US4994313A
Expired / Lapsed
US
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Parison and blow-molded container and processes for production thereof
Assignee: Mitsubishi Gas Chemical Co Inc
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Filing: 1989-08-15
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Granted: 1991-02-19
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Expires: 2009-08-15
Abstract
Abstract A parison, as a precursor of a container, composed at least of a thermoplastic resin (resin A) and another thermoplastic resin having excellent gas-barrier property (resin B) and containing a multilayered resin layer at least in an intermediate layer between an outermost layer and an innermost layer each composed of resin A at parts other than the open end part of the mouth portion of the parison, or wholly in the parison, said multilayered resin layer being formed by using an injection-molding machine equipped with a static mixing-stirring device provided in a nozzle portion of an injection cylinder, or in a mold, or in a resin flow passage between the nozzle portion and a mold, and injecting the resins A and B through the static mixing-stirring device so that flows of the resins A and B are divided in a plurality of thin layers parallel to the flowing direction; and a process for production thereof. A container obtained by biaxially stretching and blow-molding the said parison has excellent transparency, gas-barrier property and mechanical strength.
Inventors
- 👤 Senzo Shimizu
- 👤 Yoshiaki Momose
- 👤 Yozo Yoshida
- 👤 Takao Ohta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:38
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B29; B29B; B29B11/00; B29B11/06; B29B11/08; B29C; B29C45/00; B29C45/16; B29C45/1642; B29C45/1643; B29C45/1646; B32B27/34; B32B27/36; B65; B65D; B65D1/00; B65D1/02; B65D1/0207; B65D1/0215; B29C49/00; B29C49/02; B29C2049/023; B29C2949/00; B29C2949/07; B29C2949/0715; B29C2949/072; B29C2949/0723; B29C2949/073; B29C2949/0732; B29C2949/076; B29C2949/0768; B29C2949/077; B29C2949/0772; B29C2949/0773; B29C2949/081; B29C2949/0811; B29C2949/082; B29C2949/0829; B29C2949/0861; B29C2949/0862; B29C2949/0872; B29C2949/20; B29C2949/22; B29C2949/24; B29C2949/30; B29C2949/3016; B29C2949/3018; B29C2949/302; B29C2949/3022; B29C2949/3024; B29C2949/3026; B29C2949/3028; B29C2949/303; B29C2949/3032; B29C2949/3034; B29C2949/3036; B29C2949/3038; B29C49/06; B29C49/071; B29K; B29K2105/00; B29K2105/25; B29K2105/253; B29K2105/258; B32B2250/00; B32B2250/24; B32B2307/00; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2367/00; B32B2377/00; B32B2439/00; B32B2439/40; B32B2439/60; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/1383; Y10T428/31504; Y10T428/31551; Y10T428/31573; Y10T428/31576; Y10T428/31725; Y10T428/31736; Y10T428/31786
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
243 words
A parison, as a precursor of a container, formed by using an injection-molding machine, comprising an open end part of a mouth portion composed of a thermoplastic resin (resin A), and parts other than the open end part of the mouth portion comprising an inside surface layer and an outside surface layer which are composed of the resin A, and an interlayer located between the inside surface layer and the outside surface layer, said interlayer being composed of the resin A and another thermoplastic resin having superior gas-barrier properties (resin B) with respect to resin A, said interlayer having a multi-layered structure comprising thin layers of the resin A and thin layers of the resin B laminated alternately in the radial direction of the parison wherein part of said thin layers of the resin A and part of said thin layers of the resin B are discontinuous in the circumferential direction and/or the axial direction of the parison, and being formed by injecting the resin A and the resin B through a static mixing-stirring device, which is provided in a nozzle portion of an injection cylinder, or in a mold, or in a resin flow passage between the nozzle portion of the injection cylinder and the mold, so that flows of the resin A and the resin B are divided in a plurality of thin layers of the resin A and thin layers of the resin B parallel to the flowing direction thereof.
Claim 2
Dependent Claim
243 words
A parison, as a precursor of a container, formed by using an injection-molding machine, comprising an open end part of a mouth portion composed of a thermoplastic resin (resin A), and parts other than the open end part of the mouth portion comprising an inside surface layer and an outside surface layer which are composed of the resin A, and an interlayer located between the inside surface layer and the outside surface layer, said interlayer being composed of the resin A and another thermoplastic resin having superior gas-barrier properties (resin B) with respect to resin A, said interlayer having a multi-layered structure comprising thin layers of the resin A and thin layers of the resin B laminated alternately in the radial direction of the parison wherein part of said thin layers of the resin A and part of said thin layers of the resin B are discontinuous in the circumferential direction and/or the axial direction of the parison, and being formed by injecting the resin A and the resin B through a static mixing-stirring device, which is provided in a nozzle portion of an injection cylinder, or in a mold, or in a resin flow passage between the nozzle portion of the injection cylinder and the mold, so that flows of the resin A and the resin B are divided in a plurality of thin layers of the resin A and thin layers of the resin B parallel to the flowing direction thereof.
Claim 3
Dependent Claim
25 words
The parison of claim 1 wherein the volume ratio of the resin A to the resin B in said interlayer is from 1:40 to 40:1.
Claim 4
Dependent Claim
23 words
The parison of claim 1 wherein the resin A is a thermoplastic polyester resin having ethylene therphthalate recurring units as main recurring units.
Claim 5
Dependent Claim
15 words
The parison of claim 1 wherein the resin B is a m-xylylene group-containing polyamide resin.
Claim 6
Dependent Claim
267 words
A parison, as a precursor of a container, formed by using an injection-molding machine, comprising an open end part of a mouth portion composed of a thermoplastic resin (resin A) and parts other than the open end part of the mouth portion comprising an inside surface layer, a middle layer and an outside surface layer which are composed of the resin A, and two interlayers, one of which is located between the inside surface layer and the middle layer and the other of which is located between the middle layer and the outside surface layer, said each interlayer being composed of the resin A and another thermoplastic resin having superior gas-barrier properties (resin B) with respect to resin A, said each interlayer having a multi-layered structure comprising thin layers of the resin A and thin layers of the resin B laminated alternately in the radial direction of the parison wherein part of said thin layers of the resin A and part of said thin layers of the resin B are discontinuous in the circumferential direction and/or the axial direction of the parison, and being formed by injecting the resin A and the resin B through a static mixing-stirring device, which is provided in a nozzle portion of an injection cylinder, or in a mold, or in a resin flow passage between the nozzle portion of the injection cylinder and the mold, so that flows of the resin A and the resin B are divided in a plurality of thin layers of the resin A and thin layers of the resin B parallel to the flowing direction thereof.
Claim 7
Dependent Claim
267 words
A parison, as a precursor of a container, formed by using an injection-molding machine, comprising an open end part of a mouth portion composed of a thermoplastic resin (resin A) and parts other than the open end part of the mouth portion comprising an inside surface layer, a middle layer and an outside surface layer which are composed of the resin A, and two interlayers, one of which is located between the inside surface layer and the middle layer and the other of which is located between the middle layer and the outside surface layer, said each interlayer being composed of the resin A and another thermoplastic resin having superior gas-barrier properties (resin B) with respect to resin A, said each interlayer having a multi-layered structure comprising thin layers of the resin A and thin layers of the resin B laminated alternately in the radial direction of the parison wherein part of said thin layers of the resin A and part of said thin layers of the resin B are discontinuous in the circumferential direction and/or the axial direction of the parison, and being formed by injecting the resin A and the resin B through a static mixing-stirring device, which is provided in a nozzle portion of an injection cylinder, or in a mold, or in a resin flow passage between the nozzle portion of the injection cylinder and the mold, so that flows of the resin A and the resin B are divided in a plurality of thin layers of the resin A and thin layers of the resin B parallel to the flowing direction thereof.
Claim 8
Dependent Claim
26 words
The parison of claim 5 wherein the volume ratio of the resin A to the resin B in said each interlayer is from 1:40 to 40:1.
Claim 9
Dependent Claim
23 words
The parison of claim 5 wherein the resin A is a thermoplastic polyester resin having ethylene terephthalate recurring units as main recurring units.
Claim 10
Dependent Claim
15 words
The parison of claim 5 wherein the resin B is a m-xylylene group-containing polyamide resin.
Claim 11
Dependent Claim
257 words
A blow-molded container formed by biaxilly stretching and blow-molding a parison as a precursor of a container, said parison being formed by using an injection-molding machine and said parison comprising an open end part of a mouth portion composed of a thermoplastic resin (resin A), and parts other than the open end part of the mouth portion comprising an inside surface layer and an outside surface layer which are composed of the resin A, and an interlayer located between the inside surface layer and the outside surface layer, said interlayer being composed of the resin A and another thermoplastic resin having superior gas-barrier properties (resin B) with respect to resin A, said interlayer having multi-layered structure comprising thin layers of the resin A and thin layers of the resin B laminated alternately in the radial direction of the parison wherein part of said thin layers of the resin A and part of said thin layers of the resin B are discontinuous in the circumferential direction and/or the axial direction of the parison, and being formed by injecting the resin A and the resin B through a static mixing-stirring device, which is provided in a nozzle portion of an injection cylinder, or in a mold, or in a resin flow passage between the nozzle portion of the injection cylinder and the mold, so that flows of the resin A and the resin B are divided in a plurality of thin layers of the resin A and thin layers of the resin B parallel to the flowing direction thereof.
