Cyclodextrin polymers and process for their preparation
AssigneeConsortium fur Elektrochemische Industries GmbH
InventorsPeter Nussstein, Guenther Staudinger, Wolfram Steinert, Franz-Heinrich Kreuzer, Wolfgang Schmitt-Sody
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Abstract
Hydrophilic, water-dilatable cyclodextrin polymerizates have a high cyclodextrin content and possess good mechanical properties. The cyclodextrin pearl polymerizates are produced by reacting hydroxyalkyl cyclodextrin derivatives with bifunctional crosslinking agents such as epichlorohydrin or diepoxides, followed by hydroxyalkylation of the primary product so obtained. The cyclodextrin polymerizates produced in this manner have mechanical properties appreciably superior to those of known, comparable cyclodextrin polymers.
Claims6
A crosslinked, water-insoluble hydroxyalkylcyclodextrin polymer substituted by free C.sub.2 - to C.sub.4 -hydroxyalkyl units.
A process for the preparation of a crosslinked, water-insoluble hydroxyalkylcyclodextrin polymer substituted by free C.sub.2 -C.sub.4 -hydroxyalkyl units, which comprises
- crosslinking hydroxyalkylcyclodextrin using a polyvalent crosslinking agent in a two-phase reaction medium comprising an alkaline aqueous phase and a hydrocarbon phase, in the presence of 0.5 to 5.0% by weight of ethyoxylated phosphoric acid ester, based on the hydrocarbon phase;
- and
- reacting the polymer in said alkaline aqueous reaction medium with 10% to 50% by weight of alkylene oxide, based on the weight of the polymer, at 50.degree. C. to 100.degree. C.
Dependencies are inferred from the claim text.