Thermally conductive silicone composition and a cured product of same

摘要

Thermally-conductive silicone composition, a cured material of which does not impose stress to integrated-circuit packages even upon standing at high temperature, and semi-conductor device provided with cured material obtained by curing the composition, the composition comprising;(A) 100 parts by mass of an organopolysiloxane having ≧2 alkenyl groups per molecule and a dynamic viscosity at 25° C. of 10-100,000 mm2/s,;(B) an organohydrogenpolysiloxane of formula (1):;;(C) an organohydrogenpolysiloxane of formula (2):;;(D) an organohydrogenpolysiloxane of formula (3):;;(E) 400-3000 parts by mass of thermally conductive filler,;(F) a catalytic amount of platinum group metal catalyst, and;(G) 0.01-1 part by mass of reaction retardant,;wherein the variables in formulas (1)-(3) are as defined in the specification and the amounts of components (B)-(D) enable satisfaction of the relationships regarding Si—H groups and alkenyl groups in components (A)-(D) are as defined in the specification.

主权项

1. A silicone composition having a viscosity at 25 degrees C. of 10 to 1,000 Pa·s, and comprising
(A) 100 parts by mass of an organopolysiloxane having at least two alkenyl groups per molecule and a dynamic viscosity at 25 degrees C. of 10 to 100,000 mm2/s, (B) an organohydrogenpolysiloxane represented by the following formula (1): wherein n and m are positive integers which meet the equations:
10≦n+m≦100 and 0.01≦n/(m+n) ≦0.3, and R1 is, independently of each other, an alkyl group having 1 to 6 carbon atoms, (C) an organohydrogenpolysiloxane represented by the following formula (2): wherein p is a positive integer of from 5 to 1,000, and R2 is, independently of each other, an alkyl group having 1 to 6 carbon atoms, (D) an organohydrogenpolysiloxane represented by the following formula (3): wherein k is a positive integer of from 2 to 10; R is, independently of each other, a hydrogen atom or R4, provided that two of R are a hydrogen atom, wherein R4 is a group bonded to a silicon atom via a carbon atom or via a carbon atom and an oxygen atom and has a group selected from an epoxy group, an acryloyl group, a methacryloyl group, an ether group and a trialkoxysilyl group, R3 is, independently of each other, an alkyl group having 1 to 6 carbon atoms, (E) 400 to 3,000 parts by mass of a thermally conductive filler, (F) a catalytic amount of a platinum group metal catalyst, and (G) 0.01 to 1 part by mass of a reaction retardant, wherein amounts of components (B), (C) and (D) meet the following conditions:
a ratio, [the total number of Si—H groups in components (B), (C) and (D)]/[the number of alkenyl groups in component (A)], is in a range of 0.6 to 1.5;a ratio, [the total number of Si—H groups in components (C) and (D)]/[the number of Si—H groups in component (B)], is in a range of 1 to 10; anda ratio, [the number of Si—H groups in component (C)]/[the number of Si—H groups in component (D)], is in a range of 1 to 10.