Patent
US 11,577,957of Invention
Yuki OTSUKA
US
Copyright © 2026 Matter42. All rights reserved.
Patent
Atlas literature
Patent
US 11,577,957Patent drawings and their descriptions. Click a drawing to enlarge it.
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
: 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 p m and 30.0 p m or less; an average thickness (D) of the primary particles in the hexagonal boron nitride powder of 1.0 p m 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 an individual aspect ratio of a longer diameter (1) to a thickness (d), [l/d], of 3.0 or more and 5.0 or less o 60 % or more. Currently amended
: The hexagonal boron nitride powder according to claim 1, wherein the hexagonal boron nitride powder comprises an aggregate of two or more primary particles, and when the hexagonal boron nitride powder is put through a sieve having an opening of 106 p m, the hexagonal boron nitride powder passing through the sieve has a 50 % volume cumulative particle size D so (1) of 25 p m or more and 100 p m or less, and a dispersion liquid obtained by dispersing in water the hexagonal boron nitride powder passing through the sieve has a 50 % volume cumulative particle size D 5 o(2) of 50 p m or less after the dispersion liquid is subjected to an ultrasonic treatment for 3 minutes. Previously presented
: The hexagonal boron nitride powder according to claim 1, having a BET specific surface area of 2.0 m 2/g or less. Previously presented
: A resin composition comprising: the hexagonal boron nitride powder according to claim 1; and an organic matrix, wherein the composition has a content of the hexagonal boron nitride powder of 10 % by volume or more and 90 % by volume or less based on a total amount of the hexagonal boron nitride powder and the organic matrix. Withdrawn
: A method for producing the hexagonal boron nitride powder according to claim 1, the method comprising the following steps 1 to 3: Step 1: a step of firing a boron carbide powder at 1600 ° C or more and 2200 ° C or less under a nitrogen gas atmosphere; Step 2: a step of heating a fired product obtained in the step 1 at 500 0 C or more and less than 1500 ° C under an oxygen-containing gas atmosphere, thereby decarbonizing the fired product; and Step 3: a step of firing again a product after decarbonization, the product obtained in the step 2, at 1500 0 C or more and 2200 ° C or less under a nitrogen gas atmosphere. Withdrawn
. Canceled
Embodiments described in the patent, grouped by the materials and process steps they use.
2 materials3 process steps
Boron carbide powder (100 g, D50=13 μm, purity 95% by mass) was fired at 2000°C under nitrogen gas atmosphere for 10 hours (Step 1). The fired product was heated at 900°C under air atmosphere for 10 hours to decarbonize (Step 2). Step 3 involved re-firing of the decarbonized product under nitrogen gas atmosphere with addition of a boron compound (25 parts by mass).
Materials described outside the worked examples.
organic matrix
boron compound
B₂O(3+x)H2x (x=0 to 3)
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
average longer diameter (L) of primary particles | 10–30 μm | hBN |
average thickness (D) of primary particles | ≥ 1 μm |
Patent
Atlas literature
Patent
US 11,577,957Patent drawings and their descriptions. Click a drawing to enlarge it.
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
: 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 p m and 30.0 p m or less; an average thickness (D) of the primary particles in the hexagonal boron nitride powder of 1.0 p m 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 an individual aspect ratio of a longer diameter (1) to a thickness (d), [l/d], of 3.0 or more and 5.0 or less o 60 % or more. Currently amended
: The hexagonal boron nitride powder according to claim 1, wherein the hexagonal boron nitride powder comprises an aggregate of two or more primary particles, and when the hexagonal boron nitride powder is put through a sieve having an opening of 106 p m, the hexagonal boron nitride powder passing through the sieve has a 50 % volume cumulative particle size D so (1) of 25 p m or more and 100 p m or less, and a dispersion liquid obtained by dispersing in water the hexagonal boron nitride powder passing through the sieve has a 50 % volume cumulative particle size D 5 o(2) of 50 p m or less after the dispersion liquid is subjected to an ultrasonic treatment for 3 minutes. Previously presented
: The hexagonal boron nitride powder according to claim 1, having a BET specific surface area of 2.0 m 2/g or less. Previously presented
: A resin composition comprising: the hexagonal boron nitride powder according to claim 1; and an organic matrix, wherein the composition has a content of the hexagonal boron nitride powder of 10 % by volume or more and 90 % by volume or less based on a total amount of the hexagonal boron nitride powder and the organic matrix. Withdrawn
: A method for producing the hexagonal boron nitride powder according to claim 1, the method comprising the following steps 1 to 3: Step 1: a step of firing a boron carbide powder at 1600 ° C or more and 2200 ° C or less under a nitrogen gas atmosphere; Step 2: a step of heating a fired product obtained in the step 1 at 500 0 C or more and less than 1500 ° C under an oxygen-containing gas atmosphere, thereby decarbonizing the fired product; and Step 3: a step of firing again a product after decarbonization, the product obtained in the step 2, at 1500 0 C or more and 2200 ° C or less under a nitrogen gas atmosphere. Withdrawn
. Canceled
Embodiments described in the patent, grouped by the materials and process steps they use.
