Article having coating on substrate, coating composition, and coating method
View Patent ↗Provided is a coating technology additionally excellent in, for example, water repellency, oil repellency, and ease of dirt removal. An article having a coating on a substrate, in which the coating contains: (a) a polyhedral oligomeric silsesquioxane; and (b) an acrylate polymer having a structural unit represented by the following general formula (II): where Ra represents a hydrogen atom or a methyl group, Rf represents —CH 2 —(CF 2 ) q —CF 3 or —CH(CF 3 ) 2 , and q represents an integer of 0 to 8.
1. An article having a coating on a substrate, wherein the coating comprises:
(a) a polyhedral oligomeric silsesquioxane; and
(b) an acrylate polymer having a structural unit represented by the following general formula (II):
where Ra represents a hydrogen atom or a methyl group, Rf represents —CH 2 —(CF 2 ) q —CF 3 or —CH(CF 3 ) 2 , and q represents an integer of 0 to 8,
wherein the coating comprises the polyhedral oligomeric silsesquioxane at least in the following proportion X:
the proportion X refers to, in “profile where as the proportion of the polyhedral oligomeric silsesquioxane increases, a liquid droplet sliding angle on a surface of a coating film decreases or temporarily increases and then decreases, but a change in the decrease gradually becomes smailler,” a proportion at a starting point at which the change becomes smaller.
2. The article according to claim 1 , wherein the a polyhedral oligomeric silsesquioxane is represented by the following general formula (I);
where R represents —(CH 2 ) 2 —(CF 2 ) p —CF 3 , and p represents an integer of 0 to 9.
3. The article according to claim 1 , wherein the q represents an integer of 0 to 5.
4. The article according to claim 1 , wherein the coating has a surface arithmetic mean roughness of 2.5 nm or less.
5. The article according to claim 1 , wherein the coating has water repellency and oil repellency in which a sliding angle for linoleic acid is 4.0 degree or less and a sliding angle for pure water is 4.0 degrees or less.
6. The article according to claim 1 , wherein the article has a transmittance to light having a wavelength of 400 to 850 nm of 93% or more.
7. The article according to claim 1 , wherein the substrate has an optical power.
8. The article according to claim 1 , wherein the article is an ophthalmic lens.
9. A coating composition, comprising:
(a) a polyhedral oligomeric silsesquioxane represented by the general formula (I);
(b) an acrylate polymer having a structural unit represented by the general formula (II); and
(c) a solvent for dissolving the polyhedral oligomeric silsesquioxane and the acrylate polymer:
where R represents —(CH 2 ) 2 —(CF 2 ) p —CF 3 , and p represents an integer of 0 to 9;
where Ra represents a hydrogen atom or a methyl group, Rf represents —CH 2 —(CF 2 ) q —CF 3 or —CH(CF 3 ) 2 , and q represents an integer of 0 to 8,
wherein the coating comprises the polyhedral oligomeric silsesquioxane at least in the following proportion X:
the proportion X refers to, in “profile where as the proportion of the polyhedral oligomeric silsesquioxane increases, a liquid droplet sliding angle on a surface of a coating film decreases or temporarily increases and then decreases, but a change in the decrease gradually becomes smailler,” a proportion at a starting point at which the change becomes smaller.
10. The coating composition according to claim 9 , wherein the solvent comprises an organic compound containing at least one of chlorine and fluorine.
11. A method of manufacturing a coated article, comprising a coating step of applying the coating composition according to claim 9 to a surface of a substrate and removing the solvent.
12. A method of manufacturing a coated article according to claim 11 , wherein the coating step is carried out at a humidity of 30% RH or less.
13. The method of manufacturing a coated article according to claim 11 , wherein the coating step is carried out under a dehumidified atmosphere.