Nikaido, Marmelstein, Murray & Oram
Silicone rubber roller for electrophotography and method of producing the same
 There is disclosed an electrically conductive rubber roller for electrophotography which changes very little in electric resistance with changes in environment. This roller is used for charging and image transferring processes in copying machines and laser beam printers. The roller comprises a porous body of crosslinking silicone composition, containing at least a silica type filler, carbon black a foaming agent and siloxane polymer; the composition has an electric resistance of 10.sup.3 -10.sup.8. 
Sumitomo Rubber Industries, Ltd.
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Hitoshi Hirotoshi Yuji
Itani Murakami Yamasaki