US 11,993,679 B2
Thermally conductive sheet
Hiroki Kudoh, Kawaguchi (JP); Taku Sasaki, San Jose, CA (US); Kana Hattori, Nishinomiya (JP); Kazuyuki Yahara, Nagaokakyo (JP); and Yasunari Kusaka, Osaka (JP)
Assigned to SEKISUI POLYMATECH CO., LTD., Saitama (JP)
Appl. No. 17/252,508
Filed by SEKISUI POLYMATECH CO., LTD., Saitama (JP)
PCT Filed Jun. 18, 2019, PCT No. PCT/JP2019/024112
§ 371(c)(1), (2) Date Dec. 15, 2020,
PCT Pub. No. WO2019/244889, PCT Pub. Date Dec. 26, 2019.
Claims priority of application No. 2018-119377 (JP), filed on Jun. 22, 2018.
Prior Publication US 2021/0261737 A1, Aug. 26, 2021
Int. Cl. F28F 21/06 (2006.01); C08G 77/06 (2006.01); C08G 77/18 (2006.01); C08J 5/18 (2006.01); C08K 7/06 (2006.01); H05K 7/20 (2006.01)
CPC C08G 77/18 (2013.01) [C08G 77/06 (2013.01); C08J 5/18 (2013.01); C08K 7/06 (2013.01); H05K 7/2039 (2013.01); F28F 21/06 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A thermally conductive sheet comprising:
a polymer matrix; and
an anisotropic filler,
wherein a first portion of the anisotropic filler is oriented in a thickness direction,
wherein a second portion of the anisotropic filler is disposed in such a way as to lie down near a surface of the thermally conductive sheet, the surface being observed with an optical microscope,
wherein the second portion of the anisotropic filler is 1 to 45% of a total number of the anisotropic fillers observed in an observation image observed with the optical microscope, and
wherein a proportion of the anisotropic filler which is disposed in such a way as to lie down near the surface is larger than a proportion of the anisotropic filler which is disposed in such a way as to lie down inside the thermally conductive sheet.