Patent ID: 9048406
Filing Date: 2015-06-02
Classification: C08G,C08K,C08L,H01L

Abstract:
1. A curable silicone composition comprising: (A) 100 parts by mass of an organopolysiloxane represented by the following average unit formula: (B) 5 to 50 parts by mass of an organopolysiloxane having 10 or less silicon atoms, wherein 30 to 60 mole % of all silicon atom-bonded organic groups in the (B) component are alkenyl groups having from 2 to 6 carbons; (c) 0 to 40 parts by mass of an organopolysiloxane represented by the following general formula: (D) an organopolysiloxane having at least 2 silicon atom-bonded hydrogen atoms in a molecule, wherein the content of phenyl groups in all silicon atom-bonded organic groups in this component is at least 20 mole %, in an amount that provides 0.3 to 1.5 moles of the silicon atom-bonded hydrogen atoms in the (D) component per 1 mole of the total amount of alkenyl groups in components (A) to (C); (E) an organopolysiloxane having at least 2 silicon atom-bonded hydrogen atoms in a molecule, wherein the content of phenyl groups in all silicon atom-bonded organic groups in the (E) component is less than 20 mole %, in an amount that provides 0.2 to 0.8 moles of the silicon atom-bonded hydrogen atoms in the (E) component per 1 mole of the total amount of alkenyl groups in components (A) to (C); (F) a hydrosilylation reaction catalyst in an amount sufficient to accelerate a hydrosilylation reaction between the alkenyl groups in components (A) to (C) and the silicon atom-bonded hydrogen atoms in components (D) and (E); (G) a white pigment in an amount of at least 25 parts by mass per 100 parts by mass of the total amount of components (A) to (F); and (H) an inorganic filler other than a white pigment in an amount of at least 40 parts by mass per 100 parts by mass of the total amount of components (A) to (F), wherein the content of the total amount of components (G) and (H) is not more than 300 parts by mass per 100 parts by mass of the total amount of components (A) to (F).