Resin composition, coating composition, and coated article

Patent metadata

Field	Value
Publication number	US-11639423-B2
Application number	US-202016878739-A
Country	US
Kind code	B2
Filing date	May 20, 2020
Priority date	Dec 22, 2017
Publication date	May 2, 2023
Grant date	May 2, 2023

Abstract

Provided is a resin composition for producing a coating composition excellent in appearance, abrasion resistance, and hardness of a coating film. The resin composition of the present invention includes a compound A having a branched structure which has a terminal hydroxyl group, a polyisocyanate B, and an inorganic particle C, in which the inorganic particle C has a functional group enabling reacting with a hydroxyl group or an isocyanate group on a surface thereof.

First claim

The invention claimed is:

1. A resin composition comprising:
a compound A which is a hyperbranched polymer having a terminal hydroxyl group;
a polyisocyanate B; and
an inorganic particle C which is a silica particle having a mercapto group
enabling reacting with an isocyanate group on a surface thereof.

2. The resin composition according to claim 1 ,
wherein a content of the compound A in a total mass (100% by mass) of the compound A, the polyisocyanate B, and the inorganic particle C is 5% by mass to 50% by mass.

3. The resin composition according to claim 1 , wherein a weight average molecular weight of the hyperbranched polymer is 550 to 30,000.

4. The resin composition according to claim 1 , wherein the compound A has a hydroxyl value of 20 mg KOH/g to 1,000 mg KOH/g.

5. The resin composition according to claim 1 , wherein the polyisocyanate B is a trifunctional or higher functional isocyanate.

6. The resin composition according to claim 1 ,
wherein the inorganic particle C is a silica particle surface-treated with a silane coupling agent having a mercapto group enabling reacting with an isocyanate group.

7. The resin composition according to claim 1 ,
wherein a content of the inorganic particle C in the total mass (100% by mass) of the compound A, the polyisocyanate B, and the inorganic particle C is equal to or more than 1% by mass and less than 55% by mass.

8. The resin composition according to claim 1 , further comprising:
at least one ultraviolet absorbing agent selected from the group consisting of a triazine-based ultraviolet absorbing agent, a benzophenone-based ultraviolet absorbing agent, a benzotriazole-based ultraviolet absorbing agent, a phenyl salicylate-based ultraviolet absorbing agent, and a phenyl benzoate-based ultraviolet absorbing agent.

9. A coating composition comprising:
the resin composition according to claim 1 .

10. A coated article having a coating film formed of the coating composition according to claim 9 .

11. The resin composition according to claim 1 ,
wherein a content of the compound A is 5% by mass to 50% by mass, and a content of the inorganic particle C is equal to or more than 1% by mass and less than 55% by mass, in a total mass (100% by mass) of the compound A, the polyisocyanate B, and the inorganic particle C, and
a molar ratio of the isocyanate group of the polyisocyanate B to the terminal hydroxyl group of the compound A is from 0.5 to 2.0.

12. The resin composition according to claim 1 ,
wherein a content of the compound A is 5% by mass to 40% by mass, and a content of the inorganic particle C is 1% by mass to 10% by mass, in a total mass (100% by mass) of the compound A, the polyisocyanate B, and the inorganic particle C.

13. The resin composition according to claim 12 , wherein a molar ratio of the isocyanate group of the polyisocyanate B to the terminal hydroxyl group of the compound A is from 0.7 to 1.8.

14. The resin composition according to claim 1 ,
wherein a content of the compound A is 5% by mass to 30% by mass, and a content of the inorganic particle C is 1% by mass to 10% by mass, in a total mass (100% by mass) of the compound A, the polyisocyanate B, and the inorganic particle C.

15. The resin composition according to claim 14 , wherein a molar ratio of the isocyanate group of the polyisocyanate B to the terminal hydroxyl group of the compound A is from 0.7 to 1.8.

16. The resin composition according to claim 1 , wherein inorganic particle C has an average particle diameter of 2 nm to 300 nm.

17. The resin composition according to claim 1 , wherein inorganic particle C has an average particle diameter of 4 nm to 50 nm.

18. The resin composition according to claim 3 ,
wherein a content of the compound A is 5% by mass to 30% by mass, and a content of the inorganic particle C is 1% by mass to 10% by mass, in a total mass (100% by mass) of the compound A, the polyisocyanate B, and the inorganic particle C, and
a molar ratio of the isocyanate group of the polyisocyanate B to the terminal hydroxyl group of the compound A is from 0.7 to 1.8.

19. The resin composition according to claim 4 ,
wherein a content of the compound A is 5% by mass to 30% by mass, and a content of the inorganic particle C is 1% by mass to 10% by mass, in a total mass (100% by mass) of the compound A, the polyisocyanate B, and the inorganic particle C, and
a molar ratio of the isocyanate group of the polyisocyanate B to the terminal hydroxyl group of the compound A is from 0.7 to 1.8.

20. The resin composition according to claim 5 ,
wherein a content of the compound A is 5% by mass to 30% by mass, and a content of the inorganic particle C is 1% by mass to 10% by mass, in a total mass (100% by mass) of the compound A, the polyisocyanate B, and the inorganic particle C, and
a molar ratio of the isocyanate group of the polyisocyanate B to the terminal hydroxyl group of the compound A is from 0.7 to 1.8.

Assignees

• Mitsubishi Chem Corp

Inventors

• Kanbara Riina
• Asai Takafumi
• Serizawa Masashi
• Mukuda Takahiro
• Kamon Yoshihiro

Classifications

• C08G18/4277

  Caprolactone and/or substituted caprolactone · CPC title

• C08G18/73

  acyclic · CPC title

• C09D201/005

  Dendritic macromolecules · CPC title

• C08K9/06

  with silicon-containing compounds · CPC title

• C08G18/4263

  containing carboxylic acid groups · CPC title