INORGANIC OXIDE HOLLOW PARTICLE

To provide an inorganic oxide hollow particle having its relative dielectric constant reduced compared to the conventional art.SOLUTION: An inorganic oxide hollow particle has a plurality of independent spaces in which an outer shell-covered cavity is divided by one or more partitions. The particle comprises an inorganic oxide comprising 10 mass% or more and 40 mass% or less of boron oxide, 5 mass% or less of group 1 element oxide, 5 mass% or more and 50 mass% or less of calcium oxide, and less than 14 mass% of aluminum oxide.SELECTED DRAWING: Figure 1 【課題】比誘電率が従来よりも低い無機酸化物中空粒子を提供すること。【解決手段】外殻で覆われた空洞が１以上の隔壁によって区切られた複数の独立した空間を備え、１０質量％以上４０質量％以下のホウ素酸化物と、５質量％以下の第１族元素酸化物と、５質量％以上５０質量％以下のカルシウム酸化物と、１４質量％未満のアルミニウム酸化物とを含む無機酸化物により構成されている、無機酸化物中空粒子。【選択図】図１