Ultraviolet-curable liquid developer

Patent metadata

Field	Value
Publication number	US-9891547-B2
Application number	US-201615166643-A
Country	US
Kind code	B2
Filing date	May 27, 2016
Priority date	May 27, 2015
Publication date	Feb 13, 2018
Grant date	Feb 13, 2018

Abstract

Provided is a ultraviolet-curable liquid developer containing a toner particle, a cationically polymerizable liquid monomer, and a photoinitiator that contains a compound according to formula (1):

The cationically polymerizable liquid monomer contains a vinyl ether compound satisfying A/B×1,000≧8.5, wherein A is the molar average number of functional groups for the vinyl ether compound and B is the molar average molecular weight of the vinyl ether compound.

First claim

What is claimed is:

1. An ultraviolet-curable liquid developer comprising;
a toner particle containing a binder resin and a colorant;
a cationically polymerizable liquid monomer that does not dissolve the binder resin in the toner particle; and
a photoinitiator, wherein
the cationically polymerizable liquid monomer contains a vinyl ether compound satisfying A/B×1,000≧8.5 where A is the molar average number of functional groups for the vinyl ether compound and B is the molar average molecular weight of the vinyl ether compound, A and B satisfy the relationship A/B×1,000≧8.5; and
the photoinitiator contains a compound represented by formula (1):

wherein R 1 and R 2 are bonded to each other to form a ring structure selected from the group consisting of a succinimide structure, a phthalimide structure, a norbornenedicarboximide structure, a naphthalenedicarboximide structure, a cyclohexanedicarboximide structure, and an epoxycyclohexenedicarboximide structure; x is an integer of 1 to 8; and y is an integer of 3 to 17.

2. The ultraviolet-curable liquid developer according to claim 1 , wherein A/B×1,000≧9.5.

3. The ultraviolet-curable liquid developer according to claim 1 , wherein the content of the compound represented by formula (1) is 0.05 to 1.00 mass part per 100 mass parts of the cationically polymerizable liquid monomer.

4. The ultraviolet-curable liquid developer according to claim 1 , wherein the compound represented by formula (1) is a compound represented by formula (2):

wherein x represents an integer of 1 to 8; y represents an integer of 3 to 17; R 3 and R 4 are independently selected from an alkyl group, alkyloxy group, alkylthio group, aryl group, aryloxy group, and arylthio group; o and p each independently represent an integer of 0 to 3 with the proviso that that when o is equal to or greater than 2, a plurality of R 3 may be bonded to each other to form a ring structure, and when p is equal to or greater than 2, a plurality of R 4 may be bonded to each other to form a ring structure; and an R 3 and R 4 may be bonded to each other to form a ring structure.

5. The ultraviolet-curable liquid developer according to claim 1 , further comprising a photopolymerization sensitizer that contains a thioxanthone-type compound or an anthracene-type compound.

6. The ultraviolet-curable liquid developer according to claim 5 , further comprising a photopolymerization sensitizing aid that contains a naphthalene-type compound.

Assignees

• Canon Kk

Inventors

• Tanabe Hiroshi
• Ito Junji
• Aichi Yasuhiro
• Sato Naotake

Classifications

• G03G9/12

  in liquid developer mixtures · CPC title

• G03G9/131 Primary

  obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• G03G9/125 Primary

  characterised by the liquid · CPC title