Degussa Akteingesellschaft

F Werner Weigelt

Gerhard Morlock

A radiation-hardenable agent for the scratch-resistant coating of organic glasses consists of a cocondensate of vinyl trimethoxysilane or vinyl triethoxysilane and tetramethoxysilane or tetraethoxysilane, a reactive diluent which comprises at least 2 vinyl, acrylic or methacrylic groups per molecule and, if necessary, of a known photoinitiator. The agent can be prepared by forming the cocondensate in the presence of an amount of water which is at least equivalent to the methoxy or ethoxy groups present or in the presence of a small amount of a carboxylic acid, removing all volatile portions of the reaction mixture and mixing the oily siloxane remaining as residue with the other components.

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Lampertheim, Germany

F Werner Weigelt