Novel fine particulate synthetic chalcoalumite compounds, process for their production, and heat insulator and agricultural film containing the fine particulate synthetic chalcoalumite compounds

摘要

Novel, fine particulate synthetic chalcoalumite, process for preparation thereof, and a heat insulating agent and agricultural film containing said fine, particulate synthetic chalcoalumite. The above objects are met by synthetic chalcoalumite represented by formula (1) below: (M12+)a-x(M22+)xAl3+4(OH)b(An-)c . mH2O (in which M12+ stands for Zn2+ or Cu2+, M22+ is at least one divalent metal ion selected from Ni 2+, Co2+, Cu2+, Zn2+ and Mg2+, a is 0.3 a 2.0 (with the proviso that M1 and M2 are not the same), x is 0 /= x 1.0, b is 10 b 14, An- is at least one selected from SO42-, HPO42-, CO32-, SO32-, HPO32-, NO3-, H2PO4-, Cl-, OH- and silicic ion, c is 0.4 c 2.0 and m is 0-4), which has an average secondary particle diameter of not more than about 3 mu m and a BET specific surface area of not more than about 30 m2/g; resin compositions containing the same; and agricultural film composed of said resin compositions.