Patent ID: 8715533

Claim:
A dielectric raw material comprising: a silicone rubber base material containing a silicone rubber as a main material; and carbon dispersed in the silicone rubber base material, wherein the carbon is unevenly distributed in the silicone rubber base material or the carbon is contained with at least part of carbon materials contacting each other, so that conductive paths cover an area of not less than ¼ times of the surface area of the dielectric raw material, in a dielectric raw material containing 150 to 300 parts by weight of said carbon per 100 parts by weight of said silicone rubber, wherein the dielectric raw material is formed by crosslinking and molding a mixture of said silicone rubber in its non-crosslinked state, a non-crosslinked organic polymer, and said carbon, and the amount of the non-crosslinked organic polymer is 1 to 15 parts by weight per 100 parts by weight of the non-crosslinked silicone rubber, and combining and blending at least two kinds of said carbon having different shapes, wherein said organic polymer is liquid ethylenepropylene rubber or polybutene, and wherein the at least two kinds of said carbon are selected from the group consisting of spherical carbon, carbon nanotubes, and conductive carbon.