Anti-fogging article and anti-fogging agent composition
View Patent ↗To provide an anti-fogging article having excellent anti-fogging performance and further having excellent durability, and an anti-fogging agent composition. An anti-fogging article comprising a substrate and a water-absorptive crosslinked resin layer formed on the surface of the substrate, wherein the water-absorptive crosslinked resin is a crosslinked resin with a saturated water absorption of at least 45 mg/cm 3 , or a water-absorptive crosslinked resin with a glass transition point of at least 50° C. as measured by a differential scanning calorimeter and further with a saturated water absorption of at least 45 mg/cm 3 .
1. An anti-fogging article comprising a substrate and a water-absorptive crosslinked resin layer formed on the surface of the substrate, wherein the water-absorptive crosslinked resin is a crosslinked resin with a saturated water absorption of at least 45 mg/cm 3 , and which water-absorptive crosslinked resin is a resin obtainable by reacting a polyglycidyl ether compound, a curing agent and a coupling agent,
wherein the polyglycidyl ether compound is at least one member selected from the group consisting of glycerol polyglycidyl ether, diglycerol polyglycidyl ether, polyglycerol polyglycidyl ethers and sorbitol polyglycidyl ether, and
wherein the curing agent is curing agent (A) or curing agent (B),
when the curing agent is curing agent (A), which is a compound having at least two reactive groups capable of reacting with an epoxy group in the polyglycidyl ether compound, the polyglycidyl ether compound is present in an amount of from 40 to 80 mass % based on the total of the polyglycidyl ether compound, the curing agent and the coupling agent, and
when the curing agent is curing agent (B), which is a compound to accelerate formation of the crosslinked resin by catalyzing a crosslinking reaction of the polyglycidyl ether compound, the polyglycidyl ether compound is present in an amount of from 60 to 95 mass % based on the total of the polyglycidyl ether compound, the curing agent and the coupling agent,
wherein the water-absorptive crosslinked resin layer has a thickness of from 5 to 30 μm, and
wherein the substrate comprises glass.
2. The anti-fogging article according to claim 1 , wherein the curing agent is curing agent (A), and curing agent (A) is at least one member selected from the group consisting of a polyol compound and a polycarboxylic acid anhydride.
3. The anti-fogging article according to claim 1 , wherein curing agent (A) is present and is a polyamine compound.
4. The anti-fogging article according to claim 3 , wherein the polyamine compound is ethylenediamine, triethylenetetramine, tetraethylenepentamine, hexamethylenediamine, isophoronediamine, mensenediamine, metaphenylenediamine, polyoxypropylenepolyamine, polyoxy glycol polyamine or 3,9-bis(3-aminopropyl)-2,4,8,10-tetraoxaspiro(5,5)undecane.
5. The anti-fogging article according to claim 1 , wherein the curing agent is curing agent (B) and curing agent (B) is a dicyanediimide, an organic acid dihydrazide, a tris(dimethylaminomethyl)phenol, a dimethylbenzylamine, a phosphine, an imidazole, an aryldiazonium salt or an arylsulfonium salt.
6. The anti-fogging article according to claim 5 , wherein curing agent (B) is a tris(dimethylaminomethyl)phenol, a phosphine or an arylsulfonium salt.
7. The anti-fogging article according to claim 1 , wherein the water-absorptive crosslinked resin has a water contact angle of its surface of at least 30°.
8. The anti-fogging article according to claim 1 , wherein the water-absorptive crosslinked resin has a glass transition point of at least 50° C. as measured by a differential scanning calorimeter.
9. The anti-fogging article according to claim 1 , wherein the water-absorptive crosslinked resin has a water contact angle of its surface of at least 30° and a saturated water absorption of at least 60 mg/cm 3 .
10. The anti-fogging article according to claim 1 , wherein the water-absorptive crosslinked resin layer is a resin layer formed by applying a liquid composition comprising a polyglycidyl ether compound, a curing agent and a solvent on the surface of the substrate, followed by drying and reacting.
11. The anti-fogging article according to claim 1 , which further comprises a hydrophobic layer on the surface of the crosslinked resin layer.
12. The anti-fogging article according to claim 1 , wherein the saturated water absorption is at least 60 mg/cm 3 .
13. The anti-fogging article according to claim 1 , wherein the saturated water absorption is from 75 to 185 mg/cm 3 .
14. The anti-fogging article according to claim 1 , wherein the saturated water absorption is from 90 to 155 mg/cm 3 .
15. The anti-fogging article according to claim 1 , wherein the crosslinked resin has a glass transition point is at least 90° C.
16. The anti-fogging article according to claim 1 , wherein the crosslinked resin has a glass transition point ranges from 50° C. to 200° C.