US4447480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shrinkable film for poultry bags
Assignee: Viskase Corp
•
Filing: 1982-12-01
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Granted: 1984-05-08
•
Expires: 2002-12-01
Abstract
Abstract A heat-shrinkable film suitable for use in fabricating bags for packaging frozen poultry. The film composition comprises a resin mixture of between about 80 and about 95 weight percent of an ethylene-vinyl acetate copolymer having a vinyl acetate content of from at least about 1.7 to about 4.5 weight percent, and having a melt index of from at least about 0.15 to about 0.35 decigram per minute; and between about 5 and about 20 weight percent of a polyethylene material selected from the group consisting of: (a) high density polyethylene having a melt index of between about 0.15 and about 0.70 decigram per minute, and a density of between about 0.94 and about 0.96 grams per cubic centimeter, and (b) low pressure low density polyethylene having a melt index of between about 0.3 and about 3.0 decigrams per minute, and a density of between about 0.915 and about 0.925 gram per cubic centimeter.
Inventors
- 👤 Stanley Lustig
- 👤 Jeffrey M. Schuetz
- 👤 Stephen J. Vicik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:40
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; B; B29; B29C; B29C61/00; B29C61/003; B32; B32B; B32B27/00; B32B27/32; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0846; C08L23/0853; B29K; B29K2023/00; B29K2023/04; B29K2023/08; B29K2023/083; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/08; C08L23/06; Y; Y10; Y10S; Y10S383/00; Y10S383/908; Y10T; Y10T428/00; Y10T428/13; Y10T428/1328; Y10T428/1331; Y10T428/1334; Y10T428/1345
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
167 words
A heat-shrinkable film, suitable for use in fabricating bags for packaging frozen poultry, comprising a mixture of between about 80 and about 95 percent by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate content of from at least about 1.7 to about 4.5 percent by weight, based on the weight of said ethylene-vinyl acetate copolymer, and having a melt index of from at least about 0.15 to about 0.35 decigram per minute; and between about 5 and about 20 percent by weight, based on the weight of said film, of a polyethylene material selected from the group consisting of: (a) low pressure-high density polyethylene having a melt index of between about 0.15 and about 0.70 decigram per minute, and a density of between about 0.94 and about 0.96 gram per cubic centimeter, and (b) low pressure-low density polyethylene having a melt index of between about 0.3 and 3.0 decigrams per minute, and a density of between about 0.915 and about 0.925 gram per cubic centimeter.
Claim 2
Dependent Claim
167 words
A heat-shrinkable film, suitable for use in fabricating bags for packaging frozen poultry, comprising a mixture of between about 80 and about 95 percent by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate content of from at least about 1.7 to about 4.5 percent by weight, based on the weight of said ethylene-vinyl acetate copolymer, and having a melt index of from at least about 0.15 to about 0.35 decigram per minute; and between about 5 and about 20 percent by weight, based on the weight of said film, of a polyethylene material selected from the group consisting of: (a) low pressure-high density polyethylene having a melt index of between about 0.15 and about 0.70 decigram per minute, and a density of between about 0.94 and about 0.96 gram per cubic centimeter, and (b) low pressure-low density polyethylene having a melt index of between about 0.3 and 3.0 decigrams per minute, and a density of between about 0.915 and about 0.925 gram per cubic centimeter.
Claim 3
Dependent Claim
39 words
The film of claim 1 wherein said ethylene-vinyl acetate copolymer has a vinyl acetate content of between about 2.25 and about 3.0 percent by weight and a melt index of between about 0.2 and about 0.3 decigram per minute.
Claim 4
Dependent Claim
35 words
The film of claim 1 wherein said low pressure-low density polyethylene is a copolymer formed from ethylene and a comonomer selected from the group consisting of butene, pentene, hexene, heptene and octene, and mixtures thereof.
Claim 5
Dependent Claim
22 words
The film of claim 1 wherein said polyethylene material comprises between about 10 and about 15 percent by weight of the film.
Claim 6
Dependent Claim
22 words
The film of claim 3 wherein said copolymer has a melt index of between about 0.3 and about 3.0 decigrams per minute.
Claim 7
Dependent Claim
36 words
The film of claim 3 wherein said copolymer has a melt index of between about 0.5 and about 2.0 decigrams per minute, and a density of between about 0.915 and about 0.920 gram per cubic centimeter.
Claim 8
Dependent Claim
41 words
The film of claim 1 wherein said low pressure-low density polyethylene is a heterogeneous copolymer formed from ethylene, and at least one comonomer selected from the group consisting of propylene and butene-1, and at least one C 5 -C 8 comonomer.
Claim 9
Dependent Claim
36 words
The film of claim 7 wherein said copolymer has a density of between about 0.91 and about 0.94 gram per cubic centimeter, and a melt index of between about 0.3 and about 3.0 decigrams per minute.
