摘要:
Water-repellent gypsum compositions of components (A) 100 parts by weight of gypsum (B) 0.05-50 parts by weight of oxide and/or hydroxide or alkali and/or alkaline earth metals (C) 0.05-20 parts by weight of glycol-functional siloxane mixture, preparable by the reaction of 1 mole of alkyltrihalosilane or alkyltrialkoxysilane with at least 2.5 moles of a glycol or mixture of glycols, exhibit water repellancy similar to gypsum which has been hydrophobed with H-siloxane.
摘要:
The invention relates to nematic organosiloxanes (F) having at least two mesogenic side groups, of which at most one has three nuclei and all the others have two nuclei, where the term nucleus is taken to mean a six-membered ring or a bicyclic structure consisting of six-membered rings, and where at least one of the mesogenic side groups contains a methacryloyl or acryloyl group.