Continuous process for the production of conjugated diene polymers having narrow molecular weight distribution and products therefrom

US6897270B2 · kind B2 · utility

Assignee

• BRIDGESTONE CORPORATION · JP

Inventors

• Yoichi Ozawa · Tokyo, JP
• David M. Roggeman · North Royalton, US
• H. Jerrold Miller · Panama City, US
• Koji Masaki · Fairlawn, US
• Steven Luo · Copley, US
• Thomas A. Antkowiak · Rittman, US

Key dates

• Filing date: Feb 28, 2002
• Grant date: May 24, 2005
• Expiry date: Feb 28, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F136/06
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A continuous process for producing conjugated diene polymers comprising the steps of contacting, within an hydrocarbon solvent and within a continuous reactor, conjugated diene monomer and a catalyst composition prepared by combining: (a) a lanthanide compound, (b) an alkylating agent, and (c) a halogen-containing compound, and maintaining a non-ideal flow pattern within the continuous reactor so that 10% of the reagents entering the reactor at a reference time t0 are still present within the continuous reactor at a time t0+xtrt, where trt is the residence time corresponding to ideal flow within the continuous reactor and x is a numeral greater than 1.5.