Process for Manufacturing Vinyl-rich Polybutadiene Rubber

Assignee Changchun Institute of Applied Chemistry Chinese Academy of Science (Changchun, CN) 

A method for converting 1,3-butadiene into polybutadiene having at least an 88.4% vinyl content using iron isooctanoate, triisobutylaluminum, and ethyl phosphite is described. The optimum weight ratio of reagents of aluminum/iron was 5 100 with a phosphite/iron ratio of 1 20, respectively. 

A reactor was charged with 84 ml of hexane and butadiene (10 g) and then treated sequentially with iron isooctanoate (0.0124 mmol), triisobutylaluminum (0.19 mmol), and ethyl phosphite (0.0295 mmol). The mixture was placed into a 50°C water bath and polymerized for 4 hours. Thereafter an aqueous alcohol solution containing 2,6-di(t-butyl)-4-cresol was added to precipitate the mbber sample. The material was dried, and the product was isolated. 

TABLE 1. Conversion of 1,3-bntadiene into poly(bntadiene) having a bigb vinyl content nsing iron isooctanoate, triisobutylalnminnm, and etbyl pbospbite. 

Entry Reagent Addition Iron Isooctanoate (A) Triisobutylaluminum (B) Ethyl Phosphate (C) Conversion (%) [p] (dL/g) Gel Eormation (%) Vinyl Content (%) Lg fC) 

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Title Process for Manufacturing Vinyl-rich Polybutadiene Rubber... 

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