Abstract: Provided is a gas barrier film including a layer of a resin composition (C) on at least one side of a substrate (D), wherein the resin composition (C) contains a water soluble or water dispersible polymer (A) and a swellable inorganic layered silicate (B), where the swellable inorganic layered silicate (B) satisfying expressions (1) and (2) below is used. 11.0?D?2.0 ?m (1), ??1.8 ?m (2), wherein D and a are a logarithmic average particle diameter of the swellable inorganic layered silicate (B) measured by laser diffraction and standard deviation of a particle size distribution thereof, respectively. This provides a gas barrier film including a resin composition layer, with a swellable inorganic layered silicate dispersed therein, having an extremely excellent gas barrier property and a method of producing a multilayer barrier film having the resin composition layer with extremely less irregularities on a surface thereof.

Abstract: The present invention provides an organic-coated synthetic mica powder excellent in feeling in use and water-repellent property by an organic coating layer from an organic surface treatment agent, which is firmly and chemically bound to the surface of the synthetic mica powder, and further provides, when an organosilicone having Si—H groups is used as the organic surface treatment agent, an organic-coated synthetic mica powder having very little hydrogen evolution due to residual Si—H groups. The organic-coated synthetic mica powder can be obtained by a producing method comprising a pretreatment process and a coating process, said pretreatment process comprising: contacting synthetic mica powder and an ammonium ion in water; carrying out solid-liquid separation to remove the liquid phase; and drying the solid phase at 200° C.

Abstract: A porous body of polysaccharide or polysaccharide-clay composite having fine pores, consisting essentially of a freeze-dried product of (a) an aqueous solution of at least one polysaccharide selected from the group consisting of starch, sodium alginate and carboxymethyl cellulose, or its derivative, or (b) a composite sol comprising such an aqueous solution and a clay sol.