| abstract |
The present invention is a curable polysilsesquioxane compound comprising one structural unit or two or more structural units represented by R 1 SiO 3/2 , the curable polysilsesquioxane compound having a 29 Si nuclear magnetic resonance spectrum that has a first peak top within a range of −60 ppm or more and less than −54 ppm, has a second peak top within a range of −70 ppm or more and less than −61 ppm, and substantially does not have a peak within a range of −53 ppm or more and less than −45 ppm, andn a method for producing the curable polysilsesquioxane compound, and a curable composition comprising the curable polysilsesquioxane compound and a silane coupling agent, and a cured product obtained by heating the curable composition, and a method for using the curable polysilsesquioxane compound or the curable composition, as an optical device-securing material. |