Abstract: An active ray-curable ink for ink jet, includes: a compound (A) represented by the structural formula (1): a compound (B) having a thioxanthone skeleton; a compound (C) having a triplet energy level (T3) between a triplet energy level (T1) of the compound (A) represented by the structural formula (1) and a triplet energy level (T2) of the compound (B) having a thioxanthone skeleton; a two or more functional radical polymerizable active ray-curable compound; and a coloring material, wherein a content of the two or more functional radical polymerizable active ray-curable compound is 50.0 mass % or more, a content of the coloring material is 0.1 mass % or more and 15.0 mass % or less, and the total content of the compound (A) represented by the structural formula (1) and the compound (B) having a thioxanthone skeleton is 0.1 mass % or more and less than 5.0 mass %.

Abstract: Hydrotalcite particles having an extremely small average secondary particle diameter and a production process therefor. A resin composition comprising hydrotalcite fine particles and having excellent transparency and a molded article thereof. The hydrotalcite fine particles have an average secondary particle diameter measured by a dynamic light scattering method of 5 to 100 nm.

Abstract: A process for producing hydrotalcite particles having an average secondary particle diameter of 1 to 100 nm. The production process is to produce hydrotalcite particles having an average secondary particle diameter measured by a frequency analyzing method of 1 to 100 nm, comprising reacting a mixed aqueous solution of a magnesium salt and an aluminum salt with an alkali substance and an interlaminar anion in a forced thin-film type micro-reactor having a reactive site clearance of 1 to 30 ?m, wherein the molar ratio of the alkali substance to the total of metal magnesium and metal aluminum is 2 to 15.

Abstract: Hydrotalcite particles having an extremely small average secondary particle diameter and a production process therefor. A resin composition comprising hydrotalcite fine particles and having excellent transparency and a molded article thereof. The hydrotalcite fine particles have an average secondary particle diameter measured by a dynamic light scattering method of 5 to 100 nm.

Abstract: Magnesium hydroxide fine particles having a nano-order particle size, a low carbon content, high whiteness and high transparency and a production process therefor. The magnesium hydroxide fine particles have an average secondary particle diameter measured by frequency analysis of 1 to 100 nm and a carbon content of less than 0.9 wt %.