| 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: (M 1 2+)a-x(M2 2+)x Al3+4 (OH)b (A n-)c ~mH2O (1) (in which M1 2+ stands for Zn z+ or Cu 2+, M2 2+ is at least one divalent metal ion selected from Ni 2+, Co 2+, Cu 2+, Zn 2+ and Mg 2+, 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, A n- is at least one selected from SO 4 2-, HPO 4 2-, CO 3 2-, SO 3 2-, HPO3 2-, NO 3-, 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. |
