Patent US3290927A successfully refreshed from Google Patents.
Patent EP0222365A2 successfully refreshed from Google Patents.
EP0222365A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Hydrophilized porous polyolefin membrane and production process thereof
Assignee: Mitsubishi Chemical Corp
•
Filing: 1986-11-11
•
Granted: —
•
Expires: 2006-11-11
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
EP
Data Source
google_patents
Last Synchronized
2026-10-27 20:56
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: 11
Claim 1
Independent Claim
36 words
A hydrophilized porous polyolefin membrane, wherein a polymer of a monomer 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
36 words
A hydrophilized porous polyolefin membrane, wherein a polymer of a monomer 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
21 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-l-pentene and 3-methyl-l-butene.
Claim 6
Dependent Claim
62 words
A process for the production of a hydrophilized porous polyolefin membrane, which comprises the steps of holding a monomer which has an HLB value of 2 - 20 and contains at least one unsaturated polymerizable bond and a polymerization catalyst on at least a part of the pore walls of a starting porous polyolefin membrane and heating them to polymerize the monomer.
Claim 7
Dependent Claim
62 words
A process for the production of a hydrophilized porous polyolefin membrane, which comprises the steps of holding a monomer which has an HLB value of 2 - 20 and contains at least one unsaturated polymerizable bond and a polymerization catalyst on at least a part of the pore walls of a starting porous polyolefin membrane and heating them to polymerize the monomer.
Claim 8
Dependent Claim
59 words
The process as claimed in Claim 5, wherein the monomer and the polymerization catalyst are held on the pore walls of the starting porous membrane by preparing a solution of the monomer and the polymerization catalyst dissolved in a solvent of water and/or an organic solvent, impregnating the starting porous membrane with the solution and then evaporating the solvent.
Claim 9
Dependent Claim
18 words
The process as claimed in Claim 5, wherein the HLB value of the monomer is 5 - 15.
Claim 10
Dependent Claim
19 words
The process as claimed in Claim 5, wherein the starting porous membrane is in the form of hollow fibers.
Claim 11
Dependent Claim
31 words
The process as claimed in Claim 5, wherein the polyolefin is a polymer composed principally of at least one monomer selected from the group consisting of ethylene, propylene, 4-methyl-l-pentene and 3-methyl-l-butene.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.