PURPOSE: To obtain the title composition giving a release sheet which has excellent solvent resistance, heat resistance, reusability, and releasability, and is suitable as a release sheet used in a process of making a suede-like synthetic leather of high dullness, by using a finely divided organic polymer and finely divided inorganic particles as its constituents.

CONSTITUTION: The title composition is obtained by mixing 7W12wt% finely divided organic polymer (A) which comprises a heat-resistant resin, such as a thermosetting acrylic resin or a crosslinked acrylic-melamine resin, having an average particle diameter of 2W5μm, 1W5wt% finely divided inorganic particles (B) of, e.g., SiO2; 10W20wt% binder resin (C) comprising, e.g., a mixture of a thermosetting acrylic resin with a melamine resin; 40W70wt% carrier (D) comprising any one of or a mixture of, e.g., water and isopropanol in a water-base system, or xylene, methyl ethyl ketone, trichloroethane, and ethyl acetate in a solvent-base system; and 5W15wt% release agent (E) comprising, e.g, a fluorine compound, a silicone compound or an (alkyl) phosphate.