US5053259A
Expired / Lapsed
US
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Amorphous nylon copolymer and copolyamide films and blends
Assignee: Viskase Corp
•
Filing: 1988-08-23
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Granted: 1991-10-01
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Expires: 2008-08-23
Abstract
Abstract Novel orientable single and multilayer thermoplastic flexible films utilizing blends comprising an amorphous nylon copolymer such as nylon 6I/6T and a nylon copolyamide having a melting point of at least about 145° C. having improved processability, shrinkage and optical properties.
Inventors
- 👤 Stephen J. Vicik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:47
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/34; B32B27/06; B32B27/08; B32B27/16; B32B27/30; B32B27/306; B32B27/32; C; C08; C08L; C08L77/00; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/50; B32B2307/514; B32B2307/518; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2307/7244; B32B2323/00; B32B2323/04; B32B2323/046; B32B2331/00; B32B2331/04; B32B2377/00; B32B2439/00; B32B2439/70; B32B2597/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/139; Y10T428/1393; Y10T428/31504; Y10T428/31725; Y10T428/31728; Y10T428/31732; Y10T428/31739; Y10T428/31743; Y10T428/31746; Y10T428/3175; Y10T428/31757
Claims Analysis
Total Claims: 54
Claim 1
Independent Claim
72 words
An oriented multilayer film comprising a first outer layer, a second outer layer, and at least one intermediate layer between said first outer layer and said second outer layer, said intermediate layer comprising a blend of (a) an amorphous nylon copolymer which is present in an amount of from about 10 to about 50 weight percent of said blend, and (b) a copolyamide having a melting point of at least 145° C.
Claim 2
Dependent Claim
72 words
An oriented multilayer film comprising a first outer layer, a second outer layer, and at least one intermediate layer between said first outer layer and said second outer layer, said intermediate layer comprising a blend of (a) an amorphous nylon copolymer which is present in an amount of from about 10 to about 50 weight percent of said blend, and (b) a copolyamide having a melting point of at least 145° C.
Claim 3
Dependent Claim
15 words
An oriented multilayer film, as defined in claim 1, wherein said film is biaxially oriented.
Claim 4
Dependent Claim
15 words
An oriented multilayer film, as defined in claim 1, wherein said intermediate layer is irradiated.
Claim 5
Dependent Claim
18 words
An oriented multilayer film, as defined in claim 1, wherein each layer of said multilayer film is irradiated.
Claim 6
Dependent Claim
35 words
An oriented multilayer film, as defined in claim 1, wherein said film has an O 2 permeability of less than 4.5 cc/100 in. 2 in 24 hrs. at 1 atmosphere as measured by ASTM D-3985-81.
Claim 7
Dependent Claim
28 words
An oriented multilayer film, as defined in claim 1, wherein said film has a shrinkage value in at least one direction of at least 20% at 90° C.
Claim 8
Dependent Claim
21 words
An oriented multilayer film, as defined in claim 1, wherein said copolyamide comprises a copolymer of nylon 6 and nylon 12.
Claim 9
Dependent Claim
21 words
An oriented multilayer film, as defined in claim 1, wherein said copolyamide comprises a copolymer of nylon 6 and nylon 66.
Claim 10
Dependent Claim
24 words
An oriented multilayer film, as defined in claim 1, wherein said copolyamide comprises a copolymer of nylon 6 with at least one other polyamide.
Claim 11
Dependent Claim
35 words
An oriented multilayer film, as defined in claim 1, wherein said copolyamide having a melting point of at least 145° C. is present in an amount of from about 10 to about 90 weight percent.
Claim 12
Dependent Claim
28 words
An oriented multilayer film, as defined in claim 1, wherein said film has a shrinkage value in at least one direction of at least 5% at 90° C.
Claim 13
Dependent Claim
32 words
An oriented multilayer film, as defined in claim 1, wherein said film is biaxially oriented and has shrinkage values of at least 5% at 90° C. in both machine and transverse directions.
Claim 14
Dependent Claim
22 words
An oriented multilayer film, as defined in claim 1, wherein said first and second outer layers and said intermediate layer are coextruded.
Claim 15
Dependent Claim
28 words
An oriented multilayer film, as defined in claim 13, wherein said film is a three layer tubular film and said first outer layer is a heat sealable layer.
