公开(公告)号：US20220346280A1

公开(公告)日：2022-10-27

申请号：US17762451

申请日：2020-09-24

Applicant: DENKA COMPANY LIMITED

Inventor： Kosuke WADA ,  Masahide KANEKO ,  Ryozo NONOGAKI

IPC: H05K7/20

Abstract: A heat-radiating sheet having a volume resistivity of 1.0×109 Ω·cm or more as measured by a direct current voltage of 500 V according to JIS K6911 after being impregnated with an antifreeze containing 98% by mass or more of ethylene glycol at a temperature 25° C. for 250 hours. It is possible to provide a heat-radiating sheet having high tolerance against gasoline and engine oil.

公开(公告)号：US20220344242A1

公开(公告)日：2022-10-27

申请号：US17762502

申请日：2020-09-24

Applicant: DENKA COMPANY LIMITED

Inventor： Kosuke WADA ,  Masahide KANEKO ,  Ryozo NONOGAKI

IPC: H01L23/373 ,  C09K5/14 ,  C08L83/04 ,  C08J5/24

Abstract: A heat-radiating sheet, in which a rate of reduction (%) ((R1-R2)/R1×100) of a thermal resistance (R2) (° C./W) of the heat-radiating sheet as measured when tightened at a tightening torque of 6 kgf·cm by using a screw after being impregnated in an antifreeze containing 98% by mass or more of ethylene glycol at a temperature of 25° C. for 500 hours relative to a thermal resistance (R1) (° C./W) of the heat-radiating sheet as measured when tightened at a tightening torque of 6 kgf·cm by using a screw is 30% or less. It is possible to provide a heat-radiating sheet having high tolerance against gasoline and engine oil.

公开(公告)号：US20220392824A1

公开(公告)日：2022-12-08

申请号：US17762235

申请日：2020-09-24

Applicant: DENKA COMPANY LIMITED

Inventor： Kosuke WADA ,  Masahide KANEKO ,  Ryozo NONOGAKI

IPC: H01L23/373 ,  H01L23/367

Abstract: A heat-radiating sheet, in which when after sandwiching a heat-radiating grease between a heat-radiating sheet arranged on an aluminum plate and a glass plate, a heat cycle test is performed 100 cycles, an area ratio of an area of the heat-radiating grease after performing the heat cycle test of 100 cycles to an area of the heat-radiating grease before performing the heat cycle test is 1.0 to 2.0. A heat-radiating sheet laminate includes a heat-radiating sheet and a heat-radiating grease layer formed on the surface of the heat-radiating sheet. A structure includes the heat-radiating sheet, a heat-generating element, and the heat-radiating grease intervening between the heat-radiating sheet and the heat-generating element. A heat-radiating treatment method of a heat-generating element includes a step of applying a heat-radiating grease on the heat-radiating sheet and a step of arranging a heat-generating element on the heat-radiating sheet having the heat-radiating grease applied thereon.

公开(公告)号：US20220278020A1

公开(公告)日：2022-09-01

申请号：US17636482

申请日：2020-08-18

Applicant: DENKA COMPANY LIMITED

Inventor： Kosuke WADA ,  Masahide KANEKO ,  Ryozo NONOGAKI

IPC: H01L23/373 ,  H01L23/42 ,  C09K5/00

Abstract: A heat-diffusion sheet when a needle electrode having a cone having a height of 3 mm and a bottom surface diameter of 0.75 mm at a distal end section, wherein a 2.0-kV current voltage having a frequency of 60 Hz, is penetrated stepwise every 10 μm but also retained for 60 seconds before the penetration, a distance between the distal end of the needle electrode and an aluminum plate at the time of dielectric breakdown of the heat-diffusion sheet is larger than 0 μm and 80 μm or less, or the needle electrode short-circuits the aluminum plate without dielectric breakdown of the heat-diffusion sheet. The method includes a step of pre-heating a composition for heat-diffusion sheet at a pre-heating temperature lower than a curing starting temperature; and a curing step of heating the composition for heat-diffusion sheet at a temperature of the curing starting temperature or higher while pressurizing the pre-heated composition sheet for heat-diffusion sheet.