US5153038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic multi-layer vessel
Assignee: Toyo Seikan Group Holdings Ltd
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Filing: 1989-04-27
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Granted: 1992-10-06
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Expires: 2009-04-27
Abstract
Abstract In a plastic multi-layer vessel, by forming a layer of a resin composition formed by incorporating an oxygen scavenger, optionally with a water-absorbing agent, in a gas barrier resin, a combination layer comprising a layer of a gas barrier thermoplastic resin and a layer of a resin composition formed by incorporating an oxygen scavenger in a moisture-absorbing thermoplastic resin, or a combination layer comprising a layer of a resin composition formed by incorporating an oxygen scavenger into a gas barrier resin and a layer of a resin composition formed by incorporating an water-absorbing agent into a thermoplastic resin, the resistance against the permeation of oxygen under heat sterilization conditions and after the heat sterilization can be highly improved, and the quantity of oxygen in the vessel can be controlled to a very low level.
Inventors
- 👤 Masayasu Koyama
- 👤 Yasuhiro Oda
- 👤 Muneki Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:13
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/18; B32B1/00; B32B2307/00; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2439/00; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1355; Y10T428/1359; Y10T428/1379; Y10T428/1383; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31928; Y10T428/31935
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
132 words
A plastic multi-layer vessel having a coextruded laminate structure comprising an intermediate layer of a resin composition formed by incorporating an oxygen scavenger into a gas barrier thermoplastic resin having an oxygen permeation coefficient smaller than 10 -12 cc.cm/cm 2 .sec.cmHg as measured at a temperature of 20° C. and a relative humidity of 0% and a water absorption larger than 0.5% as measured at a temperature of 20° C. and a relative humidity of 100%, said gas barrier thermoplastic resin being selected from the group consisting of an ethylene/vinyl alcohol copolymer having an ethylene content of 20 to 60 mole % and a polyamide having 5 to 50 amide groups per 100 carbon atoms of the polyamide, and moisture resistant thermoplastic resin layers arranged on both sides of said intermediate layer.
Claim 2
Dependent Claim
132 words
A plastic multi-layer vessel having a coextruded laminate structure comprising an intermediate layer of a resin composition formed by incorporating an oxygen scavenger into a gas barrier thermoplastic resin having an oxygen permeation coefficient smaller than 10 -12 cc.cm/cm 2 .sec.cmHg as measured at a temperature of 20° C. and a relative humidity of 0% and a water absorption larger than 0.5% as measured at a temperature of 20° C. and a relative humidity of 100%, said gas barrier thermoplastic resin being selected from the group consisting of an ethylene/vinyl alcohol copolymer having an ethylene content of 20 to 60 mole % and a polyamide having 5 to 50 amide groups per 100 carbon atoms of the polyamide, and moisture resistant thermoplastic resin layers arranged on both sides of said intermediate layer.
Claim 3
Dependent Claim
32 words
A multi-layer plastic vessel as set forth in claim 1, wherein the oxygen scavenger is present in an amount of 1 to 1000% by weight based on the gas barrier thermoplastic resin.
Claim 4
Dependent Claim
31 words
A multi-layer plastic vessel as set forth in claim 1, wherein the gas barrier thermoplastic resin is an ethylene/vinyl alcohol copolymer having an ethylene content of 20 to 60 mole %.
Claim 5
Dependent Claim
29 words
A multi-layer plastic vessel as set forth in claim 1, wherein the gas barrier thermoplastic resin is a polyamide having 5 to 50 amide groups per 100 carbon atoms.
Claim 6
Dependent Claim
45 words
A multi-layer plastic vessel as set forth in claim 1, wherein the oxygen scavenger is a powder of a metal having a reducing property, a compound of a metal having a reducing property or a high-molecular-weight compound having a polyhydric phenol in the skeleton thereof.
Claim 7
Dependent Claim
27 words
A multi-layer plastic vessel as set forth in claim 1, wherein the moisture-resistant thermoplastic resin is an olefin resin, a styrene resin, a polycarbonate or a polyester.
