Patent US3884616A successfully refreshed from Google Patents.
Patent EP0308206A2 successfully refreshed from Google Patents.
EP0308206A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Polyaldehyde activated membranes, their production and use
Assignee: Gelman Sciences Inc
•
Filing: 1988-09-14
•
Granted: —
•
Expires: 2008-09-14
Abstract
Abstract An activated microporous membrane is provided, having aldehyde functional groups on its inner and outer surfaces. The aldehyde functionality on all surfaces provides for effective covalent bonding to the membrane by amine containing materials. The activated membrane can be made of a polysulfone/polyacrolein mixture or a polysulfone microporous membrane treated with a polyacrolein solution.
Inventors
- 👤 Kariyawasam P.W. Pemawan
- 👤 Mark D. Heisler
- 👤 Menahem A. Kraus
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 05:45
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0081; B01D67/0088; B01D67/0002; B01D67/0009; B01D67/0011; B01J; B01J20/00; B01J20/22; B01J20/26; B01J20/261; B01J20/262; B01J20/264; B01J20/28; B01J20/28014; B01J20/28033; B01J20/28054; B01J20/28078; B01J20/2808; B01J20/30; B01J20/32; B01J20/3202; B01J20/3206; B01J20/3208; B01J20/321; B01J20/3212; B01J20/3231; B01J20/3242; B01J20/3268; B01J20/327; B01J20/3272; B01J20/3274; B01J20/3276; G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/53; G01N33/543; G01N33/544; G01N33/545; B01D2325/00; B01D2325/12; B01J2220/00; B01J2220/40; B01J2220/44; B01J2220/445
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
63 words
A membrane comprising: (a) a microporous polymeric membrane material having an internal and external surface area; and (b) polyaldehyde physically combined with said microporous polymeric membrane such that the aldehyde groups are substantially free to react with aldehyde reactive materials; and polyaldehyde being in an amount sufficient to cover substantially all of said internal and external surface area of said microporous polymeric membrane.
Claim 2
Dependent Claim
63 words
A membrane comprising: (a) a microporous polymeric membrane material having an internal and external surface area; and (b) polyaldehyde physically combined with said microporous polymeric membrane such that the aldehyde groups are substantially free to react with aldehyde reactive materials; and polyaldehyde being in an amount sufficient to cover substantially all of said internal and external surface area of said microporous polymeric membrane.
Claim 3
Dependent Claim
62 words
An activated polymeric microporous membrane having both external and internal surfaces; in which substantially all the available surfaces of the microporous membrane are coated by a polyaldehyde-containing mixture in an amount sufficient to effectively activate the microporous membrane; and in which the mixture is soluble enough to penetrate substantially all interstices of the microporous membrane without substantial damage to the pore structure.
Claim 4
Dependent Claim
62 words
An activated polymeric microporous membrane having both external and internal surfaces; in which substantially all the available surfaces of the microporous membrane are coated by a polyaldehyde-containing mixture in an amount sufficient to effectively activate the microporous membrane; and in which the mixture is soluble enough to penetrate substantially all interstices of the microporous membrane without substantial damage to the pore structure.
Claim 5
Dependent Claim
54 words
A membrane as claimed in claim 1 or claim 2 wherein either (a) the polyaldehyde is physically combined with the membrane polymer before the activated microporous membrane is cast; or (b) the membrane polymer is cast into a microporous membrane, then physically combined with the polyaldehyde by coating the cast membrane with the polyaldehyde.
Claim 6
Dependent Claim
35 words
A membrane as claimed in claim 3(b) wherein the polyaldehyde is dissolved in a solvent capable of dissolving the polyaldehyde the solvent being pyridine or dimethyl formamide in an amount sufficient to dissolve the polyaldehyde.
Claim 7
Dependent Claim
40 words
A membrane as claimed in any one of claims 1 to 4 wherein: the polyaldehyde is dissolved in a solvent; and wherein the membrane polymer is insoluble enough in the solvent to avoid substantial damage of the membrane pore structure.
Claim 8
Dependent Claim
30 words
A membrane as claimed in any one of claims 1 to 5 wherein the membrane is a supported membrane optionally, the polyaldehyde being aldehyde-agarose, polyacrolein homopolymer or an acrolein copolymer.
Claim 9
Dependent Claim
29 words
A membrane as claimed in any one of claims 1 to 5 wherein the membrane polymer comprises polysulfone and the polyaldehyde is a copolymer of acrolein and hydroxyethyl methacrylate.
Claim 10
Dependent Claim
32 words
A membrane as claimed in any one of claims 1 to 7 having a total binding capacity of at least about 10 ug/cm² based on the outer surface area of the membrane.
Claim 11
Dependent Claim
49 words
A process for making an activated microporous membrane comprising: casting a microporous membrane that comprises a membrane polymer; and activating the membrane polymer by physically combining a polyaldehyde containing mixture with the membrane polymer in an amount sufficient to cover substantially all available surface area of the microporous membrane.
Claim 12
Dependent Claim
49 words
A process for making an activated microporous membrane comprising: casting a microporous membrane that comprises a membrane polymer; and activating the membrane polymer by physically combining a polyaldehyde containing mixture with the membrane polymer in an amount sufficient to cover substantially all available surface area of the microporous membrane.
Claim 13
Dependent Claim
83 words
A process as claimed in claim 9 wherein (a) the activating step follows the casting step; and the activating step comprises physically treating the membrane with a polyaldehyde containing mixture; or (b) the activating step precedes the casting step; and the activating step comprises physically mixing the polyaldehyde containing mixture with the membrane polymer in an amount sufficient to activate the membrane; and the casting step comprises casting a microporous membrane from the mixture of the membrane polymer and the polyaldehyde containing mixture.
Claim 14
Dependent Claim
50 words
A process as claimed in claim 9 or claim 10 wherein the membrane is a supported membrane, and comprises a membrane polymer which is one of the following, polysulfone, polyacrylonitrile-vinyl chloride, nylon or propylene; and/or wherein the polyaldehyde containing mixture includes polyacrolein or a copolymer of acrolein and hydroxyethyl methacrylate.
Claim 15
Dependent Claim
18 words
An activated microporous membrane made by a process as claimed in any one of claims 9 to 11.
Claim 16
Dependent Claim
19 words
The use of a membrane as defined in any one of claims 1 to 8 as an affinity membrane.
Claim 17
Dependent Claim
12 words
The use of polyaldehyde in the manufacture of an activated microporous membrane.
Claim 18
Dependent Claim
12 words
The use of polyaldehyde in the manufacture of an activated microporous membrane.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.