HYDROTALCITE, PRODUCTION METHOD THEREOF, HEAT RETAINING AGENT FOR AGRICULTURAL FILM AND AGRICULTURAL FILM

摘要

To provide a hydrotalcite having a large amount of silicate ions contained between layers, with its primary particles having a smaller average horizontal width and with little aggregation between the primary particles.SOLUTION: A hydrotalcite that fulfills (A) to (C) below and is represented by (Formula 1) below is provided. (M)(M)(OH)(A)mHO (Formula 1) (where Mis at least one divalent metal, Mis at least one trivalent metal, Ais a condensed silicate ion of n valence, 0.17≤x≤0.36, 0≤m≤10, and n is an integer of 1 or greater) (A) Molar ratio of Si to Mis 1.3 or greater; (B) Primary particles have an average horizontal width of 0.1 μm to 0.7 μm as determined by SEM method; (C) Monodispersion represented by the formula below is 50% or more: Monodispersion(%)=(average horizontal width of primary particles as determined by SEM method/average horizontal width of secondary particles as determined by laser diffraction method)×100.SELECTED DRAWING: Figure 1