| 摘要 |
PURPOSE:To carry out the synthesis of the titled product easily in an extremely high conversion, by contacting a raw material containing at least boron nitride or a raw material containing a catalytic substance and a specific metal or their compounds with borazine, etc. CONSTITUTION:The starting raw material of the present process is selected from (1) boron nitride, (2) a composition containing boron nitride, a catalytic substance and one or more substances selected from a metal of the group IVa, Va or VIa of the periodic table, Si, Al, iron-group metal or their compound, (3) a composition containing a catalytic substance and one or more substances selected from a metal of the group IVa, Va or VIa, Si, Al, iron-group metal or their compound, (4) a composition containing various metals, various metal compounds, carbonaceous substances, etc., in addition to the raw material 3, and (5) a composition containing the raw materials 3 and the raw material 4. The starting raw material is made to contact with borazine, a borazine derivative and/or a compound of B, H and N and capable of forming boron nitride by releasing H by thermal decomposition under pressure, and is treated under a temperature and pressure condition to enable the stable maintenance of cubic boron nitride. The obtained cubic boron nitride is separated from the reaction product.
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