Functionalized polymer, rubber composition and pneumatic tire

Patent metadata

Field	Value
Publication number	US-2016376394-A1
Application number	US-201615203874-A
Country	US
Kind code	A1
Filing date	Jul 7, 2016
Priority date	Aug 20, 2014
Publication date	Dec 29, 2016
Grant date	—

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

1 - 11 . (canceled)

12 . A method of making a functionalized elastomer, comprising the steps of
polymerizing a diene based monomer in the presence of an anionic polymerization initiator to produce a polydiene anionic living polymer; further polymerizing the polydiene anionic living polymer with from 1 to 10 equivalents of a styrenic monomer per equivalent of initiator to produce a polydiene-polystyrenic anionic living polymer; and terminating the polydiene-polystyrenic anionic living polymer with a terminator to form the functionalized elastomer, wherein the terminator is 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 16 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 C1 to C18 linear or branched alkyl;
Q is N or a group of structure IX

wherein R 14 is C1 to C8 alkyl.

13 . The method of claim 12 , wherein the diene based monomer is 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.

14 . The method of claim 12 , wherein the styrenic monomer 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.

15 . The method of claim 12 , wherein the diene based monomer is selected from the group consisting of 1,3-butadiene and isoprene, and the styrenic monomer is styrene.

16 . The method of claim 12 , wherein n ranges from 5 to 10.

17 . The method of claim 12 , wherein the polydiene has a molecular weight Mn ranging from 50K to 500K.

18 . (canceled)

19 . (canceled)

Assignees

• Goodyear Tire & Rubber

Inventors

• Ma Liqing

Classifications

• B60C1/00 Primary

  Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition · CPC title

• C08C19/00

  Chemical modification of rubber · CPC title

• C08F297/044

  using a coupling agent · CPC title

• C08K3/36

  Silica · CPC title

• C08F297/04

  polymerising vinyl aromatic monomers and conjugated dienes · CPC title