Process for production of polymer particles

Details Process for production of polymer particles Process for production of polymer particles

1996-08-14

1998-03-10

Merriam, Andrew E.C.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524464, 528491, 528497, 528498, 528501, C08J 312, C08J 314, C08G 6362

Patent

active

057262233

ABSTRACT:
A process for producing polymer particles from an organic solvent solution of a polymer, which includes: (a) initially introducing polymer particles into a particle producing zone, (b) introducing an organic solvent solution containing an organic solvent and having a polymer concentration of 3 to 70% by weight, onto the polymer particles which are maintained in the particle producing zone, the particle producing zone not substantially containing steam, the organic solvent solution being added in an amount of not more than 250% by weight per hour based on the amount of the polymer particles which are initially held in the particle producing zone, and stirring the polymer particles under conditions in which the organic solvent would be vaporized, (c) separately introducing a poor solvent for the polymer into the particle producing zone, the poor solvent being selected from the group consisting of benzene, toluene, xylene, pentane, hexane, octane, acetone and methyl ethyl ketone, the poor solvent being in an amount of 5 to 200% by weight based on the weight of the organic solvent in the organic solvent solution, and (d) evaporating the organic solvent and the poor solvent, while maintaining the organic solvent solution of the polymer in contact with the polymer particles which are maintained in the particle producing zone, to produce the polymer particles.

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