US5043205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noiseless polymeric film, and containers for medical use made thereof
Assignee: Cryovac LLC
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Filing: 1989-07-20
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Granted: 1991-08-27
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Expires: 2009-07-20
Abstract
Abstract The film is formed by a composition comprising a mixture of 50-100 weight % of an ethylene-butyl-acrylate copolymer (EBA) having a content of butyl-acrylate (BA) of 5-50 weight %, and 0-50 weight % of an elastomeric polyolefin. Laminates comprising a layer constituted by said film have excellent characteristics of noiselessness and softness.
Inventors
- 👤 Luigi Perazzo
- 👤 Francesco Martini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:23
CPC Classifications
A; A61; A61L; A61L26/00; A61L26/0009; A61L26/0014; B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/32; C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0846; C08L23/0869; C08L23/16; B32B2307/00; B32B2307/10; B32B2307/102; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2439/00; B32B2439/80; C08L23/26; C08L23/28; C08L23/286; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
74 words
A multilayer film having characteristics of noiselessness, softness, and flexibility comprising: a) two outer layers comprising an olefinic polymer or copolymer; b) an intermediate layer comprising a polymeric material which functions as a gas barrier; and c) at least one of the outer layers consisting essentially of ethylene butyl acrylate copolymer having 5 to 50 weight % butyl acrylate, or a blend with up to 35% by weight of at least one elastomeric polyolefin.
Claim 2
Dependent Claim
74 words
A multilayer film having characteristics of noiselessness, softness, and flexibility comprising: a) two outer layers comprising an olefinic polymer or copolymer; b) an intermediate layer comprising a polymeric material which functions as a gas barrier; and c) at least one of the outer layers consisting essentially of ethylene butyl acrylate copolymer having 5 to 50 weight % butyl acrylate, or a blend with up to 35% by weight of at least one elastomeric polyolefin.
Claim 3
Dependent Claim
59 words
The multilayer film of claim 1 wherein the polymeric material which functions as a gas barrier is selected from the group consisting of: a) vinylidene chloride polymer; b) vinylidene chloride copolymer with comonomer selected from the group consisting of acrylic esters, acrylic acid, and vinyl chloride; c) ethylene vinyl alcohol copolymer; d) polyamides; and e) mixtures of these materials.
Claim 4
Dependent Claim
40 words
The multilayer film of claim 1 wherein the elastomeric polyolefin of at least one of the outer layers is a polymeric material selected from the group consisting of elastomeric polyolefin, ethylene propylene rubber, ethylene propylene diene rubber, and chlorinated polyethylene.
Claim 5
Dependent Claim
43 words
The multilayer film of claim 1 wherein at least one of the outer layers further comprises between about 0.1% and 5% by weight of at least one additive selected from the group consisting of antiblocking agents, flowing agents, plasticizers, stabilizers, and extrusion coadjutants.
Claim 6
Dependent Claim
39 words
The multilayer film of claim 1 wherein the film has a total thickness of between about 20 and 150 microns, and the layers containing the ethylene butyl acrylate copolymer constitute at least about 50% of the total film thickness.
Claim 7
Dependent Claim
11 words
The multilayer film of claim 1 wherein the film is coextruded.
Claim 8
Dependent Claim
91 words
A multilayer film having characteristics of noiselessness, softness, and flexibility comprising: a) two outer layers comprising an olefinic polymer or copolymer; b) an intermediate layer comprising a polymeric material which functions as a gas barrier; c) a binding polymeric layer disposed between and bonding the intermediate layer to each respective outer layer; and d) at least one of the outer layers consisting essentially of ethylene butyl acrylate copolymer having 5 to 50 weight % butyl acrylate, or a blend with up to 35% by weight of at least one elastomeric polyolefin.
Claim 9
Dependent Claim
91 words
A multilayer film having characteristics of noiselessness, softness, and flexibility comprising: a) two outer layers comprising an olefinic polymer or copolymer; b) an intermediate layer comprising a polymeric material which functions as a gas barrier; c) a binding polymeric layer disposed between and bonding the intermediate layer to each respective outer layer; and d) at least one of the outer layers consisting essentially of ethylene butyl acrylate copolymer having 5 to 50 weight % butyl acrylate, or a blend with up to 35% by weight of at least one elastomeric polyolefin.
Claim 10
Dependent Claim
59 words
The multilayer film of claim 7 wherein the polymeric material which functions as a gas barrier is selected from the group consisting of: a) vinylidene chloride polymer; b) vinylidene chloride copolymer with comonomer selected from the group consisting of acrylic esters, acrylic acid, and vinyl chloride; c) ethylene vinyl alcohol copolymer; d) polyamides; and e) mixtures of these materials.
Claim 11
Dependent Claim
34 words
The multilayer film of claim 7 wherein the binding layer is a polymeric material selected from the group consisting of ethylene butyl acrylate copolymer, ethylene vinyl acetate copolymer, and modified ethylene vinyl acetate copolymer.
Claim 12
Dependent Claim
40 words
The multilayer film of claim 7 wherein the elastomeric polyolefin of at least one of the outer layers is a polymeric material selected from the group consisting of elastomeric polyolefin, ethylene propylene rubber, ethylene propylene diene rubber, and chlorinated polyethylene.
Claim 13
Dependent Claim
43 words
The multilayer film of claim 7 wherein at least one of the outer layers further comprises between about 0.1% and 5% by weight of at least one additive selected from the group consisting of antiblocking agents, flowing agents, plasticizers, stabilizers, and extrusion coadjutants.
Claim 14
Dependent Claim
39 words
The multilayer film of claim 7 wherein the film has a total thickness of between about 20 and 150 microns, and the layers containing the ethylene butyl acrylate copolymer constitute at least about 50% of the total film thickness.
Claim 15
Dependent Claim
11 words
The multilayer film of claim 7 wherein the film is coextruded.
References Cited (Backward Citations)
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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) | 1994-08-26 | 1995-02-25 | 1995-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-26 | 1999-02-25 | 1999-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-26 | 2003-02-25 | 2003-08-27 | $7700.00 | Window Closed / Lapsed |