US4798604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contoured film
Assignee: Accantia Holdings Ltd
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Filing: 1986-08-26
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Granted: 1989-01-17
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Expires: 2006-08-26
Abstract
Abstract PCT No. PCT/GB86/00504 Sec. 371 Date Apr. 15, 1987 Sec. 102(e) Date Apr. 15, 1987 PCT Filed Aug. 26, 1986 PCT Pub. No. WO87/01029 PCT Pub. Date Feb. 26, 1987.A water permeable, contoured, polymeric film which is apertured and which contains a pattern of raised areas. The film is formed from elastomeric polymer, preferably a blend of ethylene-vinyl acetate copolymer with incompatible polymer. The numbers of apertures and raised areas contained in the film are such that the ratio of apertures to raised areas is greater than unity. The apertures are preferably distributed in a random manner throughout the raised areas. Processes for forming the film by first aperturing the film and then impressing raised areas into the apertured film are also described. The film may be employed to form the body contacting surface in absorbent devices. The use of the film helps to reduce the phenomenon of wet-back.
Inventors
- 👤 Andrew J. Carter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:51
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/51; A61F13/511; A61F13/512; A61F13/15577; A61F13/513; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/225; B; B29; B29C; B29C59/00; B29C59/02; B29C59/022; C; C08; C08J; C08J5/00; C08J5/18
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
44 words
A water permeable, contoured polymeric film which comprises a film containing apertures and which has a pattern of raised areas therein, in which the film is formed from elastomeric polymer and in which the ratio of apertures to raised areas is greater than unity.
Claim 2
Dependent Claim
44 words
A water permeable, contoured polymeric film which comprises a film containing apertures and which has a pattern of raised areas therein, in which the film is formed from elastomeric polymer and in which the ratio of apertures to raised areas is greater than unity.
Claim 3
Dependent Claim
20 words
A film according to claim 1 in which the apertures are described in a random manner throughout the raised areas.
Claim 4
Dependent Claim
21 words
A film as claimed in either of claims 1 or 2 in which each raised area contains at least one aperture.
Claim 5
Dependent Claim
19 words
A film according to claim 3 in which the ratio of apertures to rasied areas is greater than 2.
Claim 6
Dependent Claim
30 words
A film according to claim 4 in which the film contains from 4 to 30 raised areas per sq. cm and each raised area contains from 2 to 4 apertures.
Claim 7
Dependent Claim
35 words
A film according to claim 1 in which the film contains from 8 to 120 apertures per sq. cm and has an open area comprising from 5% to 50% of the area of the film.
Claim 8
Dependent Claim
22 words
A film according to claim 1 in which the area of each aperture is from 0.1 sq. mm to 1 sq. mm.
Claim 9
Dependent Claim
20 words
A film according to claim 1 in which the thickness of the contoured film is from 0.2 to 3 mm.
Claim 10
Dependent Claim
20 words
A film according to claim 1 in which the elastomeric polymer has a recoverable elastic strain of at least 25%.
Claim 11
Dependent Claim
36 words
A film according to claim 1 in which the elastomeric polymer is a blend of from 40 to 90 parts by weight of ethylene-vinyl acetate copolymer with 60 to 10 parts by weight of incompatible polymer.
Claim 12
Dependent Claim
69 words
An absorbent device for body fluids comprising absorbent material and a body facing surface wherein at least a portion of the body facing surface comprises a water permeable, contoured polymeric film which comprises a film containing apertures and which has a pattern of raised areas therein, in which the film is formed from elastomeric polymer and in which the ratio of apertures to raised areas is greater than unity.
Claim 13
Dependent Claim
69 words
An absorbent device for body fluids comprising absorbent material and a body facing surface wherein at least a portion of the body facing surface comprises a water permeable, contoured polymeric film which comprises a film containing apertures and which has a pattern of raised areas therein, in which the film is formed from elastomeric polymer and in which the ratio of apertures to raised areas is greater than unity.
Claim 14
Dependent Claim
16 words
An absorbent device according to claim 11 which is in the form of a sanitary napkin.
