US4904509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection-molded body of olefin/vinyl alcohol copolymer and process for preparation thereof
Assignee: Toyo Seikan Group Holdings Ltd
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Filing: 1988-11-09
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Granted: 1990-02-27
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Expires: 2008-11-09
Abstract
Abstract An injection-molded body comprising a layer of an olefin/vinyl alcohol copolymer having a very high molecular weight is obtained by melt-kneading a composition comprising (i) a high-molecular-weight olefin/vinyl alcohol copolymer having a melt flow rate of 0.4 to 6.0 g/10 min as determined at 190° C. and a vinyl alcohol content of 40 to 80 mole % and (ii) a low-molecular-weight olefin/vinyl alcohol copolymer having a melt flow rate of 3.0 to 60 g/10 min as determined at 190° C., which is higher by at least 0.5 g/10 min than that of the high-molecular-weight ethylene/vinyl alcohol copolymer (i), and a vinyl alcohol content of 45 to 85 mole % at a weight ratio of from 98/2 to 40/60, and injecting the melt-kneaded composition into a mold through an orifice.
Inventors
- 👤 Shigezo Nohara
- 👤 Sadao Hirata
- 👤 Junichi Matsuo
- 👤 Masami Hirano
- 👤 Isao Tanikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:51
CPC Classifications
B; B29; B29C; B29C67/00; B29C67/24; B29C45/00; B29C45/0001; C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L29/00; C08L29/02; C08L29/04; B29K; B29K2023/00; B29K2023/04; B29K2023/08; B29K2023/086; B29K2105/00; B29K2105/0085; B29K2995/00; B29K2995/0037; B29K2995/0088; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/31504; Y10T428/31855; Y10T428/31935
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
30 words
An injection-molded body which comprises an ethylene/vinyl alcohol copolymer having a weight average molecular weight (Mw) of at least 80,000 and a molecular weight distribution (Mw/Mn) of at least 2.1.
Claim 2
Dependent Claim
30 words
An injection-molded body which comprises an ethylene/vinyl alcohol copolymer having a weight average molecular weight (Mw) of at least 80,000 and a molecular weight distribution (Mw/Mn) of at least 2.1.
Claim 3
Dependent Claim
51 words
An injection-molded body obtained by injecting a melt of an olefin/vinyl alcohol copolymer into a cooled mold through an injection nozzle, wherein the olefin/vinyl alcohol copolymer in the injection-molded body has a weight average molecular weight (Mw) of at least 80,000 and a molecular weight distribution (Mw/Mn) of at least 2.1.
Claim 4
Dependent Claim
51 words
An injection-molded body obtained by injecting a melt of an olefin/vinyl alcohol copolymer into a cooled mold through an injection nozzle, wherein the olefin/vinyl alcohol copolymer in the injection-molded body has a weight average molecular weight (Mw) of at least 80,000 and a molecular weight distribution (Mw/Mn) of at least 2.1.
Claim 5
Dependent Claim
29 words
An injection-molded body as set forth in claim 2, wherein the olefin/vinyl alcohol copolymer in the injection-molded body has a weight average molecular weight (Mw) of at least 100,000.
Claim 6
Dependent Claim
19 words
An injection-molded body as set forth in claim 2, wherein the olefin/vinyl alcohol copolymer is an ethylene/vinyl alcohol copolymer.
Claim 7
Dependent Claim
145 words
An injection-molded body which comprises an ethylene/vinyl alcohol copolymer having a weight average molecular weight (Mw) of at least 80,000 and a molecular weight distribution (Mw/Mn) of at least 2.1, said molded body being obtained by melt-kneading a composition comprising (i) a high-molecular-weight olefin/vinyl alcohol copolymer having a melt flow rate of 0.4 to 6.0 g/10 min as determined at 190° C. and a vinyl alcohol content of 40 to 80 mole % and (ii) a low-molecular-weight olefin/vinyl alcohol copolymer having a melt flow rate of 3.0 to 60 g/10 min as determined at 190° C., which is higher by at least 0.5 g/10 min than that of the high-molecular-weight ethylene/vinyl alcohol copolymer (i), and a vinyl alcohol content of 45 to 85 mole %, at a weight ratio of from 98/2 to 40/60, and injecting the melt-kneaded composition into a mold through a nozzle.
Claim 8
Dependent Claim
145 words
An injection-molded body which comprises an ethylene/vinyl alcohol copolymer having a weight average molecular weight (Mw) of at least 80,000 and a molecular weight distribution (Mw/Mn) of at least 2.1, said molded body being obtained by melt-kneading a composition comprising (i) a high-molecular-weight olefin/vinyl alcohol copolymer having a melt flow rate of 0.4 to 6.0 g/10 min as determined at 190° C. and a vinyl alcohol content of 40 to 80 mole % and (ii) a low-molecular-weight olefin/vinyl alcohol copolymer having a melt flow rate of 3.0 to 60 g/10 min as determined at 190° C., which is higher by at least 0.5 g/10 min than that of the high-molecular-weight ethylene/vinyl alcohol copolymer (i), and a vinyl alcohol content of 45 to 85 mole %, at a weight ratio of from 98/2 to 40/60, and injecting the melt-kneaded composition into a mold through a nozzle.
Claim 9
Dependent Claim
50 words
A multi-layer injection-molded body which comprises inner and outer layers of a creep-resistant thermoplastic resin and an intermediate layer of an ethylene/vinyl alcohol copolymer, wherein the ethylene/vinyl alcohol copolymer has a weight average molecular weight (Mw) of at least 80,000 and a molecular weight distribution (Mw/Mn) of at least 2.1.
Claim 10
Dependent Claim
50 words
A multi-layer injection-molded body which comprises inner and outer layers of a creep-resistant thermoplastic resin and an intermediate layer of an ethylene/vinyl alcohol copolymer, wherein the ethylene/vinyl alcohol copolymer has a weight average molecular weight (Mw) of at least 80,000 and a molecular weight distribution (Mw/Mn) of at least 2.1.
Claim 11
Dependent Claim
27 words
A multi-layer injection-molded body as set forth in claim 6, wherein said intermediate layer has a thickness deviation below 30% as defined by the following formula: ##EQU1##
Claim 12
Dependent Claim
71 words
A multi-layer injection-molded body comprising inner and outer layers of a creep-resistant thermoplastic resin and an intermediate layer of an olefin/vinyl alcohol copolymer, which is obtained by simultaneously or sequentially injecting the olefin/vinyl alcohol copolymer and the creep-resistant thermoplastic resin, wherein the olefin/vinyl alcohol copolymer in the multi-layer injection-molded body has a weight average molecular weight (Mw) of at least 80,000 and a molecular weight distribution (Mw/Mn) of at least 2.1.
Claim 13
Dependent Claim
71 words
A multi-layer injection-molded body comprising inner and outer layers of a creep-resistant thermoplastic resin and an intermediate layer of an olefin/vinyl alcohol copolymer, which is obtained by simultaneously or sequentially injecting the olefin/vinyl alcohol copolymer and the creep-resistant thermoplastic resin, wherein the olefin/vinyl alcohol copolymer in the multi-layer injection-molded body has a weight average molecular weight (Mw) of at least 80,000 and a molecular weight distribution (Mw/Mn) of at least 2.1.
Claim 14
Dependent Claim
25 words
A multi-layer injection-molded body as set forth in claim 8, which is a vessel, a vessel lid or a preform for formation of a vessel.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-26 | 1993-08-28 | 1994-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-26 | 1997-08-28 | 1998-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-26 | 2001-08-28 | 2002-02-27 | $7700.00 | Window Closed / Lapsed |