Patent EP0072258A2 successfully refreshed from Google Patents.
EP0072258A2
Expired / Lapsed
EP
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Adhesive dressing and components
Assignee: Smith and Nephew PLC
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Filing: 1982-08-12
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Granted: —
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Expires: 2002-08-12
Abstract
Abstract A flexible film suitable for use in adhesive medical dressings which film comprises a biend of polymers characterised in that the blend comprises a continuous matrix of 1.2 polybutadiene and an incompatible polymer which forms a discrete particulate phase within the continuous matrix and the film contains voids is described.
Inventors
- 👤 Peter Joseph Metcalfe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 23:10
CPC Classifications
B; B32; B32B; B32B25/00; B32B25/02; A; A61; A61F; A61F13/00; A61F13/02; A61F13/023; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/58; B32B25/16; B32B3/00; B32B3/26; B32B3/266; B32B7/00; B32B7/04; B32B7/12; C; C08; C08J; C08J5/00; C08J5/18; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/06; C08L9/00; B32B38/00; B32B38/0012; B32B2038/0028; B32B2264/00; B32B2264/02; B32B2264/0214; B32B2264/0228; B32B2264/0235; B32B2270/00; B32B2405/00; B32B2535/00; C08J2309/00; C08L2205/00; C08L2205/14; C08L2205/18; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249978
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
48 words
A flexible film suitable for use in adhesive medical dressings which film comprises a blend of polymers characterised in that the blend comprises a continuous matrix of 1,2 polybutadiene and an incompatible polymer which forms a discrete particulate phase within the continuous matrix and the film contains voids.
Claim 2
Dependent Claim
48 words
A flexible film suitable for use in adhesive medical dressings which film comprises a blend of polymers characterised in that the blend comprises a continuous matrix of 1,2 polybutadiene and an incompatible polymer which forms a discrete particulate phase within the continuous matrix and the film contains voids.
Claim 3
Dependent Claim
28 words
A film as claimed in claim 1 which is 50 microns to 150 microns thick and in which the voids have a diameter of 3 to 20 microns.
Claim 4
Dependent Claim
18 words
A film as claimed in either of claims 1 or 2 in which the incompatible polymer is polystyrene.
Claim 5
Dependent Claim
25 words
A film as claimed in any of claims 1 to 3 in which the 1,2 polybutadiene comprises 45% to 80% by weight of the film.
Claim 6
Dependent Claim
28 words
A film as claimed in any-of claims 1 to 4 which is adapted to have a moisture transmission rate of at least 200g/m2/24hrs/37°C/100% to 10% relative humidity difference.
Claim 7
Dependent Claim
31 words
A film as claimed in any of claims 1 to 4 which has apertures and has a moisture transmission rate of at least 500g/m 2 /24hrs./37°C/100% to 10% relative humidity difference.
Claim 8
Dependent Claim
29 words
An adhesive medical dressing which comprises a flexible backing film and an adhesive layer characterised in that the film is as claimed in any of claims 1 to 6.
Claim 9
Dependent Claim
23 words
An adhesive medical dressing as claimed in claim 7 in which the adhesive layer is a continuous layer of moisture vapour permeable adhesive.
Claim 10
Dependent Claim
19 words
An adhesive dressing as claimed'in either of claims 7 or 8 in sterile form and within a bacteria-proof package.
Claim 11
Dependent Claim
41 words
A process for preparing a flexible voided film as claimed in any of claims 1 to 6 which comprises forming a film from a blend of 1,2 polybutadiene and an incompatible polymer and stretching the film until the voids are formed.
References Cited (Backward Citations)
No citation records indexed.
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