Production of high impact and stiff polystyrene

Details Production of high impact and stiff polystyrene Production of high impact and stiff polystyrene

C - Chemistry, Metallurgy

08

F

400/2041

C08F 297/04 (2006.01) C08F 279/02 (2006.01)

Patent

CA 1193038

ABSTRACT OF THE DISCLOSURE A process for produc ing a high impact poly- styrene characterized by polymerizing a conjugated diene (preferably, 1,3-butadiene) by the use of an organo- lithium-based catalyst containing a polyfunctional organolithium compound (preferably, said organolithium- based catalyst is a mixture of a polyfunctional organo- lithium compound and a monofunctional organolithium compound at such a mixing ratio that the amount of lithium atom in the polyfunctional organolithium compound is 5% by weight or more based on the total sum of the lithium atoms in the respective compounds), coupling the resulting polymer molecules with a polyfunctional treating agent having at least two (preferably, 2-4 on the average) reactive sites capable of reacting with the active lithium terminal of the polymer, dissolving in styrene the conjugated diene polyemr thus obtained, which has substantially a network structure and is sub- stantially soluble in styrene, preferably in a proportion of 2 - 30% by weight, and then radical-polymerizing the resulting solution by bulk polymerization or bulk-sus- pension polymerization.

383046

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