US3900635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayer shrinkable film for poultry bags
Assignee: Union Carbide Corp
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Filing: 1972-02-22
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Granted: 1975-08-19
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Expires: 1992-02-22
Abstract
Abstract A multilayer shrinkable film is disclosed. The film is suitable for use in fabricating bags for frozen poultry. The film comprises: A. A BIAXIALLY ORIENTED FIRST LAYER COMPRISING A FIRST ETHYLENE POLYMER SELECTED FROM THE GROUP CONSISTING OF ETHYLENE HOMOPOLYMER HAVING A DENSITY NOT GREATER THAN ABOUT 0.93, AND ETHYLENE COPOLYMER, SAID FIRST ETHYLENE POLYMER HAVING A MELT INDEX OF LESS THAN ABOUT 2.3; AND B. A BIAXIALLY ORIENTED SECOND LAYER COMPRISING A BLEND OF AN IONOMER AND A SECOND ETHYLENE POLYMER, SAID SECOND ETHYLENE POLYMER BEING SELECTED FROM THE GROUP CONSISTING OF ETHYLENE HOMOPOLYMER HAVING A DENSITY NOT GREATER THAN ABOUT 0.93, AND ETHYLENE COPOLYMER; WHEREIN EACH LAYER CONSTITUTES AS LEAST ABOUT 20 PERCENT OF THE TOTAL THICKNESS OF SAID FILM.
Inventors
- 👤 Jr James O Funderburk
- 👤 Stephen J Vicik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:07
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/306; B32B27/308; B32B27/32; B32B2250/00; B32B2250/02; B32B2250/24; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/518; B32B2307/70; B32B2307/732; B32B2307/734; B32B2307/736; B32B2323/00; B32B2323/04; B32B2331/00; B32B2331/04; B32B2333/00; B32B2333/04; B32B2439/00; B32B2439/70; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24992; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
142 words
A MULTILAYER HEAT-SHRINKABLE FILM HAVING A SHRINKAGE OF AT LEAST 25 PERCENT IN THE TRANSVERSE DIRECTION AT A TEMPERATURE OF ABOUT 90*C., AND BEING SUITABLE FOR USE IN FABRICATING BAGS FOR FROZEN POULTRY, SAID FILM CONSISTING ESSENTIALLY OF: A. A BIAXIALLY ORIENTED FIRST LAYER COMPRISING A FIRST ETHYLENE POLYMER SELECTED FROM THE GROUP CONSISTING OF ETHYLENE HOMOPOLYMER HAVING A DENSITY NOT GREATER THAN ABOUT 0.93, AND ETHYLENE COPOLYMER, SAID FIRST ETHYLENE POLYMER HAVING A MELT INDEX OF LESS THAN ABOUT 2,3: AND B. A BIAXIALLY ORIENTED SECOND LAYER COMPRISING A BLENT OF AN IONOMER AND A SECOND ETHYLENE POLYMER, SAID SECOND ETHYLENE POLYMER BEING SELECTED FROM THE GROUP CONSISTING OF ETHYLENE HOMOPOLYMER HAVING A DENSITY NOT GREATER THAN ABOUT 0.93, AND ETHYLENE COPOLYMER: WHEREIN EACH LAYER CONSISTUTES FROM ABOUT 20 PERCENT TO ABOUT 80 PERCENT OF THE TOTAL THICKNESS OF SAID FILM.
Claim 2
Dependent Claim
142 words
A MULTILAYER HEAT-SHRINKABLE FILM HAVING A SHRINKAGE OF AT LEAST 25 PERCENT IN THE TRANSVERSE DIRECTION AT A TEMPERATURE OF ABOUT 90*C., AND BEING SUITABLE FOR USE IN FABRICATING BAGS FOR FROZEN POULTRY, SAID FILM CONSISTING ESSENTIALLY OF: A. A BIAXIALLY ORIENTED FIRST LAYER COMPRISING A FIRST ETHYLENE POLYMER SELECTED FROM THE GROUP CONSISTING OF ETHYLENE HOMOPOLYMER HAVING A DENSITY NOT GREATER THAN ABOUT 0.93, AND ETHYLENE COPOLYMER, SAID FIRST ETHYLENE POLYMER HAVING A MELT INDEX OF LESS THAN ABOUT 2,3: AND B. A BIAXIALLY ORIENTED SECOND LAYER COMPRISING A BLENT OF AN IONOMER AND A SECOND ETHYLENE POLYMER, SAID SECOND ETHYLENE POLYMER BEING SELECTED FROM THE GROUP CONSISTING OF ETHYLENE HOMOPOLYMER HAVING A DENSITY NOT GREATER THAN ABOUT 0.93, AND ETHYLENE COPOLYMER: WHEREIN EACH LAYER CONSISTUTES FROM ABOUT 20 PERCENT TO ABOUT 80 PERCENT OF THE TOTAL THICKNESS OF SAID FILM.
Claim 3
Dependent Claim
68 words
The film of claim 1 wherein said first ethylene polymer is ethylene homopolymer, ethylene/vinyl acetate copolymer, ethylene/acrylic acid copolymer, ethylene/methacrylic acid copolymer, ethylene/alkyl acrylate copolymer, or ethylene/alkyl methacrylate copolymer, wherein said second ethylene polymer is ethylene homopolymer, ethylene/vinyl acetate copolymer, ethylene/acrylic acid copolymer, ethylene/methacrylic acid copolymer, ethylene/alkyl acrylate copolymer, or ethylene/alkyl methacrylate copolymer, and wherein said second ethylene polymer has a melt index of less than about 10.
Claim 4
Dependent Claim
36 words
The film of claim 1 wherein said first ethylene polymer is ethylene homopolymer, wherein said second ethylene polymer is ethylene homopolymer, and wherein said second ethylene polymer has a melt index of less than about 10.
Claim 5
Dependent Claim
24 words
The film of claim 1 wherein each of said ethylene copolymers is a copolymer of ethylene and vinyl acetate, ethyl acrylate, or acrylic acid.
Claim 6
Dependent Claim
22 words
The film of claim 2 wherein said ionomer is a copolymer of ethylene with a salt of acrylic acid or methacrylic acid.
Claim 7
Dependent Claim
16 words
The film of claim 5 wherein the cation of said salt is alkali metal or zinc.
Claim 8
Dependent Claim
11 words
The film of claim 6 wherein said alkali metal is sodium.
Claim 9
Dependent Claim
21 words
The film of claim 2 wherein said ionomer constitutes from about 1 to about 60 weight percent of said second layer.
Claim 10
Dependent Claim
21 words
The film of claim 2 wherein said ionomer constitutes from about 5 to about 40 weight percent of said second layer.
Claim 11
Dependent Claim
21 words
The film of claim 2 wherein said ionomer constitutes from about 10 to about 30 weight percent of said second layer.
Claim 12
Dependent Claim
19 words
The film of claim 2 wherein the thickness of said film is from about 1.5 to about 3 mils.
Claim 13
Dependent Claim
22 words
The film of claim 3 wherein said ionomer is a copolymer of ethylene with a salt of acrylic acid or methacrylic acid.
Claim 14
Dependent Claim
16 words
The film of claim 12 wherein the cation of said salt is alkali metal or zinc.
Claim 15
Dependent Claim
10 words
The film of claim 13 wherein said cation is zinc.
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) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |