US5089353A
Expired / Lapsed
US
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Multi-layer material having gas barrier properties
Assignee: Idemitsu Petrochemical Co Ltd
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Filing: 1989-09-28
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Granted: 1992-02-18
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Expires: 2009-09-28
Abstract
Abstract A multi-layer material with a layer (A) of a saponified product of an ethylene-vinyl acetate copolymer having an ethylene content of 20 to 60 mol % and a degree of saponification of at least 90% and a layer (B) of a styrene-based polymer having mainly syndiotactic configuration, or a resin composition comprising 5 to 95 parts by weight of a saponified product of an ethylene-vinyl acetate copolymer (A) having an ethylene content of 20 to 60 mol % and a degreee of saponification of at least 90% and 95 to 5 parts by weight of a styrene-based polymer (B) having mainly syndiotactic configuration has gas barrier properties and markedly improved heat resistance. In a molding comprising the resin composition or the multi-layer material, contents (food) can be stored for a long period of time at ambient temperature. Moreover, after retort sterilization, the container can be heated by boiling, or in a microwave oven or a grill oven (at 220 to 240° C.) in the condition that the contents (food) are placed in the container.
Inventors
- 👤 Taichi Negi
- 👤 Akira Mochizuki
- 👤 Shiro Nagata
- 👤 Komei Yamasaki
- 👤 Keisuke Funaki
- 👤 Takashi Sumitomo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:18
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/18; B32B27/30; B32B27/302; B32B27/306; B32B37/00; B32B37/14; B32B37/15; B32B37/153; B32B7/00; B32B7/04; B32B7/12; B65; B65D; B65D81/00; B65D81/34; C; C08; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/06; C08L29/00; C08L29/02; C08L29/04; B32B38/00; B32B38/0012; B32B2038/0028; B32B2307/00; B32B2307/30; B32B2307/306; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2325/00; B32B2331/00; B32B2331/04; C08L23/00; C08L23/26; C08L23/28; Y; Y10; Y10S; Y10S264/00; Y10S264/33; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/1341; Y10T428/1352; Y10T428/1379; Y10T428/1383; Y10T428/31504; Y10T428/31507; Y10T428/31725; Y10T428/3175; Y10T428/31757; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
64 words
A multi-layer material comprising at least one layer (A) of a first saponified product of an ethylene-vinyl acetate copolymer having an ethylene content of 20 to 60 mol % and a degree of saponification of at least 90% and at least one layer (B) of a styrene-based polymer having a syndiotactic configuration such that the proportion in a racemic pentad is at least 35%.
Claim 2
Dependent Claim
64 words
A multi-layer material comprising at least one layer (A) of a first saponified product of an ethylene-vinyl acetate copolymer having an ethylene content of 20 to 60 mol % and a degree of saponification of at least 90% and at least one layer (B) of a styrene-based polymer having a syndiotactic configuration such that the proportion in a racemic pentad is at least 35%.
Claim 3
Dependent Claim
27 words
The multi-layer material as defined in claim 1, wherein there are at least two layers (B) and the layer (A) is disposed between two layers of (B).
Claim 4
Dependent Claim
26 words
The multi-layer material as defined in claim 2, wherein a layer (C) of an adhesive resin is disposed between the layer (A) and the layer (B).
Claim 5
Dependent Claim
25 words
The multi-layer material as defined in claim 1, further comprising layer (C) of an adhesive resin sandwiched between the layer (A) and the layer (B).
Claim 6
Dependent Claim
82 words
The multi-layer material as defined in claim 4, wherein the adhesive resin is an acid anhydride-modified product of an oelfin or a diene-based polymer and said adhesive resin is selected from the group consisting of a polymer from graft polymerization of an unsaturated carboxylic acid or its anhydride to an olefin-based polymer or copolymer; an acid anhydride modified product of a hydrogenated styrene-butadiene copolymer; an acid anhydride modified product of liquid butanediene and an acid anhydride modified product of an ethylene-propylene-diene copolymer.
