Functionalized polymer, rubber composition and pneumatic tire

Patent metadata

Field	Value
Publication number	US-9428628-B2
Application number	US-201514755533-A
Country	US
Kind code	B2
Filing date	Jun 30, 2015
Priority date	Aug 20, 2014
Publication date	Aug 30, 2016
Grant date	Aug 30, 2016

Abstract

The present invention is directed to a functionalized elastomer having the formula

(P-B n ) q -X

where P is a polydiene segment, B is a styrenic monomer residue, n is the number of styrenic monomer residues, and B n is a polystyrenic segment; X is a multifunctional terminator residue, and q is the number of (P-B n ) chains coupled to X; wherein for q=1, the weight percent of the functionalized elastomer is at least 90 percent by weight.

First claim

What is claimed is:

1. A functionalized elastomer having the formula
(P-B n ) q -X
where P is a polydiene segment, B is a styrenic monomer residue, n is the number of styrenic monomer residues, and B n is a polystyrenic segment; and q is the number of (P-B n ) chains coupled to X; wherein for q=1, the weight percent of the functionalized elastomer is at least 90 percent by weight; wherein X is a polymerization terminator of formula I

wherein R 1 is C1 to C4 linear alkyl, or C1 to C4 branched alkanediyl;
in formula I X 1 , X 2 , X 3 are independently S, a group of formula II, or a group of formula III;

where R 2 is C1 to C18 linear or branched alkyl;
Z is R 3 , —OR 4 , or —R 5 —X 4 ; R 3 , R 4 are independently C1 to C18 linear or branched alkyl; R 5 is C1 to C18 alkanediyl or dialkyl ether diyl, with the proviso when R 5 is C1 to C18 dialkyl ether diyl, X 1 , X 2 , X 3 may be independently O, S, a group of formula II, or a group of formula III;
X 4 is halogen or a group of structure IV, V, VI, VII or VIII

wherein R 6 , R 7 , R 8 , R 9 , and R 10 are independently H or C1 to C8 alkyl; R 11 is C2 to C8 alkanediyl;
R 12 and R 13 are independently H, aryl or C1 to C8 alkyl; X 5 , X 6 , X 7 are independently O, S, or a group of formula II or III where R 2 is C 1 to C 18 linear or branched alkyl;
Q is N or a group of structure IX

wherein R 14 is C1 to C8 alkyl.

2. The functionalized elastomer of claim 1 , wherein the polydiene segment is polymerized from monomers selected from the group consisting of 1,3-butadiene, isoprene, 1,3-pentadiene, 2,3-dimethyl- 1,3-butadiene, 2-methyl-1,3-pentadiene, 2,3-dimethyl-1,3-pentadiene, 2-phenyl-1,3-butadiene, and 4,5-diethyl-1,3-octadiene.

3. The functionalized elastomer of claim 1 , wherein B is selected from the group consisting of styrene, 3-methylstyrene, 3,5-diethylstyrene, 4-propylstyrene, 2,4,6-trimethylstyrene, 4-dodecylstyrene, 3-methyl-5-normal-hexylstyrene, 4-phenylstyrene, 2-ethyl-4-benzylstyrene, 3,5-diphenylstyrene, 2,3,4,5-tetraethylstyrene, and α-methylstyrene.

4. The functionalized elastomer of claim 1 , wherein the polydiene segment is polymerized from monomers selected from the group consisting of 1,3-butadiene and isoprene, and B is styrene.

5. The functionalized elastomer of claim 1 , wherein n ranges from 1 to 10.

6. The functionalized elastomer of claim 1 , wherein P has a molecular weight Mn ranging from 50K to 500K.

7. The functionalized elastomer of claim 1 , wherein for q=1, the weight percent of the functionalized elastomer is at least 90 percent by weight.

8. A rubber composition comprising the functionalized elastomer of claim 1 .

9. The rubber composition of claim 8 , further comprising silica.

10. A pneumatic tire comprising the rubber composition of claim 9 .

Assignees

• Goodyear Tire & Rubber

Inventors

• Ma Liqing

Classifications

• C08F236/10

  with vinyl-aromatic monomers · CPC title

• C08L19/006

  Rubber characterised by functional groups, e.g. telechelic diene polymers · CPC title

• C08K3/36 Primary

  Silica · CPC title

• C08C19/00

  Chemical modification of rubber · CPC title

• C08C19/25

  Incorporating silicon atoms into the molecule · CPC title