim
25 words
The invention defined in claim 9 wherein the propylene based polymer is a propylene-ethylene copolymer including about 2-5 mole percent ethylene copolymerized with the propylene.
Claim 14
Dependent Claim
37 words
The invention defined in claim 9 wherein the linear low density polyethylene has a density of less than about 0.93 grams per cubic centimeter and a melt index of less than about 10 grams per ten minutes.
Claim 15
Dependent Claim
35 words
The invention defined in claim 9 wherein said linear low density polyethylene has a density of about 0.92 grams per cubic centimeter and a melt index of less than about 2 grams per ten minutes.
Claim 16
Dependent Claim
24 words
The invention defined in claim 9 wherein said linear low density polyethylene is equal to about 20 percent by weight of the said blend.
Claim 17
Dependent Claim
9 words
A container formed from the structure of claim 9.
Claim 18
Dependent Claim
16 words
The invention defined in claim 9 wherein said high gas barrier polymer is an ethylene-vinyl-alcohol copolymer.
Claim 19
Dependent Claim
144 words
A multilayer plastic structure comprising a laminate of a pair of outer layers, a pair of intermediate adhesive layers and a centrally located core layer wherein: said outer layers being formed from an intimate blend of at least one propylene based polymer and at least one linear low density polyethylene wherein the toal amount of the linear low density polyethylene is equal to or less than about 30 percent by weight of said blend; said intermediate adhesive layers being formed from at least one olefinic hydrocarbon polymer; and said centrally located core layer being formed from at least one high gas barrier polymer, the structure having an outstanding balance of properties including gas barrier resistance including permeability to oxygen of not more than 3 cc-mil/100 sq.in. day, resistance to delamination, top load strength and low temperature drop impact resistance according to ASTM test 2463-74.
Claim 20
Dependent Claim
144 words
A multilayer plastic structure comprising a laminate of a pair of outer layers, a pair of intermediate adhesive layers and a centrally located core layer wherein: said outer layers being formed from an intimate blend of at least one propylene based polymer and at least one linear low density polyethylene wherein the toal amount of the linear low density polyethylene is equal to or less than about 30 percent by weight of said blend; said intermediate adhesive layers being formed from at least one olefinic hydrocarbon polymer; and said centrally located core layer being formed from at least one high gas barrier polymer, the structure having an outstanding balance of properties including gas barrier resistance including permeability to oxygen of not more than 3 cc-mil/100 sq.in. day, resistance to delamination, top load strength and low temperature drop impact resistance according to ASTM test 2463-74.
Claim 21
Dependent Claim
14 words
The invention defined in claim 17 wherein the propylene based polymer is polypropylene homopolymer.
Claim 22
Dependent Claim
25 words
The invention defined in claim 17 wherein the propylene based polymer is a propylene-ethylene copolymer including about 2-5 mole percent ethylene copolymerized with the propylene.
Claim 23
Dependent Claim
37 words
The invention defined in claim 17 wherein the linear low density polyethylene has a density of less than about 0.93 grams per cubic centimeter and a melt index of less than about 10 grams per ten minutes.
Claim 24
Dependent Claim
35 words
The invention defined in claim 17 wherein the linear low density polyethylene has a density of about 0.92 grams per cubic centimeter and a melt index of less than about 2 grams per ten minutes.
Claim 25
Dependent Claim
24 words
The invention defined in claim 17 wherein said linear low density polyethylene is equal to about 20 percent by weight of the said blend.
Claim 26
Dependent Claim
9 words
A container formed from the structure of claim 17.
Claim 27
Dependent Claim
17 words
The invention defined in claim 15 wherein the high gas barrier polymer is an ethylene-vinyl alcohol copolymer.
Claim 28
Dependent Claim
48 words
A composition of matter comprising a blend of a propylene based polymer that is a copolymer of ethylene and propylene and a linear low density polyethylene wherein the total amount of the linear low density polyethylene is no more than about 20 percent by weight of said blend.
Claim 29
Dependent Claim
48 words
A composition of matter comprising a blend of a propylene based polymer that is a copolymer of ethylene and propylene and a linear low density polyethylene wherein the total amount of the linear low density polyethylene is no more than about 20 percent by weight of said blend.
Claim 30
Dependent Claim
24 words
The invention defined in claim 25 wherein the copolymer is about 2 to 4 mole percent ethylene and 96 to 98 mole percent polypropylene.
Claim 31
Dependent Claim
35 words
The invention defined in claim 25 wherein the propylene based polymer is a propylene-ethylene copolymer including about 2-5 mole percent ethylene copolymerized with the propylene, the copolymer being about 20 weight percent of the blend.
Claim 32
Dependent Claim
36 words
The invention defined in claim 25 wherein the linear low density polyethylene has a density of less than about 0.93 grams per cubic centimeter and a melt index of less than 10 grams per ten minutes.
Claim 33
Dependent Claim
33 words
The invention defined in claim 25 wherein said linear low density polyethylene has a density of about 0.92 grams per cubic centimeter and a melt index of less than about 2 grams/10 minutes.
Claim 34
Dependent Claim
46 words
The invention defined in claim 25 wherein said linear low density polyethylene is equal to about 20 percent by weight of the said blend and the copolymer has a density of about 0.89 to 0.9/gms/cc and a melt index of less than about 30 grams/10 min.
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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) | 1989-08-11 | 1990-02-10 | 1990-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-11 | 1994-02-10 | 1994-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-11 | 1998-02-10 | 1998-08-12 | $7700.00 | Window Closed / Lapsed |