Claim 16
Dependent Claim
17 words
An oriented multilayer film, as defined in claim 1, wherein said amorphous nylon copolymer comprises hexamethyleneisophthalamide-hexamethyleneterephthalamide copolymer.
Claim 17
Dependent Claim
22 words
An oriented multilayer film, as defined in claim 5, wherein said copolymer comprises from about 65% to about 80% hexamethyleneisophthalamide polymer units.
Claim 18
Dependent Claim
27 words
An oriented multilayer film, as defined in claim 1, wherein said first outer layer comprises a polyolefin, nylon, ionomer, PVDC, EVA, or EVOH, or a mixture thereof.
Claim 19
Dependent Claim
21 words
An oriented multilayer film, as defined in claim 17, wherein said second outer layer comprises a polyolefin, EVA or mixture thereof.
Claim 20
Dependent Claim
26 words
An oriented multilayer film, as defined in claim 1, wherein said first outer layer comprises ethylene vinyl acetate copolymer, very low density polyethylene or mixtures thereof.
Claim 21
Dependent Claim
26 words
An oriented multilayer film, as defined in claim 19, wherein said second outer layer comprises ethylene vinyl acetate copolymer, very low density polyethylene or mixtures thereof.
Claim 22
Dependent Claim
21 words
An oriented multilayer film, as defined in claim 1, wherein said intermediate layer further comprises a polyamide homopolymer in said blend.
Claim 23
Dependent Claim
27 words
An oriented multilayer film, as defined in claim 21, wherein said polyamide homopolymer is present in an amount of from about 10 to about 30 weight percent.
Claim 24
Dependent Claim
20 words
An oriented multilayer film, as defined in claim 21, wherein said homopolymer comprises nylon 6, nylon 11, or nylon 12.
Claim 25
Dependent Claim
45 words
An oriented multilayer film, as defined in claim 1, wherein said copolyamide has a melting point within a range of from about 145° C. to about 215° C. and said copolyamide is present in an amount of from about 40 to about 90 weight percent.
Claim 26
Dependent Claim
35 words
An oriented multilayer film, as defined in claim 24, further comprising a polyamide homopolymer in said blend, wherein said polyamide homopolymer is present in an amount of from about 10 to about 30 weight percent.
Claim 27
Dependent Claim
20 words
An oriented multilayer film, as defined in claim 25, wherein said copolyamide is nylon 6/12, nylon 6/66, or mixtures thereof.
Claim 28
Dependent Claim
16 words
An oriented multilayer film, as defined in claim 25, wherein said polyamide homopolymer comprises nylon 6.
Claim 29
Dependent Claim
20 words
An oriented multilayer film, as defined in claim 27, wherein said copolyamide is nylon 6/12, nylon 6/66, or mixtures thereof.
Claim 30
Dependent Claim
16 words
An oriented multilayer film, as defined in claim 25, wherein said polyamide homopolymer comprises nylon 11.
Claim 31
Dependent Claim
20 words
An oriented multilayer film, as defined in claim 29, wherein said copolyamide is nylon 6/12, nylon 6/66, or mixtures thereof.
Claim 32
Dependent Claim
16 words
An oriented multilayer film, as defined in claim 25, wherein said polyamide homopolymer comprises nylon 12.
Claim 33
Dependent Claim
20 words
An oriented multilayer film, as defined in claim 31, wherein said copolyamide is nylon 6/12, nylon 6/66, or mixtures thereof.
Claim 34
Dependent Claim
68 words
An oriented, heat-shrinkable multilayer film comprising: (i) at least one nylon containing layer having a blend of (a) an amorphous nylon and (b) a copolyamide having a melting point of at least about 145° C.; and (ii) at least one other thermoplastic layer adjacent to said nylon-containing layer; wherein said multilayer film has a shrinkage value in at least one direction of at least 5% at 90° C.
Claim 35
Dependent Claim
68 words
An oriented, heat-shrinkable multilayer film comprising: (i) at least one nylon containing layer having a blend of (a) an amorphous nylon and (b) a copolyamide having a melting point of at least about 145° C.; and (ii) at least one other thermoplastic layer adjacent to said nylon-containing layer; wherein said multilayer film has a shrinkage value in at least one direction of at least 5% at 90° C.
Claim 36
Dependent Claim
16 words
A multilayer film, as defined in claim 33, wherein said shrinkage value is at least 20%.
