Method for producing a high impact polystyrene

Details Method for producing a high impact polystyrene Method for producing a high impact polystyrene

1976-07-08

1978-03-28

Michl, Paul R.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260 4AR, 260 95C, 526 64, C08L 906, C08L 806

Patent

active

040814971

ABSTRACT:
In the method for producing a high impact polystyrene from a monomer of styrene or/and its derivative and a rubbery polymer as reactants, an improvement is provided which comprises passing said reactants through a tubular reactor having parts where the passage way of flow of said reactants is constricted, while keeping said reactants in a laminar flow as much as possible in the parts other than said parts, in a first stage polymerization to prepare a reacted mixture containing a prepolymer until the conversion of monomer to polymer becomes 10 to 60%, and subjecting the resulting reacted mixture to a second stage polymerization in the state where almost no shearing is exerted thereupon.
The shearing during said first stage polymerization can be uniformly carried out.
The resulting product has superior high impact properties.

REFERENCES:
patent: 3052664 (1962-09-01), Cleland
patent: 3054783 (1962-09-01), Lashua
patent: 3451986 (1969-06-01), Metais
patent: 3595846 (1971-07-01), Rouzier
patent: 3679651 (1972-07-01), Toshimichi
patent: 3980628 (1976-09-01), Sorenson

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