THERMOSETTING SILICONE COMPOSITION AND LIQUID GIVING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a thermosetting silicone composition giving a cured product which can be suitably used for sealing an LED chip and has good curability and high gas barrier properties.SOLUTION: A thermosetting silicone composition is a mixture of: (A) a phenylmethyl silicone which has, in one molecule, at least two silicon atoms to which a hydroxyl group or an alkoxy group is bonded; (B) a silane or siloxane compound which has, in one molecule, three or more hydroxyl groups or alkoxy groups and in which an organic group bonded to a silicon atom is a methyl group; and (C) a Ga compound and a Zr compound. The thermosetting silicone composition contains phenyl groups and methyl groups which are bonded to silicon atoms at a molar ratio of 2:8 to 4.5:5.5 (the number of moles of the phenyl group to the number of moles of the methyl group).