2 materials3 process steps
Boron carbide powder (100 g, D50=13 μm, purity 95% by mass) was fired at 2000°C under nitrogen gas atmosphere for 10 hours (Step 1). The fired product was heated at 900°C under air atmosphere for 10 hours to decarbonize (Step 2). Step 3 involved re-firing of the decarbonized product under nitrogen gas atmosphere with addition of a boron compound (25 parts by mass).
Materials described outside the worked examples.
organic matrix
boron compound
B₂O(3+x)H2x (x=0 to 3)
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
average longer diameter (L) of primary particles | 10–30 μm | hBN |
average thickness (D) of primary particles | ≥ 1 μm |
Patent
Atlas literature
Patent
US 11,577,957Patent drawings and their descriptions. Click a drawing to enlarge it.
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
: 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 p m and 30.0 p m or less; an average thickness (D) of the primary particles in the hexagonal boron nitride powder of 1.0 p m 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 an individual aspect ratio of a longer diameter (1) to a thickness (d), [l/d], of 3.0 or more and 5.0 or less o 60 % or more. Currently amended
: The hexagonal boron nitride powder according to claim 1, wherein the hexagonal boron nitride powder comprises an aggregate of two or more primary particles, and when the hexagonal boron nitride powder is put through a sieve having an opening of 106 p m, the hexagonal boron nitride powder passing through the sieve has a 50 % volume cumulative particle size D so (1) of 25 p m or more and 100 p m or less, and a dispersion liquid obtained by dispersing in water the hexagonal boron nitride powder passing through the sieve has a 50 % volume cumulative particle size D 5 o(2) of 50 p m or less after the dispersion liquid is subjected to an ultrasonic treatment for 3 minutes. Previously presented
: The hexagonal boron nitride powder according to claim 1, having a BET specific surface area of 2.0 m 2/g or less. Previously presented
: A resin composition comprising: the hexagonal boron nitride powder according to claim 1; and an organic matrix, wherein the composition has a content of the hexagonal boron nitride powder of 10 % by volume or more and 90 % by volume or less based on a total amount of the hexagonal boron nitride powder and the organic matrix. Withdrawn
: A method for producing the hexagonal boron nitride powder according to claim 1, the method comprising the following steps 1 to 3: Step 1: a step of firing a boron carbide powder at 1600 ° C or more and 2200 ° C or less under a nitrogen gas atmosphere; Step 2: a step of heating a fired product obtained in the step 1 at 500 0 C or more and less than 1500 ° C under an oxygen-containing gas atmosphere, thereby decarbonizing the fired product; and Step 3: a step of firing again a product after decarbonization, the product obtained in the step 2, at 1500 0 C or more and 2200 ° C or less under a nitrogen gas atmosphere. Withdrawn
. Canceled
Embodiments described in the patent, grouped by the materials and process steps they use.
2 materials3 process steps
Boron carbide powder (100 g, D50=13 μm, purity 95% by mass) was fired at 2000°C under nitrogen gas atmosphere for 10 hours (Step 1). The fired product was heated at 900°C under air atmosphere for 10 hours to decarbonize (Step 2). Step 3 involved re-firing of the decarbonized product under nitrogen gas atmosphere with addition of a boron compound (25 parts by mass).
Materials described outside the worked examples.
organic matrix
boron compound
B₂O(3+x)H2x (x=0 to 3)
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
average longer diameter (L) of primary particles | 10–30 μm | hBN |
average thickness (D) of primary particles | ≥ 1 μm |
Patent
Atlas literature
Patent
US 11,577,957Patent drawings and their descriptions. Click a drawing to enlarge it.
