| abstract |
The present invention provides a silicone composition capable of compressing a heat dissipating grease to a predetermined thickness after a reflow process exposed to a high temperature of 200 ° C. or higher and sufficiently spreading the applied heat dissipating grease over the entire heat generating part. (A) an organopolysiloxane having at least two aliphatic unsaturated hydrocarbon groups in one molecule; (B) a filler containing aluminum powder and zinc oxide powder, (C) two or more organohydrogenpolysiloxanes having hydrogen atoms bonded to silicon atoms in one molecule, (D) a sample containing a platinum group metal catalyst from 25 ° C. to 125 ° C. at 10 ° C./min, After raising the temperature from 125 ° C. to 145 ° C. at 2 ° C./min and from 145 ° C. to 150 ° C. at 0.5 ° C./min, the storage elastic modulus G ′ was measured by setting a program to maintain at 150 ° C. for 7,200 seconds. In this case, a silicone composition which gives a cured product in which the ratio of the storage elastic modulus after 3,600 seconds from the start of measurement and the storage elastic modulus after 7,200 seconds is 0.7 or less. [Selection figure] None |