| 摘要 |
Process for preparing a dispersion comprising silicon dioxide particles and cationizing agents, by dispersing 50 to 75 parts by weight of water, 25 to 50 parts by weight of silicon dioxide particles having a BET surface area of 30 to 500 m2/g and 100 to 300μg of cationizing agent per square metre of the BET surface area of the silicon dioxide particles, wherein the cationizing agent is obtainable by reacting at least one haloalkyl-functional alkoxysilane, its hydrolysis products or condensation products and/or a mixture thereof with at least one aminoalcohol and a defined amount of water and optionally removing the resulting hydrolysis alcohol at least partly from the reaction mixture. Process for preparing a dispersion comprising silicon dioxide particles and cationizing agents, by dispersing 50 to 75 parts by weight of water, 25 to 50 parts by weight of silicon dioxide particles having a BET surface area of 30 to 500 m2/g and 100 to 300μg of a cationizing agent per square metre of the BET surface area of the silicon dioxide particles, wherein the cationizing agent comprises one or more quaternary, aminoalcohol-functional, organosilicon compounds of the general formula III and/or condensation products thereof, wherein Ru and Rv are each independently of each other an alkyl group having 2 to 4 carbon atoms, m is 2 to 5 and n is 2 to 5. |
