Direct method for preparing syndiotactic 1,2-polybutadiene

Details Direct method for preparing syndiotactic 1,2-polybutadiene Direct method for preparing syndiotactic 1,2-polybutadiene

1986-01-23

1987-02-24

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 92, C08F 470

Patent

active

046458093

ABSTRACT:
Short fibers of syndiotactic 1,2-polybutadiene are utilized in making tires that have improved resistance against heat build-up and improved wear characteristics. The preparation of syndiotactic 1,2-polybutadiene in fibrous form has traditionally involved an extrusion and stretching step. However, the technique of the present invention circumvents the necessity of hot mill flexing and/or extrusion in making fibrous syndiotactic 1,2-polybutadiene. The present invention more specifically involves a process for preparing syndiotactic 1,2-polybutadiene fibers directly comprising polymerizing 1,3-butadiene monomer in the presence of (1) a catalyst composition which is comprised of (a) a cobalt compound and (b) an organoaluminum compound; (2) carbon disulfide; and (3) at least one member selected from the group consisting of liquid polymers and naphthenic oils.

REFERENCES:
patent: 4051308 (1977-09-01), Halasa
patent: 4501867 (1985-02-01), Ueno

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