Claim 37
Dependent Claim
25 words
A multilayer film, as defined in claim 33, wherein said shrinkage value is at least 20% in both the machine direction and the transverse direction.
Claim 38
Dependent Claim
17 words
A multilayer film, as defined in claim 33, wherein said amorphous nylon comprises a nylon 6I,6T copolymer.
Claim 39
Dependent Claim
27 words
A multilayer film, as defined in claim 33, wherein said copolyamide is present in an amount of from about 10 to 90 weight percent of said blend.
Claim 40
Dependent Claim
20 words
A multilayer film, as defined in claim 33, wherein said nylon-containing layer further comprises a polyamide homopolymer in said blend.
Claim 41
Dependent Claim
23 words
A multilayer film, as defined in claim 33, wherein said copolyamide has a melting point between about 195° C. and about 200° C.
Claim 42
Dependent Claim
23 words
A multilayer film, as defined in claim 33, wherein said copolyamide has a melting point between about 145° C. and about 215° C.
Claim 43
Dependent Claim
20 words
A multilayer film, as defined in claim 40, wherein said copolyamide comprises a copolymer of nylon 6 and nylon 12.
Claim 44
Dependent Claim
20 words
A multilayer film, as defined in claim 40, wherein said copolyamide comprises a copolymer of nylon 6 and nylon 66.
Claim 45
Dependent Claim
28 words
A multilayer film, as defined in claim 33, wherein said amorphous nylon is present in an amount of from 10 to about 70 weight percent of said blend.
Claim 46
Dependent Claim
27 words
A multilayer film, as defined in claim 43, wherein said copolyamide is present in an amount of from about 10 to 90 weight percent of said blend.
Claim 47
Dependent Claim
27 words
A multilayer film, as defined in claim 44, wherein said copolyamide comprises nylon 6,12 and has a melting point between about 145° C. and about 215° C.
Claim 48
Dependent Claim
30 words
A multilayer film, as defined in claim 45, wherein said amorphous nylon comprises hexamethyleneisophthalamide-hexamethyleneterphthalamide copolymer wherein about 65% to about 80% of said amorphous nylon copolymer comprises hexamethyleneisophthalamide polymer units.
Claim 49
Dependent Claim
49 words
A multilayer film, as defined in claim 46, further comprising, in said nylon-containing layer blend, an additional nylon 6/12 copolyamide having a melting point less than 145° C., and nylon 6, nylon 11 or nylon 12 in an amount of from 0 to 30 weight percent of said blend.
Claim 50
Dependent Claim
82 words
An oriented multilayer film comprising a first outer layer, a second outer layer, and at least one intermediate layer between said first outer layer and said second outer layer, said intermediate layer comprising a blend of (a) an amorphous nylon copolymer and (b) a copolyamide having a melting point of at least 145° C. wherein (a) is present in said blend in an amount of from about 12 to about 56 weight percent based upon the total weight of (a) and (b).
Claim 51
Dependent Claim
82 words
An oriented multilayer film comprising a first outer layer, a second outer layer, and at least one intermediate layer between said first outer layer and said second outer layer, said intermediate layer comprising a blend of (a) an amorphous nylon copolymer and (b) a copolyamide having a melting point of at least 145° C. wherein (a) is present in said blend in an amount of from about 12 to about 56 weight percent based upon the total weight of (a) and (b).
Claim 52
Dependent Claim
31 words
A multilayer film, as defined in claim 48, wherein (b) is present in an amount of from 44 to 88 weight percent based upon the total weight of (a) and (b).
Claim 53
Dependent Claim
56 words
A biaxially oriented multilayer film having at least one layer which comprises a blend of (a) an amorphous nylon 6I,6T, (b) a nylon 6,12 having a melting point between about 195° C. and about 200° C., and (c) a nylon 6,12 having a melting point less than 145° C., and at least one other thermoplastic layer.
Claim 54
Dependent Claim
56 words
A biaxially oriented multilayer film having at least one layer which comprises a blend of (a) an amorphous nylon 6I,6T, (b) a nylon 6,12 having a melting point between about 195° C. and about 200° C., and (c) a nylon 6,12 having a melting point less than 145° C., and at least one other thermoplastic layer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-09-30 | 1995-04-01 | 1995-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-30 | 1999-04-01 | 1999-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-30 | 2003-04-01 | 2003-10-01 | $7700.00 | Window Closed / Lapsed |