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    Chemical modification of shaped hydrogels in non-aqueous medium

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    5530111.pdf (412.0Kb)
    Downloads: 28
    Publication Date
    1996-06-25
    Filing Date
    1994-08-29
    Inventor
    Glasser, Wolfgang G.
    Frazier, Charles E.
    Samaranayake, Gamini S.
    Metadata
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    Abstract
    A method is described for the chemical modification of pre-shaped hydrogels in non-aqueous medium. The conditions permit the reaction of highly expanded, porous hydrogel particles, such as spherical beads, using pseudo homogeneous reaction conditions in the absence of water. The method involves a three step procedure in which the porous gels are solvent exchanged int a water-free solvent (step 1) with minimal change in gel dimension and porosity; followed by reaction under non-aqueous condition (step 2); and followed by solvent exchange into water (step 3). Many different types of reactions requiring non-aqueous conditions may be carried out using these conditions. The method has particularly been demonstrated for crosslinking fluorinating beads, and for esterifying beads in a reaction involving multifunctional free carboxylic acids in the presence of dicyclohexylcarbodiimide (DCC).
    Assignee
    Center for Innovative Technology
    Virginia Polytechnic Institute and State University
    Virginia Tech Intellectual Properties, Inc.
    Patent Number
    5530111
    Application Number
    8296171
    Source URL
    http://pimg-fpiw.uspto.gov/fdd/11/301/055/0.pdf
    Primary/U.S. Class
    536/56
    Other/U.S. Class
    536/58
    536/84
    536/124
    CPC Class
    C08B3/00
    C08B3/14
    Patent Type
    utility
    URI
    http://hdl.handle.net/10919/72320
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