Abstract: A method of improving opacity and brightness of paper containing synthetic sodium magnesium alumino silicate, sodium alumino silicate and silicic acid or silica pigments which utilizes reducing the structure of such pigments by hard media grinding.

Abstract: A method for producing alkali metal polysilicates is disclosed. Polysilicates, produced by hydrothermally reacting an aqueous dispersion of finely-divided silica and an alkali metal hydroxide are spray dried and the solid product is fractured and pulverized. The fractured mass is then pelletized employing the solubility of the polysilicates to form a free-flowing product having a continuous, even surface. Pelletization may be effected with or without the use of water and/or binders.

Abstract: A method for producing alkali metal polysilicate complexes and their use as builders in detergents is disclosed. The polysilicates are produced by hydrothermally reacting, under certain controlled conditions, an aqueous dispersion of finely-divided silica, an alkali metal hydroxide and a sulfate salt of an alkali metal. The synthesized reaction mixture is then spray dried and the solid product fractured, pulverized and agitated in a rotating drum to form a product having particularly advantageous properties. The products of the invention can be used in adhesives, in the production of silica gel, in textiles and the like. However, their use as builders in detergents and in combination with known anionic, nonionic and amphoteric surface active compounds (surfactants) is disclosed and claimed.

Abstract: An improved method for producing alkalimetal polysilicates is disclosed. The polysilicates are produced by hydrothermally reacting an aqueous dispersion of finely-divided silica and an alkali metal hydroxide. The synthesized reaction mixture is then spray dried with the solid product then being fractured and pulverized. The fractured particles are thereafter pelletized and dried in a fluidized bed to produce a product having predetermined characteristics or properties. The product can be used in adhesives, in the production of silica gel, in textiles and the like. However, their use as builders in detergents and in combination with known anionic, nonionic and amphoteric surface active compounds (surfactants) is disclosed as being particularly advantageous.