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EP0278403A2
Expired / Lapsed
EP
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Parison and blow-molded containers and processes for production thereof
Assignee: Mitsubishi Gas Chemical Co Inc
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Filing: 1988-02-04
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Granted: —
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Expires: 2008-02-04
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
- 👤 Shimizu Senzo
- 👤 Momose Yoshiaki
- 👤 Yoshida Yozo
- 👤 Ohta Takao
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 17:16
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: 25
Claim 1
Independent Claim
149 words
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.
Claim 2
Dependent Claim
149 words
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.
Claim 3
Dependent Claim
27 words
The parison of claim 1 wherein the volume ratio of the resin A to the resin B in the multilayered resin layer is from 1:40 to 40:1.
Claim 4
Dependent Claim
24 words
The parison of claim 1 wherein the thermoplastic resin A is a thermoplastic polyester resin having ethylene terephthalate recurring units as main recurring units.
Claim 5
Dependent Claim
17 words
The parison of claim 1 wherein the thermoplastic gas-barrier resin B is a m-xylylene group-containing polyamide resin.
Claim 6
Dependent Claim
14 words
The parison of claim 1 which is wholly composed of said multilayered resin layer.
Claim 7
Dependent Claim
54 words
The parison of claim 1 wherein at least the open end part of the mouth portion is composed of the resin A; an inside and an outside surface layer are each composed of the resin A and one interlayer located between the inside and outside surface layers is composed of the multilayered resin layer.
Claim 8
Dependent Claim
72 words
The parison of claim 1 wherein at least the open end part of the mouth portion is composed of the resin A; an inside and an outside surface layer and a middle layer are composed of the resin A; and one interlayers located between the inside surface layer and the middle layer and one interlayer located between the outside surface layer and the middle layer are composed of the multilayered resin layer.
Claim 9
Dependent Claim
141 words
A process for producing a parison as a precursor of a container by injection-molding at least a thermoplastic resin (resin A) and another thermoplastic resin having gas-barrier property (resin B) using an injection-molding machine, wherein a static mixing-stirring device is 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 an interlayer positioned between an outermost and an innermost layer composed of the resin A excepting at least the open end part of the mouth portion of the parison or the entire layers of the parison are formed by allowing the resins A and B to flow 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.
Claim 10
Dependent Claim
141 words
A process for producing a parison as a precursor of a container by injection-molding at least a thermoplastic resin (resin A) and another thermoplastic resin having gas-barrier property (resin B) using an injection-molding machine, wherein a static mixing-stirring device is 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 an interlayer positioned between an outermost and an innermost layer composed of the resin A excepting at least the open end part of the mouth portion of the parison or the entire layers of the parison are formed by allowing the resins A and B to flow 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.
Claim 11
Dependent Claim
161 words
A blow-molded container composed at least of a thermoplastic resin (resin A) and another thermoplastic resin having excellent gas-barrier property (resin B), said container being prepared by biaxially stretching and blow-molding a parison as a precursor of the container, said parison containing a multilayered resin layer at least in an intermediate layer between an outermost 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.
Claim 12
Dependent Claim
161 words
A blow-molded container composed at least of a thermoplastic resin (resin A) and another thermoplastic resin having excellent gas-barrier property (resin B), said container being prepared by biaxially stretching and blow-molding a parison as a precursor of the container, said parison containing a multilayered resin layer at least in an intermediate layer between an outermost 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.
Claim 13
Dependent Claim
27 words
The container of claim 9 wherein the volume ratio of the resin A to the resin B in the multilayered resin layer is from 1:40 to 40:1.
Claim 14
Dependent Claim
24 words
The container of claim 9 wherein the thermoplastic resin A is a thermoplastic polyester resin having ethylene terephthalate recurring units as main recurring units.
Claim 15
Dependent Claim
17 words
The container of claim 9 wherein the thermoplastic gas-barrier resin B is a m-xylylene group-containing polyamide resin.
Claim 16
Dependent Claim
14 words
The container of claim 9 which is wholly composed of said multilayered resin layer.
Claim 17
Dependent Claim
65 words
The container of claim 9 wherein at least the open end part of the mouth portion is composed of the resin A; an inside and an outside surface layer at the thin-walled part of the body portion and the bottom portion is composed of the resin A; and one interlayer located between the inside and outside surface layers is composed of the multilayered resin layer.
Claim 18
Dependent Claim
72 words
The container of claim 9 wherein at least the open end part of the mouth portion is composed of the resin A; an inside and an outside surface layer and a middle layer are composed of the resin A; and one interlayer located between the inside surface layer and the middle layer, and one interlayer located between the outside surface layer and the middle layer are composed of the multilayered resin layer.
Claim 19
Dependent Claim
164 words
A process for producing a container using at least a thermoplastic resin (resin A) and another thermoplastic resin having excellent gas-barrier property (resin B), which, comprises producing a parison by injection-molding said resins in 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 allowing the resins A and B to flow 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, thereby to form a multilayered resin layer composed of said resins A and B as an interlayer positioned between an outermost and an innermost layer composed of the resin A excepting at least the open end part of the mouth portion of the parison or as the entire layer of the parison, and biaxially stretching and blow-molding the parison.
Claim 20
Dependent Claim
164 words
A process for producing a container using at least a thermoplastic resin (resin A) and another thermoplastic resin having excellent gas-barrier property (resin B), which, comprises producing a parison by injection-molding said resins in 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 allowing the resins A and B to flow 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, thereby to form a multilayered resin layer composed of said resins A and B as an interlayer positioned between an outermost and an innermost layer composed of the resin A excepting at least the open end part of the mouth portion of the parison or as the entire layer of the parison, and biaxially stretching and blow-molding the parison.
Claim 21
Dependent Claim
126 words
A biaxially oriented multilayered container composed of a body portion and a mouth portion, at least the open end part of the mouth portion having a single structure composed of a thermoplastic resin (resin A), and at least the thin-walled part of the body portion being formed by alternately laminating at one or more layers of a mixture of resin A and another thermoplastic resin having gas-barrier property (resin B) and layers of resin A, the number of the resin A layers being larger than that of the mixed resin layers by one, wherein the total proportion of resin A particles and resin B particles having a long diameter of not more than 10 microns in said mixed resin layer is not more than 10 %.
Claim 22
Dependent Claim
126 words
A biaxially oriented multilayered container composed of a body portion and a mouth portion, at least the open end part of the mouth portion having a single structure composed of a thermoplastic resin (resin A), and at least the thin-walled part of the body portion being formed by alternately laminating at one or more layers of a mixture of resin A and another thermoplastic resin having gas-barrier property (resin B) and layers of resin A, the number of the resin A layers being larger than that of the mixed resin layers by one, wherein the total proportion of resin A particles and resin B particles having a long diameter of not more than 10 microns in said mixed resin layer is not more than 10 %.
Claim 23
Dependent Claim
21 words
The container of claim 17 wherein the resin A is a thermoplastic polyester resin, resin B is a m-xylylene group-containing polyamide.
Claim 24
Dependent Claim
26 words
The container of claim 17 wherein each said mixed resin layers composed of the resins A and B has a thickness of 10 to 300 microns.
Claim 25
Dependent Claim
21 words
The container of claim 17 wherein the thickwalled part of the body portion has a thickness of 200 to 3000 microns.
References Cited (Backward Citations)
No citation records indexed.
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