Process for producing high impact polystyrene

Details Process for producing high impact polystyrene Process for producing high impact polystyrene

1981-08-05

1984-11-13

Michl, Paul R.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525316, C08F27902

Patent

active

044826770

ABSTRACT:
A process for producing a high impact polystyrene characterized by polymerizing a conjugated diene (preferably, 1,3-butadiene) by the use of an organolithium-based catalyst containing a polyfunctional organolithium compound (preferably, said organolithium-based cataylst is a mixture of a polyfunctional organolithium 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 polymer thus obtained, which has substantially a network structure and is substantially soluble in styrene, preferably in a proportion of 2-30% by weight, and then radical-polymerizing the resulting solution by bulk polymerization or bulk-suspension polymerization.

REFERENCES:
patent: 3177190 (1965-04-01), Hsieh
patent: 3264375 (1966-08-01), Jones
patent: 3280084 (1966-10-01), Zelinski
patent: 3644322 (1972-02-01), Farrar
patent: 3957913 (1976-05-01), Roest et al.
patent: 4004070 (1977-01-01), Farrar
patent: 4340691 (1982-07-01), Lal
R. P. Zelinski and C. F. Wofford, "Synthesis of Trichain and _Tetrachain Radial Polybutadienes," 1965, vol. 3, pp. 93-103, _Journal of Polymer Science: Part A.

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