Particles and method for producing particles

Patent metadata

Field	Value
Publication number	US-9669565-B2
Application number	US-201314397715-A
Country	US
Kind code	B2
Filing date	Apr 30, 2013
Priority date	May 2, 2012
Publication date	Jun 6, 2017
Grant date	Jun 6, 2017

Abstract

A method for producing particles, which contains: bringing a compressive fluid and a pressure plastic material into contact with each other to melt the pressure plastic material; and jetting a melt obtained by melting the pressure plastic material to form particles, wherein the jetting the melt is performed by a two-fluid nozzle or three-fluid nozzle.

First claim

The invention claimed is:

1. A method for producing particles, comprising:
contacting a first compressive fluid with a pressure plastic material, thereby producing a melt; and
jetting the melt, thereby forming particles,
wherein the jetting is performed with a three-fluid nozzle in which a third-fluid nozzle supplies a second compressive fluid to an outer circumference of a two-fluid nozzle that supplies the first compressive fluid and the melt, and
wherein the first compressive fluid comprises carbon dioxide in a super critical state, and the second compressive fluid comprises nitrogen in a super critical state.

2. The method according to claim 1 , wherein the pressure plastic material is a resin comprising a carbonyl structure.

3. The method according to claim 1 , wherein a viscosity of the melt is 20 mPa·s or lower at a temperature and pressure while jetting.

4. The method according to claim 1 , wherein both the contacting and jetting are continuous thereby continuously forming particles.

5. The method according to claim 4 , wherein the contacting is continuous and does not comprise the use of a static mixer.

6. The method according to claim 1 , wherein the first compressive fluid comprises carbon dioxide.

7. The method according to claim 1 , wherein contacting the compressive fluid and the pressure plastic material further comprises heating and plasticizing the pressure plastic material prior to contacting with the fluid.

8. Particles, comprising:
substantially no organic solvent,
wherein the particles are obtained by
contacting a first compressive fluid and a pressure plastic material with each other thereby producing a melt, and
jetting the melt to form the particles,
wherein the jetting is performed with a three-fluid nozzle in which a third-fluid nozzle supplies a second compressive fluid to an outer circumference of a two-fluid nozzle that supplies the first compressive fluid and the melt, and
wherein the first compressive fluid comprises carbon dioxide in a super critical state, and the second compressive fluid comprises nitrogen in a super critical state.

9. The particles according to claim 8 , wherein a ratio of a volume average particle diameter (Dv) to a number average particle diameter (Dn) of the particles, Dv/Dn, is from 1.0 to 1.10.

10. The method according to claim 1 , wherein a ratio of a volume average particle diameter (Dv) to a number average particle diameter (Dn) of the particles, Dv/Dn, is from 1.0 to 1.10.

Assignees

• Osaka Keiko
• Tanaka Chiaki
• Ricoh Co Ltd

Inventors

• Osaka Keiko
• Tanaka Chiaki

Classifications

• B29K2075/00

  Use of {PU, i.e.} polyureas or polyurethanes {or derivatives thereof}, as moulding material · CPC title

• C08G18/341

  Dicarboxylic acids, esters of polycarboxylic acids containing two carboxylic acid groups · CPC title

• B05B7/0483

  with gas and liquid jets intersecting in the mixing chamber · CPC title

• B01J2/04 Primary

  in a gaseous medium {(if combined with suspending the material in a gas, e.g. fluidised beds B01J2/16)} · CPC title

• B05B7/068

  the annular gas outlet being supplied by a gas conduit having an axially concave curved internal surface just upstream said outlet · CPC title