Importance

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Abstract

The present invention relates to a curable silicone composition comprising: (A) an organopolysiloxane represented by the average unit formula: (R¹₃SiO_1/2)_a(R¹₂SiO_2/2)_b (R²SiO_3/2)_c (R³SiO_3/2)_d, wherein, R¹ are the same or different alkyl groups having from 1 to 12 carbons, alkenyl groups having from 2 to 12 carbons, aryl groups having from 6 to 20 carbons, or aralkyl groups having from 7 to 20 carbons, provided that at least two R¹ in a molecule are the alkenyl groups; R² is an aryl group having from 6 to 20 carbons or an aralkyl group having from 7 to 20 carbons; R³ is an alkyl group having from 1 to 12 carbons; and a, b, c, and d are respectively numbers satisfying: 0.01≦a≦0.5, 0≦b≦0.7, 0.01≦c<0.7, 0.1≦d<0.9, and a+b+c+d=1; (B) a linear organopolysiloxane having at least two silicon-bonded alkenyl groups and at least one silicon-bonded aryl group in a molecule; (C) an organopolysiloxane having at least two silicon-bonded hydrogen atoms in a molecule; (D) a hydrosilylation-reaction catalyst. The curable silicone composition has excellent handling/workability and forming a cured product with a high refractive index and low gas permeability when cured.

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First Claim