Method for reducing particle size

Details Method for reducing particle size Method for reducing particle size

1974-01-11

1976-02-03

White, Robert F.

Plastic and nonmetallic article shaping or treating: processes

With step of cooling to a temperature of zero degrees c. or...

B05B 300

Patent

active

039365174

ABSTRACT:
A method for processing solvent soluble solids to produce micron size particles of the solids is disclosed. A solvent solution of a material such as a polymer is prepared, frozen, comminuted, and mixed under conditions of high shear with a non-solvent liquid which is miscible with the solvent but in which the polymeric material is insoluble. When the temperature of the mixture exceeds the melting point of the solvent, the solvent melts and diffuses into the non-solvent liquid and the polymeric material is caused to precipitate out of solution in the form of finely divided particles having a normal particle size distribution. The freezing and comminution of the solvent solution of polymeric material may be accomplished in a one step process in-situ by slowly adding the polymer solution to the non-solvent liquid under conditions of high shear agitation, the non-solvent liquid being maintained at a temperature substantially below the melting point of the solvent whereby dispersed droplets of the solution are caused to freeze prior to substantial diffusion of the solvent into the non-solvent liquid.

REFERENCES:
patent: 3681011 (1972-08-01), Gazza et al.

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