| abstract |
Novel, fine particulate synthetic chalcoalumite, process fornpreparation thereof, and a heat insulating agent and agriculturalnfilm containing said fine, particulate synthetic chalcoalumite. n The above objects are met by synthetic chalcoalumitenrepresented by formula (1) below:n (M 1 2+ ) a-x (M 2 2+ ) x Al 3+ 4 (OH) b (A n- ) c · mH 2 O n (in which M 1 2+ stands for Zn 2+ or Cu 2+ , M 2 2+ is at least one divalent metal ion selected from Ni 2+ ,nCo 2+ , Cu 2+ , Zn 2+ and Mg 2+ , a is 0.3 < a < 2.0 (with the proviso that M 1 and M 2 are notnthe 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- ,nSO 3 2- , HPO 3 2- , NO 3 - , H 2 PO 4 - , Cl - , OH - and silicic ion, c is 0.4 < c < 2.0 and m is 0-4), nwhich has an average secondary particle diameter of not more thannabout 3 µm and a BET specific surface area of not more than aboutn30 m 2 /g; resin compositions containing the same; and agriculturalnfilm composed of said resin compositions. |