| abstract |
PROBLEM TO BE SOLVED: To provide a resin composition for sealing an optical element, which is excellent in transparency and UV resistance and excellent in heat-resistant coloring. [Means of solving] (R1-SiO 3/2) a- n (X1-SiO 3/2) n (I) (R1 is a hydrocarbon group or silyloxy group containing a carbon-carbon unsaturated bond. X1 is a monovalent organic group not containing an H-Si bond and a carbon-carbon unsaturated bond. A is 6-14. Even-numbered, n is a positive integer smaller than a.) Liquid silsesquioxane (A) and (R2-SiO 3/2 ) a- n (X2-SiO 3/2 ) n (II) (R2 represents a hydrogen atom or a monovalent organic group containing an H-Si bond. X2 is a monovalent organic group not containing an H-Si bond and a carbon-carbon unsaturated bond. A and n is the same as above.) A resin composition for encapsulating an optical element, containing, as a resin component, a liquid silsesquioxane (B) having a cage structure containing an H—Si bond represented by the formula: [Selection figure] None |