US4398644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-layer closure, particularly for closing plastic containers
Assignee: Compagnie Francaise de Raffinage SA
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Filing: 1981-10-07
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Granted: 1983-08-16
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Expires: 2001-10-07
Abstract
Abstract The invention relates to a two-layer composite material comprising a metal foil and an adhesive layer. The adhesive layer is formed of a mixture of two compounds A and B, compound A being a copolymer of an aliphatic monoolefin and a monoethylenically unsaturated carboxylic acid which has good adhesion for the metal foil and the container, and compound B being a compound adapted to reduce the adhesion of compound A for the metal foil and/or the container. Said composite material is intended in particular for the fabrication of caps serving as closures for containers.
Inventors
- 👤 Bruno Claude
- 👤 Daniel Pellerin
- 👤 Jean-Jacques Labaig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:25
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/14; B05D7/16; B05D5/00; B05D5/10; C; C09; C09J; C09J7/00; C09J7/20; C09J7/22; C09J7/30; C09J7/35; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2804; Y10T428/2852; Y10T428/2878; Y10T428/2891; Y10T428/31504; Y10T428/31678; Y10T428/31692
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
122 words
An article of manufacture comprising a container formed of polyethylene or polypropylene having an opening therein, a metal-foil closure heat-sealed to said container across said opening, said closure comprising a metal foil, an adhesive layer bonded to one side of said foil, said adhesive layer being formed of a mixture of two compounds A and B, compound A being a copolymer of an aliphatic monoolefin and of a monoethylenically unsaturated carboxylic acid capable of having good heat-sealed adhesion to the metal foil and to the container, and compound B being a compound which reduces said adhesion of compound A for the container sufficiently that a viable capping seal was formed by heat sealing and yet closure is conveniently peelable from said container.
Claim 2
Dependent Claim
122 words
An article of manufacture comprising a container formed of polyethylene or polypropylene having an opening therein, a metal-foil closure heat-sealed to said container across said opening, said closure comprising a metal foil, an adhesive layer bonded to one side of said foil, said adhesive layer being formed of a mixture of two compounds A and B, compound A being a copolymer of an aliphatic monoolefin and of a monoethylenically unsaturated carboxylic acid capable of having good heat-sealed adhesion to the metal foil and to the container, and compound B being a compound which reduces said adhesion of compound A for the container sufficiently that a viable capping seal was formed by heat sealing and yet closure is conveniently peelable from said container.
Claim 3
Dependent Claim
30 words
An article according to claim 1, wherein said container is polyethylene and said compound A is a graft copolymer prepared by polymerization of ethylene followed by grafting of acrylic acid.
Claim 4
Dependent Claim
21 words
An article according to claim 2, wherein compound A is high-density polyethylene grafted with less than five weight percent acrylic acid.
Claim 5
Dependent Claim
25 words
An article according to claim 3, wherein compound B is selected from the group consisting of low-density polyethylene, high-density polyethylene, polyisobutylene, polystyrene, paraffin, and wax.
Claim 6
Dependent Claim
50 words
An article according to claim 4, wherein said metal foil is aluminum of a thickness from 30 to 80 microns; said adhesive layer is less than 20 microns thick and contains from 10 to 90 wt. % of compound A and from 90 to 10 wt. % of compound B.
Claim 7
Dependent Claim
30 words
An article according to claim 1, wherein said container is polypropylene and said compound A is a graft copolymer prepared by polymerization of propylene followed by grafting of acrylic acid.
Claim 8
Dependent Claim
34 words
An article according to claim 6, wherein compound B is selected from the group consisting of copolymers of ethylene and propylene, and copolymers prepared by polymerization of ethylene followed by grafting of acrylic acid.
Claim 9
Dependent Claim
50 words
An article according to claim 7, wherein said metal foil is aluminum of a thickness from 30 to 80 microns, said adhesive layer is less than 20 microns thick and contains from 10 to 90 wt. % of compound A and from 90 to 10 wt. % of compound B.
Claim 10
Dependent Claim
26 words
An article according to one of claims 1, 2, or 3, wherein compound B is selected from the group consisting of polyisobutylene, polystyrene, paraffin, and wax.
Claim 11
Dependent Claim
45 words
An article according to claims 5 or 8, wherein said mixture of compounds A and B is such that the heat seal closure on said container is peelable with a pulling force of 0.6 to 1.25 daN perpendicularly-applied at a constant velocity of 500 mm/min.
References Cited (Backward Citations)
GB964977A
Cited
US4131211A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-15 | 1987-02-14 | 1987-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-15 | 1991-02-14 | 1991-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-15 | 1995-02-14 | 1995-08-16 | $7700.00 | Window Closed / Lapsed |