Preparation of a non-linear, elastomeric copolymer

Details Preparation of a non-linear, elastomeric copolymer Preparation of a non-linear, elastomeric copolymer

C - Chemistry, Metallurgy

08

F

400/2044

C08F 297/04 (2006.01) C08G 81/02 (2006.01)

Patent

CA 1067643

ABSTRACT OF THE DISCLOSURE Non-linear, solution diene rubbers, e.g. SBR, obtain improved green strength, if less than 30% of the polymer chains is "capped" with a polystyrene block having a mol. weight of, e.g., 20,000. They are obtained by coupling polymer blocks B'-Li and A-B-Li in a molar ratio of at least 2.5 with an at least trifunctional coupling agent, wherein A is a polymer block of a monoalkenyl or monoalkenylidene aromatic hydrocarbon having an average molecular weight between 5,000 and 35,000, B and B' are polymer blocks substantially comprising polymerized con- jugated diene molecules. These rubbers exhibit an improved green strength whilst retaining adequate processability and satisfactory properties after vulcanization.

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