US4717479A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrophilized porous polyolefin membrane and production process thereof
Assignee: Mitsubishi Chemical Corp
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Filing: 1987-03-27
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Granted: 1988-01-05
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Expires: 2007-03-27
Abstract
Abstract The present invention discloses a hydrophilized porous polyolefin membrane with a polymer of a monomer, which has an HLB value of 2-20, held on at least a part of the pore walls of a porous polyolefin membrane as well as its production process. This hydrophilized porous polyolefin membrane has long-lasting hydrophilicity and good mechanical strength.
Inventors
- 👤 Hajime Itoh
- 👤 Kazutami Mitani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:48
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0081; B01D67/0088; B01D67/0093; B01D67/00931; C; C08; C08J; C08J9/00; C08J9/36; C08J9/40; C08J9/405
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
42 words
A hydrophilized porous polyolefin membrane, wherein a polymer of a monomer containing at least one unsaturated polymerizable bond and having an HLB value of 2-20 is held on at least a part of the pore walls of a starting porous polyolefin membrane.
Claim 2
Dependent Claim
42 words
A hydrophilized porous polyolefin membrane, wherein a polymer of a monomer containing at least one unsaturated polymerizable bond and having an HLB value of 2-20 is held on at least a part of the pore walls of a starting porous polyolefin membrane.
Claim 3
Dependent Claim
19 words
The hydrophilized porous polyolefin membrane as claimed in claim 1, wherein the HLB value of the monomer is 5-15.
Claim 4
Dependent Claim
22 words
The hydrophilized porous polyolefin membrane as claimed in claim 1, wherein the starting porous membrane is in the form of hollow fibers.
Claim 5
Dependent Claim
34 words
The hydrophilized porous polyolefin membrane as claimed in claim 1, wherein the polyolefin is a polymer composed principally of at least one monomer selected from the group consisting of ethylene, propylene, 4-methyl-1-pentene and 3-methyl-1-butene.
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) | 1991-01-04 | 1991-07-06 | 1992-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-04 | 1995-07-06 | 1996-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-04 | 1999-07-06 | 2000-01-05 | $7700.00 | Window Closed / Lapsed |