ANTIFOGGING ARTICLE AND MANUFACTURING METHOD THEREOF, BASE LAYER FORMING COMPOSITION, AND ARTICLE FOR TRANSPORTATION APPARATUS
An antifogging article having an antifogging film excellent in antifogging property and in durability, an article for transportation apparatus provided with the antifogging article, and a base layer forming composition with sufficiently long pot life used for obtaining the antifogging article are provided. An antifogging article has a substrate, and an antifogging film on the substrate having a base layer made of a base material with low water absorbing property, and a water absorbing layer made of a water absorbing material having a water absorbing property higher than that of the base material, and the base material is obtained by using a composition containing (A) a raw material component of a first cured resin, (B) a silane-based coupling agent having a functional group other than an amino group having reactivity with the (A) component and a hydrolyzable group, and (C) tetraalkoxysilane and/or a polymer thereof in a prescribed ratio.
1 . An antifogging article having a substrate and an antifogging film on a surface of at least a part of the substrate, wherein:
the antifogging film has, in order from the substrate side, a base layer made of a base material with low water absorbing property, and a water absorbing layer made of a water absorbing material having a water absorbing property higher than that of the base material; and
the base material is obtained by using a base layer forming composition comprising the following (A) to (C) components:
(A) 100 parts by mass of a raw material component of a first cured resin;
(B) 60 to 200 parts by mass of a silane-based coupling agent having a functional group other than an amino group having reactivity with the (A) component and a hydrolyzable group; and
(C) 15 to 50 parts by mass, by oxide conversion, of tetraalkoxysilane and/or a polymer thereof.
2 . The antifogging article according to claim 1 , wherein a saturated water absorption amount of the water absorbing material is 50 mg/cm 3 or more.
3 . The antifogging article according to claim 1 , wherein a saturated water absorption amount of the base material is 10 mg/cm 3 or less.
4 . The antifogging article according to claim 1 , wherein the silane-based coupling agent is at least one selected from compounds represented by the following general formula (1),
R 1 SiR 2 n X 1 3-n (1)
where R 1 indicates a monovalent organic group having 1 to 10 carbon atoms and an epoxy group, an acryloxy group, a methacryloxy group, a vinyl group, a mercapto group, an isocyanate group, an ureido group, or a chlorine atom at a terminal thereof, R 2 indicates a monovalent hydrocarbon group having 1 to 4 carbon atoms, n indicates an integer of 0 or 1, and X 1 indicates hydrolyzable groups which may be mutually the same or different, respectively.
5 . The antifogging article according to claim 1 , wherein the tetraalkoxysilane and/or the polymer thereof is at least one selected from the group consisting of tetramethoxysilane, tetraethoxysilane, methyl silicate having average degree of polymerization is 2 to 10, and ethyl silicate having average degree of polymerization is 2 to 10.
6 . The antifogging article according to claim 1 , wherein the first cured resin is a first cured epoxy resin, a first polyurethane resin, or a first cross-linked acrylic resin.
7 . The antifogging article according to claim 1 , wherein the first cured resin is a cured epoxy resin, the (A) component comprises a first polyepoxide component, and a first polyaddition type curing agent and/or a first catalyst type curing agent, and the functional group contained in the (B) component is an epoxy group and/or a group having reactivity with the epoxy group.
8 . The antifogging article according to claim 7 , wherein the first catalyst type curing agent comprises an imidazole compound, and the first polyaddition type curing agent comprises an acid anhydride.
9 . The antifogging article according to claim 1 , wherein the water absorbing material is obtained by using a water absorbing layer forming composition comprising a raw material component of a second cured resin selected from a second cured epoxy resin, a second polyurethane resin, and a second cross-linked acrylic resin.
10 . The antifogging article according to claim 9 , wherein the raw material component of the second cured epoxy resin comprises a second polyepoxide component, a second polyaddition type curing agent, and a second catalyst type curing agent.
11 . The antifogging article according to claim 1 , wherein a film thickness of the base layer is 1 to 8 μm, and a film thickness of the water absorbing layer is 5 to 30 μm.
12 . The antifogging article according to claim 1 , wherein the substrate is made of glass.
13 . An article for transportation apparatus, comprising the antifogging article according to claim 1 .
14 . A base layer forming composition for obtaining the antifogging article according to claim 1 , the base layer forming composition comprising: the (A) to (C) components; and a (D) solvent.
15 . A manufacturing method of the antifogging article according to claim 1 , the method comprising:
applying and curing the base layer forming composition on a substrate surface to form the base layer; and
forming the water absorbing layer made of the water absorbing material on a surface of the base layer.