Patent US726026A successfully refreshed from Google Patents.
Patent EP0141592A2 successfully refreshed from Google Patents.
EP0141592A2
Expired / Lapsed
EP
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Polymer blend films
Assignee: Smith and Nephew PLC
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Filing: 1984-10-19
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Granted: —
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Expires: 2004-10-19
Abstract
Abstract A moisture vapour transmitting elastomeric film which comprises a blend of incompatible polymers and contains voids characterised in that the blend comprises a continuous matrix of ethylene vinyl acetate within which the incompatible polymer forms a discrete particulate phase matrix, processes for the preparation thereof and articles comprising these films are described.
Inventors
- 👤 Peter Joseph Metcalfe
- 👤 Andrew James Carter
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 20:29
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/225; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0846; C08L23/0853; C08J2331/00; C08J2331/02; C08J2331/04; C08L25/00; C08L25/02; C08L25/04; C08L25/06; Y; Y10; Y10S; Y10S602/00; Y10S602/90; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/249921; Y10T428/249953; Y10T428/249955; Y10T428/249958; Y10T428/249978; Y10T428/249987; Y10T428/249991
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
39 words
A moisture vapour transmitting elastomeric film which comprises a blend of incompatible polymers and contains voids characterised in that the blend comprises a continuous matrix of ethylene vinyl acetate within which the incompatible polymer forms a discrete particulate phase.
Claim 2
Dependent Claim
39 words
A moisture vapour transmitting elastomeric film which comprises a blend of incompatible polymers and contains voids characterised in that the blend comprises a continuous matrix of ethylene vinyl acetate within which the incompatible polymer forms a discrete particulate phase.
Claim 3
Dependent Claim
15 words
A film as claimed in claim 1 which is employed in a in wound dressing.
Claim 4
Dependent Claim
41 words
A film as claimed in either of claims 1 or 2 which is liquid water impermeable and has a moisture vapour transmission rate of at least 500g/m 2 /24 hours at 37 0 C at 100% to 20% relative humidity difference.
Claim 5
Dependent Claim
14 words
A film as claimed in either of claims 1 or 2 which is apertured.
Claim 6
Dependent Claim
33 words
A film as claimed in claim 4 which is in the form of a net and in which the area of apertures is 10% to 50% of the total area of the film.
Claim 7
Dependent Claim
27 words
A film as claimed in any of claims 1 to 5 in which the polymer blend contains 40% to 90% by weight of ethylene vinyl acetate copolymer.
Claim 8
Dependent Claim
18 words
A film as claimed in any of claims 1 to 6 in which the incompatible polymer comprises polystyrene.
Claim 9
Dependent Claim
14 words
An article for bodily contact which comprises a film of claims 1 to 7.
Claim 10
Dependent Claim
12 words
An article as claimed in claim 8 which is a wound dressing.
Claim 11
Dependent Claim
44 words
A process for making a film as claimed in claims 1 to 7 which comprises forming a film from a blend of ethylene vinyl acetate copolymer and an incompatible polymer, cold drawing the film until voiding occurs and allowing the drawn film to contract.
Claim 12
Dependent Claim
52 words
A process as claimed in claim 10 for making an apertured film as claimed in claims 4 and 5 which comprises forming a film having thicker and thinner areas from a blend of ethylene vinyl acetate copolymer and an incompatible polymer and stretching the film until apertures form in the thinner areas.
References Cited (Backward Citations)
No citation records indexed.
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