Treated substrate having hydrophilic region and water repellent region, and process for producing it
View Patent ↗A treated substrate having a hydrophilic region and a water repellent region, of which contrast is high on its surface; a process for producing a treated substrate, wherein the treated substrate can be produced with a low amount of light for a short time; wherein the water repellent region is made of a water repellent film formed by curing the composition (A) comprising a photopolymerization initiator and a compound (a) having at least one (meth)acryloyl group, and a water repellent moiety and having a film thickness of from 0.1 to 100 nm; the process uses a hydrophilic substrate or makes the surface thereof hydrophilic, then forms a film containing the composition (A) on the surface, then forms said water repellent film by irradiating light on a part of the film surface to cure the composition (A) and then removes an uncured composition (A) present thereon in order to expose the hydrophilic surface.
1. A treated substrate having a hydrophilic region and a water repellent region on a surface of a substrate, wherein the water repellent region comprises a water repellent film formed by curing the following composition (A) and having a film thickness of from 0.1 to 100 nm:
composition (A): a composition comprising a photopolymerization initiator; a compound (a) having at least one polymerizable functional group selected from the group consisting of an acryloyl group and a methacryloyl group, and a water repellent moiety; and a compound (b) having at least three polymerizable functional groups selected from the group consisting of an acryloyl group and a methacryloyl group, provided that the compound (b) may be the same as the compound (a) or a compound other than the compound (a).
2. The treated substrate according to claim 1 , wherein the compound (a) is a compound represented by the following formula (11), (12), (21) or (22):
where each of Q 1 and Q 2 which are independent of each other, is a monovalent organic group, Q 3 is an alkyl group having at least four carbon atoms, a monovalent organic group having the above alkyl group as a partial structure, a fluoroalkyl group having at least one carbon atom, which may contain an etheric oxygen atom, or a monovalent organic group having the above fluoroalkyl group as a partial structure, Q 4 is an alkylene group having at least four carbon atoms, a bivalent organic group having the above alkylene group as a partial structure, a fluoroalkylene group having at least two carbon atoms, which may contain an etheric oxygen atom, or a bivalent organic group having the above fluoroalkylene group as a partial structure, R 1 is a hydrogen atom or a methyl group, n is an integer of at least 0, and k is an integer of from 1 to 5.
3. The treated substrate according to claim 2 , wherein compound (a) is represented by formula (11).
4. The treated substrate according to claim 3 , wherein each of Q 1 and Q 2 is a methyl group.
5. The treated substrate according to claim 2 , wherein compound (a) is represented by formula (12).
6. The treated substrate according to claim 5 , wherein Q 3 is a group represented by R f1 —Y—, wherein R f1 is a C 1-12 perfluoroalkyl group, and Y is a bivalent coupling group containing no fluorine atom.
7. The treated substrate according to claim 2 , wherein compound (a) is represented by formula (21).
8. The treated substrate according to claim 7 , wherein Q 1 is a methyl group.
9. The treated substrate according to claim 2 , wherein compound (a) is represented by formula (22).
10. The treated substrate according to claim 1 , wherein the contact angle of the hydrophilic region to water is at most 50°, and the contact angle of the water repellent region to water is at least 80°.
11. The treated substrate according to claim 1 , wherein the hydrophilic region and the water repellent region have a predetermined pattern.
12. The treated substrate according to claim 1 , wherein the substrate is selected from the group consisting of glass, silicon, metal oxide and polyimide.