Abstract: In a method for producing an oil-in-water emulsion, a jet of an oil-in-water pre-emulsion (L1) containing an oil phase dispersed in a first aqueous phase is added to a second aqueous phase (L2).

Abstract: A method for producing a ceramide microparticle dispersion causes a first mixture in a liquid state containing a ceramide and sterols and a second mixture in a liquid state containing water to separately flow, merges the first and second mixtures together, and passes a fluid formed by merging the first and second mixtures together through a small hole having a hole diameter of 0.03 mm or larger and 20 mm or smaller. A mass ratio of a content of a water-soluble organic solvent to a content of the ceramide in the first mixture is 0 or more and 30 or less.

Abstract: The present invention relates to a method of suppressing coloration of catechins, which contains adding, to catechins, a water-soluble polymer forming a water-insoluble complex with catechins, as well as hydrogel particles containing a water-insoluble complex between catechins and a polymer forming a water-insoluble complex with catechins. Further, the present invention relates to a dentifrice composition containing hydrogel particles containing catechins and a polymer forming a water-insoluble complex with catechins, a binder and water.

Abstract: The present invention relates to a method of suppressing coloration of catechins, which contains adding, to catechins, a water-soluble polymer forming a water-insoluble complex with catechins, as well as hydrogel particles containing a water-insoluble complex between catechins and a polymer forming a water-insoluble complex with catechins. Further, the present invention relates to a dentifrice composition containing hydrogel particles containing catechins and a polymer forming a water-insoluble complex with catechins, a binder and water.

Abstract: Hydrogel particles include a continuous phase portion of non-crosslinked hydrogel and disperse phase portions dispersed in the continuous phase portion. Each of the disperse phase portions contains a solid oil and a liquid oil as an oil component, and titanium oxide particles dispersed therein. The solid oil of the oil component contains a higher alcohol and a solid paraffin, and the content of the solid oil in the disperse phase portion is 1 to 12 mass %. The hydrogel particles have a volume-average particle diameter of 10 to 300 ?m.

Abstract: A hydrogel particle contains a continuous phase portion of non-crosslinked hydrogel and a large number of disperse phase portions dispersed in the continuous phase portion. Each of the large number of disperse phase portions is a solid phase containing an oil component and particles of zinc oxide dispersed therein.

Abstract: Hydrogel particles include: (A) a water-insoluble complex containing catechins; (B) a compound which forms chelate together with divalent or trivalent metal ions; (C) a divalent or trivalent metal salt; (D) a gel-forming agent; and (E) water.

Abstract: Hydrogel particles include a continuous phase portion of non-crosslinked hydrogel and disperse phase portions dispersed in the continuous phase portion. Each of the disperse phase portions contains a solid oil and a liquid oil as an oil component, and titanium oxide particles dispersed therein. The solid oil of the oil component contains a higher alcohol and a solid paraffin, and the content of the solid oil in the disperse phase portion is 1 to 12 mass %. The hydrogel particles have a volume-average particle diameter of 10 to 300 ?m.

Abstract: A hydrogel particle contains a continuous phase portion of non-crosslinked hydrogel and a large number of disperse phase portions dispersed in the continuous phase portion. Each of the large number of disperse phase portions is a solid phase containing an oil component and particles of zinc oxide dispersed therein.

Abstract: The present invention relates to a method of suppressing coloration of catechins, which contains adding, to catechins, a water-soluble polymer forming a water-insoluble complex with catechins, as well as hydrogel particles containing a water-insoluble complex between catechins and a polymer forming a water-insoluble complex with catechins. Further, the present invention relates to a dentifrice composition containing hydrogel particles containing catechins and a polymer forming a water-insoluble complex with catechins, a binder and water.