A both terminal-modified conjugated diene-based polymer, which includes a functional group derived from a modification polymerization initiator and a functional group derived from a modifier, and has excellent affinity with a filler and improved mechanical properties and viscoelasticity properties, and a method for preparing the same.

A both terminal-modified conjugated diene-based polymer, which includes a functional group derived from a modification polymerization initiator and a functional group derived from a modifier, and has excellent affinity with a filler and improved mechanical properties and viscoelasticity properties, and a method for preparing the same.

The invention relates to bissilylaminosilyl-functionalized conjugated dienes and their use in the production of rubbers. Further, the invention relates to rubbers and rubber compositions.

The invention relates to bissilylaminosilyl-functionalized conjugated dienes and their use in the production of rubbers. Further, the invention relates to rubbers and rubber compositions.

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.

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.

The present disclosure relates to a composition that includes

##STR00001## where R includes a reactive end group, R.sup.1 includes a first bridging group, 1≤x≤100, and 1≤y≤100.

The present disclosure relates to a composition that includes

##STR00001## where R includes a reactive end group, R.sup.1 includes a first bridging group, 1≤x≤100, and 1≤y≤100.

A production process of a rubber composition containing a modified conjugated diene-based polymer, which can provide a rubber composition in which processability is excellent, and a filling agent, when contained, has favorable dispersibility therein. The production process of the rubber composition includes: a first step of kneading a modified conjugated diene-based polymer that is obtained by polymerizing a monomer containing a conjugated diene compound and has at least one nitrogen-containing functional group selected from a primary amino group, a secondary amino group, a tertiary amino group and groups in which these amino groups have been converted into an onium group, and a basic compound having an acid dissociation constant of 8.0 or more; and a second step of kneading the kneaded product obtained in the first step and a cross-linking agent.

Crumb rubber obtained from recycled tires is subjected to an interlinked substitution process. The process utilizes a reactive component that interferes with sulfur bonds. The resulting treated rubber exhibits properties similar to those of the virgin composite rubber structure prior to being granulated, and is suitable for use in fabricating new tires, engineered rubber articles, and asphalt rubber for use in waterproofing and paving applications.