Heat-curable silicone rubber composition

Abstract

The present invention provides a heat-curable silicone rubber composition having antistatic properties, even after secondary vulcanization at high temperatures. Specifically disclosed is a heat-curable silicone rubber composition which is obtained by adding 0.05 to 1000 ppm of (B) a poorly water-soluble or water-insoluble ionic substance whose anionic component is bis(trifluoromethanesulfonyl)imide, to 100 parts by weight of (A) a heat-curable silicone rubber.

What is claimed is: 
     
         1 . A heat-curable silicone rubber composition, prepared by adding 10 to 100 ppm of (B) a poorly water-soluble or water-insoluble ionic liquid having bis(trifluoromethanesulfonyl)imide as an anionic component, is in the liquid state at an ordinary temperature of 23° C. and has a decomposition temperature of at least 220° C. to 100 parts by weight of (A) a heat-curable silicone rubber. 
     
     
         2 . The heat-curable silicone rubber composition according to  claim 1 , wherein the component (B) is selected from the group consisting of N-butyl-3-methylpyridinium•bis(trifluoromethane-sulfonyl)imide 1-butyl-1-methylpyrrolidinium•bis(trifluoro-methanesulfonyl)imide and diallyldimethylammonium•bis(trifluoro-methanesulfonyl)imide. 
     
     
         3 . The heat curable silicone rubber composition according to  claim 1 , additionally comprising a cationic component. 
     
     
         4 . A heat-curable silicone rubber composition, prepared by adding 0.05 to 10 ppm of (B) a poorly water-soluble or water-insoluble ionic liquid having bis(trifluoromethanesulfonyl)imide as an anionic component, is in the liquid state at an ordinary temperature of 23° C. and has a decomposition temperature of at least 220° C. to 100 parts by weight of (A) a heat-curable silicone rubber. 
     
     
         5 . The heat curable silicone rubber composition according to  claim 4 , wherein the component (B) is N-butyl-3-methyl-pyridinium•bis(trifluoromethanesulfonyl)imide. 
     
     
         6 . The heat curable silicone rubber composition according to  claim 4 , wherein the component (B) is 1-butyl-1-methyl-pyrrolidinium•bis(trifluoromethanesulfonyl)imide. 
     
     
         7 . The heat curable silicone rubber composition according to  claim 4 , wherein the component (B) is diallyldimethyl-ammonium•bis(trifluoromethanesulfonyl)imide. 
     
     
         8 . The heat-curable silicone rubber composition according to  claim 4 , wherein the ionic liquid as the component (B) has at least one alkenyl group as a cationic ion. 
     
     
         9 . The heat-curable silicone rubber composition according to  claim 4 , wherein the component (B) is selected from the group consisting of N-butyl-3-methylpyridinium•bis(trifluoromethane-sulfonyl)imide 1-butyl-1-methylpyrrolidinium•bis(trifluoro-methanesulfonyl)imide and diallyldimethylammonium•bis(trifluoro-methanesulfonyl)imide. 
     
     
         10 . The heat-curable silicone rubber composition according to  claim 4 , further comprising (C) a perfluoroalkyl group-containing polyorganosiloxane, which is added in amounts of 0.001 to 10 parts by weight relative to 100 parts by weight of the component (A). 
     
     
         11 . A transparent silicone rubber obtained from the heat-curable silicone rubber composition according to  claim 4 . 
     
     
         12 . The heat-curable silicone rubber composition according to  claim 4 , wherein the component (B) is selected from the group consisting of 1-butyl-3-methylimidazolium•bis (trifluoromethane-sulfonyl)imide, 1,2-dimethyl-3-propylimidazolium•bis(trifluoro-methanesulfonyl)imide, 1-ethyl-3-methylimidazolium•bis(trifluoro-methanesulfonyl)imide, 3-methyl-1-propylpyridinium•bis(trifluoro-methanesulfonyl)imide, N-butyl-3-methylpyridinium•bis(trifluoro-methanesulfonyl)imide, 1-butyl-1-methylpyrrolidinium•bis(tri-fluoromethanesulfonyl)imide, 1-vinylimidazolium•bis(trifluoro-methanesulfonyl)imide, 1-allylimidazolium•bis(trifluoromethane-sulfonyl)imide, 1-allyl-3-methylimidazolium•bis(trifluoromethane-sulfonyl)imide and diallyldimethylammonium•bis(trifluoromethane-sulfonyl)imide.