Patent US4599276A successfully refreshed from Google Patents.
US4599276A
Expired / Lapsed
US
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Heat-sterilizable laminate films
Assignee: Cryovac LLC
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Filing: 1984-10-22
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Granted: 1986-07-08
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Expires: 2004-10-22
Abstract
Abstract A heat-sterilizable laminate film especially useful for making disposible pouches for sterile injectable compositions comprises an ethylene-vinyl acetate copolymer layer and on either side of the said layer a layer of a propylene-ethylene copolymer which may contain an impact modifier. The laminate may be cross-linked by irradiation.
Inventors
- 👤 Francesco Martini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:22
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/30; B32B27/306; B32B27/06; B32B27/08; B32B27/18; B32B27/32; B32B7/00; B32B7/04; B32B7/12; A; A61; A61J; A61J1/00; A61J1/05; A61J1/10; B32B2305/00; B32B2305/72; B32B2307/00; B32B2307/30; B32B2307/308; B32B2439/00; B32B2439/80; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31928; Y10T428/31935
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
117 words
A heat sterilizable laminate consisting of a layer of an ethylene-vinyl acetate copolymer containing 18 to 40 percent by weight of vinyl acetate units said layer being substantially unoriented and, on each side of the said layer, a layer of 60 to 100 percent by weight of a propylene-ethylene copolymer containing 2 to 4.5 percent by weight of ethylene units, and 40 to 0 percent by weight of an impact modifier containing 30 to 63 parts by weight of an ethylene-propylene elastomer or ethylenepropylene-diene elastomer having an ethylene content of 55 to 70 weight percent and 70 to 37 parts by weight of a thermoplastic ethylene-vinyl acetate copolymer containing 9 to 40 percent of vinyl acetate units.
Claim 2
Dependent Claim
117 words
A heat sterilizable laminate consisting of a layer of an ethylene-vinyl acetate copolymer containing 18 to 40 percent by weight of vinyl acetate units said layer being substantially unoriented and, on each side of the said layer, a layer of 60 to 100 percent by weight of a propylene-ethylene copolymer containing 2 to 4.5 percent by weight of ethylene units, and 40 to 0 percent by weight of an impact modifier containing 30 to 63 parts by weight of an ethylene-propylene elastomer or ethylenepropylene-diene elastomer having an ethylene content of 55 to 70 weight percent and 70 to 37 parts by weight of a thermoplastic ethylene-vinyl acetate copolymer containing 9 to 40 percent of vinyl acetate units.
Claim 3
Dependent Claim
41 words
A laminate according to claim 1 consisting of the said layer of an ethylene-vinyl acetate copolymer having on each side a layer of the said propylene-ethylene copolymer containing no impact modifier, the polymers of the said laminate being cross-linked by irradiation.
Claim 4
Dependent Claim
43 words
A laminate according to claim 1 consisting of five layers, namely a core layer of the said ethylene-vinyl acetate copolymer, two outer layers of the said propylene-ethylene copolymer, and two layers of adhesive between the said outer layers and the said core layer.
Claim 5
Dependent Claim
60 words
A laminate according to any one of claims 2 and 3 in which the said ethylene-vinyl acetate copolymer contains 18 to 30 percent by weight of vinyl acetate units and has a melt flow index of 0.7 to 7 g/10 mins., a density of 0.930 to 0.970 g/cm 3 , and a Vicat softening point of 40° to 80° C.
Claim 6
Dependent Claim
46 words
A laminate according to any one of claims 1, 2, and 3 in which the propylene-ethylene copolymer has a melt flow index of 3 to 7 g/10 mins., a density of 0.890 to 0.910 g/cm 3 , and a Vicat softening point 120° to 130° 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) | 1989-07-07 | 1990-01-06 | 1990-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-07 | 1994-01-06 | 1994-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-07 | 1998-01-06 | 1998-07-08 | $7700.00 | Window Closed / Lapsed |