Electrically insulating powdery material, a process for its pre

Details Electrically insulating powdery material, a process for its pre Electrically insulating powdery material, a process for its pre

1974-08-12

1976-03-30

Welsh, John D.

Compositions

Electrolytes for electrical devices

252 635, 260 37M, 106288B, 106286, 174110A, 174110SR, H01B 300, C08L 500, H01B 700

Patent

active

039473732

ABSTRACT:
An electrically insulating powdery material with a volume resistivity of at least 1 .times. 10.sup.10 ohms-cm, which consists of a calcined product of a mixture of magnesium oxide with boron oxide and if desired, at least one of titanium, iron and chromium oxides and has a special novel structure wherein a core of magnesium oxide particles is surrounded by a sheath of a double oxide of the magnesium oxide and the boron oxide and if desired, the other metal oxide. This insulating powdery material is produced by calcining the above mixture under specified calcining conditions determined by a special temperature-time relation. A thermally conducting and electrically insulating resin composition especially having superior electrical properties under high temperature-high humidity conditions can be prepared using the above powdery material as a filler.

REFERENCES:
patent: 2280517 (1942-04-01), Ridgway
patent: 2622537 (1971-11-01), Needham

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