Claim 8
Dependent Claim
141 words
A plastic multi-layer vessel having a coextruded laminate structure comprising a first intermediate layer of a gas barrier thermoplastic resin having an oxygen permeation coefficient smaller than 10 -12 cc.cm/cm 2 .sec.cmHg as measured at a temperature of 20° C. and a relative humidity of 0%, said gas barrier thermoplastic resin being selected from the group consisting of an ethylene/vinyl alcohol copolymer having an ethylene content of 20 to 60 mole % and a polyamide having 5 to 50 amide groups per 100 carbon atoms in the polyamide, a second intermediate layer of a resin composition formed by incorporating an oxygen scavenger into a moisture-absorbing thermoplastic resin having a water absorption larger than 0.5% as measured at a temperature of 20° C. and a relative humidity of 100%, and moisture-resistant thermoplastic resin layers arranged on both sides of the intermediate layers.
Claim 9
Dependent Claim
141 words
A plastic multi-layer vessel having a coextruded laminate structure comprising a first intermediate layer of a gas barrier thermoplastic resin having an oxygen permeation coefficient smaller than 10 -12 cc.cm/cm 2 .sec.cmHg as measured at a temperature of 20° C. and a relative humidity of 0%, said gas barrier thermoplastic resin being selected from the group consisting of an ethylene/vinyl alcohol copolymer having an ethylene content of 20 to 60 mole % and a polyamide having 5 to 50 amide groups per 100 carbon atoms in the polyamide, a second intermediate layer of a resin composition formed by incorporating an oxygen scavenger into a moisture-absorbing thermoplastic resin having a water absorption larger than 0.5% as measured at a temperature of 20° C. and a relative humidity of 100%, and moisture-resistant thermoplastic resin layers arranged on both sides of the intermediate layers.
Claim 10
Dependent Claim
31 words
A multi-layer plastic vessel as set forth in claim 7, wherein the oxygen scavenger is present in an amount of 1 to 1000% by weight based on the moisture-absorbing thermoplastic resin.
Claim 11
Dependent Claim
31 words
A multi-layer plastic vessel as set forth in claim 7, wherein the gas barrier thermoplastic resin is an ethylene/vinyl alcohol copolymer having an ethylene content of 20 to 60 mole %.
Claim 12
Dependent Claim
29 words
A multi-layer plastic vessel as set forth in claim 7, wherein the gas barrier thermoplastic resin is a polyamide having 5 to 50 amide groups per 100 carbon atoms.
Claim 13
Dependent Claim
45 words
A multi-layer plastic vessel as set forth in claim 7, wherein the oxygen scavenger is a powder of a metal having a reducing property, a compound of a metal having a reducing property or a high-molecular-weight compound having a polyhydric phenol in the skeleton thereof.
Claim 14
Dependent Claim
27 words
A multi-layer plastic vessel as set forth in claim 7, wherein the moisture-resistant thermoplastic resin is an olefin resin, a styrene resin, a polycarbonate or a polyester.
Claim 15
Dependent Claim
130 words
A plastic multi-layer vessel comprising (A) a layer of a resin composition formed by incorporating an oxygen scavenger into a gas barrier thermoplastic resin having an oxygen permeation coefficient smaller than 10 -12 cc.cm/cm 2 .sec.cmHg as measured at a temperature of 20° C. and a relative humidity of 0% and a water absorption larger than 0.5% as measured at a temperature of 20° C. and a relative humidity of 100%, said gas barrier thermoplastic resin being selected from the group consisting of an ethylene/vinyl alcohol copolymer having an ethylene content of 20 to 60 mole % and a polyamide having 5 to 50 amide groups per 100 carbon atoms in the polyamide, and (B) a layer of resin composition formed by incorporating a water-absorbing agent into a thermoplastic resin.
Claim 16
Dependent Claim
130 words
A plastic multi-layer vessel comprising (A) a layer of a resin composition formed by incorporating an oxygen scavenger into a gas barrier thermoplastic resin having an oxygen permeation coefficient smaller than 10 -12 cc.cm/cm 2 .sec.cmHg as measured at a temperature of 20° C. and a relative humidity of 0% and a water absorption larger than 0.5% as measured at a temperature of 20° C. and a relative humidity of 100%, said gas barrier thermoplastic resin being selected from the group consisting of an ethylene/vinyl alcohol copolymer having an ethylene content of 20 to 60 mole % and a polyamide having 5 to 50 amide groups per 100 carbon atoms in the polyamide, and (B) a layer of resin composition formed by incorporating a water-absorbing agent into a thermoplastic resin.
