Toner

Patent metadata

Field	Value
Publication number	US-9557666-B2
Application number	US-201414328053-A
Country	US
Kind code	B2
Filing date	Jul 10, 2014
Priority date	Nov 18, 2010
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

Abstract

A toner prepared by a method comprising granulating while polymerizing a ring-opening polymerizable monomer with a catalyst under the presence of a surfactant and a colorant in a compressible fluid.

First claim

What is claimed is:

1. A method of preparing toner, comprising:
granulating while polymerizing a ring-opening polymerizable monomer with a catalyst for ring-opening polymerization under the presence of a surfactant and a colorant in a compressible fluid, wherein a particulate polymer seed is added to the compressible fluid onto which the ring-opening polymerizable monomer undergoes polymerization, wherein the ring-opening polymerizable monomer is at least one member selected from the group consisting of cyclic esters and cyclic carbonates, and wherein the compressible fluid comprises carbon dioxide.

2. The method of claim 1 , wherein the catalyst is an organic catalyst which is a nucleophilic nitrogen compound having basicity.

3. The method of claim 2 , wherein the organic catalyst is a cyclic compound having a nitrogen atom.

4. The method of claim 2 , wherein the organic catalyst is a member selected from the group consisting of cyclic amines, cyclic diamines, cyclic diamine compounds having amidine skeleton, cyclic triamine compounds having a guanidine skeleton, heterocyclic aromatic organic compounds including a nitrogen atom and N-heterocyclic carbene.

5. The method of claim 4 , the organic catalyst is a member selected from the group consisting of 1,4-diazabicyclo-[2.2.2]octane (DABCO), 1,8-diazabicyclo[5.4.0]undeca-7-ene(DBU)), 1,5,7-triazabicyclo[4.4.0]deca-5-ene (TBD), diphenylguanidine (DPG), N,N-dimethyl-4-aminopyridine (DMAP), 4-pyrolidinopyridine (PPY) and 1,3-di-tert-butylimidazole-2-ylidene (ITBU).

6. The method of claim 1 , wherein the colorant is a pigment.

7. The method of claim 1 , wherein the ring-opening polymerizable monomer is L- or D-lactide.

8. The method of claim 1 , wherein the surfactant has affinity with the compressible fluid and the ring-opening polymerizable monomer.

9. The method of claim 1 , wherein the surfactant has a perfluoroalkyl group, polydimethylsiloxane group or a polyacrylate group.

10. The method of claim 1 , wherein the toner has a ratio (Mw/Mn) of a weight-average molecular weight (Mw) to a number-average molecular weight (Mn) not greater than 1.5.

Assignees

• Yamauchi Yoshitaka
• Tanaka Chiaki
• Nemoto Taichi
• Ricoh Co Ltd

Inventors

• Yamauchi Yoshitaka
• Tanaka Chiaki
• Nemoto Taichi

Classifications

• C08G63/79

  Interfacial processes, i.e. processes involving a reaction at the interface of two non-miscible liquids · CPC title

• C08G63/823

  for the preparation of polylactones or polylactides · CPC title

• G03G9/0808

  by dry mixing the toner components in solid or softened state · CPC title

• G03G9/0812

  Pretreatment of components · CPC title

• C08G63/81

  using solvents (C08G63/79 takes precedence) · CPC title