Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1973-12-26
1976-04-27
Henderson, Christopher A.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
526 65, 526 79, 526 87, 526 88, 526173, 526340, C08G29704
Patent
active
039535436
ABSTRACT:
The process disclosed herein involves the preparation of butadiene-styrene copolymers of improved green strength and low running temperature when used in tire compositions, which comprises the steps of polymerizing a mixture of butadiene and styrene in a hydrocarbon solvent having a lithium alkyl initiator therein while the monomer mixture is fed into the polymerization system at a rate slow enough to effect random copolymerization in the resulting polymer backbone, effecting a high degree of branching by conducting the polymerization at a temperature of 90.degree.-175.degree. C. (190.degree.-347.degree. F.) and effecting the final 10-50 percent of the polymerization with a monomer portion containing a higher proportion of styrene than is incorporated into the polymer-backbone, thereby effecting the formation of block polystyrene at the terminals of a plurality of branches. This copolymer of improved green strength and low running temperature is very useful in tire compositions.
REFERENCES:
patent: 3440304 (1969-04-01), Hall
patent: 3449306 (1969-06-01), Zelinski
patent: 3778490 (1973-12-01), Hsieh
Bouton Thomas Chester
Futamura Shingo
Henderson Christopher A.
The Firestone Tire & Rubber & Company
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