Method for producing modified conjugated diene polymer and rubber composition

Abstract

A rubber composition containing a modified conjugated diene polymer.

1 . A rubber composition comprising a rubber component comprising 20 to 100% by weight of a modified conjugated diene polymer, 
 wherein the modified conjugated diene polymer is produced by a process comprising    modifying an active end of an active end-comprising conjugated diene polymer having a cis-1,4-bond content of 75% or more with an alkoxysilane compound comprising at least one functional group selected from the group consisting of (a) an epoxy group, (b) an isocyanate group and (c) a carboxyl group, and    adding a condensation accelerator to conduct condensation reaction of the alsoxysilane compound (residue) in an aqueous solution having a pH of 9 to 14 and a temperature of 85 to 180° C.;    and 80 to 0% by weight of at least one different rubber selected from the group consisting of a natural rubber, a synthetic isoprene rubber, a butadiene rubber, a styrene-butadiene rubber, an ethylene-α-olefin copolymer rubber, an ethylene-α-olefin-diene copolymer rubber, an acrylo-nitrile-butadiene copolymer rubber, a chloroprene rubber and a halogenated butyl rubber (with the proviso that (the amount of the modified conjugated diene polymer)+(the amount of the different rubber(s))=100% by weight),    wherein carbon black and/or silica are incorporated in an amount of 20 to 120 parts by weight based on 100 parts by weight of the rubber component.    
     
     
         2 . A rubber composition comprising a rubber component comprising 20 to 100% by weight of the modified conjugated diene polymer, 
 wherein the modified conjugated diene polymer is produced by a process comprising    modifying an active end of an active end-comprising conjugated diene polymer having a cis-1,4-bond content of 75% or more with an alkoxysilane compound comprising at least one functional group selected from the group consisting of (a) an epoxy group, (b) an isocyanate group and (c) a carboxyl group, and    adding a condensation accelerator to conduct condensation reaction of the alsoxysilane compound (residue) in an aqueous solution having a pH of 9 to 14 and a temperature of 85 to 180° C.,    wherein the process further comprises adding a compound comprising at least one functional group selected from the group consisting of (d) an amino group, (e) an imino group and (f) a mercapto group, and    wherein the condensation accelerator is at least one material selected from the group consisting of (j) a carboxylate of divalent tin and (k) a tetravalent tin compound comprising a hydroxyl group or a carboxyl group; and    80 to 0% by weight of at least one different rubber selected from the group consisting of a natural rubber, a synthetic isoprene rubber, a butadiene rubber, a styrene-butadiene rubber, an ethylene-α-olefin copolymer rubber, an ethylene-α-olefin-diene copolymer rubber, an acrylo-nitrile-butadiene copolymer rubber, a chloroprene rubber and a halogenated butyl rubber (with the proviso that (the amount of the modified conjugated diene polymer)+(the amount of the different rubber(s))=100% by weight),    wherein carbon black and/or silica are incorporated in an amount of 20 to 120 parts by weight based on 100 parts by weight of the rubber component.    
     
     
         3 . A rubber composition comprising a rubber component comprising 20 to 100% by weight of a modified conjugated diene polymer, 
 wherein the modified conjugated diene polymer is produced by a process comprising    modifying an active end of an active end-comprising conjugated diene polymer having a cis-1,4-bond content of 75% or more with an alkoxysilane compound comprising at least one functional group selected from the group consisting of (a) an epoxy group, (b) an isocyanate group and (c) a carboxyl group, and    adding a condensation accelerator to conduct condensation reaction of the alsoxysilane compound (residue) in an aqueous solution having a pH of 9 to 14 and a temperature of 85 to 180° C.,    wherein the alkoxysilane compound is at least one silane compound selected from the group consisting of    3-diethylaminopropyl(triethoxy)silane,    3-dimethylaminopropyl(triethoxy)silane,    3-aminopropyltriethoxysilane,    3-(1-hexamethyleneimino)propyl(triethoxy)silane,    N-(1-methylpropylidene)-3-(triethoxysilyl)-1-propaneamine,    N-(1,3-dimethylbutylidene)-3-(triethoxysilyl)-1-propaneamine,    3-(1-hexamethyleneimino)propyl(triethoxy)silane,    (1-hexamethyleneimino)methyl(trimethoxy)silane,    1-[3-(triethoxysilyl)propyl]-4,5-dihydroimidazole,    1-[3-(trimethoxysilyl)propyl]-4,5-dihydroimidazole,    N-(3-triethoxysilylpropyl)-4,5-dihydroimidazole and 3-mercaptopropyltriethoxysilane, and    wherein the process further comprises adding a compound comprising at least one functional group selected from the group consisting of (d) an amino group, (e) an imino group and (f) a mercapto group; 
 and 80 to 0% by weight of at least one different rubber selected from the group consisting of a natural rubber, a synthetic isoprene rubber, a butadiene rubber, a styrene-butadiene rubber, an ethylene-α-olefin copolymer rubber, an ethylene-α-olefin-diene copolymer rubber, an acrylo-nitrile-butadiene copolymer rubber, a chloroprene rubber and a halogenated butyl rubber (with the proviso that (the amount of the modified conjugated diene polymer)+(the amount of the different rubber(s))=100% by weight),  
 wherein carbon black and/or silica are incorporated in an amount of 20 to 120 parts by weight based on 100 parts by weight of the rubber component.  
   
     
     
         4 . A rubber composition comprising a rubber component comprising 20 to 100% by weight of a modified conjugated diene polymer, 
 wherein the modified conjugated diene polymer is produced by a process comprising    modifying an active end of an active end-comprising conjugated diene polymer having a cis-1,4-bond content of 75% or more with an alkoxysilane compound comprising at least one functional group selected from the group consisting of (a) an epoxy group, (b) an isocyanate group and (c) a carboxyl group, and    adding a condensation accelerator to conduct condensation reaction of the alsoxysilane compound (residue) in an aqueous solution having a pH of 9 to 14 and a temperature of 85 to 180° C.,    wherein the condensation accelerator is at least one material selected from the group consisting of (j) a carboxylate of divalent tin and (k) a tetravalent tin compound comprising a hydroxyl group or a carboxyl group;    and 80 to 0% by weight of at least one different rubber selected from the group consisting of a natural rubber, a synthetic isoprene rubber, a butadiene rubber, a styrene-butadiene rubber, an ethylene-α-olefin copolymer rubber, an ethylene-α-olefin-diene copolymer rubber, an acrylo-nitrile-butadiene copolymer rubber, a chloroprene rubber and a halogenated butyl rubber (with the proviso that (the amount of the modified conjugated diene polymer)+(the amount of the different rubber(s))=100% by weight), wherein carbon black and/or silica are incorporated in an amount of 20 to 120 parts by weight based on 100 parts by weight of the rubber component.    
     
     
         5 . The rubber composition according to  claim 4 , wherein the condensation accelerator is tin bis(n-octanoate), tin bis(2-ethylhexanoate), tin bis(laurate), tin bis(naphthoate), tin bis(stearate), tin bis(oleate), dibutyltin diacetate, dibutyltin di-n-octanoate, dibutyltin 2-ethylhexanoate, dibutyltin dilaurate, dibutyltin maleate, dibutyltin bis(benzylmaleate), dibutyltin bis(2-ethylhexylmaleate), di-n-octyltin diacetate, di-n-octyltin di-n-octanoate, di-n-octyltin di-2-ethylhexanoate, di-n-octyltin dilaurate, di-n-octyltin maleate, di-n-octyltin bis(benzylmaleate) or di-n-octyltin bis(2-ethylhexylmaleate).