Claim 7
Dependent Claim
62 words
The multi-layer material as defined in claim 4, wherein the adhesive resin is a polymer from graft polymerization of an unsaturated carboxylic acid to a polymer or copolymer selected from the group consisting of low density polyethylene, linear low density polyethylene, super low density polyethylene, an ethylene-vinyl acetate copolymer, an ethylene-(meth)acrylic acid copolymer, an ethylene-(meth)acrylic methyl ester and an ethylene-(meth)acrylic ethyl ester.
Claim 8
Dependent Claim
82 words
The multi-layer material as defined in claim 4, wherein the saponified product of an ethylene-vinyl acetate copolymer has a ethylene content of 44 mol %, a degree of saponification of 99.4% and a melting index of 5.5 g/10 minutes; the adhesive resin is maleic anhydride-modified super low density polyethylene and the styrene-based polymer is syndiotactic polystyrene which has a syndiotactic configuration such that the proportion in a racemic pentad is 96% and the styrene-based polymer has a melting point of 268° C.
Claim 9
Dependent Claim
57 words
A multi-layer material as defined in claim 1, wherein the layer (B) is a resin composition layer containing a second saponified product of an ethylene-vinyl acetate copolymer having an ethylene content of 20 to 60 mol % and a degree of saponification of at least 90%, or said second saponified product having an adhesive resin disposed thereon.
Claim 10
Dependent Claim
24 words
The multi-layer material as defined in claim 1, wherein a resin composition layer containing (A) and (B), or (A), (B) and (C) was interposed.
Claim 11
Dependent Claim
15 words
A multi-layer material as defined in claim 1, wherein said material is formed by coextrusion.
Claim 12
Dependent Claim
13 words
A multi-layer material as defined in claim 1, wherein said material is stretched.
Claim 13
Dependent Claim
21 words
The multi-layer material as defined 1, wherein the styrene-based polymer as the layer (B) has a crystallinity of at least 30%.
Claim 14
Dependent Claim
21 words
The multi-layer material as defined 1, wherein the styrene-based polymer as the layer (B) has a crystallinity of at least 30%.
Claim 15
Dependent Claim
24 words
The multi-layer material as defined in claim 12, wherein the weight ratio of said layer (A) to said layer (B) is 5/95 to 95/5.
Claim 16
Dependent Claim
45 words
The multi-layer material as defined in claim 13, wherein the saponified product of the ethylene-vinyl acetate copolymer has an ethylene content of 25 to 50 mol %, a degree of saponification of at least 95% and a melt index of 0.1 to 50 g/10 minutes.
Claim 17
Dependent Claim
61 words
The multi-layer material as defined in claim 1, wherein the layer (B) is a styrene-based polymer having a syndiotactic configuration such that the proportion of structural units continuously connected to each other in a racemic pentad is at least 35%, said styrene-based polymer is a polymer selected from the group consisting of polystyrene, poly(alkylstyrene), poly(halogenated styrene), poly(alkoxystyrene), poly(vinylbenzoate), and mixtures thereof.
Claim 18
Dependent Claim
47 words
The multi-layer material as defined in claim 15, wherein said styrene-based polymer is selected from the group consisting of polystyrene, polymethylstyrene, polyethylstyrene, polyisopropylstyrene, poly(tert-butylstyrene), polychlorostyrene, polybromostyrene, polymethoxystyrene, polyethoxystyrene and a copolymer of styrene and paramethylstyrene, and said styrene-based polymer has a molecular weight of at least 10,000.
Claim 19
Dependent Claim
75 words
The multi-layer material as defined in claim 15, wherein the weight ratio of said layer (A) to said layer (B) is 7:93 to 70:30; the styrene-based polymer has a crystallinity of at least 35% and a molecular weight of 50,000 to 3,000,000; and the ethylene-vinyl acetate copolymer has an ethylene content of 25 to 50 mol %, a degree of saponification of at least 95% and a melt index of 0.5 to 20 g/10 minutes.
Claim 20
Dependent Claim
15 words
The multi-layer material as defined in claim 17, wherein said styrene-based polymer is syndiotactic polystyrene.
Claim 21
Dependent Claim
39 words
The multi-layer material as defined in claim 18, wherein the material has a structure selected from the group consisting of layer (A)/layer (B); layer (B)/layer (A)/layer (B); layer (A)/layer (B)/layer (A)/layer (B); and layer (B)/layer (A)/layer (B)/layer (A)/layer (B).
