US5283128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biaxially oriented heat shrinkable film
Assignee: Curwood Inc
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Filing: 1992-03-23
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Granted: 1994-02-01
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Expires: 2012-03-23
Abstract
Abstract A biaxially heat-shrinkable food packaging film comprises a three component blend wherein the major constituents are a polyethylene such as VLDPE or LLDPE or a mixture thereof, EVA and an ethylene alpha-olefin plastomer copolymer of a density below about 0.90 g/cm 3 .
Inventors
- 👤 Darrell L. Wilhoit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:45
CPC Classifications
B; B32; B32B; B32B27/00; C; C08; C08J; C08J5/00; C08J5/18; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815; C08L23/0846; C08L23/0853; C08J2323/00; C08J2323/02; C08J2323/04; C08L2205/00; C08L2205/02; C08L2205/03; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/13; Y10T428/1328; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
110 words
A biaxially oriented heat-shrinkable film comprising a three component blend of a polyethylene member selected from the group consisting of VLDPE and LLDPE or a mixture thereof, ethylene alpha-olefin plastomer copolymer of density below about 0.90 g/cm 3 and ethylene vinyl acetate as major components, wherein as between the polyethylene and ethylene vinyl acetate total the polyethylene comprises between about 35 and about 60 wt. % of the total and ethylene vinyl acetate comprises between about 40 and about 65 wt. % of the total, and wherein said ethylene alpha-olefin plastomer copolymer comprises between about 10 and about 20 wt. % of the total weight of said three component blend.
Claim 2
Dependent Claim
110 words
A biaxially oriented heat-shrinkable film comprising a three component blend of a polyethylene member selected from the group consisting of VLDPE and LLDPE or a mixture thereof, ethylene alpha-olefin plastomer copolymer of density below about 0.90 g/cm 3 and ethylene vinyl acetate as major components, wherein as between the polyethylene and ethylene vinyl acetate total the polyethylene comprises between about 35 and about 60 wt. % of the total and ethylene vinyl acetate comprises between about 40 and about 65 wt. % of the total, and wherein said ethylene alpha-olefin plastomer copolymer comprises between about 10 and about 20 wt. % of the total weight of said three component blend.
Claim 3
Dependent Claim
15 words
A biaxially oriented heat-shrinkable film according to claim 1 wherein said film is a monolayer.
Claim 4
Dependent Claim
21 words
A biaxially oriented heat-shrinkable film according to claim 1 wherein said blend comprises at least one layer of a multilayer film.
Claim 5
Dependent Claim
33 words
A biaxially oriented heat-shrinkable film according to claim 1 wherein said ethylene alpha-olefin plastomer copolymer comprises between about 13 and about 17 wt. % of the total weight of said three component blend.
Claim 6
Dependent Claim
15 words
A biaxially oriented heat-shrinkable film according to claim 1 wherein said polyethylene member is VLDPE.
Claim 7
Dependent Claim
32 words
A biaxially oriented heat-shrinkable film according to claim 1 wherein said polyethylene member is VLDPE comprising between about 45 and about 55 wt. % of the VLDPE and ethylene vinyl acetate total.
Claim 8
Dependent Claim
32 words
A biaxially oriented heat-shrinkable film according to claim 1 wherein said polyethylene member is LLDPE comprising between about 45 and about 55 wt. % of the LLDPE and ethylene vinyl acetate total.
Claim 9
Dependent Claim
48 words
A biaxially oriented heat-shrinkable film according to claim 3 wherein said multilayer film comprises at least three layers including an oxygen barrier core layer between a first outer layer and a second outer layer and said blend comprising at least one of the first and second outer layers.
Claim 10
Dependent Claim
24 words
A biaxially oriented heat-shrinkable film according to claim 1 wherein said polyethylene member is VLDPE having higher crystallinity than said ethylene alpha-olefin plastomer copolymer.
Claim 11
Dependent Claim
25 words
A biaxially oriented heat-shrinkable film according to claim 1 wherein said polyethylene member is VLDPE melting at higher temperature than said ethylene alpha-olefin plastomer copolymer.
Claim 12
Dependent Claim
43 words
A biaxially oriented heat-shrinkable film according to claim 1 wherein said polyethylene member is VLDPE having a crystalline melting point between about 100° C. and about 125° C., and said ethylene alpha-olefin plastomer copolymer melts between about 55° C. and about 85° C.
Claim 13
Dependent Claim
28 words
A biaxially oriented heat-shrinkable film according to claim 1 wherein said polyethylene member is VLDPE having a crystalline melting point between about 115° C. and about 125° C.
Claim 14
Dependent Claim
27 words
A biaxially oriented heat-shrinkable film according to claim 1 wherein said polyethylene member is VLDPE having a higher Young's modulus value than said ethylene alpha-olefin plastomer copolymer.
Claim 15
Dependent Claim
26 words
A biaxially oriented heat-shrinkable film according to claim 1 wherein said polyethylene member is VLDPE having a Vicat softening point of at least about 68° C.
Claim 16
Dependent Claim
25 words
A biaxially oriented heat-shrinkable film according to claim 14 wherein said VLDPE has a Vicat softening point between about 78° C. and about 100° C.
Claim 17
Dependent Claim
23 words
A biaxially oriented heat-shrinkable film according to claim 1 wherein said ethylene alpha-olefin plastomer has a Vicat softening point below about 68° C.
Claim 18
Dependent Claim
27 words
A biaxially oriented heat-shrinkable film according to claim 16 wherein said ethylene alpha-olefin plastomer has a Vicat softening point between about 50° C. and about 65° C.
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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) | 1997-01-31 | 1997-08-02 | 1998-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-31 | 2001-08-02 | 2002-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-31 | 2005-08-02 | 2006-02-01 | $7700.00 | Window Closed / Lapsed |