Functionalized elastomer
The present invention is directed to a stereoregular functionalized elastomer represented by poly(M1 co M2), wherein the functionalized elastomer comprises a microstructure selected from the group consisting of microstructures having at least 90 percent by weight of monomer residues in trans 1,4-configuration, and microstructures having at least 80 percent by weight of monomer residues in cis 1,4-configuration; wherein M1 is selected from the group consisting of isoprene and 1,3-butadiene; and M2 is of formula 4 wherein R 6 is a covalent bond, phenylene, a linear or branched alkane diyl group containing 1 to 10 carbon atoms, or a combination of one or more phenylene groups and one or more linear or branched alkane diyl groups containing 1 to 10 carbon atoms; R 7 is hydrogen or a linear or branched alkyl group containing 1 to 10 carbon atoms; X 1 is selected from formulas 5 and 6 wherein R 8 and R 9 are independently trialkylsilyl, phenyl or a linear or branched alkyl group containing 1 to 10 carbon atoms, or one of R 8 and R 9 is hydrogen and the other is phenyl or a linear or branched alkyl group containing 1 to 10 carbon atoms, or R 8 and R 9 taken together with the nitrogen atom represent a nitrogen containing heterocyclic group containing from 4 to 12 carbon atoms; and X 2 is a sulfur atom or a structure of formula 7 or 8 wherein when X 2 is of formula 8, the S atom of formula 8 is adjacent to the phenyl ring of formula 6 and the N atom of formula 8 is adjacent to R 6 .
1. A stereoregular functionalized elastomer represented by poly(M1 co M2), wherein the functionalized elastomer comprises a microstructure selected from the group consisting of microstructures having at least 90 percent by weight of monomer residues in trans 1,4-configuration, and microstructures having at least 80 percent by weight of monomer residues in cis 1,4-configuration; wherein M1 is selected from the group consisting of isoprene and 1,3-butadiene; and M2 is of formula 4
wherein R 6 is a covalent bond, phenylene, a linear or branched alkane diyl group containing 1 to 10 carbon atoms, or a combination of one or more phenylene groups and one or more linear or branched alkane diyl groups containing 1 to 10 carbon atoms; R 7 is hydrogen or a linear or branched alkyl group containing 1 to 10 carbon atoms; X 1 is selected from formulas 5 and 6
wherein R 8 and R 9 are independently phenyl or a linear or branched alkyl group containing 1 to 10 carbon atoms, or one of R 8 and R 9 is hydrogen and the other is phenyl or a linear or branched alkyl group containing 1 to 10 carbon atoms, or R 8 and R 9 taken together with the nitrogen atom represent a nitrogen containing heterocyclic group containing from 4 to 12 carbon atoms; and X 2 is a sulfur atom or a structure of formula 7 or 8
wherein when X 2 is of formula 8, the S atom of formula 8 is adjacent to the phenyl ring of formula 6 and the N atom of formula 8 is adjacent to R 6 ;
wherein the elastomer comprises a terminal end comprising a functional group selected from phosphane, phosphonic acid, phosphate, phosphodiester, phosphotriester, silyl, alkylsilyl, alkoxysilyl, and siloxy.
2. The stereoregular functionalized elastomer of claim 1 , wherein the functionalized elastomer comprises a microstructure selected from the group consisting of microstructures having at least 95 percent by weight of monomer residues in trans 1,4-configuration, and microstructures having at least 85 percent by weight of monomer residues in cis 1,4-configuration.
3. The stereoregular functionalized elastomer of claim 1 , wherein the elastomer comprises a one terminal end group of formula -R 1 -Q, where R 1 is phenylene, or a linear or branched alkane diyl group containing 2 to 10 carbon atoms, or a combination of one or more phenylene groups and one or more linear or branched alkane diyl groups containing 1 to 10 carbon atoms; Q is of formula 2 or 3
—S—R 2 2
where R 2 is phenyl, or a linear or branched alkyl group containing 2 to 10 carbon atoms; and
where R 3 and R 4 are independently phenyl or a linear or branched alkyl group containing 1 to 10 carbon atoms, or R 3 and R 4 taken together with the nitrogen atom represent a nitrogen containing heterocyclic group containing from 4 to 12 carbon atoms.
4. A rubber composition comprising the stereoregular functionalized elastomer of claim 1 .
5. A pneumatic tire comprising the rubber composition of claim 4 .