FUNCTIONALIZED HYDROGENATED POLYMERS
A hydrogenated functionalized polymer obtained by selectively hydrogenating functionalized elastomer double bonds to a predetermined level of saturation, wherein the functionalized elastomer is a reaction product of a living elastomeric polymer and a polymerization terminator of formula I wherein R 1 is C1 to C4 linear alkyl, or C1 to C4 branched alkanediyl; X 1 , X 2 , X 3 are independently O, S, or a group of formula (II) or (III) where R 2 is C1 to C18 linear or branched alkyl; Z is —R 3 —X 4 ; R 3 is C1 to C18 alkanediyl or dialkyl ether diyl; X 4 is a group that is able to react with a pseudo-living chain end.
1 . A hydrogenated functionalized polymer obtained by selectively hydrogenating functionalized elastomer double bonds to a predetermined level of saturation, wherein the functionalized elastomer is a reaction product of a living elastomeric polymer and a polymerization terminator of formula I, wherein the functionalized elastomer comprises repeat units of a diene monomer and optionally a vinyl aromatic monomer, and the functionalized elastomer comprises at least 92 percent by weight of cis 1,4 microstructure content based on the weight of the polydiene content of the functionalized elastomer
wherein R 1 is C1 to C4 linear alkyl, or C1 to C4 branched alkanediyl; X 1 , X 2 , X 3 are independently O, S, or a group of formula (II) or (III)
where R 2 is C1 to C18 linear or branched alkyl; Z is —R 3 —X 4 ; R 3 is C1 to C18 alkanediyl or dialkyl ether diyl; X 4 is a group of structure IV or V
wherein R 6 , R 7 , and R 8 are independently H or C1 to C8 alkyl; R 12 and R 13 are independently H, aryl or C1 to C8 alkyl;
Q is N or a group of structure IX
wherein R 14 is C1 to C8 alkyl.
2 . The hydrogenated functionalized polymer of claim 1 , wherein the living elastomer is derived from at least one of isoprene and butadiene.
3 . The hydrogenated functionalized polymer of claim 1 , wherein the living elastomer is derived from butadiene.
4 . The hydrogenated functionalized polymer of claim 1 , wherein the polymerization terminator of formula I is selected from the group consisting of the following structures
EPTI: 3,7,10-trimethyl-1-(3-(oxiran-2-ylmethoxy)propyl)-2,8,9-trioxa-5-aza-1-silabicyclo[3.3.3]undecane; or 1-(3-(oxiran-2-ylmethoxy)propyl)-3,7,10-trimethylsilatrane.
5 . The hydrogenated functionalized polymer of claim 1 , wherein the functionalized elastomer comprises at least 95 percent by weight of cis 1,4 microstructure content based on the weight of the polydiene content of the functionalized elastomer.
6 . The hydrogenated functionalized polymer of claim 1 , wherein the functionalized elastomer comprises at least 98 percent by weight of cis 1,4 microstructure content based on the weight of the polydiene content of the functionalized elastomer.
7 . A rubber composition comprising the hydrogenated functionalized polymer of claim 1 .
8 . The rubber composition of claim 7 , further comprising silica.
9 . A pneumatic tire comprising the rubber composition of claim 8 .
10 . The hydrogenated functionalized polymer of claim 1 , wherein the living elastomeric polymer is polymerized in the presence of a lathanide-based coordination polymerization catalyst.
11 . The hydrogenated functionalized polymer of claim 1 , wherein the lanthanide-based coordination polymerization catalyst is a neodymium based catalyst.
12 . The hydrogenated functionalized polymer of claim 1 , wherein the functionalized elastomer has a degree of hydrogenation of double bonds from about 10 percent to about 40 percent.
13 . The hydrogenated functionalized polymer of claim 1 , wherein the functionalized elastomer has a degree of hydrogenation of double bonds from about 40 percent to about 80 percent.
14 . The hydrogenated functionalized polymer of claim 1 , wherein the functionalized elastomer has a degree of hydrogenation of double bonds from about 80 percent to about 100 percent.
15 . The hydrogenated functionalized polymer of claim 1 , wherein the functionalized elastomer is fully saturated.