Composition for substrate materials and process for the same as well as a heat conductive substrate and process for the same

A process for manufacturing a composition for substrate materials, wherein 70-95 wt. % of inorganic powder and 5-30 wt. % of thermosetting resin composition including thermosetting resin which is in a solid condition at a room temperature are crushed into fine pieces and mixed.

A process for manufacturing a composition for substrate materials, comprising the steps of:

• 70-95 wt. % of inorganic powder and 5-30 wt. % of thermosetting resin composition including a thermosetting resin which is in a liquid condition at a room temperature are mixed;
• and
• a mixture prepared at the foregoing step is granulated and crushed into fine pieces.

A heat conductive substrate having an insulator body formed by heating and pressurizing a composition for substrate materials including 70-95 wt. % of inorganic powder having electric insulation and 5-30 wt. % of thermosetting resin composition and being in a finely crushed condition.

A process for manufacturing a heat conductive substrate comprising:

• the first step that a composition for substrate materials including 70-95 wt. % of inorganic powder having electric insulation and 5-30 wt. % of thermosetting resin composition and being in a finely crushed condition is cast into a metal mold;
• and
• the second step that said composition for substrate materials is formed into a insulator body by heating and pressurizing said composition for substrate materials within said metal mold so that said thermosetting resin is cured.