EP0249513A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Hydrophilic porous membrane, method for production thereof, and plasma separator using said membrane
Assignee: Terumo Corp
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Filing: 1987-05-07
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Granted: —
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Expires: 2007-05-07
Abstract
Abstract A hydrophilic porous membrane having graft chains of a hydrophilic monomer formed on the surface of a hydrophobic porous membrane so as to impart to the surface perfect hydrophilicity such that the produced membrane, when wetted, exhibits as swelling ratio of not more than 1% and a bubble point in the range of 0.5 to 8 kg/cm 2 . The hydrophilic porous membrane is produced by irradiating the hydrophobic porous membrane with plasma, feeding the hydrophilic monomer in a gaseous state, and allowing the hydrophilic monomer to be graft polymerized on the surface of the porous membrane. A plasma separator is obtained by using the aforementioned hydrophilic porous membrane as a plasma separation membrane.
Inventors
- 👤 Toshio Masuoka
- 👤 Okihiko Hirasa
- 👤 Yoshio Suda
- 👤 Makoto Onishi
- 👤 Yukio Seita
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 13:33
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0081; B01D67/0093; B01D67/00931; B01D67/009; B01D69/00; B01D69/02; B01D71/00; B01D71/06; B01D71/26; B01D71/262; B01D71/30; B01D71/32; B01D71/34; C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; B01D2323/00; B01D2323/02; B01D2323/38; B01D2325/00; B01D2325/04; B01D2325/38; Y; Y10; Y10S; Y10S521/00; Y10S521/905; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249978; Y10T428/249979
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
67 words
A hydrophilic porous membrane which is characterized by a process of manufacture which comprises forming graft chains of a hydrophilic monomer on the surface of a hydrophobic porous membrane thereby imparting to said surface perfect hydrophilicity such that the produced membrane, when wetted, exhibits a swelling ratio of not more than 1% and a bubble point in the range of 0.5 to 8 kg/ cm 2 .
Claim 2
Dependent Claim
67 words
A hydrophilic porous membrane which is characterized by a process of manufacture which comprises forming graft chains of a hydrophilic monomer on the surface of a hydrophobic porous membrane thereby imparting to said surface perfect hydrophilicity such that the produced membrane, when wetted, exhibits a swelling ratio of not more than 1% and a bubble point in the range of 0.5 to 8 kg/ cm 2 .
Claim 3
Dependent Claim
59 words
.A hydrophilic porous membrane according to Claim 1, wherein said graft chains of a hydrophilic monomer are formed on the surface of said hydrophobic porous membrane by irradiating the outer surface of said porous membrane in an unstrained state with plasma and allowing said hydrophilic monomer supplied in a gaseous state to be graft polymerized onto said outer surface.
Claim 4
Dependent Claim
21 words
A hydrophilic porous membrane according to Claim 1 or 2, wherein the grafting ratio is in the range of.2 to 30%.
Claim 5
Dependent Claim
29 words
A hydrophilic porous membrane according to any one of Claims 1 to 3, wherein said hydrophobic porous membrane is made of a polyolefin or a.partially chlorinated or fluorinated polyolefin.
Claim 6
Dependent Claim
17 words
A hydrophilic porous membrane according to Claim 4, wherein said hydrophobic porous membrane is made of polypropylene.
Claim 7
Dependent Claim
23 words
A hydrophilic porous membrane according to any one of Claims 1 to 4, wherein said hydrophobic porous membrane is made of polyvinylidene fluoride.
Claim 8
Dependent Claim
28 words
A hydrophilic porous membrane according to any one of Claims 1 to 6, wherein the thickness of said membrane is in the range of 20 to 250 lim.
Claim 9
Dependent Claim
28 words
A hydrophilic porous membrane according to any one of Claims 1 to 7, wherein said hydrophobic porouss membrane possesses no skin layer on the outer surface portion thereof.
Claim 10
Dependent Claim
20 words
A hydrophilic porous membrane according to any one of Claims 1 to 8, wherein said hydrophilic monomer is N,N-dimethyl acrylamide.
Claim 11
Dependent Claim
42 words
A hydrophilic porous membrane according to any one of Claims 1 to 9, wherein said membrane, when wetted, shows a swelling ratio in the range of 0 to 0.5% and a bubble point in the range of 0.8 to 2.0 kg/cm .
Claim 12
Independent Claim
64 words
A method for the production of a hydrophilic porous membrane according to any one of Claims 1 to 10, including the steps of irradiating the outer surface of a hydrophobic porous membrane in an unstrained state with plasma and subsequently supplying a hydrophilic monomer in a gaseous state thereby enabling said hydrophilic monomer to be graft polymerized on the surface of said porous membrane.
Claim 13
Dependent Claim
24 words
A method according to Claim 11, wherein said hydrophobic porous membrane possesses an average pore diameter in the range of 0.05 to 1.0 um.
Claim 14
Dependent Claim
24 words
A plasma separator, characterized by possessing as a plasma separation membrane, a hydrophilic porous membrane according to any one of Claims 1 to 10.
Claim 15
Dependent Claim
28 words
' A plasma separator according to Claim 13, wherein said plasma separation membrane possesses a permeability of not less than 90% to total protein component of blood plasma.
Claim 16
Dependent Claim
88 words
A plasma separator according to Claim 13 or 14, wherein said blood plasma separation membrane is a hydrophilic porous membrane produced by a process which comprises irradiating the outer surface of a hydrophobic porous membrane in an unstrained state with plasma and subsequently causing a hydrophilic monomer supplied in a gaseous form to be graft polymerized onto the surface of said hydrophobic porouss membrane and allowing the graft chains formed consequently on the surface of said hydrophobic porous membrane to impart perfect hydrophilicity to said hydrophobic porous membrane.
Claim 17
Dependent Claim
22 words
A plasma separator according to any one of Claims 13 to 15, wherein said hydrophilic monomer is 2-hydroxyethyl methacrylate or N,N-dimethyl acrylamide.
References Cited (Backward Citations)
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