Cuno, Inc.

Amf Gmbh

Other

Kenneth C Hou

Eugene A Ostreicher

Joseph V Fiore

George T Emond

Rodney A Knight

Tung-Ping D Liao

Richard D Sale

Chung-Jen Hou

Haunn-Lin Tony Chen

Wei-Chih Chen

Nils L Dailey

Michael A Michaud

Alvin L Crowder, Iii

James C Disbrow

Ronald V Repetti

Timothy J Webster

C Thomas Badenhop

Paul J Marinaccio

Michael F Kilty

Garrett Cogswell

Robert Rohan

A filter sheet is provided which comprises a self-supporting fibrous matrix having immobilized therein particulate filter aid and particulate ion exchange resin, wherein said particulate filter aid and particulate ion exchange resin are distributed substantially uniformly throughout a cross-section of said matrix. A process for removing ionic impurities from a photoresist solution is also provided which comprises passing the photoresist solution through said filter sheet to remove ionic impurities therefrom.

Filter sheet and process for purifying photoresist composition employing the filter sheet

Process for purifying photoresist composition employing a filter sheet

Filter sheet for purifying photoresist composition

A method for the production of a hydrolytically stable nylon membrane includes providing a nylon having at least about 0.9 moles of amino end groups per mole of nylon and preparing the nylon membrane therefrom. The membrane can be used in cartridges for use in filtration applications as may be necessary in the food and beverage industry as well as for the production of pharmaceuticals and the manufacture of electronic components. The membrane is capable of withstanding autoclaving and hot water sanitization without molecular dissociation regardless of its pore size, or thickness of the membrane, or the nylon solids content of the dope or, the temperature at which the dope is made.

Hydrolytically stable nylon membrane

The invention is directed to a modified polysaccharide material which comprises: (1) polysaccharide covalently bonded to a synthetic polymer; (2) the synthetic polymer being made from (a) a polymerizable compound which is capable of being covalently coupled directly or indirectly to said polysaccharide, and (b) one or more polymerizable compounds containing (i) a chemical group capable of causing the covalent coupling of the compound (b) to an affinity ligand or a biologically active molecule or (ii) a hydrophobic compound. The invention is also directed to devices for the chromatographic separation of at least two components of a mixture comprising the modified polysaccharide material of the invention, wherein the device is configured for radial or tangential flow.

Affinity matrices of modified polysaccharide supports

An ion-exchange media comprising a modified polysaccharide material and a modified particulate polymeric material, said modified materials comprising a polysaccharide and particulate polymeric materials covalently bonded to a synthetic polymer, said synthetic polymer comprising a copolymer made from a polymerization of:

Heavy metal removal process

A microporous membrane modified by coating or grafting thereon a polyionene material. The thus-modified microporous membrane is useful for separating microorganism-originated contaminants from biological liquids.

Polyionene-transformed microporous membrane

A modified microporous membrane comprising an organic polymeric microporous membrane having microporous surfaces and having hydroxyl, mercapto, carboxyl, or amino functionality on the surfaces modified by a reactive modifying polymer having a polymer chain and having along the polymer chain epoxy or epithio functional groups capable of reacting with the functionality on the surface of the membrane and terminal neutral chemical functionality. The preferred reactive modifying polymer is made from a free radical polymerization of:

Low protein binding membrane

An ion-exchange media comprising a modified polysaccharide material and a modified silica material, said modified materials comprising a polysaccharide and silica materials covalently bonded to a synthetic polymer, said synthetic polymer comprising a copolymer made from a polymerization of:

A filter media sheet comprising fine particulate and a self-bonding matrix of cellulose fiber, the surfaces of at least one of which are modified with a polyamido-polyamine epichlorhydrin cationic resin, the matrix incorporating beaten cellulose fiber to provide a Canadian Standard Freeness of less than 600 ml.

Filter sheet

Polyionene-transformed modified polymer-polysaccharide separation matrix and use thereof in removing contaminants of microorganism origin from biological liquids are disclosed.

Polyionene transformed modified polysaccharide supports

A modified silica material which comprises silica covalently bonded to a synthetic polymer, the synthetic polymer being made from (a) a polymerizable compound capable of being covalently coupled directly to said silica, and (b) one or more polymerizable compounds containing (i) an ionizable chemical group, (ii) a chemical group capable of transformation to an ionizable chemical group, (iii) a chemical group capable of causing the covalent coupling of the compound (b) to an affinity ligand or a biologically active molecule or (iv) a hydrophobic compound.

Modified siliceous chromatographic supports

A process is provided for for cationically charge modifying a microporous filter membrane, wherein the membrane is a substantially symmetrical isotropic, hydrophilic, organic polymeric microporous filter membrane, preferably nylon, having a microstructure throughout the membrane. The process comprises bonding a primary charge modifying amount of a water soluble cationic charge modifying agent to substantially all of the membrane microstructure, without substantial pore size reduction or pore blockage. The charge modifying agent is a reaction product of a polyamine with epichlorohydrin, the reactive product having (i) tertiary amine or quaternary ammonium groups, and (ii) epoxide groups along a polyamine chain, the epoxide groups capable of bonding to the microstructure of the membrane.

Process for charge modifying a microphorous membrane

A cationic charge modified microporous membrane comprising a hydrophilic organic polymeric microporous membrane and a cationic charge modifying agent bonded to substantially all of the wetted surfaces of the membrane, the charge modifying agent being an epichlorohydrin modified polyamide having tertiary amine or quaternary ammonium groups. A secondary charge modifying agent may be employed selected from: (i) aliphatic polyamines having at least one primary amine or at least two secondary amines; and (ii) aliphatic amines having at least one secondary amine and a carboxyl or hydroxyl substituent. Processes for producing and using the membrane are also described.

Liquid filtration using hydrophilic cationic isotropic microporous nylon

A modified polypeptide material comprising an insoluble polypeptide carrier and synthetic polymer, the synthetic polymer made from (a) a polymerizable compound which has a chemical group capable of covalent coupling to the insoluble polypeptide carrier and (b) one or more polymerizable compounds containing an ionizable chemical group, a chemical group capable of transformation to an ionizable chemical group, a group capable of causing the covalent coupling of the synthetic polymer to an affinity ligand or a biologically active molecule, or a hydrophobic chemical group. The synthetic polymer is covalently bonded to the insoluble polypeptide carrier.

Growing community of inventors

San Antonio, TX, United States of America

Kenneth C Hou