US4904512A
Expired / Lapsed
US
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Compression-molded article having multilayer structure
Assignee: Toyo Seikan Group Holdings Ltd
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Filing: 1987-02-02
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Granted: 1990-02-27
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Expires: 2007-02-02
Abstract
Abstract A multilayer compression-molded article produced by compression-molding a composite plastic material. The composite plastic material comprises a first synthetic resin and a second synthetic resin in which the first synthetic resin surrounds substantially the entire second synthetic resin. The compression-molded article comprises a first resin layer molded from the first synthetic resin and a second resin layer molded from the second synthetic resin in which the first resin layer surrounds substantially the entire second resin layer. The composite plastic material is obtained by an extrusion apparatus which intermittently extrudes the second synthetic resin via a subsidiary extrusion flow passage into a main extrusion flow passage in which the first synthetic resin flows.
Inventors
- 👤 Muneki Yamada
- 👤 Kiyoshi Kawaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:20
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/32; B29C43/34; B29B; B29B11/00; B29B11/06; B29B11/10; B29B11/14; B29C43/02; B29C43/20; B29C43/203; B29C48/00; B29C48/03; B29C48/09; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/30; B29C48/304; B29C48/36; B29C48/49; B29C49/00; B29C49/071; B29D; B29D22/00; B29D22/003; B29C2043/3433; B29C2949/00; B29C2949/07; B29C2949/0715; B29C48/07; B29C48/12; B29K; B29K2995/00; B29K2995/0037; B29K2995/0065; B29K2995/0067; B29L; B29L2031/00; B29L2031/56; B29L2031/565; B29L2031/712; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/1383; Y10T428/31504; Y10T428/31507; Y10T428/31725; Y10T428/31736; Y10T428/31739; Y10T428/31743; Y10T428/31746; Y10T428/3175; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
119 words
A compression-molded article having a multilayer structure comprising a first resin layer molded from a first synthetic resin and a second resin layer molded from a second synthetic resin, said first and second synthetic resins being dissimilar, said first resin layer completely surrounding the entire second resin layer, said article being produced by compression-molding of a heat-molten composite plastic material formed by intermittently extruding the second synthetic resin, in molten condition, into a main extrusion flow path for the first synthetic resin whereby the first resin, in molten condition, completely surrounds the second resin, and thereafter extruding the composite plastic through an extrusion opening in the main extrusion flow passage with the first resin completely surrounding the second resin.
Claim 2
Dependent Claim
119 words
A compression-molded article having a multilayer structure comprising a first resin layer molded from a first synthetic resin and a second resin layer molded from a second synthetic resin, said first and second synthetic resins being dissimilar, said first resin layer completely surrounding the entire second resin layer, said article being produced by compression-molding of a heat-molten composite plastic material formed by intermittently extruding the second synthetic resin, in molten condition, into a main extrusion flow path for the first synthetic resin whereby the first resin, in molten condition, completely surrounds the second resin, and thereafter extruding the composite plastic through an extrusion opening in the main extrusion flow passage with the first resin completely surrounding the second resin.
Claim 3
Dependent Claim
31 words
The compression-molded article of claim 1 wherein the first synthetic resin is an olefinic resin, a styrene-type resin, an acrylic resin, a methacrylic resin, a polyester-type resin or a polycarbonate resin.
Claim 4
Dependent Claim
35 words
The compression-molded article of claim 2 wherein the second synthetic resin is an olefin/vinyl alcohol copolymer, a polyamide resin, a high-barrier polyester-type resin, a nitrile-type resin, a vinyl chloride-type resin or a vinylidene chloride-type resin.
Claim 5
Dependent Claim
33 words
The compression-molded article of claim 1 wherein the first synthetic resin is an olefinic resin, and the second synthetic resin is an ethylene/vinyl alcohol copolymer, nylon 6/6.6 copolymer or a vinylidene chloride resin.
Claim 6
Dependent Claim
18 words
The compression-molded article of claim 1 which is a container closure, a container closure liner, or a container.
Claim 7
Dependent Claim
30 words
The compression-molded article of claim 1 wherein the first synthetic resin is a relatively low barrier to gases and the second synthetic resin is a relatively high barrier to gases.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-26 | 1993-08-28 | 1994-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-26 | 1997-08-28 | 1998-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-26 | 2001-08-28 | 2002-02-27 | $7700.00 | Window Closed / Lapsed |