Copolymerized saturated polyester resin and coating composition containing same

Patent metadata

Field	Value
Publication number	US-12152103-B2
Application number	US-201916966966-A
Country	US
Kind code	B2
Filing date	Jan 31, 2019
Priority date	Feb 7, 2018
Publication date	Nov 26, 2024
Grant date	Nov 26, 2024

Abstract

The present invention relates to a copolymerized saturated polyester resin and a coating composition containing same. Provided are a copolymerized saturated polyester resin and a coating composition having excellent hot water resistance, chemical resistance and processability when formed into a coating film, and showing excellent adhesiveness to a metal base, and thus particularly useful for coating a can and pre-coated metal (PCM).

First claim

The invention claimed is:

1. A copolymerized saturated polyester resin, which is formed by polycondensation of an acid component and an alcohol component, and
has an intrinsic viscosity of 0.4 to 0.65 dl/g, a number average molecular weight of 12,000 to 20,000 g/mol, and a polydispersity index (PDI) of 3.0 to 5.0,
wherein the acid component comprises (a-1) 90 to 95% by mole of an aromatic dicarboxylic acid or a C 1-2 alkyl ester thereof and (a-2) 0.5 to 1.5% by mole of a trifunctional or higher functional carboxylic acid or an anhydride thereof,
wherein the alcohol component comprises (b-1) 20 to 55% by mole of an alicyclic polyhydric alcohol and (b-2) 45 to 80% by mole of an aliphatic polyhydric alcohol having a C 1-3 alkyl side chain, and
wherein the alicyclic polyhydric alcohol (b-1) is one or more selected from the group consisting of cyclohexane dimethanol, tricyclodecane dimethanol, and isosorbide.

2. The copolymerized saturated polyester resin of claim 1 , wherein the aromatic dicarboxylic acid or a C 1-2 alkyl ester thereof (a-1) is one or more selected from the group consisting of isophthalic acid, terephthalic acid, 2,6-naphthalene dicarboxylic acid, and C 1-2 alkyl esters thereof; and
the trifunctional or higher functional carboxylic acid or an anhydride thereof (a-2) is one or more selected from the group consisting of trimellitic acid and an anhydride thereof.

3. A coating composition, which comprises the copolymerized saturated polyester resin of claim 2 .

4. The coating composition of claim 3 , which further comprises a curing agent, wherein the curing agent is one or more selected from the group consisting of a phenol-formaldehyde resin, a polyfunctional polyisocyanate compound, a melamine-formaldehyde resin, a benzoguanamine resin, and combinations thereof.

5. The copolymerized saturated polyester resin of claim 1 , wherein the aliphatic polyhydric alcohol having a C 1-3 alkyl side chain (b-2) is one or more selected from the group consisting of 2,2-dimethyl-1,3-propanediol, 2-methyl-1,3-propanediol, 1,3-butanediol, and 1,2-propylene glycol.

6. A coating composition, which comprises the copolymerized saturated polyester resin of claim 5 .

7. The coating composition of claim 6 , which further comprises a curing agent, wherein the curing agent is one or more selected from the group consisting of a phenol-formaldehyde resin, a polyfunctional polyisocyanate compound, a melamine-formaldehyde resin, a benzoguanamine resin, and combinations thereof.

8. The copolymerized saturated polyester resin of claim 1 , wherein the acid component further comprises an aliphatic dicarboxylic acid in an amount of 0.1 to 9% by mole.

9. A coating composition, which comprises the copolymerized saturated polyester resin of claim 8 .

10. The coating composition of claim 9 , which further comprises a curing agent, wherein the curing agent is one or more selected from the group consisting of a phenol-formaldehyde resin, a polyfunctional polyisocyanate compound, a melamine-formaldehyde resin, a benzoguanamine resin, and combinations thereof.

11. The copolymerized saturated polyester resin of claim 1 , which has a glass transition temperature in the range of 40 to 80° C.

12. A coating composition, which comprises the copolymerized saturated polyester resin of claim 11 .

13. The coating composition of claim 12 , which further comprises a curing agent, wherein the curing agent is one or more selected from the group consisting of a phenol-formaldehyde resin, a polyfunctional polyisocyanate compound, a melamine-formaldehyde resin, a benzoguanamine resin, and combinations thereof.

14. A coating composition, which comprises the copolymerized saturated polyester resin of claim 1 .

15. The coating composition of claim 14 , which further comprises a curing agent, wherein the curing agent is one or more selected from the group consisting of a phenol-formaldehyde resin, a polyfunctional polyisocyanate compound, a melamine-formaldehyde resin, a benzoguanamine resin, and combinations thereof.

Assignees

• Sk Chemicals Co Ltd

Inventors

• Kim Hyung-Gon
• Sim Jong-Ki
• Kim Soon-Ki

Classifications

• C08G63/189

  containing a naphthalene ring · CPC title

• C09D7/63

  organic · CPC title

• C09D167/02

  Polyesters derived from dicarboxylic acids and dihydroxy compounds (C09D167/06 takes precedence) · 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

• C08G63/199

  Acids or hydroxy compounds containing cycloaliphatic rings · CPC title