Sumitomo Chemical Company, Limited

Sumitomo Chemical Advanced Technologies LLC

Koichiro Tajima

Tamon Itahashi

C Michael Walkup

David P McNaughton

Michael C Walkup

A resorcinolic novolac resin composition comprising the reaction product of (i) an aldehyde or ketone, and (ii) aralkyl-substituted resorcinol and resorcinol, where the moles of the aralkyl-substituted resorcinol to the total moles of the resorcinol and aralkyl-substituted resorcinol is 0.01:1 to 0.4:1.

Novolac resins and use in rubber compositions

Disclosed is a conjugated diene polymer comprising a conjugated diene as a monomeric unit. The conjugated diene polymer is obtained by a polymerization reaction in a reaction solution comprising a conjugated diene, at least one compound selected from the group consisting of limonene, terpinene, and terpinolene, and an organoalkali metal compound as a polymerization initiator. Mz/Mn is 1.7 or more and 4.0 or less, when Mz is a Z-average molecular weight of the conjugated diene polymer, Mn is a number average molecular weight of the conjugated diene polymer, and the Z-average molecular weight and the number average molecular weight are values in terms of polystyrene by gel permeation chromatography.

Conjugated diene polymer and conjugated diene polymer composition

Disclosed is a conjugated diene polymer obtained by a polymerization reaction in a polymerization solution comprising a conjugated diene, a compound represented by the following formula (1) or formula (2), and an organoalkali metal compound as a polymerization initiator: wherein Rin formula (1) represents an alkenyl group having 2 or more and 10 or less carbon atoms.

There is disclosed a modified conjugated diene polymer including a structural unit derived from a compound represented by formula (1), and a structural unit derived from a conjugated diene. When n is 0, at least two of R, R, R, R, Rand Rare substituted amino groups, and at least one is a hydroxy group or hydrocarbyloxy group.

Modified conjugated diene polymer, and polymer composition containing said polymer

Disclosed is a method for producing a conjugated diene-based polymer capable of affording a polymer composition useful as a material for tires excellent in fuel economy. Specifically, there is disclosed a method comprising polymerizing monomer components comprising a conjugated diene compound and an aromatic vinyl compound using an alkali metal-based polymerization initiator in the presence of a hydrocarbon solvent and an ether compound represented by the following formula (1), wherein R represents an alkyl group having 1 to 8 carbon atoms. 

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Pittsburgh, PA, United States of America

Koichiro Tajima