C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/3063, 400/91
C08L 9/00 (2006.01) C08C 2/00 (2006.01) C08L 25/04 (2006.01) C08L 53/02 (2006.01)
Patent
CA 1182237
METHOD FOR PREPARING COLOR-FREE, STABILIZED POLYMERS OF CONJUGATED DIENES OR VINYL AROMATIC HYDROCARBONS OR COPOLYMERS OF CONJUGATED DIENES AND VINYL AROMATIC HYDROCARBONS ABSTRACT OF THE DISCLOSURE A method for preparing essentially color-free, stab- ilized polymers of conjugated dienes or vinyl aromatic hydrocarbons or copolymers of conjugated dienes and vinyl aromatic hydrocarbons involves a first stage in which a living polymer of a conjugated diene of vinyl aromatic hydrocarbon or copolymer of a conjugated diene and a vinyl aromatic hydrocarbon is prepared by anionically polymerizing the conjugated diene or vinyl aromatic hydrocarbon, or copolymerizing the conjugated diene and the vinyl aromatic hydrocarbon using a lithium-based catalyst and an inert hydrocarbon diluent. Then, the living polymer or copolymer is terminated by the addition of a suitable terminating agent. Following the term- ination procedure, boric acid is added to the polymer or copolymer in a sufficient amount to prevent or substantially reduce color formation. Then, stabilizing agents are added to the polymer or copolymer and the polymer of copolymer is recovered from the diluent. BACKGROUND OF THE INVENTION The invention relates to a method for preparing es- sentially color-free, stabilized polymers of conjugated dienes or vinyl aromatic hydrocarbons or copolymers of conjugated dienes. - 1 -
420566
Firestone Polymers Llc
Firestone Tire & Rubber Company (the)
Robic Robic & Associes/associates
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