Claim 10
Dependent Claim
36 words
The film of claim 7 wherein said copolymer has a melt index of between about 0.5 and about 2.0 decigrams per minute, and a density of between about 0.915 and about 0.925 gram per cubic centimeter.
Claim 11
Dependent Claim
39 words
The film of claim 1 wherein said low pressure-high density polyethylene has a melt index of between about 0.15 and about 0.3 decigram per minute, and a density of between about 0.945 and about 0.955 gram per cubic centimeter.
Claim 12
Dependent Claim
39 words
The film of claim 10 wherein said low pressure-low density polyethylene has a melt index of between about 0.5 and about 2.0 decigrams per minute, and a density of between about 0.915 and about 0.920 gram per cubic centimeter.
Claim 13
Dependent Claim
12 words
The film of claim 1 fabricated in the form of a bag.
Claim 14
Dependent Claim
157 words
A heat-shrinkable film suitable for use in fabricating bags for packaging frozen poultry, comprising a mixture of from about 85 to about 90 percent by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate content of between about 1.7 and about 4.5 percent by weight of said copolymer, and having a melt index of between about 0.15 and about 0.35 decigram per minute; and between about 10 and about 15 percent by weight, based on the weight of said film, of a polyethylene material selected from the group consisting of: (a) low pressure-high density polyethylene having a melt index of between about 0.15 and about 0.70 decigram per minute, and a density of between about 0.94 and about 0.96 gram per cubic centimeter, and (b) low pressure-low density polyethylene having a melt index of between about 0.3 and about 3.0 decigrams per minute, and a density of between about 0.915 and about 0.925 gram per minute.
Claim 15
Dependent Claim
157 words
A heat-shrinkable film suitable for use in fabricating bags for packaging frozen poultry, comprising a mixture of from about 85 to about 90 percent by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate content of between about 1.7 and about 4.5 percent by weight of said copolymer, and having a melt index of between about 0.15 and about 0.35 decigram per minute; and between about 10 and about 15 percent by weight, based on the weight of said film, of a polyethylene material selected from the group consisting of: (a) low pressure-high density polyethylene having a melt index of between about 0.15 and about 0.70 decigram per minute, and a density of between about 0.94 and about 0.96 gram per cubic centimeter, and (b) low pressure-low density polyethylene having a melt index of between about 0.3 and about 3.0 decigrams per minute, and a density of between about 0.915 and about 0.925 gram per minute.
Claim 16
Dependent Claim
18 words
The film of claim 13 wherein said ethylene-vinyl acetate copolymer has a melting point of about 106° C.
Claim 17
Dependent Claim
56 words
The film of claim 13 wherein said ethylene vinyl acetate copolymer has a vinyl acetate content of between about 2.25 to about 3.0 percent by weight, based on the weight of said copolymer, a melt index of between about 0.2 to about 0.3 decigram per minute, and a density of about 0.917 gram per cubic centimeter.
Claim 18
Dependent Claim
20 words
The film of claim 13 wherein said film has a thickness of from about 1.5 mils to about 2.75 mils.
Claim 19
Dependent Claim
12 words
The film of claim 13 fabricated in the form of a bag.
Claim 20
Dependent Claim
154 words
A resin mixture comprising between about 80 and about 95 percent by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate content of from at least about 1.7 to about 4.5 percent by weight, based on the weight of said ethylene-vinyl acetate copolymer, and having a melt index of from about 0.15 to about 0.35 decigram per minute; and between about 5 and about 20 percent by weight, based on the weight of said resin mixture, of a polyethylene material selected from the group consisting of: (a) low pressure-high density polyethylene having a melt index of between about 0.15 and about 0.70 decigram per minute, and a density of between about 0.94 and about 0.96 gram per cubic centimeter, and (b) low pressure-low density polyethylene having a melt index of between about 0.3 and about 3.0 decigrams per minute, and a density of between about 0.915 and about 0.925 gram per cubic centimeter.
Claim 21
Dependent Claim
154 words
A resin mixture comprising between about 80 and about 95 percent by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate content of from at least about 1.7 to about 4.5 percent by weight, based on the weight of said ethylene-vinyl acetate copolymer, and having a melt index of from about 0.15 to about 0.35 decigram per minute; and between about 5 and about 20 percent by weight, based on the weight of said resin mixture, of a polyethylene material selected from the group consisting of: (a) low pressure-high density polyethylene having a melt index of between about 0.15 and about 0.70 decigram per minute, and a density of between about 0.94 and about 0.96 gram per cubic centimeter, and (b) low pressure-low density polyethylene having a melt index of between about 0.3 and about 3.0 decigrams per minute, and a density of between about 0.915 and about 0.925 gram per cubic centimeter.
