Functionalized polymer, rubber composition and pneumatic tire
The present invention is directed to a functionalized elastomer comprising the reaction product of a living anionic elastomeric polymer and a polymerization terminator of formula I wherein R 1 is C1 to C4 linear or branched alkanediyl; Z is R 2 , —OR 3 , or —R 4 —X; R 2 , R 3 are independently C1 to C18 linear or branched alkyl; R 4 is C1 to C18 alkanediyl; X is halogen or a group of structure II, III, IV, V or VI wherein R 5 , R 6 , R 7 , R 8 , and R 9 are independently H or C1 to C8 alkyl; R 10 is C2 to C8 alkanediyl; R 11 and R 12 are independently H, aryl or C1 to C8 alkyl; Q is N or a group of structure VII wherein R 13 is C1 to C8 alkyl.
1. A functionalized elastomer comprising the reaction product of a living anionic elastomeric polymer and a polymerization terminator of formula I
wherein R 1 is C1 to C4 linear or branched alkanediyl;
Z is R 2 , —OR 3 , or —R 4 —X; R 2 , R 3 are independently C1 to C18 linear or branched alkyl; R 4 is C1 to C18 alkanediyl;
X is a group of structure II, III, IV, V or VI
wherein R 5 , R 6 , R 7 , R 8 , and R 9 are independently H or C1 to C8 alkyl; R 10 is C2 to C8 alkanediyl;
R 11 and R 12 are independently H, aryl or C1 to C8 alkyl;
Q is N or a group of structure VII
wherein R 13 is C1 to C8 alkyl.
2. The functionalized elastomer of claim 1 , wherein the living anionic elastomer is derived from at least one diene monomer and optionally at least one vinyl aromatic monomer.
3. The functionalized elastomer of claim 1 , wherein the living anionic elastomer is derived from at least one of isoprene and butadiene, and optionally from styrene.
4. The functionalized elastomer of claim 1 , wherein the living anionic elastomer is derived from butadiene and styrene.
5. The functionalized elastomer of claim 1 , wherein the polymerization terminator of formula I is ESTI, 1-ethoxy-3,7,10-trimethylsilatrane.
6. The functionalized elastomer of claim 1 , wherein the polymerization terminator of formula I is BSTI, 1-isobutyl-3,7,10-trimethylsilatrane.
7. The functionalized elastomer of claim 1 , wherein the polymerization terminator of formula I is OSTI, 1-octyl-3,7,10-trimethylsilatrane.
8. The functionalized elastomer of claim 1 , wherein the polymerization terminator of formula I is BIPOS, 1,2-bis(3,7,10-trimethylsilatrane)ethane.
9. The functionalized elastomer of claim 1 , wherein the polymerization terminator of formula I is selected from the group consisting of the following structures
10. The functionalized elastomer of claim 1 , wherein the polymerization terminator of formula I has the structure
11. The functionalized elastomer of claim 1 , wherein the polymerization terminator of formula I has the structure
12. The functionalized elastomer of claim 1 , wherein the polymerization terminator of formula I has the structure
13. The functionalized elastomer of claim 1 , wherein the polymerization terminator of formula I has the structure
14. A rubber composition comprising the functionalized elastomer of claim 1 .
15. The rubber composition of claim 14 , further comprising silica.
16. A pneumatic tire comprising the rubber composition of claim 15 .