Photocurable liquid developer, method for producing the same, developing device and image forming apparatus

• US 8,383,314 B2
• Filed: 12/16/2010
• Issued: 02/26/2013
• Est. Priority Date: 06/17/2009
• Status: Active Grant

• Current Assignee: Ricoh Company Limited
• Original Assignee: Ricoh Company Limited
• Inventors: Shoshi, Masayuki, Kurotori, Tsuneo
• Primary Examiner(s): FRASER, STEWART A
• Application Number:
  US12/970,231
• Publication Number:
  US 20110183254A1
• Time in Patent Office: 803 Days
• Field of Search: 430/112, 430/116
• US Class Current: 430/116
• CPC Class Codes: G03G 15/10 using a liquid developer
• CPC Class Codes: G03G 9/125 characterised by the liquid
• CPC Class Codes: G03G 9/132 obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds

Abstract

To provide a photocurable liquid developer including colored resin particles, and an electrically insulating liquid that cures by light, wherein the electrically insulating liquid contains an unsaturated group-containing silicone compound represented by General Formula (1) below,

• • where R independently denotes a methyl group or a phenyl group, l and m each independently denote an integer of 0 to 100, and X₁, X₂ and X₃ each independently denote a C1-C6 alkyl group or Substituent A below, with at least one of X₁, X₂ and X₃ being Substituent A,

• • where R denotes a methyl group or a phenyl group, and n denotes an integer of 2 or 3.

Claims

1. A photocurable liquid developer comprising:

colored resin particles; and

an electrically insulating liquid that cures by light,

wherein the electrically insulating liquid contains an unsaturated group-containing silicone compound represented by General Formula (1) below,

2. The photocurable liquid developer according to claim 1, wherein the unsaturated group-containing silicone compound is a compound represented by General Formula (2) below,

3. The photocurable liquid developer according to claim 1, further comprising a photopolymerization initiator.

4. The photocurable liquid developer according to claim 1, wherein the colored resin particles contain at least a binder resin and a colorant and have an acidic group at surfaces thereof, and wherein the colored resin particles are chemically modified with at least one of an epoxy group-modified silicone compound and an epoxy group-containing long-chain alkyl compound, as the epoxy group reacts with the acidic group.