Claim 22
Dependent Claim
41 words
A resin mixture as in claim 18 wherein said ethylene-vinyl acetate copolymer has a vinyl acetate content of between about 2.25 and about 3.0 percent by weight and a melt index of between about 0.20 and about 0.30 decigram per minute.
Claim 23
Dependent Claim
37 words
A resin mixture as in claim 18 wherein said low pressure-low density polyethylene is a copolymer formed from ethylene and a comonomer selected from the group consisting of butene, pentene, hexene, heptene and octene, and mixtures thereof.
Claim 24
Dependent Claim
26 words
A resin mixture as claimed in claim 18 wherein said polyethylene material comprises between about 10 and about 15 percent by weight of said resin mixture.
Claim 25
Dependent Claim
24 words
A resin mixture as in claim 20 wherein said copolymer has a melt index of between about 0.3 and about 3.0 decigrams per minute.
Claim 26
Dependent Claim
38 words
A resin mixture as in claim 20 wherein said copolymer has a melt index of between about 0.5 and about 2.0 decigrams per minute, and a density of between about 0.915 and about 0.920 gram per cubic centimeter.
Claim 27
Dependent Claim
43 words
A resin mixture as in claim 18 wherein said low pressure-low density polyethylene is a heterogeneous copolymer formed from ethylene, and at least one comonomer selected from the group consisting of propylene and butene-1, and at least one C 5 -C 8 comonomer.
Claim 28
Dependent Claim
38 words
A resin mixture as in claim 18 wherein said copolymer has a density of between about 0.91 and about 0.94 gram per cubic centimeter and a melt index of between about 0.3 and about 3.0 decigrams per minute.
Claim 29
Dependent Claim
38 words
A resin mixture as in claim 24 wherein said copolymer has a melt index of between about 0.5 and about 2.0 decigrams per minute, and a density of between about 0.915 and about 0.925 gram per cubic centimeter.
Claim 30
Dependent Claim
41 words
A resin mixture as in claim 18 wherein said low pressure-high density polyethylene has a melt index of between about 0.15 and about 0.3 decigram per minute, and a density of between about 0.945 and about 0.955 gram per cubic centimeter.
Claim 31
Dependent Claim
41 words
A resin mixture as in claim 27 wherein said low pressure-low density polyethylene has a melt index of between about 0.5 and about 2.0 decigrams per minute, and a density of between about 0.915 and about 0.920 gram per cubic centimeter.
Claim 32
Dependent Claim
145 words
A resin mixture comprising from about 85 to 90 percent by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate content of between about 1.7 and about 4.5 percent by weight of said copolymer, and having a melt index of between about 0.15 and about 0.35 decigram per minute; and between about 10 and about 15 percent by weight, based on the weight of said resin mixture, of a polyethylene material selected from the group consisting of: (a) low pressure-high density polyethylene having a melt index of between about 0.15 and about 0.70 decigram per minute, and a density of between about 0.94 and about 0.96 gram per cubic centimeter, and (b) low pressure-low density polyethylene having a melt index of between about 0.3 and about 3.0 decigrams per minute, and a density of between about 0.915 and about 0.925 gram per cubic centimeter.
Claim 33
Dependent Claim
145 words
A resin mixture comprising from about 85 to 90 percent by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate content of between about 1.7 and about 4.5 percent by weight of said copolymer, and having a melt index of between about 0.15 and about 0.35 decigram per minute; and between about 10 and about 15 percent by weight, based on the weight of said resin mixture, of a polyethylene material selected from the group consisting of: (a) low pressure-high density polyethylene having a melt index of between about 0.15 and about 0.70 decigram per minute, and a density of between about 0.94 and about 0.96 gram per cubic centimeter, and (b) low pressure-low density polyethylene having a melt index of between about 0.3 and about 3.0 decigrams per minute, and a density of between about 0.915 and about 0.925 gram per cubic centimeter.
Claim 34
Dependent Claim
20 words
A resin mixture as in claim 29 wherein said ethylene-vinyl acetate copolymer has a melting point of about 106° C.
Claim 35
Dependent Claim
58 words
A resin mixture as in claim 29 wherein said ethylene vinyl acetate copolymer has a vinyl acetate content of between about 2.25 to about 3.0 percent by weight, based on the weight of said copolymer, a melt index of between about 0.20 to about 0.30 decigram per minute, and a density of about 0.917 gram per cubic centimeter.
Claim 36
Dependent Claim
30 words
A resin mixture as in claim 29 wherein said mixture is in the form of an extruded film havig a thickness of from about 1.5 mils to about 2.75 mils.
Claim 37
Dependent Claim
18 words
A resin mixture as in claim 32 wherein said film is fabricated in the form of a bag.
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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) | 1987-05-08 | 1987-11-07 | 1988-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-08 | 1991-11-07 | 1992-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-08 | 1995-11-07 | 1996-05-08 | $7700.00 | Window Closed / Lapsed |