Synthetic tetra-silicic mica and water sol thereof

Details Synthetic tetra-silicic mica and water sol thereof Synthetic tetra-silicic mica and water sol thereof

1976-03-22

1978-01-10

Lovering, Richard D.

Compositions

Preservative agents

Anti-corrosion

106 15FP, 106 382, 106291, 106DIG3, 252 63, 252 632, 252 635, 252378R, 423331, B01J 1300, C01B 3324

Patent

active

040678199

ABSTRACT:
This invention relates to a process for producing a tetra-silicic mica having the formula Na.sub.0.6 - 0.8 Mg.sub.2.6 - 2.7 (Si.sub.4 O.sub.10)F.sub.2 which comprises mixing components selected from the group of sodium fluoride (NaF, sodium silicofluoride (Na.sub.2 SiF.sub.6), magnesium fluoride (MgF.sub.2), magnesia (MgO) and silica (SiO.sub.2) in a mole ratio of (a) 1 - 1.2 NaF : 0.5 - 1.2 MgF.sub.2 : 2 MgO : 4 SiO.sub.2 or (b) 0.5 - 0.8 Na.sub.2 SiF.sub.6 : 0.5 - 1.2 MgF.sub.2 : 2 MgO : 4 SiO.sub.2, melting the mixture at a temperature of 1300.degree. C to 1500.degree. C and cooling the melt to obtain a crystal.
This invention further relates to a water sol of flake-like ultra-fine particles of tetra-silicic mica produced in accordance with claim 1, wherein most of the flake-like particles dispersed in water have a thickness of less than 50 A and an average diameter of the flat plane of between 500 A and 3000 A.

REFERENCES:
patent: 3839055 (1974-10-01), Grossman
patent: 3936383 (1976-02-01), Daimon et al.
Hatch et al.: "Synthetic Mica Investigations, Part IX, Review of Progress from 1947 to 1955", U.S. Dept. of Interior, Bureau of Mines, June (1957).
Grossman: "Machinable Glass-Ceramics Based on Tetrasilicic Mica", J. Amer. Ceramic Soc., 55, [9], 446-449 (1972) [TP 785 A62].

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