US4451526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayer composite material, especially for closures for plastic containers
Assignee: Compagnie Francaise de Raffinage SA
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Filing: 1982-08-20
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Granted: 1984-05-29
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Expires: 2002-08-20
Abstract
Abstract A multilayer composite material, suitable for capping plastic milk bottles and other containers, comprising; (a) a metal foil, (b) a polyolefin film, and (c) an adhesive layer bonding the metal foil and the polyolefin film together and formed of two compounds A and B; wherein said metal foil has a thickness between 25 and 75 microns; said polyolefin film has a thickness between 10 and 30 microns; and said adhesive layer has a thickness between 0.5 and 6 microns, and preferably between 2 and 5 microns.
Inventors
- 👤 Bruno Claude
- 👤 Jean-Jacques Labaig
- 👤 Christian Martinez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:41
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; B32B15/20; B32B27/00; B32B27/32; B32B7/00; B32B7/04; B32B7/12; B32B2311/00; B32B2311/24; B32B2323/00; B32B2323/10; B32B2435/00; B32B2435/02; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/28; Y10T428/2852; Y10T428/2878; Y10T428/2891; Y10T428/31504; Y10T428/31678; Y10T428/31692
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
143 words
A multilayer composite material intended in particular for the manufacture of covers or caps for the closure of a container, said composite material comprising (a) a metal foil, (b) a polyolefin film, and (c) an adhesive layer bonding the metal foil and the polyolefin film together and formed of two compounds A and B, compound A being a copolymer of an aliphatic monoolefin and an unsaturated monoethylenic carboxylic acid having good adhesion for the metal foil and the polyolefin film, and compound B being a compound effective to reduce the adhesion of compound A for the metal foil and/or the polyolefin film, the improvement in said composite material comprising said metal foil having a thickness between 25 and 75 microns; said polyofin film having a thickness between 10 and 30 microns; and said adhesive layer having a thickness between 0.5 and 6 microns.
Claim 2
Dependent Claim
143 words
A multilayer composite material intended in particular for the manufacture of covers or caps for the closure of a container, said composite material comprising (a) a metal foil, (b) a polyolefin film, and (c) an adhesive layer bonding the metal foil and the polyolefin film together and formed of two compounds A and B, compound A being a copolymer of an aliphatic monoolefin and an unsaturated monoethylenic carboxylic acid having good adhesion for the metal foil and the polyolefin film, and compound B being a compound effective to reduce the adhesion of compound A for the metal foil and/or the polyolefin film, the improvement in said composite material comprising said metal foil having a thickness between 25 and 75 microns; said polyofin film having a thickness between 10 and 30 microns; and said adhesive layer having a thickness between 0.5 and 6 microns.
Claim 3
Dependent Claim
36 words
A composite material according to claim 1, wherein compound A is a copolymer of propylene and acrylic acid; compound B is a copolymer of ethylene and acrylic acid; and the polyolefin film is a polypropylene film.
Claim 4
Dependent Claim
42 words
A composite material according to claim 1, wherein said metal foil has a thickness between 30 and 70 microns; said polyopefin film has a thickness between 15 and 25 microns; and said adhesive layer has a thickness between 2 and 5 microns.
Claim 5
Dependent Claim
15 words
A composite material according to claim 3, wherein the metal foil is an aluminum foil.
Claim 6
Dependent Claim
36 words
A composite material according to claim 4, wherein compound A is a copolymer of propylene and acrylic acid; compound B is a copolymer of ethylene and acrylic acid; and the polyolefin film is a polypropylene film.
Claim 7
Dependent Claim
15 words
A composite material according to claim 1, wherein the metal foil is an aluminum foil.
Claim 8
Dependent Claim
36 words
A composite material according to claim 6, wherein compound A is a copolymer of propylene and acrylic acid; compound B is a copolymer of ethylene and acrylic acid; and the polyolefin film is a polypropylene film.
Claim 9
Dependent Claim
35 words
Method of capping a bottle made of high-density polyethylene and suitable to hold sterilized milk, comprising heat sealing the composite material according to one of claims 1 to 7 to the bottle over its opening.
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) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |