Disclosed is an inorganic-organic composite flame retardant composition which contains an inorganic hydroxide having a polymer layer and an organic resin. The polymer layer is formed through graft polymerization and has an average thickness of not less than 3 nm. When a shaped article is formed by using such a composition, the shaped article can have a sufficient flame retardance while being prevented from decrease in acid resistance, increase in dielectric constant or the like.
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