Toner

Patent metadata

Field	Value
Publication number	US-9383668-B2
Application number	US-201414554802-A
Country	US
Kind code	B2
Filing date	Nov 26, 2014
Priority date	Nov 29, 2013
Publication date	Jul 5, 2016
Grant date	Jul 5, 2016

Abstract

The present invention relates to a toner including a toner particle containing a binder resin, wherein the binder resin contains a block polymer and a styrene-acrylic resin, the block polymer has a vinyl polymer segment and a polyester segment, the polyester segment has a branch structure and the block polymer has a melting point of 50° C. to 95° C.

First claim

What is claimed is:

1. A toner comprising a toner particle containing a binder resin, wherein
the binder resin contains a block polymer and a styrene-acrylic resin;
the block polymer has a vinyl polymer segment and a crystalline polyester segment;
the polyester segment is a segment produced by condensation polymerization of the following (I), (II) and (III):
(I) a dicarboxylic acid having carboxyl groups at both terminals of a linear alkane having 2 to 16 carbon atoms;
(II) a diol having hydroxy groups at both terminals of a linear alkane having 2 to 16 carbon atoms; and
(III) an alkane compound having 3 to 24 carbon atoms, or an alkyl ester, lactone or acid anhydride compound derived from the alkane compound;
the alkane compound is at least one compound selected from the group consisting of the following (a) to (f):
(a) a branch alkanedicarboxylic acid;
(b) a branch alkanediol;
(c) a branch alkane monohydroxy monocarboxylic acid;
(d) a linear alkanedicarboxylic acid at least one of carboxyl groups of which is linked to a moiety other than a terminal;
(e) a linear alkanediol at least one of hydroxy groups of which is linked to a moiety other than a terminal; and
(f) a linear alkane monohydroxy monocarboxylic acid at least one of carboxyl group and hydroxy group of which is linked to a moiety other than a terminal;
the block polymer has a melting point (Tm) of 50° C. to 95° C.; and
the binder resin contains the block polymer at 2.0% by mass to 50.0% by mass.

2. The toner according to claim 1 , wherein the block polymer has a half-width of an endothermic peak, derived from the block polymer, of 4.0° C. to 12.0° C. as observed in differential scanning calorimetric measurement.

3. The toner according to claim 1 , wherein the block polymer has a mass ratio between the vinyl polymer segment and the polyester segment ((mass of the vinyl polymer segment):(mass of the polyester segment)) of 30:70 to 80:20.

4. The toner according to claim 3 , wherein the block polymer has a mass ratio between the vinyl polymer segment and the polyester segment ((mass of the vinyl polymer segment):(mass of the polyester segment)) of 30:70 to 70:30.

5. The toner according to claim 1 , wherein the binder resin contains the block polymer at 6.0% by mass to 50.0% by mass.

6. The toner according to claim 1 , wherein the toner particle further contains a wax and satisfies the following formulae (1) and (2):
( SPB− 1.0)≦ SPC≦SPB   (1)

( SPW+ 0.4)≦ SPC   (2),

where SPB is an SP value of the styrene-acrylic resin; SPC is an SP value of the polyester segment of the block polymer and SPW is an SP value of the wax.

7. The toner according to claim 1 , wherein the vinyl polymer segment has a weight-average molecular weight (Mw) of 4000 to 15000.

8. The toner according to claim 1 , wherein the block polymer has a weight-average molecular weight (Mw) of 15000 to 40000.

9. The toner according to claim 1 , wherein the block polymer has a weight-average molecular weight (Mw) of 20000 to 40000.

10. The toner according to claim 1 , wherein the toner particle is produced by a suspension polymerization method.

Assignees

• Canon Kk

Inventors

• NOJI Shintaro
• Tanaka Masatake
• Isono Naoya
• Shimano Tsutomu
• Yoshida Yu

Classifications

• G03G9/08795

  characterised by their chemical properties, e.g. acidity, molecular weight, sensitivity to reactants · CPC title

• G03G9/08797

  characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature · CPC title

• G03G9/08711 Primary

  with esters of acrylic or methacrylic acid · CPC title

• G03G9/0804

  whereby the components are brought together in a liquid dispersing medium · CPC title

• G03G9/08755

  Polyesters · CPC title