Patent US4832953A successfully refreshed from Google Patents.
Patent US4663227A successfully refreshed from Google Patents.
US4663227A
Expired / Lapsed
US
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Hydrophilized membrane of porous hydrophobic material and process for preparing the same
Assignee: Mitsubishi Chemical Corp
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Filing: 1985-09-16
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Granted: 1987-05-05
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Expires: 2005-09-16
Abstract
Abstract A hydrophilized membrane of a porous hydrophobic material having micropores each defined by a surface at least part of which is coated with a hydrophilizing agent which is solid at about 20° C. and substantially insoluble in water. The hydrophilizing agent is preferably selected from monofatty acid esters of propylene glycol. Also disclosed are processes for hydrophilizing such porous hydrophobic membranes.
Inventors
- 👤 Hisayoshi Yamamori
- 👤 Michio Inoue
- 👤 Kazuto Kawashima
- 👤 Hisao Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:42
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/02; B01D67/00; B01D67/0081; B01D67/0088; B01D67/0095; C; C08; C08J; C08J9/00; C08J9/36; C08J9/40; Y; Y10; Y10S; Y10S521/00; Y10S521/918; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249978; Y10T428/249979; Y10T428/249987
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
109 words
A hydrophilized, water-permeable, microporous membrane made of a hydrophobic material selected from the group consisting of polyethylene, polypropylene, poly-4-methylpentene-1, polyvinylidenefluoride, polytetrafluoropropylene, copolymers of hexafluoropropylene and tetrafluoropropylene, and copolymers of a fluorinated olefin monomer and an olefin monomer; said membrane having a porosity of 20-90 volume percent, and said membrane having not less than 10% of the surface area of the pores thereof coated with from 1-100% by weight of a hydrophilizing agent based on the weight of the hydrophobic membrane, said agent being a monoester of propylene glycol and a saturated fatty acid having 12-22 carbon atoms which is solid at about 20° C. and substantially insoluble in water.
Claim 2
Dependent Claim
109 words
A hydrophilized, water-permeable, microporous membrane made of a hydrophobic material selected from the group consisting of polyethylene, polypropylene, poly-4-methylpentene-1, polyvinylidenefluoride, polytetrafluoropropylene, copolymers of hexafluoropropylene and tetrafluoropropylene, and copolymers of a fluorinated olefin monomer and an olefin monomer; said membrane having a porosity of 20-90 volume percent, and said membrane having not less than 10% of the surface area of the pores thereof coated with from 1-100% by weight of a hydrophilizing agent based on the weight of the hydrophobic membrane, said agent being a monoester of propylene glycol and a saturated fatty acid having 12-22 carbon atoms which is solid at about 20° C. and substantially insoluble in water.
Claim 3
Dependent Claim
28 words
The membrane according to claim 1, wherein said fatty acid is selected from the group consisting of lauric acid, myristic acid, palmitic acid, stearic acid and behenic acid.
Claim 4
Dependent Claim
17 words
The membrane according to claim 2, wherein said propylene glycol monofatty acid ester is propylene glycol monostearate.
Claim 5
Dependent Claim
28 words
The membrane according to claim 1, wherein said propylene glycol monofatty acid ester is a monoester of propylene glycol and a saturated fatty acid having 14-22 carbon atoms.
Claim 6
Dependent Claim
26 words
The membrane according to claim 1, wherein not less than 30% of the surface area of the pores is covered or coated with said hydrophilizing agent.
Claim 7
Dependent Claim
26 words
The membrane according to claim 5, wherein not less than 50% of the surface area of the pores is covered or coated with said hydrophilizing agent.
Claim 8
Dependent Claim
24 words
The membrane according to claim 1, wherein the surface area of the pores is covered or coated in the entirety with said hydrophilizing agent.
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) | 1990-05-04 | 1990-11-03 | 1991-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-04 | 1994-11-03 | 1995-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-04 | 1998-11-03 | 1999-05-05 | $7700.00 | Window Closed / Lapsed |