Polymer composition for conductive roller, polymer composition, conductive roller, and conductive belt

Abstract

A polymer composition for a conductive roller composed of a rubber component whose main component is an epichlorohidrin rubber containing ethylene oxide at not less than 55 mol % nor more than 95 mol %. Thioureas are added to 100 g of the rubber component as a crosslinking agent at a rate not less than 0.014 mol nor more than 0.080 mol. In a compression set test of a vulcanized rubber described in JIS K6262, a compression set measured at 70° C. for 22-24 hours is less than 15%; and in a volume resistivity value test described in JIS K6911, a volume resistivity value measured at an applied voltage of 1000V is less than 10 7.5 [Ω·cm].

1 - 20 . (Cancelled)  
     
     
         21 . A polymer composition for a conductive roller containing a polymer having carbon-to-carbon double bonds and a halogen as a main component thereof and containing a chemical foaming agent, sulfur, and thioureas.  
     
     
         22 . The polymer composition according to  claim 21 , wherein as said polymer having carbon-to-carbon double bonds and said halogen, epichlorohidrin-ethylene oxide-allyl glycidyl ether copolymer and/or a chloroprene rubber are used; and 
 as said thioureas, one or a plurality of thioureas selected from among a group consisting of tetramethylthiourea, trimethylthiourea, ethylene thiourea, and (C n H 2n+1 NH) 2 C═S (n=integers 1-10) is used.    
     
     
         23 . The polymer composition for a conductive roller according to  claim 21 , wherein said chemical foaming agent is a hydrazine derivative.  
     
     
         24 . The polymer composition for a conductive roller according to  claim 23 , wherein said hydrazine derivative is 4,4′-oxybis (benzene sulfonyl hydrazide).  
     
     
         25 . The polymer composition for a conductive roller according to  claim 21 , wherein said thioureas are added to 100 g of an entire polymer component at a rate not less than 0.0009 mol nor more than 0.0800 mol; and 
 said sulfur is added to 100 parts by weight of said entire polymer component at a rate not less than 0.1 parts by weight nor more than 5.0 parts by weight; and said chemical foaming agent is added to 100 parts by weight of said entire polymer component at a rate not less than 0.5 parts by weight nor more than 20 parts by weight.    
     
     
         26 - 33  (Cancelled)