US4559938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adhesive dressing and components
Assignee: Smith and Nephew PLC
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Filing: 1982-08-11
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Granted: 1985-12-24
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Expires: 2002-08-11
Abstract
Abstract A flexible film suitable for use in adhesive medical dressings which film comprises a blend of polymers characterized 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 J. Metcalfe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:53
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/02; A61F13/023; B; B32; B32B; B32B25/00; B32B25/02; 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: 17
Claim 1
Independent Claim
57 words
A flexible film suitable for use in adhesive medical dressings which film comprises a blend of polymers which 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 whereby said voids provide means for moisture vapor transmission but not liquid permeability.
Claim 2
Dependent Claim
57 words
A flexible film suitable for use in adhesive medical dressings which film comprises a blend of polymers which 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 whereby said voids provide means for moisture vapor transmission but not liquid permeability.
Claim 3
Dependent Claim
27 words
A film according to 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
13 words
A film according to claim 1 in which the incompatible polymer is polystyrene.
Claim 5
Dependent Claim
20 words
A film according to claim 1 in which the 1,2 polybutadiene comprises 45% to 80% by weight of the film.
Claim 6
Dependent Claim
30 words
A film according to claim 1 which is adapted to have a moisture vapour transmission rate of at least 200 g/m 2 /24 hours/37° C./100% to 10% relative humidity difference.
Claim 7
Dependent Claim
29 words
A film according to claim 1 which has apertures and has a moisture transmission rate of at least 500 g/m 2 /24 hours/37° C./100% to 10% relative humidity difference.
Claim 8
Dependent Claim
20 words
An adhesive medical dressing which comprises a flexible backing film of claim 1 on which is disposed an adhesive layer.
Claim 9
Dependent Claim
22 words
An adhesive medical dressing according to claim 7 in which the adhesive layer is a continuous layer of moisture vapour permeable adhesive.
Claim 10
Dependent Claim
15 words
An adhesive dressing according to claim 7 in sterile form and within a bacteria-proof package.
Claim 11
Dependent Claim
36 words
A process for preparing a flexible voided film according to claim 1 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.
Claim 12
Dependent Claim
15 words
A film according to claim 1 wherein the 1,2 polybutadiene is a thermoplastic 1,2 polybutadiene.
Claim 13
Dependent Claim
35 words
A film according to claim 11 wherein the thermoplastic 1,2 polybutadiene contains a major amount of syndiotactic 1,2 polybutadiene having a crystallinity of 15% to 30% and an average molecular weight in excess of 100,000.
Claim 14
Dependent Claim
32 words
A film according to claim 1 wherein the particles of the discrete particulate phase of incompatible polymer are spherical or ellipsoidal in shape and have a diameter of at least 1 micron.
Claim 15
Dependent Claim
20 words
An adhesive medical dressing which comprises a flexible backing film of claim 11 on which is disposed an adhesive layer.
Claim 16
Dependent Claim
20 words
An adhesive medical dressing which comprises a flexible backing film of claim 12 on which is disposed an adhesive layer.
Claim 17
Dependent Claim
20 words
An adhesive medical dressing which comprises a flexible backing film of claim 13 on which is disposed an adhesive layer.
References Cited (Backward Citations)
US3426754A
Cited
US3801692A
Cited
US3932682A
Cited
US4133310A
Cited
GB1454870A
Cited
US4135021A
Cited
GB2081721A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-23 | 1989-06-24 | 1989-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-23 | 1993-06-24 | 1993-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-23 | 1997-06-24 | 1997-12-24 | $7700.00 | Window Closed / Lapsed |