PURPOSE: To simply produce a high-rigidity elastomer containing an inorganic filler having high general-purpose properties due to its excellence in heat and impact resistances at a low cost by finely dispersing an inorganic filler at the level of the nanometer order in an elastomer according to a specific method.
CONSTITUTION: (B) An organic cation (preferably a quaternary ammonium salt, etc., such as an n-alkyl ammonium salt) is initialy brought into contact with (A) a layer compound (e.g. montmorillonite or tetrasilicic mica) and the resultant mixture is then swelled with (C) an organic solvent (preferably an aliphatic alcohol, etc., having a structure of an electron donor such as methanol). The swollen material is subsequently kneaded with (D) an elastomer (e.g. an ethylene-propylene copolymer) by using, e.g. a twin-screw extruder. The components (B) and (C) are preferably added in respective amounts of 1-10 equiv. based on the cation exchange capacity of the component (A). Furthermore, the component (C) is preferably vaporized to carry out the mixing during a period without destroying and separating an infinite swollen structure and the dispersion is preferably performed by shearing.
FUJITA TAKETOSHI
HOSOKAWA TERUO
TAMURA TAKASHI
INOUE HIROFUMI
MOGI YOSHIHIRO
SHOWA DENKO KK
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