The Goodyear & Tire Rubber Company

Liqing Ma

Bruce Raymond Hahn

Ralf Mruk

Paul Harry Sandstrom

Frank James Feher

Frank Schmitz

Robert Fokko Roskamp

Seth Cody Ensign

Arindam Mazumdar

Georges Marcel Victor Thielen

Eric Sean Castner

Michael Joseph Rachita

George Jim Papakonstantopoulos

Rudolf Wilhelm Zentel

Margaret Flook Vielhaber

Alexandra Hermann

Nicola Costantini

Margaret McGuigen Vielhaber

Dan Qu

Jena Lynn Johngrass

Margaret Mcguigan Vielhaber

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 (1) where the substituent structures are further defined.

Functionalized polymer, rubber composition and pneumatic tire

The compatibility between silica fillers and synthetic rubbers which are synthesized utilizing lanthanide-based catalyst systems, such as neodymium catalyst systems can be improved by terminating the polymerization with a vinyl silane terminating agent. In doing so the vinyl silane is allowed to react with the polymer chain ends of the neodymium rubber to functionalize the chain ends of the polymer chains with silicon containing groups. This results in the rubber having better characteristics for utilization in tire rubber formulations, such a tire tread formulations, that exhibit improved wear characteristics and lower rolling resistance. The process for the synthesis of such functionalized polydiene rubber comprises (1) polymerizing a diene monomer in the presence of a lanthanide-based catalyst system, and (2) terminating the polymerization with a vinyl silane terminator. The functionalized polydiene rubber composition made by this method is comprised of a polydiene rubber which is functionalized at its chain ends with a silicon containing group.

Silicon-functionalized rubber

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 where n is an integer from 1 to 3;X is a tetravalent organic group selected from a hydrocarbyl group of formula CHwhere mis an integer from 1 to 10, a group of formula II where Ris C1 to C10 alkane diyl, and the group of phenyl diyl;Rand Rare independently selected from C1 to C10 alkyl, and a group of formula III where R, Rare independently C1 to C10 alkyl, and Ris C1 to C10 alkanediyl;or Rand Rtaken together with their common Si atom form a five-membered heterocyclic ring selected from formulas IV and V where R7 is from C1 to C10 alkyl.

The present invention is directed to a functionalized elastomer comprising the reaction product of a living anionic elastomeric polymer and a polymerization terminator comprising the reaction product of a polyol of formula I with an alkoxysilane of formula II where Rand Rare independently C1 to C10 alkyl; k is an integer from 2 to 4; n is an integer from 2 to 3, and n+m=4; with the proviso that when k=2 or 3, n=2 and when k=4, n=2 or 3.

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 Ris C1 to C4 linear alkyl, or C1 to C4 branched alkanediyl; X, X, Xare independently O, S, or a group of formula (II) or (III) where Ris C1 to C18 linear or branched alkyl; and Z is &#x2014;R&#x2014;CH&#x2550;CH&#x2014;R, where Ris a covalent bond or C1 to C18 linear or branched alkanediyl, and Ris a hydrogen or C1 to C18 linear or branched alkyl.

The invention relates to preparation of a precipitated silica reinforced rubber composition which contains styrene/butadiene elastomer modified with a combination of bis(3-triethoxysilylpropyl) polysulfide silica coupler and mercaptoorganoalkoxysilane, a rubber composition thereof and a tire with a component of such rubber composition.

Preparation of silica reinforced rubber containing styrene/butadiene elastomer, rubber composition and tire with component

The present invention is directed to a functionalized elastomer comprising the 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 Ris C1 to C4 linear alkyl, or C1 to C4 branched alkanediyl; X, X, Xare independently O, S, or a group of formula (II) or (III)  where Ris C1 to C18 linear or branched alkyl; Z is R, &#x2014;OR, or &#x2014;R&#x2014;X; R, Rare independently C1 to C18 linear or branched alkyl; Ris C1 to C18 alkanediyl or dialkyl ether diyl; Xis halogen or a group of structure IV, V, VI, VII or VIII     wherein R, R, R, R, and Rare independently H or C1 to C8 alkyl; Ris C2 to C8 alkanediyl; Rand Rare independently H, aryl or C1 to C8 alkyl;Q is N or a group of structure IX wherein Ris C1 to C8 alk.

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 Ris C1 to C4 linear alkyl, or C1 to C4 branched alkanediyl; where Ris C1 to C18 linear or branched alkyl; wherein R, R, R, R, and Rare independently H or C1 to C8 alkyl; Ris C2 to C8 alkanediyl; Rand Rare independently H, aryl or C1 to C8 alkyl; wherein Ris C1 to C8 alkyl.

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

The present invention is directed to a polymer blend, the blend including a diene-based elastomer grafted with a substituted acrylamide polymer through a sulfur atom, and from 1 to 20 percent by weight of an additional polymer miscible with the substituted acrylamide polymer.

Blend of a graft copolymer and a second polymer miscible with sidechains of the graft copolymer

The present invention is directed to a bifunctionalized elastomer comprising the reaction product of (1) a living anionic elastomeric polymer initiated with a functional initiator and (2) a functional polymerization terminator.

Bifunctionalized polymer

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 Ris C1 to C4 linear or branched alkanediyl; wherein R, R, R, R, and Rare independently H or C1 to C8 alkyl; Ris C2 to C8 alkanediyl; Rand Rare independently H, aryl or C1 to C8 alkyl; wherein Ris C1 to C8 alkyl.

The present invention is directed to a rubber composition comprising a bifunctionalized elastomer comprising the reaction product of 1) a living anionic elastomeric polymer initiated with a functional initiator and 2) a functional polymerization terminator; and a filler selected from silica and carbon black. The invention is further directed to a pneumatic tire comprising the rubber composition.

Rubber composition and pneumatic tire

The present invention is directed to a pneumatic tire comprising at least one component, the at least one component comprising a polymer blend comprising a copolymer and an additional polymer, the copolymer comprising: a polymeric backbone chain derived from a monomer comprising at least one conjugated diene monomer and optionally at least one vinyl aromatic monomer; and polymeric sidechains bonded to the backbone chain, the sidechains comprising a polymer immiscible with the backbone; the additional polymer consisting of a polymer miscible with the polymeric sidechains.

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Uniontown, OH, United States of America

Liqing Ma