Process for producing diene rubbers polymerized by means of Nd catalysts and exhibiting reduced cold flow and low intrinsic odor

US5567784A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Wolfgang Wieder · Lillebonne, FR
• Dieter Kuhlmann · Dormagen, DE
• Wolfgang Nentwig · Bensberg, DE

Key dates

• Filing date: Sep 20, 1995
• Grant date: Oct 22, 1996
• Expiry date: Sep 20, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F36/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The production of diene rubbers polymerized by means of Nd catalysts and having reduced cold flow and low intrinsic odor is effected by the polymerization of diolefines adiabatically at temperatures of -20.degree. to 150.degree. C. in the presence of inert organic solvents and in the presence of metallo-organic mixed catalysts based on neodymium carboxylate, by subsequently depressurizing the reaction mixture obtained in this manner by reducing the pressure, and by treating the reaction mixture thereafter with disulphur dichloride, sulphur dichloride and/or thionyl chloride.