Abstract: Provided is a method for producing composite oxide particles consisting of spherical particles having a predetermined average primary particle diameter within a range of 230 to 350 nm, wherein 90% or more of a total number of the spherical particles have primary particle diameters within a range of the predetermined average primary particle diameter plus or minus 5%, each particle constituting the spherical particles is a core-shell particle comprising a silica-based composite oxide particle and a silica layer that coats a surface of the silica-based composite oxide particle, and the silica layer has an average thickness of 3 to 15 nm, and a production method thereof. Additionally, a curable composition comprising such composite oxide particles is provided.

Abstract: The present invention provides a tooth cleaning composition containing a weakly acidic hypochlorite solution that has an effective chloride concentration of 100-2000 (mass ppm) and a pH of 3.0-6.5.

Abstract: Provided are a composite type heat insulator having an excellent heat insulating properties at high temperatures regardless of its thin body, and a method for producing the same. The composite type heat insulator comprises a first and a second cloths composed of silica fibers having a hydroxyl group; and a heat insulating layer sandwiched between the first and the second cloths. The heat insulating layer contains a silica aerogel and silica staple fibers having a fiber length of 0.5 to 5 mm. The heat insulating layer may optionally contain an infrared absorber and/or a film-forming inorganic binder.

Abstract: A thin and lightweight refractory insulating sheet comprising a refractory bag and a layered type thermal insulator in the bag is disclosed. The layered type thermal insulator comprises a thermal energy consumption layer, a reflector and a graphite layer, and can efficiently attenuate thermal energy by conducting the thermal energy in all directions of the plane even when locally heated, and utilizing the thermal energy for vaporization of the water generated from the thermal energy consumption layer.