Process for the production of polycarbonate powder
AssigneeIdemitsu Petrochemical Co., Ltd.
InventorsMasaya Okamoto, Noriyuki Kunishi
Life of this patent
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Abstract
A process for the production of a polycarbonate powder comprising introducing an organic solvent solution of polycarbonate and steam into a mixing nozzle and obtaining the polycarbonate powder from a mixture ejected from the mixing nozzle, wherein the organic solvent solution contains 3 to 45% by weight of the polycarbonate, and the ratio of the weight of steam/the weight of an organic solvent in the organic solvent solution is 1/10 to 1/5.
Claims30
A process for the production of a polycarbonate powder having a high bulk density, comprising
- introducing
- (i) an organic solvent solution containing an organic solvent and a polycarbonate and (ii) steam into a mixing nozzle and
- recovering the polycarbonate as a powder from a mixture ejected from the mixing nozzle, the organic solvent solution containing 3 to 45% by weight of the polycarbonate, and a ratio of a weight of steam (W.sub.s)/ a weight of the organic solvent in the organic solvent solution (W.sub.o) being 1/10 to 1/5.
A process for the production of a polycarbonate powder having a high bulk density, which comprises
- introducing an organic solvent solution having a polycarbonate concentration of 3 to 45% by weight and steam in an amount of 1/20 to 1/8 of the weight of an organic solvent in the organic solvent solution, into a mixing nozzle;
- mixing a mixture ejected from the mixing nozzle with steam in an amount of 1/200 to 1/1 of the weight of the organic solvent in the organic solvent solution, after a residence time of 0.001 to 1 second, to obtain a second mixture;
- and
- recovering a polycarbonate as a powder from the second mixture.
A process for the production of a polycarbonate having a high bulk density, which comprises
- introducing (i) an organic solvent solution containing an organic solvent and a first polycarbonate in a concentration of 3 to 45% by weight, (ii) steam and (iii) a second polycarbonate powder into a mixing nozzle;
- and
- recovering a resultant polycarbonate as a powder from a mixture ejected from the mixing nozzle.
A process for the production of a polycarbonate having a high bulk density, which comprises
- introducing (i) an organic solvent solution containing an organic solvent and a polycarbonate in a concentration of 3 to 45% by weight and (ii) steam into a mixing nozzle;
- introducing a mixture ejected from the mixing nozzle, into a mixer directly from the mixing nozzle or through a conduit;
- introducing a mixture from the mixer, into a gas-solid separator through a conduit;
- and
- recovering the polycarbonate by the gas-solid separator.
Dependencies are inferred from the claim text.