US4188350A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Olefin polymer blends and films therefrom
Assignee: Viskase Corp
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Filing: 1978-01-17
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Granted: 1980-02-12
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Expires: 1998-01-17
Abstract
Abstract A heat-shrinkable multilayer film suitable for use in the packaging of a frozen poultry, includes a first outer layer comprising a blend of a propylene-ethylene copolymer having a high isotactic molecular structure with less than about 6% by weight ethylene and having a melt flow of from about 1.5 to about 18 decigrams per minute; a (butene-1)-ethylene copolymer having a high isotactic molecular structure with less than about 10% by weight being ethylene and having a melt flow of from about 0.1 to about 5.0 decigrams per minute, and a thermoplastic elastomer selected from the group consisting of ethylene-propylene copolymers and ethylene-propylene diene terpolymers, the ratio by weight of the propylene-ethylene copolymer to the (butene-1)-ethylene copolymer being from about 2:1 to about 1:2 and the thermoplastic elastomer being present from about 10% to about 50% by weight; at least one core layer capable of being biaxially oriented and heat shrinkable and comprising an extrudable adhesive; and a second outer layer comprising a polymer selected from the group consisting of ethylene homopolymers and copolymers each having a highly branched molecular structure; the multilayer film being biaxially oriented.
Inventors
- 👤 Stephen J. Vicik
- 👤 William J. Kohler
- 👤 James O. Funderburk, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:10
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; B32B7/00; B32B7/04; B32B7/12; C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/14; C08L23/142; C08L23/16; C08L23/18; C08L23/20; B32B2250/00; B32B2250/03; B32B2270/00; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/518; B32B2307/70; B32B2307/732; B32B2307/734; B32B2307/736; B32B2323/00; C08L2205/00; C08L2205/02; C08L2205/03; C08L23/04; C08L23/06; C08L23/08; C08L23/0846; C08L23/0869; C08L23/0876; C08L53/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31917
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
123 words
A polymer resin mixture comprising: a propylene-ethylene copolymer having a high isotactic molecular structure, containing up to about 6% by weight ethylene, and having a melt flow of from about 1.5 to about 18 decigrams per minute; a (butene-1)-ethylene copolymer having a high isotactic molecular structure, containing from about 1% to about 10% by weight ethylene, and having a melt flow of from about 0.1 to about 5.0 decigrams per minute; and a thermoplastic elastomer selected from the group consisting of ethylene-propylene copolymers and ethylene propylene diene terpolymers, the ratio by weight of said propylene-ethylene copolymer to said (butene-1)-ethylene copolymer being from about 2:1 to about 1:2 and said thermoplastic elastomer being present from about 10% by weight to about 50% by weight.
Claim 2
Dependent Claim
123 words
A polymer resin mixture comprising: a propylene-ethylene copolymer having a high isotactic molecular structure, containing up to about 6% by weight ethylene, and having a melt flow of from about 1.5 to about 18 decigrams per minute; a (butene-1)-ethylene copolymer having a high isotactic molecular structure, containing from about 1% to about 10% by weight ethylene, and having a melt flow of from about 0.1 to about 5.0 decigrams per minute; and a thermoplastic elastomer selected from the group consisting of ethylene-propylene copolymers and ethylene propylene diene terpolymers, the ratio by weight of said propylene-ethylene copolymer to said (butene-1)-ethylene copolymer being from about 2:1 to about 1:2 and said thermoplastic elastomer being present from about 10% by weight to about 50% by weight.
Claim 3
Dependent Claim
22 words
The resin mixture of claim 1, wherein the ratio by weight of said propylene-ethylene copolymer to said (butene-1)-ethylene copolymer is about 2:1.
Claim 4
Dependent Claim
22 words
The resin mixture of claim 1, wherein the ratio by weight of said propylene-ethylene copolymer to said (butene-1)-ethylene copolymer is about 1:1.
Claim 5
Dependent Claim
22 words
The resin mixture of claim 1, wherein the ratio by weight of said propylene-ethylene copolymer to said (butene-1)-ethylene copolymer is about 1:2.
Claim 6
Dependent Claim
24 words
The resin mixture of claim 1, wherein said propylene-ethylene copolymer has a density of from about 0.89 to about 0.91 gram per cubic centimeter.
Claim 7
Dependent Claim
24 words
The resin mixture of claim 1, wherein said propylene-ethylene copolymer has a melt flow of from about 3.5 to about 12.0 decigrams per minute.
Claim 8
Dependent Claim
20 words
The resin mixture of claim 1, wherein said thermoplastic elastomer is present from about 20% to about 40% by weight.
Claim 9
Dependent Claim
15 words
The resin mixture of claim 1, wherein said thermoplastic elastomer comprises an ethylene-propylene copolymer elastomer.
Claim 10
Dependent Claim
22 words
The resin mixture of claim 8, wherein said ethylene-propylene copolymer elastomer comprises ethylene in the amount of at least 50% by weight.
