公开(公告)号：US20240254313A1

公开(公告)日：2024-08-01

申请号：US18560463

申请日：2022-05-06

Applicant: DENKA COMPANY LIMITED

Inventor： Teruhiro AIKYO ,  Takaaki MINAMIKAWA ,  Yasuaki HATAYAMA ,  Naoto HAYASHI

IPC: C08K3/36 ,  C01B33/12 ,  H01L23/29

CPC classification number: C08K3/36 ,  C01B33/12 ,  H01L23/295 ,  C01P2006/12 ,  C08K2201/005 ,  C08K2201/006

Abstract: Provided are a silica powder with a particle size of 2.0 μm or less which does not readily aggregate, has favorable handling, and readily disperses when mixed with a resin; and a resin composition and a semiconductor sealing material comprising the silica powder.
The silica powder has a volume-based cumulative size (D50) of 2.0 μm or less and a maximum particle size (Dmax) of 5.0 μm or less as measured by a grind gauge with the following method.
(Measurement Method)
The degree of dispersion of the silica powder in the epoxy resin is evaluated in a resin composition obtained by adding 67 parts by mass of the silica powder to 100 parts by mass of a bisphenol F-type liquid epoxy resin with a distribution map method using a grind gauge and the maximum particle size (Dmax) is measured in accordance with JIS K 5600-2-5. Further, the same evaluation is performed five times and the average value thereof is employed.

公开(公告)号：US20240190639A1

公开(公告)日：2024-06-13

申请号：US18279409

申请日：2022-03-11

Applicant: DENKA COMPANY LIMITED

Inventor： Hiroyuki SHIOTSUKI ,  Teruhiro AIKYO ,  Takashi FUKUDA

IPC: B65D81/24 ,  B65B31/00 ,  B65D81/20 ,  C01B33/18 ,  C01F5/02 ,  C09C1/02 ,  C09C1/30 ,  C09C3/12

CPC classification number: B65D81/24 ,  B65B31/00 ,  B65D81/2084 ,  C01B33/18 ,  C01F5/02 ,  C09C1/028 ,  C09C1/3081 ,  C09C3/12

Abstract: A method for producing a packaging body of the present invention includes a production step of producing a metal oxide powder, and a sealing step of placing the metal oxide powder in a bag that is filled with at least one gas selected from the group consisting of a noble gas, nitrogen gas, oxygen gas, and dry air, followed by sealing the bag, the metal oxide powder being a silica powder or a magnesia powder, the bag having a moisture permeability as measured according to JIS Z 0222-1959 of 0.30 g/(m2·day) or less.

公开(公告)号：US20230331572A1

公开(公告)日：2023-10-19

申请号：US18028956

申请日：2021-09-24

Applicant: DENKA COMPANY LIMITED

Inventor： Teruhiro AIKYO ,  Tomohiro KAWABATA ,  Jun YAMAGUCHI ,  Atsushi YAMASHITA

IPC: C01F7/02 ,  C08K7/18 ,  C08L83/04

CPC classification number: C01F7/02 ,  C08K7/18 ,  C08L83/04 ,  C01P2004/32 ,  C01P2004/51 ,  C08K2201/003

Abstract: A spherical alumina powder having a maximum particle diameter showing a maximum peak in the range of 35 to 70 μm, a frequency of 5 to 15%, and an accumulated value of frequencies respectively at 20 particle diameter points, obtained by dividing a particle diameter range of 1 to 20 μm equally into 19 sections, of 3 to 17% by volume, the powder providing a ratio (VY/VX) of a viscosity VY of a resin composition Y to a viscosity VX of a resin composition X of 0.85 or more, composition X containing the powder and a vinyl group-containing polymethylsiloxane, the powder being contained in an amount of 88.1% by mass, the resin composition Y being the same as X except for containing the same powder as in composition X in an amount of 79.3% by mass and containing a powder for testing in an amount of 8.8% by mass.

公开(公告)号：US20210094883A1

公开(公告)日：2021-04-01

申请号：US16622103

申请日：2018-10-19

Applicant: Denka Company Limited

Inventor： Teruhiro AIKYO ,  Yasutaka OSHIMA ,  Hiroyuki OHASHI ,  Koichi FUJI ,  Yosuke GOTO

IPC: C04B35/622

Abstract: The present invention relates to an alumina fiber having the content of sodium oxide of 530 to 3,200 ppm and a mass ratio (A/B) of the content (A) of the sodium oxide to the content (B) of calcium oxide of 5 to 116.