The paper manufacture service water sum silica filler and its production manner and this filler the internal is done the paper

摘要

PURPOSE: To obtain a hydrated silicic acid filler which can give excellent opacity not accompanied with increased friction coefficient of paper, to provide the production process therefor and to produce the paper containing the filler. ;CONSTITUTION: This silicic acid filler for paper-making is composed of fine particles of amorphous silicic acid hydrate as a product in neutralization of aqueous sodium silicate solution containing fine particles of amorphous metal compounds. The filler can be produced by the process characterized by substituting an aqueous solution of an acidic metal sulfate, a precursor of the hardly soluble metal oxide hydrate for a part of the sulfuric acid added by dividing in portions in the wet process for the filler from sodium silicate to carry out the reaction.;COPYRIGHT: (C)1994,JPO&Japio