PURPOSE: To provide an inorganic sol and an inorganic film having excellent toughness, flexibility and heat-resistance, and containing a freely swelling fluorine mica having specific chemical composition.
CONSTITUTION: The desired inorganic sol and the inorganic film prepared therefrom can be produced by using a freely swelling fluorine mica having the chemical composition of formula (Y is Mg2+ which may be substiuted partly with Li+, Fe2+, Ni2+, Mn2+, Al3+ or Fe3+) as a component. The average particle diameter of the fluorine mica is preferably 0.1W15μm, and the rotational viscosity of the inorganic sol is preferably ≥10cps. Preferably an organic polymer film having a 5% weight reduction temperature of ≥400°C is laminated to one surface of the inorganic film. The thickness ratio of the organic polymer film to the inorganic film is preferably 0.1W0.2.
ANDOU AKITSUGU
ABE KOICHI
KAWAKAMI KENICHI
TORAY INDUSTRIES