Claim 22
Dependent Claim
86 words
The multi-layer material as defined in claim 19, having a layer (C) of an adhesive resin sandwiched between the layer (A) and the layer (B); and wherein the saponified product of an ethylene-vinyl acetate copolymer has a ethylene content of 44 mol %, a degree of saponification of 99.4% and a melting index of 5.5 g/10 minutes; the adhesive resin is maleic anhydride-modified super low density polyethylene and said polystyrene has a melting point of 268° C. and said weight ratio is from 10:90 to 50:50.
Claim 23
Dependent Claim
96 words
The multi-layer material as defined in claim 19, having a layer (C) of an adhesive resin sandwiched between the layer (A) and the layer (B); wherein the saponified product of an ethylenevinyl acetate copolymer has an ethylene content of 32 mol %, a degree of saponification of 99.4% and a melt index of 1.3 g/10 minutes; the adhesive resin is a maleic anhydride-modified super low density and said polystyrene has a proportion of configuration in a racemic pentad of 96% and a melting point of 268° C. and said weight ratio is from 10:90 to 50:50.
Claim 24
Dependent Claim
149 words
The multi-layer as defined in claim 19, having a layer (C) of an adhesive resin sandwiched between the layer (A) and the layer (B); wherein the weight ratio of (A) to (B) is 10:90 to 50:50; wherein the saponified product of the ethylene vinyl acetate copolymer has an ethylene content of 25 to 50 mol %, a degree of saponification of at least 95% and a melt index of 0.1 to 50 g/10 minutes; and wherein the adhesive resin is an acid anhydride-modified product of an olefin or a diene-based polymer and said adhesive resin is selected from the group consisting of a polymer from graft polymerization of an unsaturated carboxylic acid or its anhydride to an olefin-based polymer or copolymer; an acid anhydride modified product of a hydrogenated styrenebutadiene copolymer; an acid anhydride modified product of liquid butanediene and an acid anhydride modified product of an ethylene-propylene-diene copolymer.
Claim 25
Dependent Claim
128 words
The multi-layer as defined in claim 19, having a layer (C) of an adhesive resin sandwiched between the layer (A) and the layer (B); wherein the weight ratio of (A) to (B) is 10:90 to 50:50; wherein the saponified product of the ethylene-vinyl acetate copolymer has an ethylene content of 25 to 50 mol %, a degree of saponification of at least 95% and a melt index of 0.1 to 50 g/10 minutes; and wherein the adhesive resin is a polymer from graft polymerization of an unsaturated carboxylic acid to a polymer or copolymer selected from the group consisting of low density polyethylene, linear low density polyethylene, super low density polyethylene, an ethylene-vinyl acetate copolymer, an ethylene-(meth)acrylic acid copolymer, an ethylene-(meth)acrylic methyl ester and an ethylene-(meth)acrylic ethyl ester.
Claim 26
Dependent Claim
79 words
The multi-layer material as defined in claim 15, wherein the saponified product of an ethylene-vinyl acetate copolymer has an ethylene content of 32 mol %, a degree of saponification of 99.4% and a melt index of 1.3 g/10 minutes; the adhesive resin is a maleic anhydride-modified super low density polyethylene; and the styrene-based polymer has a syndiotactic configuration such that the proportion in a racemic pentad is 96% and the styrene-based polymer has a melting point of 268° C.
Claim 27
Dependent Claim
39 words
The multi-layer material as defined in claim 15, wherein the material has a structure selected from the group consisting of layer (A)/layer (B); layer (B)/layer (A)/layer (B); layer (A)/layer (B)/layer (A)/layer (B); and layer (B)/layer (A)/layer (B)/layer (A)/layer (B).
Claim 28
Dependent Claim
28 words
The multi-layer material as defined in claim 1, wherein the ethylene-vinyl acetate copolymer has an ethylene content of 32 mol % and a degree of saponification of 99.4%.
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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) | 1995-02-17 | 1995-08-19 | 1996-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-17 | 1999-08-19 | 2000-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-17 | 2003-08-19 | 2004-02-18 | $7700.00 | Window Closed / Lapsed |