US5126401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blends of ethylene vinyl alcohol copolymer and polyamides, and multilayer containers made therefrom
Assignee: EIDP Inc
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Filing: 1990-07-19
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Granted: 1992-06-30
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Expires: 2010-07-19
Abstract
Abstract A blenad consisting ethylene vinyl alcohol copolymer and a polyamide blend of an amorphous polyamide and a semicrystalline polyamide which is miscible with the amorphous polyamide but substantially immiscible with the vinyl alcohol copolymer exhibits good mechanical and barrier properties as well as good resistance to thermal degradation.
Inventors
- 👤 Richard T. Chou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:39
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B29; B29C; B29C51/00; B29C51/14; B32B27/28; B32B7/00; B32B7/04; B32B7/12; C; C08; C08J; C08J5/00; C08J5/18; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0846; C08L23/0853; C08L23/0861; C08L29/00; C08L29/02; C08L29/04; C08L77/00; C08L77/06; B32B2270/00; B32B2307/00; B32B2307/50; B32B2307/514; C08J2329/00; C08J2329/02; C08J2329/04; Y; Y10; Y10S; Y10S525/00; Y10S525/933
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
131 words
A blend consisting essentially of: (a) about 5 to about 95 percent by weight of an ethylene vinyl alcohol copolymer having a copolymerized ethylene content of about 20 to about 60 mole percent and a degree of saponification of at least about 90%, and (b) about 95 to about 5 percent by weight of a polyamide blend consisting essentially of (i) about 35 to about 95 percent by weight of at least one amorphous polyamide having a glass transition temperature of up to about 160° C. and (ii) about 5 to about 65 percent by weight of at least one semicrystalline polyamide which has a methylene group/amide group ratio in the range of about 5.5 to about 7.5 and which forms separate domains when blended with said ethylene vinyl alcohol copolymer.
Claim 2
Dependent Claim
131 words
A blend consisting essentially of: (a) about 5 to about 95 percent by weight of an ethylene vinyl alcohol copolymer having a copolymerized ethylene content of about 20 to about 60 mole percent and a degree of saponification of at least about 90%, and (b) about 95 to about 5 percent by weight of a polyamide blend consisting essentially of (i) about 35 to about 95 percent by weight of at least one amorphous polyamide having a glass transition temperature of up to about 160° C. and (ii) about 5 to about 65 percent by weight of at least one semicrystalline polyamide which has a methylene group/amide group ratio in the range of about 5.5 to about 7.5 and which forms separate domains when blended with said ethylene vinyl alcohol copolymer.
Claim 3
Dependent Claim
24 words
The blend of claim 1 wherein the at least one semicrystalline polyamide has a methylene group/amide group ratio of about 5.7 to about 6.7.
Claim 4
Dependent Claim
22 words
The blend of claim 1 wherein the amorphous polyamide comprises about 50 to about 80 percent by weight of the polyamide blend.
Claim 5
Dependent Claim
66 words
The blend of claim 1 wherein the semicrystalline polyamide is selected from the group consisting of nylon 69, nylon 610, copolymers of caprolactam and laurolactam with comonomer weight ratios of about 85/15 to about 45/55, copolymers of nylon 6 and nylon 69 with weight ratios of about 50/50 to 0/100, and copolymers of nylon 66 and nylon 610 with weight ratios of about 70/30 to 0/100.
Claim 6
Dependent Claim
37 words
The blend of claim 1 wherein the ethylene vinyl alcohol copolymer is present at about 30 to about 85 percent by weight and the polyamide blend is present at about 15 to about 70 percent by weight.
Claim 7
Dependent Claim
21 words
The blend of claim 1 wherein the ethylene vinyl alcohol copolymer contains about 25 to about 50 mole percent copolymerized ethylene.
Claim 8
Dependent Claim
22 words
The blend of claim 6 wherein the ethylene vinyl alcohol copolymer has a degree of saponification of at least about 95 percent.
Claim 9
Dependent Claim
21 words
The blend of claim 1 wherein the amorphous polyamide has a glass transition temperature of about 80° to about 130° C.
Claim 10
Dependent Claim
50 words
The blend of claim 1 wherein the amorphous polyamide is selected from the group consisting of hexamethylenediamine isophthalamide, hexamethylenediamine isophthalamide/terephthalamide terpolymer, having isophthalic/terephthalic moiety ratios of 100/0 to 60/40, mixtures of 2,2,4- and 2,4,4-trimethylhexamethylenediamine terephthalamide, copolymers of hexamethylenediamine and 2-methylpentamethylenediamine with iso- or terephthalic acids, or mixtures of these acids.
Claim 11
Dependent Claim
21 words
The blend of claim 9 wherein the amorphous polyamide is hexamethylenediamine isophthalamide/terephthalamide terpolymer, having an isophthalic/terephthalic moiety ratio of about 70/30.
Claim 12
Dependent Claim
9 words
A film prepared from the blend of claim 1.
Claim 13
Dependent Claim
9 words
A film prepared from the blend of claim 2.
Claim 14
Dependent Claim
9 words
A film prepared from the blend of claim 3.
Claim 15
Dependent Claim
9 words
A film prepared from the blend of claim 5.
Claim 16
Dependent Claim
9 words
A film prepared from the blend of claim 9.
Claim 17
Dependent Claim
19 words
A multiple layer structure wherein at least one of the layers is prepared from the blend of claim 1.
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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) | 1995-06-30 | 1995-12-30 | 1996-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-30 | 1999-12-30 | 2000-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-30 | 2003-12-30 | 2004-06-30 | $7700.00 | Window Closed / Lapsed |