Patent US4174413A successfully refreshed from Google Patents.
US4174413A
Expired / Lapsed
US
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Multi-layered molded articles
Assignee: Asahi Kasei Corp
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Filing: 1977-07-18
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Granted: 1979-11-13
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Expires: 1997-07-18
Abstract
Abstract A multi-layered article molded according to the present invention has in its cross-section a triple-layered structure consisting of two surface layers and a core layer interposed between said surface layers, said triple-layered structure being injection molded in a single shot from two kinds of thermoplastic synthetic resins to be formed into the surface and core layers, respectively, said core layer having a thickness less than one half of the entire thickness of said article.
Inventors
- 👤 Akio Yasuike
- 👤 Hiroshi Kataoka
- 👤 Norito Takao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:28
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/16; B29C45/1642; B29C45/1643; B29C45/1645; B29C51/00; B29C51/14; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B29C2949/00; B29C2949/30; B29C2949/3016; B29C2949/302; B29C2949/3024; B29C2949/3026; B29C2949/3028; B29C2949/303; B29C2949/3032; B29K; B29K2995/00; B29K2995/0037; B29K2995/0068; B29K2995/0069; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/1383; Y10T428/21; Y10T428/24; Y10T428/24942; Y10T428/2495
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
127 words
A multi-layered molded article having the shape of a vessel, closed-end parison, disk or the like, said article comprising in its cross-section a triple-layered structure consisting of two surface layers of different thicknesses and a core layer interposed between said surface layers, said triple-layered structure having been injection molded in a mold cavity in a single shot from two different kinds of thermoplastic synthetic resin to form said surface and core layers, respectively, said core layer having a thickness less than one half of the entire thickness of said article, said triple-layered structure having its crosssection represented by a+b<1/2(a+b+c) where a is the thickness of the core layer, b is the thickness of the thinner surface layer and c is the thickness of the thicker surface layer.
Claim 2
Dependent Claim
127 words
A multi-layered molded article having the shape of a vessel, closed-end parison, disk or the like, said article comprising in its cross-section a triple-layered structure consisting of two surface layers of different thicknesses and a core layer interposed between said surface layers, said triple-layered structure having been injection molded in a mold cavity in a single shot from two different kinds of thermoplastic synthetic resin to form said surface and core layers, respectively, said core layer having a thickness less than one half of the entire thickness of said article, said triple-layered structure having its crosssection represented by a+b<1/2(a+b+c) where a is the thickness of the core layer, b is the thickness of the thinner surface layer and c is the thickness of the thicker surface layer.
Claim 3
Dependent Claim
23 words
The multi-layered molded article as set forth in claim 1, wherein the value of (a+b+c) is less than or equal to 4 mm.
Claim 4
Dependent Claim
28 words
The multi-layered molded article as set forth in claim 1, wherein the value of a is less than 1 mm but greater than or equal to 0.05 mm.
Claim 5
Dependent Claim
32 words
The multi-layered molded article as set forth in claim 1, said article having been produced by first injection molding said synthetic resins into a cylindrical preform and subsequently blow molding said preform.
Claim 6
Dependent Claim
43 words
The mult-layered molded article as set forth in claim 1, said article having been produced by first of all injection molding said synthetic resins into a disk-like or sheet-shaped preform and subsequently forming said preform under vacuum or under vacuum and pressurized air.
Claim 7
Dependent Claim
24 words
The multi-layered molded article as set forth in claim 1, wherein the thermoplastic synthetic resin forming said core layer is a gas barrier resin.
Claim 8
Dependent Claim
46 words
The multi-layered molded article as set forth in claim 6, wherein said gas barrier resin is at least one member selected from the group consisting of a vinyl chloride-vinylidene chloride copolymer, saponified ethylene-vinyl acetate copolymer, nylon, and a acrylonitrile-styrene copolymer containing a major amount of acrylontrile.
Claim 9
Dependent Claim
59 words
The multi-layered molded article as set forth in claim 6, wherein said synthetic resin used to form said surface layers is a polyolefin, and said barrier resin is a blend containing a polyolefin as well as at least a saponified ethylene-vinyl acetate copolymer, the weight ratio of said polyolefin and saponified ethylene-vinyl acetate copolymer in said blend being 10-90:90-10.
Claim 10
Dependent Claim
80 words
The multi-layered molded article as set forth in claim 8, wherein said blend consists of a saponified ethylene-vinyl acetate copolymer, polyolefin and thermoplastic polymer in which carbonyl groups are present at a concentration of 120-1400 meq per 100 g of said polymer at its backbone chain or side chain, said polymer being present in the range of 0.5 to 15 parts by weight per 100 parts by weight of the total amount of said polyolefin and saponified ethylene-vinyl acetate copolymer.
Claim 11
Dependent Claim
24 words
The multi-layered molded article as set forth in claim 1, wherein the thermoplastic synthetic resin used to form said core layer has high-impact properties.
Claim 12
Dependent Claim
35 words
The multi-layered molded article as set forth in claim 10, wherein said high-impact synthetic resin is selected from the group consisting of a acrylonitrile-butadiene-styrene copolymer, acrylonitrile-styrene copolymer, high-impact polystyrene, polyethylene terephthalate, nylon, polyacetal and polycarbonate.
Claim 13
Dependent Claim
97 words
The multi-layered molded article as set forth in claim 1 wherein the value of (a+b+c) is less than or equal to 4 mm, the value of a is less than 1 mm but greater than or equal to 0.05 mm, the thermoplastic synthetic resin forming said core layer is a gas barrier resin including at least one member selected from the group consisting of a vinyl chloride-vinylidene chloride copolymer, saponified ethylene-vinyl acetate copolymer, nylon and an acrylonitrile-styrene copolymer containing a major amount of acrylonitrile, and the synthetic resin used to form the surface layers is a polyolefin.
Claim 14
Dependent Claim
47 words
The multi-layered molded article as set forth in claim 12 wherein said gas barrier resin is a blend containing a polyolefin as well as at least a saponified ethylene-vinyl acetate copolymer, the weight ratio of said polyolefin and saponified ethylene-vinyl acetate copolymer in said blend being 10-90:90-10.
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) | 1982-11-12 | 1983-05-14 | 1983-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-12 | 1987-05-14 | 1987-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-12 | 1991-05-14 | 1991-11-13 | $7700.00 | Window Closed / Lapsed |