Silcone elastomer incorporating electrically conductive microballoons and method for producing same
AssigneeSpecialty Silicone Products, Inc.
InventorNed J. Reo
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Abstract
An electromagnetic interference shielding composition comprising a silicone elastomer having electrically conductive, magnetic, silver coated ceramic microballoons incorporated therein. The silicone elastomer is formed by combining a room temperature vulcanizing silicone rubber, a quantity of electrically conductive microballoons, and a heat cured silicone rubber.
Claims14
A method for making a silicone rubber composition moldable to an electromagnetic interference shielding material having substantially uniform electrical conductivity, which method comprises:
- blending (A) a heat curable silicone rubber composition comprising vinylmethylsiloxane, an effective amount of an inhibited platinum catalyst, and methylhydrogensiloxane, with (B) a slurry comprising (I) nonconductive microballoons surface coated with a magnetic electrically conductive material, and (II) a room temperature vulcanizable silicone rubber comprising, vinylmethylsiloxane, an effective amount of a platinum catalyst, and a methylhydrogensiloxane, where the microballoons of (B) have a specific gravity is in the range of 0.2 to 2.0 and are utilized in an amount sufficient to produce an electromagnetic interference shielding material having a specific gravity of less than 1.5.
A silicone composition which can be molded to an electromagnetic interference shielding material, comprising (B) a slurry comprising (I) nonconductive microballoons surface coated with a magnetic electrically conductive material, and (II) a room temperature vulcanizable silicone rubber comprising vinylmethylsiloxane, an effective amount of a platinum catalyst, and methylhydrogensiloxane and (A) a heat curable silicone rubber composition comprising vinylmethylsiloxane, an effective amount of an inhibited platinum catalyst, and methylhydrogensiloxane, where the specific gravity of the surface coated microballoons of (B) is in the range of 0.2 to 2.0 and the microballoons are utilized in an amount sufficient to produce an electromagnetic shielding material having a specific gravity of less than 1.5.
Electromagnetic interference shielding having a specific gravity of less than 1.5 and substantially uniform electrical conductivity, comprising a molded blend of (A) a heat curable silicone rubber composition, with (B) a slurry consisting essentially of (I) nonconductive microballoons surface coated with a magnetic electrically conductive material, and (ii) a room temperature vulcanizable silicone rubber comprising vinylmethylsiloxane, an effective amount of a platinum catalyst, and a methylhydrogensiloxane,
- where the microballoons of (B) have a specific gravity is in the range of 0.2 to 2.0.
Dependencies are inferred from the claim text.