Method of producing powder composed of precisely spherical particles

Claim 1

A method for producing a powder of spherical particles of a synthetic resin, comprising: a. dissolving a synthetic resin in a volatile organic solvent to form a solution having a viscosity of about 5 to about 200 centistokes; b. directing a spray of said solution under a pressure of at least 6.5 kg/cm2 into a chamber to form spherical particles thereof; c. directing into said chamber a spray of a liquid as a separation agent and intersecting said spray of solution, said resin being insoluble in said liquid separation agent, and the spraying force of said liquid separation agent being about 3 kg/cm2 and less than that of said sprayed solution; d. volatilizing the solvent from the particles of said sprayed solution to form spherical particles of resin powder falling in said chAmber, said particles of liquid separation agent serving to separate said powder particles rendered sticky by said volatilization; and, e. collecting said spherical powder particles in a tank containing said separation agent liquid, from which said powder particles are recovered and dried.

Claim 2

A method for producing a powder of spherical particles of a synthetic resin, comprising: a. dissolving a synthetic resin in a volatile organic solvent to form a solution having a viscosity of about 5 to about 200 centistokes; b. directing a spray of said solution under a pressure of at least 6.5 kg/cm2 into a chamber to form spherical particles thereof; c. directing into said chamber a spray of a liquid as a separation agent and intersecting said spray of solution, said resin being insoluble in said liquid separation agent, and the spraying force of said liquid separation agent being about 3 kg/cm2 and less than that of said sprayed solution; d. volatilizing the solvent from the particles of said sprayed solution to form spherical particles of resin powder falling in said chAmber, said particles of liquid separation agent serving to separate said powder particles rendered sticky by said volatilization; and, e. collecting said spherical powder particles in a tank containing said separation agent liquid, from which said powder particles are recovered and dried.

Claim 3

A METHOD FOR PRODUCING A POWDER OF SPHERICAL PARTICLES OF A SYNTHETIC RESIN, COMPRISING: A. DISSOLVING A SYNTHETIC RESIN IN A VOLATILE ORGANIC SOLVENT TO FORM A SOLUTION HAVING A VISCOSITY OF ABOUT 5 TO ABOUT 200 CENTISTOKES; B. DIRECTING A SPRAY OF SAID SOLUTION UNDER A PRESSURE OF AT LEAST 6.5 KG/CM2 INTO A CHAMBER TO FORM SPHERICAL PARTICLES THEREOF; C. DIRECTING INTO SAID CHAMBER A SPRAY OF A LIQUID AS A SEPARATION AGENT AND INTERSECTING SAID SPRAY OF SOLUTION, SAID RESIN BEING INSOLUBLE IN SAID LIQUID SEPARATION AGENT, AND THE SPRAYING FORCE OF SAID LIQUID SEPARATION AGENT BEING ABOUT 3 KG/CM2 AND LESS THAN THAT OF SAID SPRAYED SOLUTION; D. VOLATILIZING THE SOLVENT FROM THE PARTICLES OF SAID SPRAYED SOLUTION TO FORM SPHERICAL PARTICLES OF RESIN POWDER FALLING IN SAID CHAMBER, SAID PARTICLES OF LIQUID SEPARATION AGENT SERVING TO SEPARATE SAID POWDER PARTICLES RENDERED STICKY BY SAID VOLATILIZATION; AND, E. COLLECTING SAID SPHERICAL POWDER PARTICLES IN A TANK CONTAINING SAID SEPARATION AGENT LIQUID, FROM WHICH SAID POWDER PARTICLES ARE RECOVERED AND DRIED.

Claim 4

A METHOD FOR PRODUCING A POWDER OF SPHERICAL PARTICLES OF A SYNTHETIC RESIN, COMPRISING: A. DISSOLVING A SYNTHETIC RESIN IN A VOLATILE ORGANIC SOLVENT TO FORM A SOLUTION HAVING A VISCOSITY OF ABOUT 5 TO ABOUT 200 CENTISTOKES; B. DIRECTING A SPRAY OF SAID SOLUTION UNDER A PRESSURE OF AT LEAST 6.5 KG/CM2 INTO A CHAMBER TO FORM SPHERICAL PARTICLES THEREOF; C. DIRECTING INTO SAID CHAMBER A SPRAY OF A LIQUID AS A SEPARATION AGENT AND INTERSECTING SAID SPRAY OF SOLUTION, SAID RESIN BEING INSOLUBLE IN SAID LIQUID SEPARATION AGENT, AND THE SPRAYING FORCE OF SAID LIQUID SEPARATION AGENT BEING ABOUT 3 KG/CM2 AND LESS THAN THAT OF SAID SPRAYED SOLUTION; D. VOLATILIZING THE SOLVENT FROM THE PARTICLES OF SAID SPRAYED SOLUTION TO FORM SPHERICAL PARTICLES OF RESIN POWDER FALLING IN SAID CHAMBER, SAID PARTICLES OF LIQUID SEPARATION AGENT SERVING TO SEPARATE SAID POWDER PARTICLES RENDERED STICKY BY SAID VOLATILIZATION; AND, E. COLLECTING SAID SPHERICAL POWDER PARTICLES IN A TANK CONTAINING SAID SEPARATION AGENT LIQUID, FROM WHICH SAID POWDER PARTICLES ARE RECOVERED AND DRIED.