US4533576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite material for packaging containers
Assignee: Toyo Seikan Group Holdings Ltd
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Filing: 1983-08-03
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Granted: 1985-08-06
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Expires: 2003-08-03
Abstract
Abstract A composite material for packaging containers which has excellent sealability, easy openability and excellent flavor-retaining property is provided. The composite material consists of a metallic foil and a thermoplastic resin selected from the group consisting of polyolefinic resins, polyester resins, polyamide resins, polycarbonate resins and mixtures thereof, said thermoplastic resin layer having a thickness of 1 to 20 microns and a surface roughness of not more than 4.0 μm Rmax L0.80 mm. The thermoplastic resin has a carbonyl concentration of 1 to 600 milliequivalents/100 g of resin for the polyolefinic resins, 1,000 to 1,300 milliequivalents/100 g of resin for the polyester resins, 500 to 1,200 milliequivalents/100 g of resin for the polyamide resins and 600 to 800 milliequivalents/100 g of resin for the polycarbonate resins.
Inventors
- 👤 Toshifumi Tanahashi
- 👤 Senji Itoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:45
CPC Classifications
B; B65; B65D; B65D41/00; B32; B32B; B32B15/00; B32B15/04; B32B15/08; B32B15/085; B32B27/00; B32B27/32; B65D15/00; B65D15/02; B65D15/04; B65D15/08; B65D53/00; B65D53/04; B65D75/00; B65D75/52; B65D75/58; B65D75/5894; B32B2309/00; B32B2309/08; B32B2309/10; B32B2309/105; B32B2310/00; B32B2310/08; B32B2310/0806; B32B2310/0812; B32B2439/00; B32B2439/70; Y; Y10; Y10S; Y10S206/00; Y10S206/828; Y10S220/00; Y10S220/906; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/24996; Y10T428/25; Y10T428/254; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/31507; Y10T428/31678; Y10T428/31681; Y10T428/31692; Y10T428/31699; Y10T428/31725; Y10T428/31736; Y10T428/31739; Y10T428/31743; Y10T428/31746
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
113 words
A composite material for packaging containers, said composite material consisting of a metallic foil and a thermoplastic resin selected from the group consisting of polyolefinic resins, polyester resins, polyamide resins, polycarbonate resins and mixtures thereof, said thermoplastic resin layer having a thickness of 1 to 20 microns and a surface roughness of not more than 4.0 μm Rmax L0.80 mm, said thermoplastic resin having a carbonyl concentration of 1 to 600 milliequivalents/100 g of resin for the polyolefinic resins, 1,000 to 1,300 milliequivalents/100 g of resin for the polyester resins, 500 to 1,200 milliequivalents/100 g of resin for the polyamide resins and 600 to 800 milliequivalents/100 g of resin for the polycarbonate resins.
Claim 2
Dependent Claim
113 words
A composite material for packaging containers, said composite material consisting of a metallic foil and a thermoplastic resin selected from the group consisting of polyolefinic resins, polyester resins, polyamide resins, polycarbonate resins and mixtures thereof, said thermoplastic resin layer having a thickness of 1 to 20 microns and a surface roughness of not more than 4.0 μm Rmax L0.80 mm, said thermoplastic resin having a carbonyl concentration of 1 to 600 milliequivalents/100 g of resin for the polyolefinic resins, 1,000 to 1,300 milliequivalents/100 g of resin for the polyester resins, 500 to 1,200 milliequivalents/100 g of resin for the polyamide resins and 600 to 800 milliequivalents/100 g of resin for the polycarbonate resins.
Claim 3
Dependent Claim
14 words
The composite material of claim 1 wherein the thermoplastic resin is a polyolefinic resin.
Claim 4
Dependent Claim
17 words
The composite material of claim 2 wherein the polyolefinic resin has an MI of 30 to 300.
Claim 5
Dependent Claim
41 words
The composite material of claim 1 wherein the composite material is produced by coating particles of said thermoplastic resin on one surface of the metallic foil, preheating the coating by high-frequency induction heating, and thereafter rolling the coating by a roll.
Claim 6
Dependent Claim
14 words
The composite material of claim 1 which is for use in food packaging containers.
Claim 7
Dependent Claim
16 words
The composite material of claim 5 which is for use as a packing material for caps.
Claim 8
Dependent Claim
14 words
The composite material of claim 5 which is for use as a can body.
Claim 9
Dependent Claim
41 words
The composite material of claim 2 wherein the composite material is produced by coating particles of said thermoplastic resin on one surface of the metallic foil, preheating the coating by high-frequency induction heating, and thereafter rolling the coating by a roll.
Claim 10
Dependent Claim
41 words
The composite material of claim 3 wherein the composite material is produced by coating particles of said thermoplastic resin on one surface of the metallic foil, preheating the coating by high-frequency induction heating, and thereafter rolling the coating by a roll.
Claim 11
Dependent Claim
14 words
The composite material of claim 2 which is for use in food packaging containers.
Claim 12
Dependent Claim
14 words
The composite material of claim 3 which is for use in food packaging containers.
Claim 13
Dependent Claim
14 words
The composite material of claim 4 which is for use in food packaging containers.
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) | 1988-08-05 | 1989-02-04 | 1989-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-05 | 1993-02-04 | 1993-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-05 | 1997-02-04 | 1997-08-06 | $7700.00 | Window Closed / Lapsed |