Claim 17
Dependent Claim
51 words
A multi-layer vessel as set forth in claim 13, wherein the oxygen scavenger is present in an amount of 1 to 1000% by weight based on the gas barrier thermoplastic resin and the water-absorbing agent is present in an amount of 1 to 300% by weight based on the thermoplastic resin.
Claim 18
Dependent Claim
31 words
A multi-layer vessel as set forth in claim 13, wherein the layer (B) of the resin composition is present on both the sides of the layer (A) of the resin composition.
Claim 19
Dependent Claim
43 words
A multi-layer vessel as set forth in claim 13, which has a multi-layer structure in which the layer (A) of the resin composition and the layer (B) of the resin composition are sandwiched between inner and outer layers of a moisture-resistant thermoplastic resin.
Claim 20
Dependent Claim
30 words
A multi-layer vessel as set forth in claim 13, wherein the gas barrier thermoplastic resin is an ethylene/vinyl alcohol copolymer having an ethylene content of 20 to 60 mole %.
Claim 21
Dependent Claim
28 words
A multi-layer vessel as set forth in claim 13, wherein the gas barrier thermoplastic resin is a polyamide having 5 to 50 amide groups per 100 carbon atoms.
Claim 22
Dependent Claim
44 words
A multi-layer vessel as set forth in claim 13, wherein the oxygen scavenger is a powder of a metal having a reducing property, a compound of a metal having a reducing property or a high-molecular-weight compound having a polyhydric phenol in the skeleton thereof.
Claim 23
Dependent Claim
23 words
A multi-layer vessel as set forth in claim 13, wherein the water-absorbing agent is a deliquescent inorganic salt or a highly water-absorbing resin.
Claim 24
Dependent Claim
136 words
A plastic multi-layer vessel having a co-extruded laminate which comprises (1) an intermediate layer composed of a resin composition formed by incorporating an oxygen scavenger and a water-absorbing agent into a gas barrier resin having an oxygen permeation coefficient smaller than 10 -12 cc cm/cm 2 sec cmHg as measured at a temperature of 20° C. and a relative humidity of 0% and a water absorption larger than 0.5% as measured at a temperature of 20° C. and a relative humidity of 100%, said gas barrier resin being selected from the group consisting of an ethylene/vinyl alcohol copolymer having an ethylene content of 20 to 60 mole % and a polyamide having 5 to 20 amide groups per 100 carbon atoms, and (2) moisture-resistant thermoplastic resin layers arranged on both the sides of said intermediate layer.
Claim 25
Dependent Claim
136 words
A plastic multi-layer vessel having a co-extruded laminate which comprises (1) an intermediate layer composed of a resin composition formed by incorporating an oxygen scavenger and a water-absorbing agent into a gas barrier resin having an oxygen permeation coefficient smaller than 10 -12 cc cm/cm 2 sec cmHg as measured at a temperature of 20° C. and a relative humidity of 0% and a water absorption larger than 0.5% as measured at a temperature of 20° C. and a relative humidity of 100%, said gas barrier resin being selected from the group consisting of an ethylene/vinyl alcohol copolymer having an ethylene content of 20 to 60 mole % and a polyamide having 5 to 20 amide groups per 100 carbon atoms, and (2) moisture-resistant thermoplastic resin layers arranged on both the sides of said intermediate layer.
Claim 26
Dependent Claim
53 words
A multi-layer vessel as set forth in claim 21, wherein the oxygen scavenger is present in an amount of 1 to 1000% by weight based on the gas barrier thermoplastic resin and the water-absorbing agent is present in an amount of 1 to 300% by weight based on the gas barrier thermoplastic resin.
Claim 27
Dependent Claim
44 words
A multi-layer vessel as set forth in claim 21, wherein the oxygen scavenger is a powder of a metal having a reducing property, a compound of a metal having a reducing property or a high-molecular-weight compound having a polyhydric phenol in the shelton thereof.
Claim 28
Dependent Claim
23 words
A multi-layer vessel as set forth in claim 21, wherein the water-absorbing agent is a deliquescent inorganic salt or a highly water-absorbing 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) | 1995-10-06 | 1996-04-06 | 1996-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-06 | 2000-04-06 | 2000-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-06 | 2004-04-06 | 2004-10-06 | $7700.00 | Window Closed / Lapsed |