Claim 12
Dependent Claim
257 words
A blow-molded container formed by biaxilly stretching and blow-molding a parison as a precursor of a container, said parison being formed by using an injection-molding machine and said parison comprising an open end part of a mouth portion composed of a thermoplastic resin (resin A), and parts other than the open end part of the mouth portion comprising an inside surface layer and an outside surface layer which are composed of the resin A, and an interlayer located between the inside surface layer and the outside surface layer, said interlayer being composed of the resin A and another thermoplastic resin having superior gas-barrier properties (resin B) with respect to resin A, said interlayer having multi-layered structure comprising thin layers of the resin A and thin layers of the resin B laminated alternately in the radial direction of the parison wherein part of said thin layers of the resin A and part of said thin layers of the resin B are discontinuous in the circumferential direction and/or the axial direction of the parison, and being formed by injecting the resin A and the resin B through a static mixing-stirring device, which is provided in a nozzle portion of an injection cylinder, or in a mold, or in a resin flow passage between the nozzle portion of the injection cylinder and the mold, so that flows of the resin A and the resin B are divided in a plurality of thin layers of the resin A and thin layers of the resin B parallel to the flowing direction thereof.
Claim 13
Dependent Claim
26 words
The blow-molded container of claim 5 wherein the volume ratio of the resin A to the resin B in said interlayer is from 1:40 to 40:1.
Claim 14
Dependent Claim
24 words
The blow-molded container of claim 9 wherein the resin A is a thermoplastic polyester resin having ethylene terephthalate recurring units as main recurring units.
Claim 15
Dependent Claim
16 words
The blow-molded container of claim 9 wherein the resin B is a m-xylylene group-containing polyamide resin.
Claim 16
Dependent Claim
282 words
A blow-molded container formed by biaxially stretching and blow-molding a parison as a precursor of a container, said parison being formed by using an injection-molding machine and said parison comprising an open end part of a mouth portion composed of a thermoplastic resin (resin A), and parts other than the open and part of the mouth portion comprising an inside surface layer, a middle layers and an outside surface layer which are composed of the resin A, and two interlayers, one of which is located between the inside surface layers and the middle layer and the other of which is located between the middle layer and the outside surface layer, said each interlayer being composed of the resin A and another thermoplastic resin having superior gas-barrier properties (resin B) with respect to resin A, said each interlayer having a multi-layered structure comprising thin layers of the resin A and thin layers of the resin B laminated alternately in the radial direction of the parison wherein part of said thin layers of the resin A and part of said think layers of the resin B are discontinuous in the circumferential direction and/or the axial direction of the parison, and being formed by injecting the resin A and the resin B through a static mixing-stirring device, which is provided in a nozzle portion of an injection cylinder, or in a mold, or in a resin flow passage between the nozzle portion of the injection cylinder and the mold, so that flows of the resin A and the resin B are divided in a plurality of thin layers of the resin A and thin layers of the resin B parallel to the flowing direction thereof.
Claim 17
Dependent Claim
282 words
A blow-molded container formed by biaxially stretching and blow-molding a parison as a precursor of a container, said parison being formed by using an injection-molding machine and said parison comprising an open end part of a mouth portion composed of a thermoplastic resin (resin A), and parts other than the open and part of the mouth portion comprising an inside surface layer, a middle layers and an outside surface layer which are composed of the resin A, and two interlayers, one of which is located between the inside surface layers and the middle layer and the other of which is located between the middle layer and the outside surface layer, said each interlayer being composed of the resin A and another thermoplastic resin having superior gas-barrier properties (resin B) with respect to resin A, said each interlayer having a multi-layered structure comprising thin layers of the resin A and thin layers of the resin B laminated alternately in the radial direction of the parison wherein part of said thin layers of the resin A and part of said think layers of the resin B are discontinuous in the circumferential direction and/or the axial direction of the parison, and being formed by injecting the resin A and the resin B through a static mixing-stirring device, which is provided in a nozzle portion of an injection cylinder, or in a mold, or in a resin flow passage between the nozzle portion of the injection cylinder and the mold, so that flows of the resin A and the resin B are divided in a plurality of thin layers of the resin A and thin layers of the resin B parallel to the flowing direction thereof.
Claim 18
Dependent Claim
27 words
The blow-molded container of claim 13 wherein the volume ratio of the resin A to the resin B in said each interlayers is from 1:40 to 40:1.
Claim 19
Dependent Claim
24 words
The blow-molded container of claim 13 wherein the resin A is a thermoplastic polyester resin having ethylene terephthalate recurring units as main recurring units.
Claim 20
Dependent Claim
16 words
The blow-molded container of claim 13 wherein the resin B is a m-xylylene group-containing polyamide resin.
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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) | 1994-02-18 | 1994-08-20 | 1995-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-18 | 1998-08-20 | 1999-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-18 | 2002-08-20 | 2003-02-19 | $7700.00 | Window Closed / Lapsed |