POLYESTER RESIN, METHOD FOR MANUFACTURING POLYESTER RESIN, AND COATING COMPOSITION CONTAINING POLYESTER RESIN

• US 20170037182A1
• Filed: 04/23/2015
• Published: 02/09/2017
• Est. Priority Date: 04/25/2014
• Status: Active Grant

• Current Assignee: Mitsubishi Chemical Corporation (Mitsubishi Chemical Group Corp.)
• Original Assignee: Mitsubishi Rayon Company Limited (Mitsubishi Chemical Holdings Corporation)
• Inventors: KONDO, Akifumi, TAMURA, Yoko, KIURA, Masaaki, KANEKO, Asako
• Granted Patent: US 10,093,771 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: C08G 63/183 Terephthalic acids
• CPC Class Codes: C08G 63/199 Acids or hydroxy compounds containing cycloaliphatic rings
• CPC Class Codes: C08G 63/20 Polyesters having been prepared in the presence of compounds having one reactive group or more than two reactive groups
• CPC Class Codes: C08G 63/668 derived from polycarboxylic acids and polyhydroxy compounds
• CPC Class Codes: C08G 63/672 Dicarboxylic acids and dihydroxy compounds
• CPC Class Codes: C08G 63/78 Preparation processes
• CPC Class Codes: C08L 67/00 Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain of polyester-amides C08L77/12; of polyester-imides C08L79/08; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 67/025 containing polyether sequences
• CPC Class Codes: C09D 167/00 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 Class Codes: C09D 167/02 Polyesters derived from dicarboxylic acids and dihydroxy compounds C09D167/06 takes precedence
• CPC Class Codes: C09D 167/025 containing polyether sequences

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.

Claims

1. A polyester resin, comprising:

a polycarboxylic acid-derived structural unit;

a trihydric or higher alcohol-derived structural unit; and

an isosorbide-derived structural unit,

wherein the polyester resin comprises 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 relative to 1 mol of the polycarboxylic acid-derived structural unit.

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

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

4. The polyester resin according to claim 1, further comprising a structural unit derived from a dihydric alcohol having an alicyclic skeleton, which is not isosorbide.

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

6. The polyester resin according to claim 4, wherein the polyester resin comprises 0.001 to 0.15 mol of the structural unit derived from the dihydric alcohol having an alicyclic skeleton relative to 1 mol of the polycarboxylic acid-derived structural unit.

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

C.

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

10. The polyester resin solution according to claim 9, wherein the solvent is an organic solvent.

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

12. The coating composition according to claim 11, wherein the coating composition comprises 5 to 60 mass % of the polyester resin relative to a total mass of the polyester resin solution.

8. A method for manufacturing a polyester resin, 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 and 0.015 to 0.4 mol of a trihydric or higher alcohol relative to 1 mol of the polycarboxylic acid component.