Methods and apparatus for the formation of heterogeneous ion-exchange membranes

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 6503957
SERIAL NO

09444055

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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The present invention provides methods and apparatus for the formation of heterogeneous ion-exchange membranes by prescribed in-line compounding and extrusion of a polymeric binder and heat sensitive ion-exchange resin. The ion-exchange resin is incorporated, at a late process stage, into the melted matrix polymer at relatively low temperature and residence time prior to transfer to a die head for extrusion. In the presently preferred embodiment, the in-line compounding apparatus comprises a twin-screw compounding extruder, for effecting late stage kneading and mixing of ion-exchange resin and optional additives to the polymer melt, prior to compression to transfer the blended polymer melt to a die head for extrusion. Accordingly, the final properties of the resultant heterogeneous ion-exchange membrane are enhanced as the blended polymer melt material is not exposed to excessive heat and shear history. Resultant heterogeneous ion-exchange membranes and apparatus for treatment of fluid streams utilizing such membranes are also provided.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
SNOWPURE, LLCLAGUNA HILLS, CA0

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bernatowicz, Joseph M Langhorne, PA 2 43
O'Hare, Ronald J South Laguna, CA 3 86
Snow, Michael J Rancho Santa Fe, CA 3 57

Cited Art Landscape

Patent Info (Count) # Cites Year
 
PIONETICS CORPORATION (1)
* 5788826 Electrochemically assisted ion exchange 89 1997
 
E. I. DU PONT DE NEMOURS AND COMPANY (2)
* 4909971 Process for making a heterogeneous membrane film 10 1988
* 6187696 Breathable composite sheet structure 52 1997
 
KIMBERLY-CLARK WORLDWIDE, INC. (1)
* 5955187 Microporous film with liquid triggered barrier feature 33 1997
 
EXXON CHEMICAL PATENTS INC. (1)
* 5629253 Polymerization catalyst systems, their production and use 9 1996
* Cited By Examiner

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Patent Info (Count) # Cites Year
 
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ASI SPECIALITIES, LTD. (1)
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8246723 English Title Not Available 4 2011
8221527 English Title Not Available 8 2011
9205372 English Title Not Available 2 2012
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GLOBAL RESEARCH TECHNOLOGIES, LLC (1)
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