Semi-conductive silicone rubber composition
AssigneeTigers Polymer Corporation
InventorsWataru Matsumoto, Tetsuya Nakamura, Koji Sawada
Life of this patent
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Abstract
A semi-conductive silicone rubber composition contains carbon black. The carbon black contains thermal black obtained by thermally cracking a natural gas and having a specific surface area—nitrogen absorption method of 8.0 to 10.0 m2/g, a dibutyl phthalate absorption number (dibutyl phthalate absorption number) of 30 to 40 cm3/100 g and an averaged particle size of 200 to 330 nm.
Claims4
A semi-conductive silicone rubber composition containing carbon black, wherein said carbon black includes thermal black obtained by thermally cracking a natural gas and having a specific surface area (nitrogen absorption method) of 8.5 to 10.0 m2/g, a dibutyl phthalate absorption number of 30 to 40 cm3/100 g and an average particle size of 200 to 330 nm, said silicone rubber composition having a substantially stable resistance value despite slight variations in blending amount of said thermal black.
A rubber roll comprising:
- a conductive core member;
- and
- a silicone rubber layer coated on an outer peripheral surface of said conductive core member, said silicone rubber layer comprising a semi-conductive silicone rubber composition containing carbon black, said carbon black including thermal black obtained by thermally cracking a natural gas and having a specific surface area (nitrogen absorption method) of 8.5 to 10.0 m2/g, a dibutyl phthalate absorption number of 30 to 40 cm3/100 g and an average particle size of 200 to 330 nm, said silicone rubber composition having a substantially stable resistance value despite slight variations in blending amount of said thermal black.
Dependencies are inferred from the claim text.