Polyester resin, toner containing polyester resin, and method for manufacturing polyester resin

Patent metadata

Field	Value
Publication number	US-2017192369-A1
Application number	US-201515314661-A
Country	US
Kind code	A1
Filing date	May 28, 2015
Priority date	May 30, 2014
Publication date	Jul 6, 2017
Grant date	—

Abstract

To provide a crosslinked polyester resin by using environmentally friendly and low-cost raw materials while reducing the content of a bisphenol A-derived component.
[Subject Matter]
[Solutions]
To provide a polyester resin containing a trivalent or higher acid-derived component and a bisphenol A-alkylene oxide adduct-derived component. In such a polyester resin, the bisphenol A-alkylene oxide adduct-derived component is contained at 0.01˜0.35 mol relative to 1 mol of all the acid-derived components, and the ratio of acid value (mg KOH/g) to hydroxyl value (mg KOH/g) is set to be 1:3˜1:26.

First claim

1 : A polyester resin, comprising:
a trivalent or higher acid-derived component; and a bisphenol A-alkylene oxide adduct-derived component, wherein a content of the bisphenol A-alkylene oxide adduct-derived component is set at 0.01 to 0.35 mol relative to 1 mol of all the acid-derived components, and a ratio of acid value (mg KOH/g) to hydroxyl value (mg KOH/g) is set to be from 1:3 to 1:26.

2 : The polyester resin according to claim 1 , wherein the content of trivalent or higher acid-derived component is set at 0.01 to 0.30 mol in 1 mol of all the acid-derived components.

3 : The polyester resin according to claim 1 , wherein a metal content derived from a polymerization catalyst is set at 20 ppm or lower.

4 : A toner, comprising the polyester resin according to claim 1 .

5 : A method for manufacturing a polyester resin, comprising:
polycondensing a monomer mixture comprising a polyhydric alcohol and a polycarboxylic acid, wherein the monomer mixture comprises a trivalent or higher acid component and 0.01 to 0.35 mol of a bisphenol A-alkylene oxide adduct relative to 1 mol of all the acid components, and a ratio of the number of carboxyl groups to the number of hydroxyl groups at the time of preparing the monomer mixture is set to be from 1:1.13 to 1:1.30.

6 : The method for manufacturing a polyester resin according to claim 5 , wherein a content of the trivalent or higher acid component is set at 0.01 to 0.30 mol in 1 mol of all the acid components.

7 : The method for manufacturing a polyester resin according to claim 5 , wherein polymerization is carried out by setting the amount of a polymerization catalyst at 20 ppm or lower.

8 : The polyester resin according to claim 2 , wherein the metal content derived from a polymerization catalyst is set at 20 ppm or lower.

9 : A toner, comprising the polyester resin according to claim 2 .

10 : A toner, comprising the polyester resin according to claim 3 .

11 : The method for manufacturing a polyester resin according to claim 6 , wherein polymerization is carried out by setting the amount of a polymerization catalyst at 20 ppm or lower.

Assignees

• Mitsubishi Rayon Co
• Mitsubishi Rayon Co

Inventors

• Tamura Yoko
• Ozawa Tadahiro
• Kondo Akifumi

Classifications

• G03G9/081 Primary

  by mixing the toner components in a liquefied state; melt kneading; reactive mixing · CPC title

• G03G9/08755

  Polyesters · CPC title

• G03G9/087

  Binders for toner particles · CPC title

• G03G15/0865

  Arrangements for supplying new developer · CPC title

• G03G9/08797

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