Coat are done the inorganic powder body and its production manner, and the coating agent and its production manner null for the inorganic powder body

摘要

PURPOSE: To provide a process for preparing a coating agent for an inorganic powder which modifies the surface of an inorganic powder by hydrolyzing a liq. contg. an alkoxysilane, a catalyst, and a particular amt. or more of water under particular conditions to solubilize the alkoxysilane and further adding water. ;CONSTITUTION: A process for preparing a coating agent for an inorg. powder, comprising the steps of: hydrolyzing a liq. contg. an alkoxysilane, a catalyst, and water at least in an amt. large enough to theoretically hydrolyze 100% of the alkoxysilane at pH3 or less to solubilize the alkoxysilane; and further adding water. Pref., after the hydrolysis of the liq. contg. an alkoxysilane, a catalyst, and water at least in an amt. large enough to theoretically hydrolyze 100% of the alkoxysilane at pH3 or less to solubilize the alkoxysilane, water is further added, the soln. is then adjusted to pH3 to 4, and a reactive org. compd. having two or more functional groups capable of condensing with the hydrolyzate of the alkoxysilane (e.g. a silane coupler) is mixed therewith. The alkoxysilane is pref. an oligomer having a monomer content of not more than 1%.;COPYRIGHT: (C)1996,JPO