Silicone resin composition and optical semiconductor device using the composition
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsTsutomu KASHIWAGI, Yoshihira Hamamoto
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Abstract
A silicone resin composition that exhibits low gas permeability and is suitable for encapsulating optical semiconductors. The composition includes: (A) an organopolysiloxane having a specific structure containing two or more alkenyl groups, (B) an organohydrogenpolysiloxane composed of two organohydrogenpolysiloxanes having specific structures, in which the mass ratio between the two organohydrogenpolysiloxanes is within a range from 10:90 to 90:10, in an amount that provides 0.4 to 4.0 mols of silicon atom-bonded hydrogen atoms within the component (B) per 1 mol of alkenyl groups within the component (A), and (C) an addition reaction catalyst.
Claims8
A silicone resin composition comprising:
- (A) an organopolysiloxane containing two or more alkenyl groups within each molecule, represented by an average composition formula (1) shown below:
- (R1SiO3/2)a(R22SiO)b(R23SiO1/2)c(R3SiO3/2)d (1)
- wherein R1 represents an aryl group of 6 to 14 carbon atoms, R2 represents a substituted or unsubstituted monovalent hydrocarbon group, R3 represents a substituted or unsubstituted monovalent hydrocarbon group other than an aryl group, a represents a number of 0.3 to 0.9, b represents a number of 0 to 0.5, c represents a number of 0.05 to 0.7, and d represents a number of 0 to 0.2, provided that a+d is a number of 0.3 to 0.9 and a+b+c=1.0,
- (B) an organohydrogenpolysiloxane, composed of an organohydrogenpolysiloxane (B-1) represented by a general formula (3) shown below and an organohydrogenpolysiloxane (B-2) represented by a general formula (4) shown below in a mass ratio (B-1):(B-2) within a range from 10:90 to 90:10,
- in an amount that provides 0.4 to 4.0 mols of silicon atom-bonded hydrogen atoms within the component (B) per 1 mol of alkenyl groups within the component (A):
- wherein R1 and R2 are as defined above and n represents an integer of 1 or greater, and
- (C) an effective amount of an addition reaction catalyst.
Dependencies are inferred from the claim text.