US3853601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrophilic microporous film
Assignee: Celanese Corp
•
Filing: 1972-04-18
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Granted: 1974-12-10
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Expires: 1992-04-18
Abstract
Abstract A hydrophobic microporous film comprising a hydrophilic microporous film and a surfactant coating of a silicon glycol copolymer which renders the coated microporous film hydrophilic. The hydrophilic microporous film of the instant invention more rapidly ''''wets'''' than microporous films of the prior art. A second surfactant, preferably an imidazoline tertiary amine, may also be included in the surfactant coating. The hydrophilic microporous film has particular application as a battery separator which must be rapidly ''''wetted'''' to generate its electrical output.
Inventors
- 👤 H Taskier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:04
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/40; H01M50/409; H01M50/449; H01M50/489; H01M50/491; H01M50/411; H01M50/414; H01M50/417; H01M50/423; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249978; Y10T428/249979
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
73 words
A HYDROPHILIC MICROPOROUS FILM COMPRISING A HYDROPHOBIC MICROPOROUS POLYMERIC FILM CHARACTERIZED BY HAVING A REDUCED BULK DENSITY AS COMPARED TO THE BULK DENSITY OF THE CORRESPONDING PRECURSOR FILM, A CRYSTALLINITY OF ABOUT 30 PERCENT, AN AVERAGE PORE SIZE OF ABOUT 100 TO 12,000 ANGSTROMS AND A SURFACE AREA OF ABOUT 2 TO ABOUT 200 SQUARE METERS PER GRAM COATED WITH A SURFACTANT COMPRISING A SILICON GLYCOL COPOLYMER WHICH RENDERS SAID HYDROPHOBIC FILM HYDROPHILIC.
Claim 2
Dependent Claim
73 words
A HYDROPHILIC MICROPOROUS FILM COMPRISING A HYDROPHOBIC MICROPOROUS POLYMERIC FILM CHARACTERIZED BY HAVING A REDUCED BULK DENSITY AS COMPARED TO THE BULK DENSITY OF THE CORRESPONDING PRECURSOR FILM, A CRYSTALLINITY OF ABOUT 30 PERCENT, AN AVERAGE PORE SIZE OF ABOUT 100 TO 12,000 ANGSTROMS AND A SURFACE AREA OF ABOUT 2 TO ABOUT 200 SQUARE METERS PER GRAM COATED WITH A SURFACTANT COMPRISING A SILICON GLYCOL COPOLYMER WHICH RENDERS SAID HYDROPHOBIC FILM HYDROPHILIC.
Claim 3
Dependent Claim
19 words
A hydrophilic film in accordance with claim 1 wherein said silicon glycol copolymer surfactant is a polyoxyethylene polymethyl siloxane.
Claim 4
Dependent Claim
17 words
A hydrophilic film in accordance with claim 1 wherein said surfactant coating includes a second surfactant component.
Claim 5
Dependent Claim
18 words
A hydrophilic film in accordance with claim 3 wherein said second surfactant component is an imidazoline tertiary amine.
Claim 6
Dependent Claim
25 words
A hydrophilic coated film in accordance with claim 1 wherein said surfactant coating represents 2 to 20 percent by weight of the uncoated microporous film.
Claim 7
Dependent Claim
21 words
A hydrophilic film in accordance with claim 1 wherein said microporous film has a pore size no greater than 5000 Angstroms.
Claim 8
Dependent Claim
28 words
A hydrophilic film in accordance with claim 1 wherein said microporous film is further characterized by a void volume in the range of about 20 to 45 percent.
Claim 9
Dependent Claim
37 words
A hydrophilic film in accordance with claim 7 wherein the microporous film has a surface area in the range of about 20 and 60 square meters per gram and a crystallinity of between 30 and 70 percent.
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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) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |