JP2000007310A - Highly filling boron nitride powder - Google Patents
Highly filling boron nitride powderInfo
- Publication number
- JP2000007310A JP2000007310A JP10172576A JP17257698A JP2000007310A JP 2000007310 A JP2000007310 A JP 2000007310A JP 10172576 A JP10172576 A JP 10172576A JP 17257698 A JP17257698 A JP 17257698A JP 2000007310 A JP2000007310 A JP 2000007310A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- content
- boron nitride
- crystallization catalyst
- boron
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、樹脂やゴムへの充
填性に優れた六方晶窒化ホウ素粉末に関する。[0001] The present invention relates to a hexagonal boron nitride powder having an excellent filling property in resin and rubber.
【０００２】[0002]
【従来の技術】六方晶窒化ホウ素（ＢＮ）粉末は、白色
粉末で黒鉛と同じ六方晶系の層状構造を有し、高熱伝導
性、潤滑性、摺動性、耐食性、電気絶縁性、耐熱性、機
械加工の容易さなどに優れた特性を有することから様々
な用途に使用されている。2. Description of the Related Art Hexagonal boron nitride (BN) powder is a white powder having the same hexagonal layer structure as graphite, and has high thermal conductivity, lubricity, slidability, corrosion resistance, electrical insulation, and heat resistance. It is used in various applications because of its excellent properties such as ease of machining.
【０００３】電子材料分野においては、電子部品から発
生する熱を効率よく放出する放熱材料として、ＢＮ粉末
の配合された樹脂・ゴム組成物が使用されている。具体
的には、放熱性グリース、高柔軟性熱伝導性シリコンゴ
ム、熱伝導性絶縁放熱シート、更には電子回路基板や放
熱板のプレプリグ等である。[0003] In the field of electronic materials, a resin / rubber composition mixed with BN powder is used as a heat dissipation material for efficiently releasing heat generated from electronic components. Specifically, it is a heat-dissipating grease, a highly flexible heat-conductive silicone rubber, a heat-conductive insulating heat-dissipating sheet, a prepreg of an electronic circuit board or a heat-dissipating plate, or the like.
【０００４】電子材料分野以外では、耐熱性コーティン
グ材料、絶縁性ゴム材料、被覆材料、耐アーク性を有す
る材料、Ｂ系化合物を使用する中性子遮蔽材料、自動車
用潤滑グリースやオイル等である。[0004] Outside the field of electronic materials, there are heat-resistant coating materials, insulating rubber materials, coating materials, materials having arc resistance, neutron shielding materials using B-based compounds, lubricating greases and oils for automobiles, and the like.
【０００５】ところで、ＢＮ粉末の上記優れた特性を十
分に発揮させるには、樹脂・ゴムへの充填性を高める必
要があるが、ＢＮは鱗片状粒子であるので充填性が悪
い。そこで、従来より、樹脂成分の低粘度化や、溶剤や
カップリング剤によるＢＮ粉の前処理等が行われている
が、十分に満足できるものではなかった。By the way, in order to sufficiently exhibit the above-mentioned excellent properties of BN powder, it is necessary to enhance the filling property of resin and rubber. However, since BN is flaky particles, the filling property is poor. Therefore, conventionally, the viscosity of the resin component has been reduced, and the pretreatment of the BN powder with a solvent or a coupling agent has been performed, but it has not been sufficiently satisfactory.
【０００６】[0006]
【発明が解決しようとする課題】本発明は上記に鑑みな
されたものであり、樹脂やゴムに高充填が可能なＢＮ粉
末を提供することを目的とするものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above, and an object of the present invention is to provide a BN powder capable of highly filling a resin or rubber.
【０００７】[0007]
【課題を解決するための手段】本発明の目的は、ホウ素
源と、窒素源と、結晶化触媒（ｘＣａＯ・Ｂ２Ｏ３、但
しｘ＝１〜２）の前駆物質であるホウ酸カルシウム源と
を、焼成物中の結晶化触媒の割合が２５〜４５重量％と
なるように混合し、それを非酸化性雰囲気ガス下、温度
１９００〜２２００℃で焼成後、酸処理によって結晶化
触媒を除去し、温度１００〜１５０℃で乾燥して、ＢＮ
粉末を製造することによって達成することができる。An object of the present invention is to provide a boron source, a nitrogen source and a calcium borate source which is a precursor of a crystallization catalyst (xCaO.B2O3, where x = 1 to 2). The crystallization catalyst was mixed so that the ratio of the crystallization catalyst in the calcined product was 25 to 45% by weight, and calcined under a non-oxidizing atmosphere gas at a temperature of 1900 to 2200 ° C., and the crystallization catalyst was removed by acid treatment. Dried at a temperature of 100-150 ° C, BN
This can be achieved by producing a powder.
【０００８】すなわち、本発明は、タップ密度０．８ｇ
／ｃｍ3 以上、酸化ホウ素量２．０重量％以下、水分含
有量０．５重量％以下、５６μｍ以上の凝集粒子の含有
量１５重量％以下であることを特徴とする高充填性窒化
ホウ素粉末である。That is, according to the present invention, the tap density is 0.8 g.
/ Cm 3 or more, boron oxide content of 2.0% by weight or less, water content of 0.5% by weight or less, and content of aggregated particles having a size of 56 μm or more of 15% by weight or less. It is.
【０００９】[0009]
【発明の実施の形態】以下、本発明について更に詳細に
説明する。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail.
【００１０】本発明者は、樹脂・ゴムに対して高い充填
性を示すＢＮ粉末とするには、そのタップ密度を大きく
するとともに、ＢＮ粉末が含有する水分や酸化ホウ素が
樹脂・ゴム成分と反応して混合物の粘度が高くならない
ように、それらの含有量を調節すればよいことを見いだ
した。The inventor of the present invention has found that, in order to obtain BN powder having a high filling property with respect to resin and rubber, the tap density is increased and the moisture and boron oxide contained in the BN powder react with the resin and rubber components. It was found that their contents should be adjusted so that the viscosity of the mixture does not increase.
【００１１】また、従来より、タップ密度が高く、水分
量と酸化ホウ素量の低いＢＮとしてはその造粒物がある
が、造粒物であっても樹脂・ゴムへの充填性が十分に高
まったものとはならない。これは、樹脂・ゴムに高充填
できるＢＮ粉末は、造粒物のような５６μｍ以上の凝集
粒子の集合体では不十分であり、主として一次粒子によ
り構成されたＢＮ粉末が良いことを意味していること
を、併せて見いだしたものである。Conventionally, BN having a high tap density, a low water content and a low boron oxide content is a granulated product, but even a granulated product has a sufficiently high filling property to resin and rubber. It does not become a thing. This means that BN powder that can be highly filled into resin and rubber is not sufficient with an aggregate of aggregated particles of 56 μm or more, such as granules, and BN powder mainly composed of primary particles is good. Are also found.
【００１２】以上のことから、本発明においては、ＢＮ
粉末のタップ密度、水分量、酸化ホウ素量及び５６μｍ
以上の凝集粒子の割合を上記のように規制したものであ
り、これらが本発明の範囲を逸脱すると、樹脂・ゴムへ
の充填性を十分に改善することができなくなる。From the above, in the present invention, BN
Tap density, water content, boron oxide content and 56μm of powder
The ratio of the agglomerated particles is regulated as described above, and if the ratio deviates from the scope of the present invention, the filling property of the resin / rubber cannot be sufficiently improved.
【００１３】本発明のＢＮ粉末のタップ密度は、パウダ
ーテスターＰＴ−Ｅ型（ホソカワミクロン社）測定器を
用い、ＢＮ粉末を密度測定用１００ｃｍ3 容器に入れ、
タッピングリフト１８ｍｍにて１８０秒で１８０回のタ
ッピングさせ、衝撃で固めた後、容器上部の余分なＢＮ
粉をブレードで擦りきり、次式により求めたものであ
る。The tap density of the BN powder of the present invention is measured by using a powder tester PT-E type (Hosokawa Micron Corporation) measuring instrument, placing the BN powder in a 100 cm 3 container for density measurement,
After tapping 180 times in 180 seconds with a tapping lift of 18 mm and hardening by impact, extra BN on the top of the container
The powder was rubbed with a blade and determined by the following equation.
【００１４】タップ密度（ｇ／ｃｍ3 ）＝｛（ＢＮ粉末
重量＋容器風袋）−容器風袋｝／１００Tap density (g / cm 3 ) = {(weight of BN powder + container tare) −container tare} / 100
【００１５】また、本発明のＢＮ粉末中の水分量は、Ｂ
Ｎ粉末を石英製ボートに１．０ｇ精秤した後、シリカゲ
ル及び五酸化二りんを充填した乾燥塔を通した高純度窒
素ガス気流中、５００℃に加熱した石英製管状炉にて、
ＢＮ粉末中の水分を気化させ、排出される窒素中の水分
量をカールフィッシャー滴定法を用いたデジタル微量水
分計（三菱化学社「ＣＡ０５」、発生液；アクアミクロ
ンＡＸ（三菱化学社）、対極液；アクアミクロンＣＸＵ
（三菱化成社）を使用）で測定したものである。The amount of water in the BN powder of the present invention is B
After precisely weighing 1.0 g of N powder in a quartz boat, in a quartz tube furnace heated to 500 ° C. in a high-purity nitrogen gas flow through a drying tower filled with silica gel and diphosphorus pentoxide,
The moisture in the BN powder is vaporized, and the amount of moisture in the discharged nitrogen is measured using a Karl Fischer titration method. Liquid: Aquamicron CXU
(Using Mitsubishi Kasei Corporation).
【００１６】また、本発明のＢＮ粉末中の酸化ホウ素量
は、あらかじめ１２０℃にて２時間乾燥したＢＮ粉末５
ｇを平形秤量管に精秤し、メタノール（特級試薬）１５
ｍｌを加え、８０℃のホットプレート上に６０分静置し
た後、１２０℃の乾燥器にて１．５時間乾燥し、デシケ
ーター内で冷却した後秤量し、次式により求めたもので
ある。Further, the amount of boron oxide in the BN powder of the present invention is determined based on the BN powder 5 previously dried at 120 ° C. for 2 hours.
g is precisely weighed in a flat weighing tube, and methanol (special grade reagent) 15
The mixture was left standing on a hot plate at 80 ° C for 60 minutes, dried in a dryer at 120 ° C for 1.5 hours, cooled in a desiccator, weighed, and determined by the following equation.
【００１７】酸化ホウ素量（重量％）＝（ＢＮ粉末重量
−乾燥後重量）×１００／ＢＮ粉末重量Amount of boron oxide (% by weight) = (weight of BN powder−weight after drying) × 100 / weight of BN powder
【００１８】更に、本発明のＢＮ粉末中の５６μｍ以上
の凝集粒子の含有量は、１００ｍｌビーカーにヘキサメ
タリン酸ナトリウム（試薬１級）２０重量％水溶液１５
ｍｌを入れ、この水溶液にＢＮ粉末６０ｍｇを投入し、
超音波分散器で４０分間分散し、それをレーザー散乱式
粒度測定装置器「マイクロトラックＳＰＡ」のチェンバ
ー内に入れ、測定レンジ０．１〜６０μｍ、測定時間１
２０秒にて体積分布を測定し、測定された５６μｍ以上
の頻度値を求めたものである。Further, the content of aggregated particles having a size of 56 μm or more in the BN powder of the present invention is determined by adding a 20% by weight aqueous solution of sodium hexametaphosphate (first grade reagent) to a 100 ml beaker.
ml of BN powder and 60 mg of BN powder in this aqueous solution.
Disperse with an ultrasonic disperser for 40 minutes, put it in the chamber of the laser scattering type particle size analyzer "Microtrack SPA", measuring range 0.1-60 μm, measuring time 1
The volume distribution was measured at 20 seconds, and the measured frequency value of 56 μm or more was obtained.
【００１９】本発明のＢＮ粉末は、次のようにして製造
することができる。The BN powder of the present invention can be produced as follows.
【００２０】一般的に知られているＢＮ粉末の製造方法
は、炭素還元法、ホウ酸あるいは酸化ホウ素等のホウ素
源と、窒素源であるメラミン、ジシアンジアミドや尿素
などのアミン類あるいはアミノ基を有する化合物との塩
形成による製造法、更には前駆体を用いる製造法などで
ある。これらの製造法においては、ホウ素源と窒素源の
原料に、硼砂、リン酸カルシウム等の結晶化触媒を混合
し、非酸化性雰囲気ガス下、１５００℃以上の温度で焼
成・結晶化されているが、製造されたＢＮ粉末のタップ
密度は、いずれの製造方法においても低く、０．８ｇ／
ｃｍ3 を超えることはなかった。A generally known method for producing BN powder is a carbon reduction method, which has a boron source such as boric acid or boron oxide and an amine or an amino group such as melamine, dicyandiamide or urea as a nitrogen source. A production method by forming a salt with a compound, a production method using a precursor, and the like. In these production methods, a raw material of a boron source and a nitrogen source is mixed with a crystallization catalyst such as borax and calcium phosphate, and calcined and crystallized at a temperature of 1500 ° C. or more under a non-oxidizing atmosphere gas. The tap density of the manufactured BN powder was low in any of the manufacturing methods, and was 0.8 g /
It did not exceed cm 3 .
【００２１】これに対し、本発明の条件を満たすＢＮ粉
末の製造方法は、ホウ素源と、窒素源と、結晶化触媒
（ｘＣａＯ・Ｂ２Ｏ３、但しｘ＝１〜２）の前駆物質で
あるホウ酸カルシウム源とを、焼成物中の結晶化触媒の
割合が２５〜４５重量％となるように混合し、それを非
酸化性雰囲気ガス下、温度１９００〜２２００℃で焼成
後、酸処理によって結晶化触媒を除去し、温度１００〜
１５０℃で乾燥することによって製造することができ
る。ここで、非酸化性雰囲気ガスとしては、窒素ガスが
最適である。On the other hand, a method for producing a BN powder satisfying the conditions of the present invention is based on a boron source, a nitrogen source, and boric acid which is a precursor of a crystallization catalyst (xCaO.B2O3, where x = 1 to 2). A calcium source is mixed so that the ratio of the crystallization catalyst in the calcined product becomes 25 to 45% by weight, and calcined at a temperature of 1900 to 2200 ° C. under a non-oxidizing atmosphere gas, and then crystallized by an acid treatment. Remove the catalyst, temperature 100 ~
It can be produced by drying at 150 ° C. Here, nitrogen gas is optimal as the non-oxidizing atmosphere gas.
【００２２】本発明に係る製造方法は、従来法に比較し
て、ホウ酸とメラミンの塩を形成させることなく上記特
定条件で結晶化触媒を含む焼成物を製造し、それを酸処
理して結晶化触媒を除去した後、乾燥して水分調整を行
ったことが特徴である。In the production method according to the present invention, a calcined product containing a crystallization catalyst is produced under the above-mentioned specific conditions without forming a salt of boric acid and melamine, and is subjected to an acid treatment. After removal of the crystallization catalyst, drying is performed to adjust the water content.
【００２３】本発明に係る製造方法において、結晶化温
度が１９００℃未満であるか、又ははホウ酸とメラミン
の塩の生成を経由させて焼成物を製造すると、ＢＮ粉末
中の一次粒子の成長が十分でない部分が多くなり、得ら
れるＢＮ粉末のタップ密度が０．８ｇ／ｃｍ3 以上には
ならない。また、２２００℃をこえるとＢＮ粉末が分解
するために好ましくない。In the production method according to the present invention, if the crystallization temperature is lower than 1900 ° C. or if the calcined product is produced through the formation of a salt of boric acid and melamine, the growth of primary particles in the BN powder Are not sufficient, and the tap density of the obtained BN powder does not become 0.8 g / cm 3 or more. If the temperature exceeds 2200 ° C., the BN powder is decomposed, which is not preferable.
【００２４】また、結晶化触媒のｘ値が２をこえると、
得られるＢＮ粉末の一次粒子の成長が進行しにくくな
り、凝集粒子の割合が多くなる。一方、結晶化触媒のｘ
値が１未満では、結晶化触媒にはホウ酸カルシウムが存
在しないことになり、結晶の成長が起こりにくくなる。When the x value of the crystallization catalyst exceeds 2,
The growth of primary particles of the obtained BN powder becomes difficult to progress, and the ratio of aggregated particles increases. On the other hand, x of the crystallization catalyst
If the value is less than 1, calcium borate will not be present in the crystallization catalyst, and crystal growth will not easily occur.
【００２５】結晶化触媒量が２５重量％未満では、ＢＮ
粉末中の成長した一次粒子の割合が減少してタップ密度
が低くなる。逆に、４５重量％をこえても凝集粒子の割
合が多くなり、しかもＢＮ粉末の収率が悪く、また溶融
した結晶化触媒により炉材を破損させる恐れがある。When the amount of the crystallization catalyst is less than 25% by weight, BN
The percentage of grown primary particles in the powder is reduced and the tap density is reduced. Conversely, if it exceeds 45% by weight, the ratio of agglomerated particles increases, the yield of BN powder is poor, and the furnace material may be damaged by the molten crystallization catalyst.
【００２６】更には、酸処理を行わないと、ＢＮ粉末に
結晶化触媒が残存し、それが樹脂成分と反応するので好
ましくない。酸としては、硝酸等が使用される。Furthermore, if the acid treatment is not carried out, the crystallization catalyst remains in the BN powder, which reacts with the resin component, which is not preferable. Nitric acid or the like is used as the acid.
【００２７】酸処理後の乾燥温度が１００℃未満では含
有水分量が多くなり、また１５０℃をこえるとＢＮ粉末
中の酸化ホウ素量が増加し、所期の目的を達成すること
がでいない。If the drying temperature after the acid treatment is less than 100 ° C., the water content increases, and if it exceeds 150 ° C., the amount of boron oxide in the BN powder increases, and the intended purpose cannot be achieved.
【００２８】本発明のＢＮ粉末が配合される樹脂・ゴム
としては、エポキシ樹脂、シリコン樹脂、フェノール樹
脂、メラミン樹脂、ユリア樹脂、不飽和ポリエステル、
ジアリルフタレート樹脂、フッ素樹脂、ポリイミド、ポ
リアミド、ＡＢＳ樹脂、アクリロニトリル−エチレン・
プロピレン・ジエンゴム−スチレン樹脂等の樹脂、天然
ゴム、ブチルゴム、アクリルゴム、エチレンプロピレン
ゴム、シリコーンゴム、ポリエステルエラストマー、ポ
リブタジエン等のゴム、更にはグリース類等の油脂など
をあげることができる。The resins and rubbers to which the BN powder of the present invention is blended include epoxy resins, silicone resins, phenol resins, melamine resins, urea resins, unsaturated polyesters,
Diallyl phthalate resin, fluororesin, polyimide, polyamide, ABS resin, acrylonitrile-ethylene
Examples include resins such as propylene / diene rubber-styrene resin, natural rubber, butyl rubber, acrylic rubber, ethylene propylene rubber, silicone rubber, polyester elastomer, rubber such as polybutadiene, and oils and fats such as greases.
【００２９】[0029]
【実施例】以下、実施例、比較例をあげて更に具体的に
本発明を説明する。The present invention will be described more specifically with reference to examples and comparative examples.
【００３０】実施例１ オルトホウ酸５０重量部とメラミン４０重量部と炭酸カ
ルシウム１０重量部をヘンシェルミキサーで混合した。
これをバッチ雰囲気炉にて窒素雰囲気下、温度１９００
℃で焼成・結晶化した。得られた焼成物の結晶化触媒成
分を粉末Ｘ線回折法により調べたところ、ＣａＯ・Ｂ２
Ｏ３、と２ＣａＯ・Ｂ２Ｏ３が観測された。Example 1 50 parts by weight of orthoboric acid, 40 parts by weight of melamine and 10 parts by weight of calcium carbonate were mixed with a Henschel mixer.
This was placed in a batch atmosphere furnace under a nitrogen atmosphere at a temperature of 1900.
Fired and crystallized at ℃. When the crystallization catalyst component of the obtained calcined product was examined by powder X-ray diffraction, CaO.B2
O3 and 2CaO.B2O3 were observed.
【００３１】結晶化触媒を硝酸水溶液で除去し、次いで
１５０℃で乾燥した。その時の重量減少から算出された
結晶化触媒量は３５重量％であった。The crystallization catalyst was removed with an aqueous nitric acid solution and then dried at 150.degree. The amount of the crystallization catalyst calculated from the weight loss at that time was 35% by weight.
【００３２】得られたＢＮ粉末のタップ密度、水分量、
酸化ホウ素量及び５６μｍ以上の凝集粒子の割合を上記
に従い測定した。また、得られたＢＮ粉末の充填性を以
下に従い評価した。それらの結果を表２に示す。The tap density, the water content, and the
The amount of boron oxide and the ratio of aggregated particles of 56 μm or more were measured as described above. Further, the filling property of the obtained BN powder was evaluated as follows. Table 2 shows the results.
【００３３】充填性の評価：シリコーンオイル（トーレ
・シリコーン社「ＳＥ５００４」４５重量部とＢＮ粉末
５５重量部とを均一混合し、Ｂ型粘度計（東京計器社
「Ｎｏ．７ローター」）を用い、１０ｒｐｍで２分後の
粘度を室温で測定した。充填性が低いＢＮ粉末では粘度
が高くなり、逆に充填性が良好であれば粘度は低くな
る。Evaluation of Fillability: Silicone oil (45 parts by weight of SE5004, manufactured by Toray Silicone Co., Ltd.) and 55 parts by weight of BN powder were mixed uniformly, and a B-type viscometer (Tokyo Keiki Co., Ltd., “No. 7 rotor”) was used. The viscosity after 2 minutes at 10 rpm was measured at room temperature, and the BN powder with low filling property had a higher viscosity, and conversely the better filling property had a lower viscosity.
【００３４】実施例２〜４ 比較例１〜４ 表１に示す製造条件にしたこと以外は、実施例１に準じ
てＢＮ粉末を製造し、実施例１と同様な評価を行った。Examples 2 to 4 Comparative Examples 1 to 4 BN powder was produced in the same manner as in Example 1 except that the production conditions shown in Table 1 were used, and the same evaluation as in Example 1 was performed.
【００３５】比較例５ オルトホウ酸とメラミンと炭酸カルシウムをヘンシェル
ミキサーで混合した後、８５℃、相対湿度８５％雰囲気
下で５時間保持してホウ酸メラミン塩を形成させ、それ
を焼成・結晶化したこと以外は、実施例１と同様にして
ＢＮ粉末を製造し、評価を行った。Comparative Example 5 Orthoboric acid, melamine and calcium carbonate were mixed with a Henschel mixer, and the mixture was kept at 85 ° C. and 85% RH for 5 hours to form a melamine borate salt, which was then calcined and crystallized. A BN powder was manufactured and evaluated in the same manner as in Example 1 except that the evaluation was performed.
【００３６】[0036]
【表１】 [Table 1]
【００３７】[0037]
【表２】 [Table 2]
【００３８】本発明の実施例は、いずれもタップ密度が
０．８ｇ／ｃｍ3 以上と高く、水分量、酸化ホウ素量は
低い値を示している。また、充填性の指標となる粘度も
比較例に比べて小さいものであった。In all of the examples of the present invention, the tap density is as high as 0.8 g / cm 3 or more, and the water content and the boron oxide content are low. Further, the viscosity as an index of the filling property was smaller than that of the comparative example.
【００３９】[0039]
【本発明の効果】本発明によれば、樹脂・ゴムに高充填
可能なＢＮ粉末を提供することができる。According to the present invention, it is possible to provide a BN powder which can be highly filled in resin and rubber.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 川崎 卓 福岡県大牟田市新開町１ 電気化学工業株 式会社大牟田工場内 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Taku Kawasaki 1 Shinkaicho, Omuta City, Fukuoka Prefecture Inside the Omuta Plant of Denki Kagaku Kogyo Co., Ltd.
Claims (1)
ホウ素量２．０重量％以下、水分含有量０．５重量％以
下、５６μｍ以上の凝集粒子の含有量１５重量％以下で
あることを特徴とする高充填性窒化ホウ素粉末。1. A tap density of 0.8 g / cm 3 or more, a boron oxide content of 2.0% by weight or less, a water content of 0.5% by weight or less, and a content of aggregated particles of 56 μm or more of 15% by weight or less. A highly-filled boron nitride powder characterized by the following.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010047450A (en) * | 2008-08-22 | 2010-03-04 | Kaneka Corp | Hexagonal boron nitride and manufacturing method thereof |
| JP2010121102A (en) * | 2008-10-20 | 2010-06-03 | Kaneka Corp | Resin molded product with high light resistance and high thermal conductivity and lighting fixture component |
| JP2011184290A (en) * | 2010-02-09 | 2011-09-22 | Mitsubishi Materials Corp | Method for producing sintered cubic boron nitride compact |
| JP2012056818A (en) * | 2010-09-10 | 2012-03-22 | Denki Kagaku Kogyo Kk | Hexagonal boron nitride powder and high heat conductivity and high moisture resistance heat radiation sheet using the same |
| JP2017160086A (en) * | 2016-03-09 | 2017-09-14 | デンカ株式会社 | Hexagonal crystal boron nitride powder and manufacturing method therefor, and cosmetic |
| WO2018066277A1 (en) * | 2016-10-07 | 2018-04-12 | デンカ株式会社 | Boron nitride aggregated grain, method for producing same, and thermally conductive resin composition using same |
| JP2018108970A (en) * | 2017-01-05 | 2018-07-12 | デンカ株式会社 | Hexagonal boron nitride powder and cosmetics |
| CN109052343A (en) * | 2018-10-08 | 2018-12-21 | 河北工业大学 | A kind of preparation method of ultra-thin hexagonal boron nitride piece |
| CN115520841A (en) * | 2022-08-30 | 2022-12-27 | 山东工业陶瓷研究设计院有限公司 | Spherical boron nitride powder and in-situ synthesis preparation method thereof |
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| JPH09183660A (en) * | 1995-12-28 | 1997-07-15 | Denki Kagaku Kogyo Kk | High fillability hexagonal boron nitride powder, its production and use thereof |
| JPH1059702A (en) * | 1996-08-09 | 1998-03-03 | Otsuka Chem Co Ltd | Boron nitride and its production |
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1998
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09183660A (en) * | 1995-12-28 | 1997-07-15 | Denki Kagaku Kogyo Kk | High fillability hexagonal boron nitride powder, its production and use thereof |
| JPH1059702A (en) * | 1996-08-09 | 1998-03-03 | Otsuka Chem Co Ltd | Boron nitride and its production |
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|---|---|---|---|---|
| JP2010047450A (en) * | 2008-08-22 | 2010-03-04 | Kaneka Corp | Hexagonal boron nitride and manufacturing method thereof |
| JP2010121102A (en) * | 2008-10-20 | 2010-06-03 | Kaneka Corp | Resin molded product with high light resistance and high thermal conductivity and lighting fixture component |
| JP2011184290A (en) * | 2010-02-09 | 2011-09-22 | Mitsubishi Materials Corp | Method for producing sintered cubic boron nitride compact |
| EP2354110A3 (en) * | 2010-02-09 | 2012-11-28 | Mitsubishi Materials Corporation | Method for producing sintered cubic boron nitride compact |
| US8657893B2 (en) | 2010-02-09 | 2014-02-25 | Mitsubishi Materials Corporation | Method for producing sintered cubic boron nitride compact |
| JP2012056818A (en) * | 2010-09-10 | 2012-03-22 | Denki Kagaku Kogyo Kk | Hexagonal boron nitride powder and high heat conductivity and high moisture resistance heat radiation sheet using the same |
| JP2017160086A (en) * | 2016-03-09 | 2017-09-14 | デンカ株式会社 | Hexagonal crystal boron nitride powder and manufacturing method therefor, and cosmetic |
| WO2018066277A1 (en) * | 2016-10-07 | 2018-04-12 | デンカ株式会社 | Boron nitride aggregated grain, method for producing same, and thermally conductive resin composition using same |
| US11268004B2 (en) | 2016-10-07 | 2022-03-08 | Denka Company Limited | Boron nitride aggregated grain |
| US11732173B2 (en) | 2016-10-07 | 2023-08-22 | Denka Company Limited | Surface-treated aggregated boron nitride powder, aggregated boron nitride powder, and thermally conductive resin composition |
| JP2018108970A (en) * | 2017-01-05 | 2018-07-12 | デンカ株式会社 | Hexagonal boron nitride powder and cosmetics |
| JP7002196B2 (en) | 2017-01-05 | 2022-01-20 | デンカ株式会社 | Hexagonal boron nitride powder and cosmetics |
| CN109052343A (en) * | 2018-10-08 | 2018-12-21 | 河北工业大学 | A kind of preparation method of ultra-thin hexagonal boron nitride piece |
| CN115520841A (en) * | 2022-08-30 | 2022-12-27 | 山东工业陶瓷研究设计院有限公司 | Spherical boron nitride powder and in-situ synthesis preparation method thereof |
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