| 摘要 |
In order to separate dyes from aqueous solutions, an improved adsorption agent is proposed, which can be produced according to a method, wherein in a first reaction step, a multifunctional alcohol is reacted with an alkylene oxide into a star-shaped OH-terminated polyether. In a second reaction step, the polyether is reacted with a silane compound such that at an average more than one alkoxy silane group per molecule polyether is present, and in a third reaction step a cross-linking product is obtained by condensation in the presence of acids, wherein optionally further siloxane group-containing modifying agents can be incorporated, and wherein in a final treatment step, the cross-linked products obtained in said manner are separated and optionally dried or ground,
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