Toner binder and toner

Patent metadata

Field	Value
Publication number	US-10459359-B2
Application number	US-201615778914-A
Country	US
Kind code	B2
Filing date	Nov 25, 2016
Priority date	Nov 27, 2015
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

An object of the present invention is to provide a toner binder and a toner that maintains offset resistance while having high gloss and that is excellent in low-temperature fixability, grindability, image strength, and heat-resistant storage stability. The toner binder of the present invention is a toner binder containing a non-linear polyester modified resin (A), wherein the non-linear polyester modified resin (A) is a modified resin having one or more carbon-carbon bonds crosslinking polyesters, and the toner binder has a loss tangent tan δ of 2 to 20 in the entire temperature range of 110° C. to 130° C.

First claim

The invention claimed is:

1. A toner binder comprising:
a non-linear polyester modified resin (A),
wherein the non-linear polyester modified resin (A) is a modified resin having one or more carbon-carbon bonds crosslinking polyesters,
wherein the toner binder has a loss tangent tan δ of 2 to 20 in the entire temperature range of 110° C. to 130° C.,
wherein the polyester comprises a polyester (A1) having carbon-carbon double bonds, and the polyester (A1) having carbon-carbon double bonds has a glass transition temperature Tg A1 of −35° C. to 43° C.

2. The toner binder according to claim 1 ,
wherein the polyester (A1) having carbon-carbon double bonds contains an unsaturated carboxylic acid component (y) and/or an unsaturated alcohol component (z) as a raw material.

3. The toner binder according to claim 1 ,
wherein the toner binder has a double bond equivalent of 0.50 mmol/g or less.

4. The toner binder according to claim 1 ,
wherein the polyester (A1) having carbon-carbon double bonds has a double bond equivalent of 0.02 to 2.00 mmol/g.

5. The toner binder according to claim 1 ,
wherein at least one of the carbon-carbon bonds is a carbon-carbon bond formed by mutually crosslinking carbon-carbon double bonds derived from the polyester (A1) having carbon-carbon double bonds.

6. The toner binder according to claim 1 ,
wherein the polyester (A1) having carbon-carbon double bonds has a peak top molecular weight Mp of 2,000 to 30,000.

7. The toner binder according to claim 1 , further comprising a polyester (B) containing a saturated carboxylic acid component and a saturated alcohol component as raw materials.

8. The toner binder according to claim 7 ,
wherein the polyester (A1) having carbon-carbon double bonds and the polyester (B) are contained at a weight ratio (A1)/(B) of 5/95 to 50/50.

9. The toner binder according to claim 7 ,
wherein the non-linear polyester modified resin (A) is a modified resin produced by mutually crosslinking carbon-carbon double bonds derived from the polyester (A1) having carbon-carbon double bonds in a state where the polyester (A1) having carbon-carbon double bonds and the polyester (B) are mixed together.

10. The toner binder according to claim 7 ,
wherein the non-linear polyester modified resin (A) is a modified resin produced by mutually crosslinking carbon-carbon double bonds derived from the polyester (A1) having carbon-carbon double bonds using a radical reaction initiator (c) in a state where the polyester (A1) having carbon-carbon double bonds and the polyester (B) are mixed together.

11. The toner binder according to claim 1 ,
wherein the toner binder has a storage modulus (G′) at 120° C. of 30 to 35,000 Pa and a loss modulus (G″) at 120° C. of 60 to 70,000 Pa.

12. The toner binder according to claim 1 , further comprising tetrahydrofuran (THF) insolubles,
wherein the amount of the tetrahydrofuran (THF) insolubles in the toner binder is 20% by weight or less.

13. The toner binder according to claim 1 , further comprising a crystalline resin (C) other than the polyester (A1) having carbon-carbon double bonds and a polyester (B) containing a saturated carboxylic acid component and a saturated alcohol component as raw materials.

14. The toner binder according to claim 1 ,
wherein the toner binder has at least one inflexion point indicating a glass transition temperature Tg T in a temperature range of −20° C. to 80° C. in a chart obtained by differential scanning calorimetry (DSC) using the toner binder.

15. A toner comprising:
the toner binder according to claim 1 ; and
a colorant.

Assignees

• Sanyo Chemical Ind Ltd

Inventors

• Izumi Tsuyoshi
• Honda Masaru

Classifications

• C08G63/12

  derived from polycarboxylic acids and polyhydroxy compounds · CPC title

• G03G9/08793

  Crosslinked polymers · CPC title

• C08G63/52

  Polycarboxylic acids or polyhydroxy compounds in which at least one of the two components contains aliphatic unsaturation · CPC title

• C08G63/676

  in which at least one of the two components contains aliphatic unsaturation · CPC title

• C08G63/21

  in the presence of unsaturated monocarboxylic acids or unsaturated monohydric alcohols or reactive derivatives thereof · CPC title