US5006187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plugged microporous film
Assignee: Freudenberg Nonwovens Ltd
•
Filing: 1989-06-15
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Granted: 1991-04-09
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Expires: 2009-06-15
Abstract
Abstract A method of making a plugged microporous film from a film which comprises a structural component having pores extending therethrough, and a plugging material within the pores, the method comprising: (a) selectively treating the plugging material so that its susceptibility to a crosslinking treatment differs from a first region of the film to a second region thereof; (b) crosslinking the plugging material at the second region of the film; and (c) removing the uncrosslinked plugging material from the first region of the film leaving plugs of crosslinked plugging material in the pores at the second region of the film.
Inventors
- 👤 John A. Cook
- 👤 Raymond W. Singleton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:26
CPC Classifications
A; A41; A41D; A41D31/00; A41D31/04; A41D31/10; A41D31/102; B; B01; B01D; B01D67/00; B01D67/0002; B01D67/0023; B01D67/003; B01D67/0081; B01D67/0088; B32; B32B; B32B3/00; B32B3/26; B32B38/00; B32B38/10; B32B5/00; B32B5/18; C; C08; C08J; C08J9/00; C08J9/26; C08J9/36; C08J9/40; C08J9/42; D; D06; D06N; D06N3/00; D06N3/0043; D06N7/00; B01D2325/00; B01D2325/38; B32B2038/0052; B32B2038/0076; B32B2307/00; B32B2307/70; B32B2307/726; B32B2307/7265; B32B2307/73; B32B2310/00; B32B2310/08; B32B2310/0806; B32B2310/0831; C08J2471/00; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249978; Y10T428/24998; Y10T442/00; Y10T442/30; Y10T442/3854; Y10T442/3878; Y10T442/3886
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
110 words
A method of making a plugged microporous film from a film which comprises a structural component having pores extending therethrough, and a plugging material within the pores, the method comprising: (a) selectively modifying the plugging material so that its susceptibility to a crosslinking treatment differs from a first region of the film to a second region thereof, the modification step comprising treatment of the film with a reagent; (b) crosslinking the plugging material at the second region of the film; and (c) removing the uncrosslinked plugging material from the first region of the film leaving plugs of crosslinked plugging material in the pores at the second region of the film.
Claim 2
Independent Claim
110 words
A method of making a plugged microporous film from a film which comprises a structural component having pores extending therethrough, and a plugging material within the pores, the method comprising: (a) selectively modifying the plugging material so that its susceptibility to a crosslinking treatment differs from a first region of the film to a second region thereof, the modification step comprising treatment of the film with a reagent; (b) crosslinking the plugging material at the second region of the film; and (c) removing the uncrosslinked plugging material from the first region of the film leaving plugs of crosslinked plugging material in the pores at the second region of the film.
Claim 3
Dependent Claim
28 words
A method as claimed in claim 1, in which the said reagent includes a composition which renders the plugging material at the second region of the film crosslinkable.
Claim 4
Dependent Claim
15 words
A method as claimed in claim 2, in which the composition comprises a crosslinking agent.
Claim 5
Dependent Claim
14 words
A method as claimed in claim 2, in which the composition comprises a photosensitiser.
Claim 6
Dependent Claim
18 words
A method as claimed in claim 1, in which the plugging material is crosslinked by exposure to radiation.
Claim 7
Dependent Claim
19 words
A method as claimed in claim 4, in which the plugging material is crosslinked by exposure to ultraviolet radiation.
Claim 8
Dependent Claim
49 words
A method as claimed in claim 1, in which at least one of the steps of modifying the plugging material and crosslinking the plugging material results in not more than 60% by weight of the initial weight of the plugging material remaining in the pores after the removal step.
Claim 9
Dependent Claim
33 words
A method as claimed in claim 1, in which the removal step comprises treating the film with a solvent in which the plugging material at the first region of the film is soluble.
Claim 10
Dependent Claim
18 words
A method as claimed in claim 1, in which the said regions of the film are laminate regions.
Claim 11
Dependent Claim
18 words
A method as claimed in claim 1, in which the said regions of the film are side-by-side regions.
Claim 12
Dependent Claim
30 words
A method as claimed in claim 1, which includes the step of forming the film by melt-processing a blend of the material of the structural component and the plugging material.
Claim 13
Dependent Claim
31 words
A method as claimed in claim 11, in which the blend comprises at least 35 parts by weight of plugging material per 65 parts of the material of the structural component.
Claim 14
Dependent Claim
45 words
A method as claimed in claim 1, which includes the step of laminating the film to a support member prior to removing the uncrosslinked plugging material from the first region of the film to cause the film and the support member to bond directly together.
Claim 15
Dependent Claim
24 words
A method as claimed in claim 13, in which the film and the support member are laminated with one another at an elevated temperature.
Claim 16
Dependent Claim
15 words
A method as claimed in claim 13, in which the support member is a fabric.
Claim 17
Dependent Claim
26 words
A method as claimed in claim 13, in which the film is laminated to the support member before the step of selectively modifying the plugging material.
Claim 18
Dependent Claim
18 words
A method as claimed in claim 11, in which the film is formed by extruding the said blend.
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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) | 1994-04-08 | 1994-10-08 | 1995-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-08 | 1998-10-08 | 1999-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-08 | 2002-10-08 | 2003-04-09 | $7700.00 | Window Closed / Lapsed |