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Patent US4876146A successfully refreshed from Google Patents.
US4876146A
Expired / Lapsed
US
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Anti-fogging multilayered film and bag produced therefrom for packaging vegetables and fruits
Assignee: Toyobo Co Ltd
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Filing: 1987-04-29
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Granted: 1989-10-24
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Expires: 2007-04-29
Abstract
Abstract An anti-fogging multilayered film suitable for packaging fresh vegetables and fruits comprising a base layer and at least one surface layer containing an anti-fogging agent, said film having a water vapor transmission of 15 to 200 g/m 2 ·24 hrs·40° C., an oxygen permeability of 3,000 to 35,000 cc/m 2 ·24 hr·atm·20° C.·90% RH, and a carbon dioxide permeability of 12,000 to 130,000 cc/m 2 ·24 hr·20°C.·90% RH, and said anti-fogging surface layer having heat sealing properties. A packaging bag produced from this film is also disclosed.
Inventors
- 👤 Tsutomu Isaka
- 👤 Saburo Ohta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:07
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/18; B32B2307/00; B32B2307/30; B32B2307/31; B32B2439/00; B32B2439/40; B32B2439/70; B32B2553/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/1341; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31935; Y10T428/31938
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
138 words
A biaxially oriented anti-fogging, multi-layered film comprising a base layer and at least one surface layer containing an anti-fogging agent, said film having a water vapour transmission of 15 to 200 g/m 2 ·24 hr·40° C., an oxygen permeability of 3,000 to 35,000 cc/m 2 ·24 hr·atm·20° C.·90% RH, and a carbon dioxide permeability of 12,000 to 130,000 cc/m 2 ·24 hr atm·20° C.·90% RH, said anti-fogging surface layer having heat sealing properties such that the film shows a side welding seal strength of at least 3.0 kg·cm/15 mm when side welding seal is carried out at 270° C., and at least one surface layer of said film showing an anti-fogging property when exposed to two cycles of temperature rise and drop between 20° C. and 40° C., the temperature rises and drops occurring at 6 hour intervals.
Claim 2
Dependent Claim
138 words
A biaxially oriented anti-fogging, multi-layered film comprising a base layer and at least one surface layer containing an anti-fogging agent, said film having a water vapour transmission of 15 to 200 g/m 2 ·24 hr·40° C., an oxygen permeability of 3,000 to 35,000 cc/m 2 ·24 hr·atm·20° C.·90% RH, and a carbon dioxide permeability of 12,000 to 130,000 cc/m 2 ·24 hr atm·20° C.·90% RH, said anti-fogging surface layer having heat sealing properties such that the film shows a side welding seal strength of at least 3.0 kg·cm/15 mm when side welding seal is carried out at 270° C., and at least one surface layer of said film showing an anti-fogging property when exposed to two cycles of temperature rise and drop between 20° C. and 40° C., the temperature rises and drops occurring at 6 hour intervals.
Claim 3
Dependent Claim
44 words
A film according to claim 1, wherein the surface layer having heat sealing property is mainly composed of a polymer selected from the group consisting of a homopolymer or copolymer of α-olefins having a melting point of 80° to 155° C. and mixtures thereof.
Claim 4
Dependent Claim
18 words
A film according to claim 2, wherein α-olefin is selected from those having 2 to 10 carbon atoms.
Claim 5
Dependent Claim
27 words
A film according to claim 2, wherein the surface layer is mainly composed of a random or block copolymer of α-olefins having 2 to 10 carbon atoms.
Claim 6
Dependent Claim
96 words
A film according to claim 1, wherein the base layer comprises a mixture of (a) 30 to 90% by weight of a polymer or copolymer of one or more α-olefins having 2 to 10 carbon atoms and (b) 10 to 70% by weight of one or more copolymers which contain one or more monomer units selected from the group consisting of vinyl acetate, acrylic acid and styrene in an amount of 5 to 80% by weight, and other copolymerizable monomer units in an amount of 95 to 20% by weight based on the total constituent components.
Claim 7
Dependent Claim
29 words
A film according to claim 1, wherein the anti-fogging agent is contained in an amount of 0.3 to 3% by weight based on the total weight of the film.
Claim 8
Dependent Claim
30 words
A film according to claim 1, wherein the anti-fogging agent is contained at least in one surface layer of the film in an amount of 0.3 to 3% by weight.
Claim 9
Dependent Claim
45 words
A film according to claim 1, wherein at least one surface layer of the film shows an anti-fogging property when exposed to two cycles of temperature rise and drop between 0° C. and 40° C, the temperature rises and drops occurring at 6 hour intervals.
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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) | 1992-10-23 | 1993-04-24 | 1993-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-23 | 1997-04-24 | 1997-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-23 | 2001-04-24 | 2001-10-24 | $7700.00 | Window Closed / Lapsed |