Pigment compsn. contg. agglomerates of silicates - prepd. by binding finely divided silicate with phosphate of silicate

摘要

Opt. white pigments are 20 mu-1 cm. agglomerates contg. 90-99 pts.wt. anhydrous silicate particles of size 2-100 mu, pref. 4-40 mu, bound with 1-10 pts.wt. inorganic binder, Agglomerates have specific wt. 60-95% of anhydrous silicate component and absorb is not 10wt.% water. Pref. anhydrous silicates are SiO2, Be, Mg, and/or Ca silicates, and/or Li, Be, Mg, Ba Na, K and/pr Ca aluminosilicates, and/or their mixts., and esp. feldspar opt. mixed with SiO2. Inorganic binders are pref. glassy phosphates contg.4-100 P atoms per molecule, montmorillonite with expanded lattice, and/or soluble Na, K, and/or Li silicates and/or mixts. Pigments are prepd. by mixing silicate, binder and water, forming into shape of size 20 mu-1 cm. followed by calcining. Pigments are used for colouring organic polymers, oils, and waxes and make films and sheets opaque.