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
: 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 p m and 30.0 p m or less; an average thickness (D) of the primary particles in the hexagonal boron nitride powder of 1.0 p m 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 an individual aspect ratio of a longer diameter (1) to a thickness (d), [l/d], of 3.0 or more and 5.0 or less o 60 % or more. Currently amended
: The hexagonal boron nitride powder according to claim 1, wherein the hexagonal boron nitride powder comprises an aggregate of two or more primary particles, and when the hexagonal boron nitride powder is put through a sieve having an opening of 106 p m, the hexagonal boron nitride powder passing through the sieve has a 50 % volume cumulative particle size D so (1) of 25 p m or more and 100 p m or less, and a dispersion liquid obtained by dispersing in water the hexagonal boron nitride powder passing through the sieve has a 50 % volume cumulative particle size D 5 o(2) of 50 p m or less after the dispersion liquid is subjected to an ultrasonic treatment for 3 minutes. Previously presented
: The hexagonal boron nitride powder according to claim 1, having a BET specific surface area of 2.0 m 2/g or less. Previously presented
: A resin composition comprising: the hexagonal boron nitride powder according to claim 1; and an organic matrix, wherein the composition has a content of the hexagonal boron nitride powder of 10 % by volume or more and 90 % by volume or less based on a total amount of the hexagonal boron nitride powder and the organic matrix. Withdrawn
: A method for producing the hexagonal boron nitride powder according to claim 1, the method comprising the following steps 1 to 3: Step 1: a step of firing a boron carbide powder at 1600 ° C or more and 2200 ° C or less under a nitrogen gas atmosphere; Step 2: a step of heating a fired product obtained in the step 1 at 500 0 C or more and less than 1500 ° C under an oxygen-containing gas atmosphere, thereby decarbonizing the fired product; and Step 3: a step of firing again a product after decarbonization, the product obtained in the step 2, at 1500 0 C or more and 2200 ° C or less under a nitrogen gas atmosphere. Withdrawn
. Canceled
Embodiments described in the patent, grouped by the materials and process steps they use.
2 materials3 process steps
Boron carbide powder (100 g, D50=13 μm, purity 95% by mass) was fired at 2000°C under nitrogen gas atmosphere for 10 hours (Step 1). The fired product was heated at 900°C under air atmosphere for 10 hours to decarbonize (Step 2). Step 3 involved re-firing of the decarbonized product under nitrogen gas atmosphere with addition of a boron compound (25 parts by mass).
Materials described outside the worked examples.
organic matrix
boron compound
B₂O(3+x)H2x (x=0 to 3)
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
average longer diameter (L) of primary particles | 10–30 μm | hBN |
average thickness (D) of primary particles | ≥ 1 μm |
calcium compound
ratio of average longer diameter (L) to average thickness (D), [L/D] | 3–5 | hBN |
content of primary particles with individual aspect ratio [l/d] of 3.0 to 5.0 | ≥ 60 % | hBN |
50% volume cumulative particle size D50(1) of powder passing 106 μm sieve | 25–100 μm | hBN |
50% volume cumulative particle size D50(2) after 3 min ultrasonic treatment | ≤ 50 μm | hBN |
BET specific surface area | ≤ 2 m²/g | hBN |
Temperature | 1600–2200 °C | — |
Temperature | 1750–2200 °C | — |
Temperature | ≤ 1500 °C | — |
calcium compound
ratio of average longer diameter (L) to average thickness (D), [L/D] | 3–5 | hBN |
content of primary particles with individual aspect ratio [l/d] of 3.0 to 5.0 | ≥ 60 % | hBN |
50% volume cumulative particle size D50(1) of powder passing 106 μm sieve | 25–100 μm | hBN |
50% volume cumulative particle size D50(2) after 3 min ultrasonic treatment | ≤ 50 μm | hBN |
BET specific surface area | ≤ 2 m²/g | hBN |
Temperature | 1600–2200 °C | — |
Temperature | 1750–2200 °C | — |
Temperature | ≤ 1500 °C | — |
calcium compound
ratio of average longer diameter (L) to average thickness (D), [L/D] | 3–5 | hBN |
content of primary particles with individual aspect ratio [l/d] of 3.0 to 5.0 | ≥ 60 % | hBN |
50% volume cumulative particle size D50(1) of powder passing 106 μm sieve | 25–100 μm | hBN |
50% volume cumulative particle size D50(2) after 3 min ultrasonic treatment | ≤ 50 μm | hBN |
BET specific surface area | ≤ 2 m²/g | hBN |
Temperature | 1600–2200 °C | — |
Temperature | 1750–2200 °C | — |
Temperature | ≤ 1500 °C | — |
calcium compound
ratio of average longer diameter (L) to average thickness (D), [L/D] | 3–5 | hBN |
content of primary particles with individual aspect ratio [l/d] of 3.0 to 5.0 | ≥ 60 % | hBN |
50% volume cumulative particle size D50(1) of powder passing 106 μm sieve | 25–100 μm | hBN |
50% volume cumulative particle size D50(2) after 3 min ultrasonic treatment | ≤ 50 μm | hBN |
BET specific surface area | ≤ 2 m²/g | hBN |
Temperature | 1600–2200 °C | — |
Temperature | 1750–2200 °C | — |
Temperature | ≤ 1500 °C | — |