公开(公告)号：US11267706B2

公开(公告)日：2022-03-08

申请号：US16474284

申请日：2017-12-21

申请人： SHOWA DENKO K.K.

发明人： Yuki Otsuka ,  Masaru Fukasawa

IPC分类号： C01B21/064 ,  C01B35/12 ,  C01B32/20 ,  C01B32/991 ,  C04B35/583

摘要： An hBN powder containing an aggregate of primary particles of hBN, the hBN powder having a ratio of an average longer diameter (L1) to an average thickness (d1) of the primary particles, [L1/d1], of 10 to 25, a tap density of 0.80 g/cm3 or more, and a BET specific surface area of less than 5.0 m2/g, in which a particle size distribution curve showing a frequency distribution based on volume of the hBN powder is a bimodal distribution curve having a first peak and a second peak in a range of a particle size of 500 μm or less and having a peak height ratio of a second peak height (HB) to a first peak height (HA), [(HB)/(HA)], of 0.90 or less, a method for producing the same, and a resin composition and a resin sheet each comprising the hBN powder.

公开(公告)号：US11577957B2

公开(公告)日：2023-02-14

申请号：US16473455

申请日：2017-12-26

申请人： SHOWA DENKO K.K.

发明人： Yuki Otsuka ,  Masaru Fukasawa

IPC分类号： C01B21/064 ,  C08L101/00 ,  C08K3/38

摘要： A hexagonal boron nitride powder having an average longer diameter (L) of primary particles in the hexagonal boron nitride powder of more than 10.0 μm and 30.0 μm or less, an average thickness (D) of the primary particles in the hexagonal boron nitride powder of 1.0 μm or more, a ratio of the average longer diameter (L) to the average thickness (D), [L/D], of 3.0 or more and 5.0 or less, and a content of primary particles having a ratio of a longer diameter (1) to a thickness (d), [l/d], of 3.0 or more and 5.0 or less of 25% or more, a method for producing the hexagonal boron nitride powder, and a resin composition and a resin sheet each containing the hexagonal boron nitride powder.

公开(公告)号：US11305993B2

公开(公告)日：2022-04-19

申请号：US16474284

申请日：2017-12-21

申请人： SHOWA DENKO K.K.

发明人： Yuki Otsuka ,  Masaru Fukasawa

IPC分类号： C01B21/064 ,  C01B35/12 ,  C01B32/20 ,  C01B32/991 ,  C04B35/583

摘要： An hBN powder containing an aggregate of primary particles of hBN, the hBN powder having a ratio of an average longer diameter (L1) to an average thickness (d1) of the primary particles, [L1/d1], of 10 to 25, a tap density of 0.80 g/cm3 or more, and a BET specific surface area of less than 5.0 m2/g, in which a particle size distribution curve showing a frequency distribution based on volume of the hBN powder is a bimodal distribution curve having a first peak and a second peak in a range of a particle size of 500 μm or less and having a peak height ratio of a second peak height (HB) to a first peak height (HA), [(HB)/(HA)], of 0.90 or less, a method for producing the same, and a resin composition and a resin sheet each comprising the hBN powder.

公开(公告)号：US11078080B2

公开(公告)日：2021-08-03

申请号：US16647756

申请日：2019-06-12

申请人： SHOWA DENKO K.K.

发明人： Boanerges Thendie ,  Masaru Fukasawa

IPC分类号： C01B21/064

摘要： A hexagonal BN powder including aggregates of primary particles of hexagonal BN containing boron and oxygen as impurity elements at a content of 1.00 to 30.00% and 0 to 1.00% by mass, respectively, which has a peak A in a predetermined particle diameter range and a 50% volume cumulative particle diameter D50 (d1) of 30.0 to 200.0 μl in a particle size distribution curve, and in which a ratio of a height (a1) of the peak A before treatment to a height (a2) of the peak A after treatment is 0.80 to 1.00 and a ratio of D50 (d1) before treatment to D50 (d2) after treatment is 0.80 to 1.00 when the hexagonal BN powder is ultrasonically treated under a predetermined condition for 1 minute. Also disclosed is a method for producing the hexagonal BN powder, a composition and a heat dissipation material.

公开(公告)号：US10781352B2

公开(公告)日：2020-09-22

申请号：US15744426

申请日：2016-08-19

申请人： SHOWA DENKO K.K.

发明人： Yuki Otsuka ,  Masaru Fukasawa

IPC分类号： C09K5/14 ,  C08K3/38 ,  C08L101/00 ,  C01B21/064 ,  C08K7/00

摘要： A hexagonal boron nitride (hBN) powder containing an aggregate of primary particles of hBN, in which the powder has a primary particle size of less than 10 μm, a ratio of an average longer diameter (L1) to an average thickness (d1) of the primary particles, [L1/d1], of 5.0 or more and 20 or less, and a BET specific surface area of less than 10 m2/g. The powder has one maximum peak in a range of a particle size of 45 μm or more and 150 μm or less in a particle size distribution curve of a hexagonal boron nitride powder classified to have a particle size of 45 μm or more and 106 μm or less, and has a decrease rate of the maximum peak of 10% or more and less than 40%.