EP0190558A2
Expired / Lapsed
EP
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Method for the manufacture of a hydrophilic porous membrane
Assignee: Terumo Corp
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Filing: 1986-01-08
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Granted: —
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Expires: 2006-01-08
Abstract
Abstract A hydrophilic porous membrane comprises a porous membrane made of a hydrophobic polymer and a coating formed on at least one surface of the porous membrane and on the inner surface of pores of the membrane with a water-insoluble hydrophilic polymer soluble in a solvent exhibiting satisfactory stability and a satisfactory wetting property with respect to the hydrophobic polymer and a method for the manufacture of the hydrophilic porous membrane.
Inventors
- 👤 Masaaki Kasai
- 👤 Noriyuki Koyama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 17:47
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0081; B01D67/0088
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
60 words
A hydrophilic porous membrane, comprising a porous membrane made of a hydrophobic polymer and a coating formed on at least one surface of said porous membrane and on the inner surface of pores of said porous membrane with a water-insoluble hydrophilic polymer soluble in a solvent exhibiting satisfactory stability and a satisfactory wetting property with respect to said hydrophobic polymer.
Claim 2
Dependent Claim
60 words
A hydrophilic porous membrane, comprising a porous membrane made of a hydrophobic polymer and a coating formed on at least one surface of said porous membrane and on the inner surface of pores of said porous membrane with a water-insoluble hydrophilic polymer soluble in a solvent exhibiting satisfactory stability and a satisfactory wetting property with respect to said hydrophobic polymer.
Claim 3
Dependent Claim
48 words
A hydrophilic porous membrane according to Claim 1, wherein said water-insoluble hydrophilic polymer is one member selected from the group consisting of a vinyl alcohol-vinyl acetate copolymer, vinyl acetate-vinyl pyrrolidone copolymer, polymethyl methacrylate-polyethylene glycol block copolymer, and a segmented polyurethane having polyethylene glycol as a soft segment thereof.
Claim 4
Dependent Claim
23 words
A hydrophilic porous membrane according to Claim 1, wherein said hydrophobic polymer is a fluorine resin type polymer or a polyolefin type polymer.
Claim 5
Dependent Claim
18 words
A hydrophilic porous membrane according to Claim 1, wherein said hydrophobic polymer is a fluorine resin type polymer.
Claim 6
Dependent Claim
17 words
A hydrophilic porous membrane according to Claim 4, wherein said fluorine resin type polymer is polyvinylidene fluoride.
Claim 7
Dependent Claim
19 words
A hydrophilic porous membrane according to Claim 4, wherein said water-soluble hydrophilic polymer is a vinyl alcohol-vinyl acetate copolymer.
Claim 8
Independent Claim
68 words
A method for the manufacture of a hydrophilic porous membrane, characterized by preparing a porous membrane of a hydrophobic polymer, impregnating said porous membrane with a solution obtained by dissolving a water-insoluble hydrophilic polymer in a solvent exhibiting a satisfactory ability to dissolve said hydrophilic polymer and exhibiting satisfactory stability and a satisfactory wetting property with respect to said hydrophobic polymer, and thereafter drying the impregnated porous membrane.
Claim 9
Independent Claim
68 words
A method for the manufacture of a hydrophilic porous membrane, characterized by preparing a porous membrane of a hydrophobic polymer, impregnating said porous membrane with a solution obtained by dissolving a water-insoluble hydrophilic polymer in a solvent exhibiting a satisfactory ability to dissolve said hydrophilic polymer and exhibiting satisfactory stability and a satisfactory wetting property with respect to said hydrophobic polymer, and thereafter drying the impregnated porous membrane.
Claim 10
Dependent Claim
38 words
A method according to Claim 7, wherein said water-insoluble hydrophilic polymer is a vinyl alcohol-vinyl acetate copolymer, vinyl acetate-vinyl pyrrolidone copolymer, polymethyl methacrylate-polyethylene glycol block copolymer, and a segmented polyurethane having polyethylene glycol as a soft segment thereof.
Claim 11
Dependent Claim
30 words
A method according to Claim 8, wherein said solvent is at least one member selected from the group consisting of methanol, ethanol, isopropanol, and mixtures of said alcohols with water.
Claim 12
Dependent Claim
26 words
A method according to Claim 7, wherein the concentration of said hydrophilic polymer in said solution is in the range of 0.1 to 10.0% by weight.
Claim 13
Dependent Claim
21 words
A method according to Claim 7, wherein said hydrophobic polymer is a fluorine resin type polymer or a polyolefin type polymer.
Claim 14
Dependent Claim
16 words
A method according to Claim 7, wherein said hydrophobic polymer is a fluorine resin type polymer.
Claim 15
Dependent Claim
15 words
A method according to Claim 12, wherein said fluorine resin type polymer is polyvinylidene fluoride.
Claim 16
Dependent Claim
36 words
A method according to Claim 7, wherein said impregnation of said porous membrane of a hydrophobic polymer with the solution of said water-insoluble hydrophilic polymer is effected by immersion of said porous membrane in said solution.
Claim 17
Dependent Claim
36 words
A method according to Claim 14, wherein the duration of said immersion of said porous membrane of a hydrophobic polymer with said solution of water-insoluble hydrophilic polymer is in the range of 1 to 30 seconds.
Claim 18
Dependent Claim
17 words
A method according to Claim 12, wherein said water-insoluble hydrophilic polymer is a vinyl alcohol-vinyl acetate copolymer.
References Cited (Backward Citations)
No citation records indexed.
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