Claim 15
Dependent Claim
86 words
A process for the preparation of a water permeable, contoured film formed from elastomeric polymer which film contains apertures and has a pattern of raised areas therein, which process comprises forming apertures in a film of the elastomeric polymer and then compressing the apertured film against a pattern of raised and/or depressed areas whereby a pattern of raised areas is impressed in the apertured film, the number of apertures and raised areas being such that the ratio of apertures to raised areas is greater than unity.
Claim 16
Dependent Claim
86 words
A process for the preparation of a water permeable, contoured film formed from elastomeric polymer which film contains apertures and has a pattern of raised areas therein, which process comprises forming apertures in a film of the elastomeric polymer and then compressing the apertured film against a pattern of raised and/or depressed areas whereby a pattern of raised areas is impressed in the apertured film, the number of apertures and raised areas being such that the ratio of apertures to raised areas is greater than unity.
Claim 17
Dependent Claim
16 words
A process according to claim 13 in which the apertures are formed using a pin mould.
Claim 18
Dependent Claim
36 words
A process according to claim 13 in which the film after being apertured is compressed between a roller which carries a pattern of raised areas on its surface and a smooth roller having a resilient surface.
Claim 19
Dependent Claim
33 words
A process according to claim 13 in which the film after being apertured is compressed between a pair of rollers which have an intermeshing pattern of raised and depressed areas on their surface.
Claim 20
Dependent Claim
24 words
An absorbent device according to claim 11 in which the whole of the body facing surface of the device comprises a contoured apertured film.
Claim 21
Dependent Claim
24 words
An absorbent device according to claim 11 in which the apertures are distributed in a random manner throughout the raised areas of the film.
Claim 22
Dependent Claim
20 words
An absorbent device according to claim 11 in which each raised area of the film contains at least one aperture.
Claim 23
Dependent Claim
23 words
An absorbent device according to claim 19 in which the ratio of apertures to raised areas in the film is greater than 2.
Claim 24
Dependent Claim
31 words
An absorbent device according to claim 20 in which the film contains from 4 to 30 raised areas per sq. cm and each raised area contains from 2 to 4 apertures.
Claim 25
Dependent Claim
36 words
An absorbent device according to claim 11 in which the film contains from 8 to 120 apertures per sq. cm and has an open area comprising from 5% to 50% of the area of the film.
Claim 26
Dependent Claim
23 words
An absorbent device according to claim 11 in which the area of each aperture is from 0.1 sq. mm to 1 sq. mm.
Claim 27
Dependent Claim
21 words
An absorbent device according to claim 11 in which the thickness of the contoured film is from 0.2 to 3 mm.
Claim 28
Dependent Claim
21 words
An absorbent device according to claim 11 in which the elastomeric polymer has a recoverable elastic strain of at least 25%.
Claim 29
Dependent Claim
37 words
An absorbent device according to claim 11 in which the elastomeric polymer is a blend of from 40 to 90 parts by weight of ethylene-vinyl acetate copolymer with 60 to 10 parts by weight of incompatible polymer.
Claim 30
Dependent Claim
70 words
An absorbent device for body fluids comprising absorbent material and a body facing surface wherein at least a portion of the body facing surface comprises a water permeable, contoured polymeric film which comprises a film containing apertures and which has a pattern of raised areas therein, in which the film is formed from elastomeric polymer and in which the ratio of apertures to raised areas is from 2 to 8.
Claim 31
Dependent Claim
70 words
An absorbent device for body fluids comprising absorbent material and a body facing surface wherein at least a portion of the body facing surface comprises a water permeable, contoured polymeric film which comprises a film containing apertures and which has a pattern of raised areas therein, in which the film is formed from elastomeric polymer and in which the ratio of apertures to raised areas is from 2 to 8.
Claim 32
Dependent Claim
15 words
An absorbent device according to claim 11 which is in the form of a diaper.
Claim 33
Dependent Claim
77 words
An absorbent device according to claim 11 which is in the form of a surgical dressing which comprises an absorbent and a surface which in use contacts the skin wherein the surface comprises a water permeable, contoured polymeric film which comprises a film containing apertures and which has a pattern of raised areas therein, in which the film is formed from elastomeric polymer and in which the ratio of apertures to raised areas is greater than unity.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-17 | 1992-07-18 | 1993-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-17 | 1996-07-18 | 1997-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-17 | 2000-07-18 | 2001-01-17 | $7700.00 | Window Closed / Lapsed |