| 摘要 |
It is an object of the present invention to provide hydrotalcite which can inhibit a white discoloration by water of a polyolefin film for agricultural uses, a blooming to the surface of a vinyl chloride resin film, a reduction in electric resistance in the case of using the hydrotalcite as a stabilizer of a vinyl chloride resin for covering wires, the occurrence of die drool in the case of using the hydrotalcite as a neutralizer of an acid catalyst residue in a polyolefin resin or a copolymer thereof, and coloring (yellowing) in extrusion in preparing pellets and can be suitably used as a resin additive, a method of producing the same and a synthetic resin composition containing the same. Hydrotalcite expressed by the following formula (1); [(Mg)x(Zn)y]1−z(Al)z(OH)2(An−)z/n.mH2O   (1) in the formula An− represents an anion having a valence of n, and x, y, z and m are values which satisfy the following expressions, 0.5≦̸x≦̸1, 0≦̸y≦̸0.5, x+y=1, 0.1≦̸z≦̸0.5, 0≦̸m<1, and the hydrotalcite has a sodium content of 100 ppm or less and is used as a resin additive.
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