US 12,391,860 B2
Thermal-conductive silicone composition
Keita Kitazawa, Annaka (JP); Wataru Toya, Annaka (JP); Ayako Yamaguchi, Toyota (JP); Koji Nakanishi, Kounan (JP); Ryo Miyazaki, Toyota (JP); and Masataka Deguchi, Nagoya (JP)
Assigned to SHIN-ETSU CHEMICAL CO., LTD., Tokyo (JP)
Appl. No. 17/786,665
Filed by SHIN-ETSU CHEMICAL CO., LTD., Tokyo (JP)
PCT Filed Sep. 30, 2020, PCT No. PCT/JP2020/037190
§ 371(c)(1), (2) Date Jun. 17, 2022,
PCT Pub. No. WO2021/131212, PCT Pub. Date Jul. 1, 2021.
Claims priority of application No. 2019-231199 (JP), filed on Dec. 23, 2019.
Prior Publication US 2023/0053865 A1, Feb. 23, 2023
Int. Cl. C09K 5/14 (2006.01)
CPC C09K 5/14 (2013.01) 8 Claims
 
1. A thermal-conductive silicone composition comprising:
(A) a crosslinked silicone gel comprising the following component (a) and component (b), wherein the component (A) is contained in an amount of 0.5 to 2.5 mass % relative to a total amount of the composition,
(a) an organopolysiloxane having at least two aliphatic unsaturated hydrocarbon groups per molecule, and having a kinematic viscosity at 25° C. of 10,000,000 mm2/s or more, and
(b) an organohydrogenpolysiloxane having two or more silicon-bonded hydrogen atoms per molecule in such an amount that a ratio of the number of the SiH groups to a total number of the aliphatic unsaturated hydrocarbon groups in the component (a) ranges from 1 to 3;
(B) a hydrolysable organopolysiloxane compound shown by the following general formula (1) and contained in an amount of 12.5 to 19.5 mass % relative to the total amount of the composition,

OG Complex Work Unit Chemistry
wherein R1, s are identical to or different from one another, and each represent a monovalent hydrocarbon group having 1 to 10 carbon atoms but having no aliphatic unsaturated bond and optionally having a substituent, and “m” represents an integer of 5 to 100; and
(C) aluminum nitride particles having an average particle size of 0.5 μm or more and 1.5 μm or less and contained in an amount of 80 to 85 mass % relative to the total amount of the composition, wherein a content of coarse particles in the aluminum nitride particles is 1.0 volume % or less relative to the entire aluminum nitride particles, the coarse particles having particle sizes of 10 μm or more in a particle size distribution by laser diffraction.