Polyurethane coating composition

Patent metadata

Field	Value
Publication number	US-10995236-B2
Application number	US-201615771228-A
Country	US
Kind code	B2
Filing date	Oct 24, 2016
Priority date	Oct 28, 2015
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

A coating composition, coated article and method for coating an article are provided. The composition is a coating composition that includes a polyurethane binder system further including a first resin component and a second resin component with a significant difference in hydroxyl numbers and crosslinked with an isocyanate. The composition, when applied to and cured on an article, imparts optimal antifingerprint, antireflecting, tactile, chemical agent-resistant, and self-healing effects to the coated article.

First claim

What is claimed is:

1. A coating composition, comprising:
a polyurethane binder resin system comprising:
a first resin component with a hydroxyl number of 150 to 240;
a second resin component with a hydroxyl number of 15 to 35,

wherein the difference in hydroxyl number of the first and second resin component is 135 to 215; and
a hydroxyl-reactive crosslinker,

wherein the coating composition is substantially free of filler, and
wherein a cured coating formed from the coating composition has oleophobic and hydrophobic properties, and has 60°-gloss of less than about 5.

2. The composition of claim 1 , wherein a cured coating formed from the composition has 20°-gloss of less than about 1.

3. The composition of claim 1 , wherein a cured coating formed from the coating composition has surface roughness (Rz) of about 10 to 30 μm.

4. The composition of claim 1 , wherein the first resin component is a hydroxyl-functional polyester.

5. The composition of claim 1 , wherein the second resin component is a hydroxyl-functional polyester.

6. The composition of claim 1 , wherein the hydroxyl-reactive crosslinker is an isocyanate.

7. The composition of claim 1 , wherein the hydroxyl-reactive crosslinker is a blocked isocyanate.

8. The composition of claim 1 , wherein the first resin component has Tg of about 40° C. to 70° C.

9. The composition of claim 1 , wherein the second resin component has Tg of about 40° C. to 70° C.

10. The composition of claim 1 , wherein the difference in Tg (ΔTg) of the first and second resin components is no more than 10° C.

11. The composition of claim 1 , wherein the crosslinker is present in NCO:OH ratio of 1:1.5 to 1:1.1.

12. The composition of claim 1 , wherein a cured coating formed from the composition has self-healing effect when an external thermal stimulus is applied.

13. The composition of claim 1 , wherein a cured coating formed from the composition has self-healing effect at ambient temperature.

14. The composition of claim 1 , wherein a cured coating formed from the composition has self-healing effect at temperatures of above 90° C.

15. A coating composition, comprising a polyurethane binder resin system comprising:
a first resin component with a hydroxyl number of 150 to 240;
a second resin component with a hydroxyl number of 15 to 35,
wherein the difference in hydroxyl number of the first and second resin component is 135 to 215;
a hydroxyl-reactive crosslinker, and
wherein a cured coating formed from the coating composition has oleophobic and hydrophobic properties, and has 60°-gloss of less than about 5, and
wherein the composition comprises less than 5 wt % filler, based on the total weight of the composition.

Assignees

• Swimc Llc

Inventors

• Mistry Jigar K
• Jadhav Niteen
• Krogh Ivanka

Classifications

• C09D5/1656

  characterised by the film-forming substance (C09D5/1637 takes precedence) · CPC title

• C09D5/03

  Powdery paints · CPC title

• C09D5/1681

  Antifouling coatings characterised by surface structure, e.g. for roughness effect giving superhydrophobic coatings or Lotus effect · CPC title

• C08G18/4202

  Two or more polyesters of different physical or chemical nature (C08G18/44 takes precedence) · CPC title

• C09D175/06 Primary

  from polyesters · CPC title