| abstract |
An object of the present invention is to provide a polyorganopyloxane which can form a cured product having high surface hardness and heat resistance and which is excellent in flexibility and workability by curing.nThe present invention relates to a polyorganosilsesquioxane characterized by having a constituent unit represented by the following formula (1), and a constituent unit represented by the following formula (I) and a formula (II) below The molar ratio of the constituent unit shown in the formula [I(I) is a structural unit represented by the formula (II)] is 5 or more, and the total amount (100 mol%) of the constituent unit of the decane. The ratio of the constituent unit represented by the following formula (1) and the constituent unit represented by the following formula (4) is 55 to 100 mol%, the number average molecular weight is 1000 to 3000, and the molecular weight dispersion (weight average molecular weight/number The average molecular weight) is 1.0 to 3.0; [R1SiO3/2] (1)n[RaSiO3/2] (I)n[RbSiO(ORc)] (II)n[R1SiO(ORc)] (4). |