US5346950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resin composition
Assignee: Idemitsu Petrochemical Co Ltd
•
Filing: 1993-10-25
•
Granted: 1994-09-13
•
Expires: 2013-10-25
Abstract
Abstract 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 degree of saponification of at least 90% and 95 to 5 parts by weight of a styrene-based polymer (B) having mainly syndiotactic configuration. The resin composition has gas barrier properties and a markedly improved heat resistance.
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 06:21
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: 12
Claim 1
Independent Claim
58 words
A resin composition comprising a blend of 5 to 95 parts by weight of (A) 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 95 to 5 parts by weight of (B) a styrene-based polymer having mainly syndiotactic configuration.
Claim 2
Dependent Claim
58 words
A resin composition comprising a blend of 5 to 95 parts by weight of (A) 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 95 to 5 parts by weight of (B) a styrene-based polymer having mainly syndiotactic configuration.
Claim 3
Dependent Claim
43 words
The resin composition of claim 1, 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 4
Dependent Claim
57 words
The resin composition of claim 2, wherein (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 5
Dependent Claim
48 words
The resin composition of claim 2, wherein (B) is a styrene-based polymer 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 weight average molecular weight of at least 10,000.
Claim 6
Dependent Claim
71 words
The resin composition of claim 3, wherein the weight ratio of (A) to (B) is 7:93 to 70:30, the styrene-based polymer has a crystallinity of at least 35% and a weight average 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 7
Dependent Claim
65 words
The resin composition of claim 3, wherein the saponified product of the 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 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 8
Dependent Claim
13 words
The resin composition of claim 5, wherein said styrene-based polymer is syndiotactic polystyrene.
Claim 9
Dependent Claim
13 words
The resin composition of claim 6, wherein said styrene-based polymer is syndiotactic polystyrene.
Claim 10
Dependent Claim
26 words
The resin composition of claim 1, wherein the ethylene-vinyl acetate copolymer has an ethylene content of 32 mol % and a degree of saponification of 99.4%.
Claim 11
Dependent Claim
28 words
The resin composition of claim 1, wherein a 20 μm film of said resin composition has an oxygen permeation speed PO 2 of 0.3-150 cc.20 μm/m 2 .day.atm.
Claim 12
Dependent Claim
19 words
The resin composition of claim 10, wherein said oxygen permeation speed PO 2 is 0.3-1.9 cc.20 μm/m 2 .day.atm.
References Cited (Backward Citations)
US3949114A
Cited
JPS5075239A
Cited
JPS5446281A
Cited
JPS6026072A
Cited
JPS60107337A
Cited
EP0210615A2
Cited
JPS62104818A
Cited
JPS62187708A
Cited
JPS62257948A
Cited
JPS62257950A
Cited
JPS6377905A
Cited
US4883696A
Cited
EP0324398A1
Cited
EP0337316A1
Cited
US5004649A
Cited
US5071917A
Cited
US5169893A
Cited
US5089353A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-09-12 | 1998-03-14 | 1998-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-12 | 2002-03-14 | 2002-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-12 | 2006-03-14 | 2006-09-13 | $7700.00 | Window Closed / Lapsed |