Claim 11
Dependent Claim
21 words
The resin mixture of claim 9, wherein said ethylene-propylene copolymer elastomer comprises ethylene in the amount of about 70% by weight.
Claim 12
Dependent Claim
26 words
The resin mixture of claim 10, wherein said ethylene-propylene copolymer elastomer has a Mooney viscosity at 260° F. of from about 23 to about 50 centipoises.
Claim 13
Dependent Claim
17 words
The resin mixture of claim 1, wherein said thermoplastic elastomer comprises an ethylene propylene diene modified terpolymer.
Claim 14
Dependent Claim
36 words
The resin mixture of claim 1, wherein the ratio by weight of said propylene-ethylene copolymer to said (butene-1)-ethylene copolymer is about 1:1 and said thermoplastic elastomer is present from about 20% to about 40% by weight.
Claim 15
Dependent Claim
123 words
A heat-shrinkable thermoplastic film comprising: a propylene-ethylene copolymer having a high isotactic molecular structure, containing up to about 6% by weight ethylene, and having a melt flow of from about 1.5 to about 18 decigrams per minute; a (butene-1)-ethylene copolymer having a high isotactic molecular structure, containing from about 1% to about 10% by weight ethylene, and having a melt flow of from about 0.1 to about 5.0 decigrams per minute; and a thermoplastic elastomer selected from the group consisting of ethylene-propylene copolymers and ethylene propylene diene terpolymers, the ratio by weight of said propylene-ethylene copolymer to said (butene-1)-ethylene copolymer being from about 2:1 to about 1:2 and said thermoplastic elastomer being present from about 10% by weight to about 50% by weight.
Claim 16
Dependent Claim
123 words
A heat-shrinkable thermoplastic film comprising: a propylene-ethylene copolymer having a high isotactic molecular structure, containing up to about 6% by weight ethylene, and having a melt flow of from about 1.5 to about 18 decigrams per minute; a (butene-1)-ethylene copolymer having a high isotactic molecular structure, containing from about 1% to about 10% by weight ethylene, and having a melt flow of from about 0.1 to about 5.0 decigrams per minute; and a thermoplastic elastomer selected from the group consisting of ethylene-propylene copolymers and ethylene propylene diene terpolymers, the ratio by weight of said propylene-ethylene copolymer to said (butene-1)-ethylene copolymer being from about 2:1 to about 1:2 and said thermoplastic elastomer being present from about 10% by weight to about 50% by weight.
Claim 17
Dependent Claim
21 words
The film of claim 14, wherein the ratio by weight of said propylene-ethylene copolymer to said (butene-1)-ethylene copolymer is about 2:1.
Claim 18
Dependent Claim
21 words
The film of claim 14, wherein the ratio by weight of said propylene-ethylene copolymer to said (butene-1)-ethylene copolymer is about 1:1.
Claim 19
Dependent Claim
21 words
The film of claim 14, wherein the ratio by weight of said propylene-ethylene copolymer to said (butene-1)-ethylene copolymer is about 1:2.
Claim 20
Dependent Claim
23 words
The film of claim 14, wherein said propylene-ethylene copolymer has a density of from about 0.89 to about 0.91 gram per cubic centimeter.
Claim 21
Dependent Claim
23 words
The film of claim 14, wherein said propylene-ethylene copolymer has a melt flow of from about 3.5 to about 12.0 decigrams per minute.
Claim 22
Dependent Claim
19 words
The film of claim 14, wherein said thermoplastic elastomer is present from about 20% to about 40% by weight.
Claim 23
Dependent Claim
14 words
The film of claim 14, wherein said thermoplastic elastomer comprises an ethylene-propylene copolymer elastomer.
Claim 24
Dependent Claim
21 words
The film of claim 21, wherein said ethylene-propylene copolymer elastomer comprises ethylene in the amount of at least 50% by weight.
Claim 25
Dependent Claim
20 words
The film of claim 22, wherein said ethylene-propylene copolymer elastomer comprises ethylene in the amount of about 70% by weight.
Claim 26
Dependent Claim
25 words
The film of claim 23, wherein said ethylene-propylene copolymer elastomer has a Mooney viscosity at 260° F. of from about 23 to about 50 centipoises.
Claim 27
Dependent Claim
15 words
The film of claim 14, wherein said thermoplastic elastomer comprises an ethylene-propylene diene modified terpolymer.
Claim 28
Dependent Claim
35 words
The film of claim 14, wherein the ratio by weight of said propylene-ethylene copolymer to said (butene-1)-ethylene copolymer is about 1:1 and said thermoplastic elastomer is present from about 20% to about 40% by weight.
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) | 1983-02-11 | 1983-08-13 | 1984-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-11 | 1987-08-13 | 1988-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-11 | 1991-08-13 | 1992-02-12 | $7700.00 | Window Closed / Lapsed |