US4686133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Closure material for sealing glass containers
Assignee: Takeda Pharmaceutical Co Ltd
•
Filing: 1985-02-22
•
Granted: 1987-08-11
•
Expires: 2005-02-22
Abstract
Abstract A closure material for sealing glass containers comprising a metal foil and a thermally adhesive composition layer formed on one surface of the metal foil and comprising a carboxyl-modified saponified product of ethylene-vinyl acetate copolymer and up to 30 parts by weight of an inorganic compound per 100 parts by weight of the carboxyl-modified saponified product, the carboxyl-modified saponified product being prepared by graft-polymerizing a carboxylic acid group-containing unsaturated compound with a saponified product of ethylene-vinyl acetate copolymer containing 50 to 97 mole % of ethylene.
Inventors
- 👤 Masamitsu Nakabayashi
- 👤 Hideo Kawai
- 👤 Suminori Tatsukawa
- 👤 Masayuki Kaji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:56
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/10; C09J; C09J151/00; C09J151/06; C08; C08L; C08L2666/00; C08L2666/54; C09K2200/00; C09K2200/02; C09K2200/0217; C09K2200/023; C09K2200/0239; C09K2200/0243; C09K2200/0252; C09K2200/0265; C09K2200/06; C09K2200/0615; C09K2200/0617; C09K2200/062; C09K2200/0622; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917; Y10T428/25; Y10T428/28; Y10T428/2804; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/2852; Y10T428/2857; Y10T428/2878; Y10T428/2891; Y10T428/31504; Y10T428/31678; Y10T428/31692
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
92 words
A closure material for sealing glass containers comprising a metal foil and a thermally adhesive composition layer formed on one surface of the metal foil and comprising a carboxyl-modified saponified product of ethylenevinyl acetate copolymer and 0.1 to 30 parts by weight of an inorganic compound per 100 parts by weight of the carboxyl-modified saponified product, the carboxyl-modified saponified product being prepared by graft-polymerizing acrylic acid with a saponified product of ethylene-vinyl acetate copolymer containing 50 to 97 mole % of ethylene and having a melt index of 1 to 300g/10 minutes.
Claim 2
Dependent Claim
92 words
A closure material for sealing glass containers comprising a metal foil and a thermally adhesive composition layer formed on one surface of the metal foil and comprising a carboxyl-modified saponified product of ethylenevinyl acetate copolymer and 0.1 to 30 parts by weight of an inorganic compound per 100 parts by weight of the carboxyl-modified saponified product, the carboxyl-modified saponified product being prepared by graft-polymerizing acrylic acid with a saponified product of ethylene-vinyl acetate copolymer containing 50 to 97 mole % of ethylene and having a melt index of 1 to 300g/10 minutes.
Claim 3
Dependent Claim
37 words
A closure material as defined in claim 1 wherein the metal foil is aluminum foil having a thickness of 20 to 100 μm, and the thermally adhesive composition layer has a thickness of 20 to 100 μm.
Claim 4
Dependent Claim
43 words
A closure material as defined in claim 1, wherein the carboxyl-modified saponified product has an acid equivalent weight of 1000 to 10000 g/equivalent in its entirety and the saponified product for the modification has a hydroxyl equivalent weight of 200 to 1000 g/equivalent.
Claim 5
Dependent Claim
42 words
A closure material as defined in claim 1 wherein the inorganic compound is at least one compound selected from the group consisting of oxides, hydroxides, carbonates and sulfates of magnesium, calcium, aluminum, titanium and silicon, talc, clay, feldspar powder, mica and barite.
Claim 6
Dependent Claim
19 words
A closure material as defined in claim 4 wherein the inorganic compound is one of calcium carbonate and talc.
Claim 7
Dependent Claim
21 words
A closure material as defined in claim 1 wherein the inorganic compound is 0.1 to 50 μm in mean particle size.
Claim 8
Dependent Claim
42 words
A closure material as defined in claim 1 wherein the thermally adhesive composition for forming the layer comprises 0.1 to 10 parts by weight of the inorganic compound per 100 parts by weight of the carboxyl-modified saponified product of ethylene-vinyl acetate copolymer.
Claim 9
Dependent Claim
26 words
A closure material as defined in claim 1 wherein a synthetic resin film layer is provided between the metal foil and the thermally adhesive composition layer.
Claim 10
Dependent Claim
23 words
A closure material as defined in claim 9 wherein the synthetic resin film layer is a film of one of polyethylene and polypropylene.
Claim 11
Dependent Claim
25 words
A closure material as defined in claim 1 wherein a corrosion inhibiting layer is provided between the metal foil and the thermally adhesive composition layer.
Claim 12
Dependent Claim
37 words
A closure material as defined in claim 1 wherein a print layer is formed on the other surface of the metal foil, and a corrosion inhibiting coat layer is formed on the surface of the print layer.
Claim 13
Dependent Claim
16 words
A closure material as defined in claim 1 for sealing glass containers made of soda-lime glass.
Claim 14
Dependent Claim
38 words
A closure material as defined in claim 1, wherein the thermally adhesive composition for forming the layer comprises 1 to 10 parts by weight of the inorganic compound per 100 parts by weight of the carboxyl-modified saponified product.
Claim 15
Dependent Claim
37 words
A closure material as defined in claim 1, wherein the thermally adhesive composition forming the layer comprises 1 to 5 parts by weight of the inorganic compound per 100 parts by weight of the carboxyl-modified saponified product.
References Cited (Backward Citations)
US4407689A
Cited
US4358493A
Cited
US4390552A
Cited
JPS5820604A
Cited
US4442129A
Cited
JPS6027533A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-10 | 1991-02-09 | 1991-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-10 | 1995-02-09 | 1995-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-10 | 1999-02-09 | 1999-08-11 | $7700.00 | Window Closed / Lapsed |