Patent US2881695A successfully refreshed from Google Patents.
Patent US3962396A successfully refreshed from Google Patents.
US3962396A
Expired / Lapsed
US
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Process for manufacturing a triple-wall container
Assignee: Toray Industries Inc
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Filing: 1974-03-07
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Granted: 1976-06-08
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Expires: 1994-03-07
Abstract
Abstract A process for manufacturing a thermoplastic polymer container having a triple-wall structure is provided in which the outer and inner laminates are composed of an olefin polymer and the medial laminate is composed of polyamide. The medial polyamide laminate is characterized as containing, incorporated therein, 3 to 45% by weight of an ethylene copolymer containing 0.1 to 10% by mole, in polymerized form, of at least one metal salt of acrylic or methacrylic acid, and having a thickness of 2 to 30% by weight based on the total thickness of the three laminates. The container is manufactured by extruding the polymer melts while the three independent streams of the polymer melts to be formed into the three laminates are joined together within a die such that the thickness of said medial laminate is 2 to 30%, based on the total thickness of the three laminates, and then blow-molding the extruded composite polymer tube into the shape of a container.
Inventors
- 👤 Katuya Ono
- 👤 Koji Kozuka
- 👤 Yoshiyuki Komuro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:34
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/30; B29C48/32; B29C48/335; B29C48/337; B29C48/338; B29C49/00; B29C49/0005; B29C49/22; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/32; B32B27/34; B65; B65D; B65D1/00; B65D1/22; B65D1/26; B65D1/28; B29C2949/00; B29C2949/07; B29C2949/081; B29C2949/0811; B29C2949/082; B32B2250/00; B32B2250/03; B32B2250/24; B32B2323/00; B32B2323/04; B32B2439/00; B32B2439/40; B32B2439/60
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
143 words
A process for manufacturing a thermoplastic polymer container having a triple-wall structure which comprises melt-extruding a composite plastic tube comprised of three closely adherent tubular laminates, the medial laminate being composed of a mixture of (i) 55 to 97% by weight of polyamide and (ii) 3 to 45% by weight of an ethylene copolymer containing 0.1 to 10% by mole, in polymerized form, of at least one compound selected from the group consisting of metal salts of acrylic acid and methacrylic acid, and the outer and inner laminates being composed of an olefin polymer, while the three independent streams of the polymer melts are joined together within a die such that the thickness of said medial laminate is 2 to 30% based on the total thickness of the three laminates; and then blow-molding the composite plastic tube into the shape of a container.
Claim 2
Dependent Claim
143 words
A process for manufacturing a thermoplastic polymer container having a triple-wall structure which comprises melt-extruding a composite plastic tube comprised of three closely adherent tubular laminates, the medial laminate being composed of a mixture of (i) 55 to 97% by weight of polyamide and (ii) 3 to 45% by weight of an ethylene copolymer containing 0.1 to 10% by mole, in polymerized form, of at least one compound selected from the group consisting of metal salts of acrylic acid and methacrylic acid, and the outer and inner laminates being composed of an olefin polymer, while the three independent streams of the polymer melts are joined together within a die such that the thickness of said medial laminate is 2 to 30% based on the total thickness of the three laminates; and then blow-molding the composite plastic tube into the shape of a container.
Claim 3
Dependent Claim
35 words
A process according to claim 1 wherein said medial laminate is comprised of a mixture of (i) 70 to 95% by weight of polyamide and (ii) 5 to 30% by weight of said ethylene copolymer.
Claim 4
Dependent Claim
22 words
A process according to claim 1 wherein said ethylene copolymer contains 0.1 to 10% by mole, in polymerized form, of zinc methacrylate.
Claim 5
Dependent Claim
26 words
A process according to claim 1 wherein the thickness of said medial laminate is 3 to 20% based on the total thickness of the three laminates.
Claim 6
Dependent Claim
18 words
A process according to claim 1 wherein said medial laminate has a thickness of more than 5 microns.
Claim 7
Dependent Claim
25 words
A process according to claim 1 wherein said olefin polymer to be formed into the outer and inner laminates is low or medium density polyethylene.
References Cited (Backward Citations)
US3457337A
Cited
US3819792A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |