Polyester resin, method for manufacturing polyester resin, and coating composition containing polyester resin

Patent metadata

Field	Value
Publication number	US-10093771-B2
Application number	US-201515305121-A
Country	US
Kind code	B2
Filing date	Apr 23, 2015
Priority date	Apr 25, 2014
Publication date	Oct 9, 2018
Grant date	Oct 9, 2018

Abstract

The present invention relates to a polyester resin with excellent solubility in generic solvents, especially with excellent solubility at a temperature of 0° C. or lower. According to the present invention, by using the polyester resin with excellent solubility in generic solvents, solubility at a lower temperature, especially the solubility at a temperature of 0° C. or lower, is enhanced, making it easier to prepare paints, coatings and the like. The polyester resin related to the present invention contains 0.05 to 0.5 mol of an isosorbide-derived structural unit and 0.015 to 0.4 mol of a trihydric or higher alcohol-derived structural unit relative to 1 mol of a polycarboxylic acid-derived structural unit.

First claim

What is claimed is:

1. A polyester resin, comprising:
a polycarboxylic acid-derived structural unit;
a trihydric or higher alcohol-derived structural unit;
an isosorbide-derived structural unit; and
a structural unit derived from a dihydric alcohol that is other than isosorbide and having an alicyclic skeleton,
wherein 0.05 to 0.5 mol of the isosorbide-derived structural unit and 0.015 to 0.4 mol of the trihydric or higher alcohol-derived structural unit are present relative to 1 mol of the polycarboxylic acid-derived structural unit, and
where the structural unit derived from the dihydric alcohol having an alicyclic skeleton is present at 0.001 to 0.15 mol relative to 1 mol of the polycarboxylic acid-derived structural unit.

2. The polyester resin according to claim 1 , wherein the trihydric or higher alcohol-derived structural unit is present at 0.015 to 0.2 mol relative to 1 mol of the polycarboxylic acid-derived structural unit.

3. The polyester resin according to claim 1 , wherein the isosorbide-derived structural unit is present at 0.05 to 0.4 mol relative to 1 mol of the polycarboxylic acid-derived structural unit.

4. The polyester resin according to claim 1 , wherein the dihydric alcohol having an alicyclic skeleton is 1,4-cyclohexanedimethanol.

5. The polyester resin according to claim 1 , wherein the glass transition temperature is 50 to 90° C.

6. A method for manufacturing the polyester resin according to claim 1 , comprising:
polycondensing a polycarboxylic acid component and a polyhydric alcohol component,
wherein the polyhydric alcohol component comprises 0.05 to 0.5 mol of isosorbide, 0.015 to 0.4 mol of a trihydric or higher alcohol and 0.001 to 0.15 mol of an alicyclic dihydric alcohol relative to 1 mol of the polycarboxylic acid component.

7. A polyester resin solution, comprising the polyester resin according to claim 1 and a solvent.

8. The polyester resin solution according to claim 7 , wherein the solvent is an organic solvent.

9. A coating composition, comprising the polyester resin solution according to claim 7 .

10. The coating composition according to claim 9 , wherein the polyester resin according to claim 1 is present at 5 to 60 mass % of the total mass of the polyester resin solution.

Assignees

• Mitsubishi Rayon Co
• Mitsubishi Chem Corp

Inventors

• Kondo Akifumi
• Tamura Yoko
• Kiura Masaaki
• Kaneko Asako

Classifications

• C08G63/672 Primary

  Dicarboxylic acids and dihydroxy compounds · CPC title

• C09D167/025

  containing polyether sequences · CPC title

• C09D167/00

  Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain (based on polyester-amides C09D177/12; based on polyester-imides C09D179/08); Coating compositions based on derivatives of such polymers · CPC title

• C08L67/025

  containing polyether sequences · CPC title

• C08G63/78

  Preparation processes · CPC title