Patent ID: 7754877

Claim:
A process for the preparation of reactive cyclodextrins, in which process the cyclodextrins CD are reacted with a bifunctional compound X-spacer-Y, wherein X is a group which reacts with CD, the spacer is an aliphatic, cycloaliphatic or aromatic hydrocarbon radical containing from 1 to 25 carbon atoms, Y is a functional group which is reacted with a Z-Reactive or is a Reactive which Reactive is capable of reaction with cellulosic or proteinic materials, X is halogen, Z is acid halide or diazonium, and the Reactive or the Reactive of Z-Reactive is 2,3-dibromopropionyl, 2-bromoacryloxyl, 2-chloroacryloyl, methacryloyl, acryloxyl group, a vinyl sulfone group, a halotriazinyl or haloquinoxazolinoyl group, or a phenyl sulfonyl ethyl hydrogen sulphate radical or a phenyl sulfonyl ethyl sulfonic acid radical, when Y is a functional group which is reacted with the Reactive, the functional group is an amine or a phenyl, and the cyclodextrins CD is defined as an α, β or γ cyclodextrin derivative selected from substituted or unsubstituted cyclodextrins or mixtures thereof and the term substituted cyclodextrin derivative means that the cyclodextrin may be substituted one or more times by C 1-14 alkyl, C 2-14 alkenyl, OH, carbonyl, carboxyl or amine groups.