Patent US4897274A successfully refreshed from Google Patents.
US4897274A
Expired / Lapsed
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Multi-layer highly moisture and gas permeable packaging film
Assignee: Cryovac LLC
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Filing: 1987-07-13
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Granted: 1990-01-30
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Expires: 2007-07-13
Abstract
Abstract A multi-layer highly moisture and gas permeable packaging film comprising a core layer of a butadiene-styrene copolymer with a styrene content of 60 to 80% by weight and at least two outer layers having heat sealable and gas permeability properties.
Inventors
- 👤 Giovanni Candida
- 👤 Luigi Perazzo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:50
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/28; B32B27/285; B32B27/30; B32B27/302; B32B27/306; B32B27/32; B32B27/36; B32B27/40; B65; B65D; B65D65/00; B65D65/38; B65D65/40; B65D85/00; B65D85/70; B65D85/72; B65D85/76; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/70; B32B2307/724; B32B2323/00; B32B2323/04; B32B2323/046; B32B2325/00; B32B2367/00; B32B2371/00; B32B2375/00; B32B2439/00; B32B2439/70; B32B2553/00; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1324; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31917; Y10T428/3192
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
107 words
A multilayer high permeability packaging film comprising: (a) two layers comprising a polymeric resin selected from the group consisting of (i) very low density polyethylene with a comonomer content of from 10% to 22% by weight of the very low density polyethylene, said comonomer selected from the group consisting of C 4 --, C 6 -- and C 8 -alpha-n-olefins, (ii) polybutylene and copolymers thereof, (iii) poly-4-methyl-pentene-1, (iv) polyethylene terephthalate glycol, (v) polyether, (vi) polyurethanes, and (vii) elastomeric copolyesters; and (b) a third layer disposed between the two layers and comprising butadiene-styrene copolymer with a styrene content of from 60% to 80% by weight of the copolymer.
Claim 2
Dependent Claim
107 words
A multilayer high permeability packaging film comprising: (a) two layers comprising a polymeric resin selected from the group consisting of (i) very low density polyethylene with a comonomer content of from 10% to 22% by weight of the very low density polyethylene, said comonomer selected from the group consisting of C 4 --, C 6 -- and C 8 -alpha-n-olefins, (ii) polybutylene and copolymers thereof, (iii) poly-4-methyl-pentene-1, (iv) polyethylene terephthalate glycol, (v) polyether, (vi) polyurethanes, and (vii) elastomeric copolyesters; and (b) a third layer disposed between the two layers and comprising butadiene-styrene copolymer with a styrene content of from 60% to 80% by weight of the copolymer.
Claim 3
Dependent Claim
226 words
A multilayer high permeability packaging film comprising (a) two layers comprising a polymeric resin selected from the group consisting of (i) very low density polyethylene with a comonomer content of from 10% to 22% by weight of the very low density polyethylene, said comonomer selected from the group consisting of C 4 --, C 6 -- and C 8 -alpha-n-olefins, (ii) polybutylene and copolymers thereof, (iii) poly-4-methyl-pentene-1, (iv) polyethylene terephthalate glycol, (v) polyether, (vi) polyurethanes, (vii) elastomeric copolyesters, and (viii) ethylene vinyl acetate copolymer; (b) a third layer disposed between the two layers and comprising butadiene-styrene copolymer with a styrene content of from 60% to 80% by weight of the copolymer; and (c) an additional layer between the third layer and at least one of the two layers, the additional layer comprising a polymeric material selected from the group consisting of (i) ethylene vinyl acetate copolymer with a vinyl acetate content of 8 to 28% by weight, (ii) very low density polyethylene containing a comonomer selected from the group consisting of C 4 --, C 6 -- and C 8 -alpha-n-olefins in an amount of 10% to 20% by weight of the very low density polyethylene, (iii) polybutylene and its copolymers, (iv) poly-4-methyl-pentene-1, (v) polyethylene terephthalate glycol, (vi) polyether, (vii) polyurethane, (viii) elastomeric copolyesters, (ix) adhesive modified ethylene vinyl acetate copolymer resins, and (x) ionomeric resins.
Claim 4
Dependent Claim
226 words
A multilayer high permeability packaging film comprising (a) two layers comprising a polymeric resin selected from the group consisting of (i) very low density polyethylene with a comonomer content of from 10% to 22% by weight of the very low density polyethylene, said comonomer selected from the group consisting of C 4 --, C 6 -- and C 8 -alpha-n-olefins, (ii) polybutylene and copolymers thereof, (iii) poly-4-methyl-pentene-1, (iv) polyethylene terephthalate glycol, (v) polyether, (vi) polyurethanes, (vii) elastomeric copolyesters, and (viii) ethylene vinyl acetate copolymer; (b) a third layer disposed between the two layers and comprising butadiene-styrene copolymer with a styrene content of from 60% to 80% by weight of the copolymer; and (c) an additional layer between the third layer and at least one of the two layers, the additional layer comprising a polymeric material selected from the group consisting of (i) ethylene vinyl acetate copolymer with a vinyl acetate content of 8 to 28% by weight, (ii) very low density polyethylene containing a comonomer selected from the group consisting of C 4 --, C 6 -- and C 8 -alpha-n-olefins in an amount of 10% to 20% by weight of the very low density polyethylene, (iii) polybutylene and its copolymers, (iv) poly-4-methyl-pentene-1, (v) polyethylene terephthalate glycol, (vi) polyether, (vii) polyurethane, (viii) elastomeric copolyesters, (ix) adhesive modified ethylene vinyl acetate copolymer resins, and (x) ionomeric resins.
Claim 5
Dependent Claim
25 words
A multilayer high permeability packaging film according to claims 1 or 2, having a moisture permeability value ranging from 100 to 400 g/m 2 day.
Claim 6
Dependent Claim
27 words
A highly moisture and gas permeable food package comprising a packaging film according to claims 1 or 2 wrapped around a food article and closed by sealing.
Claim 7
Dependent Claim
26 words
A package suitable for packaging molded rind cheese comprising a packaging film according to claims 1 or 2 wrapped around the cheese and closed by sealing.
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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) | 1993-01-29 | 1993-07-31 | 1994-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-29 | 1997-07-31 | 1998-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-29 | 2001-07-31 | 2002-01-30 | $7700.00 | Window Closed / Lapsed |