JP2010047739A - Hydrophilic composition, and hydrophilic member using the same, heat exchanger, air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydrophilic composition excellent in stability overtime, a hydrophilic member excellent in hydrophilicity and having a film which is formed using the composition, a hydrophilic member excellent in adhesion of a base material to the film, and a heat exchanger and an air conditioner using the hydrophilic member. <P>SOLUTION: This hydrophilic composition includes a hydrophilic polymer having a specific structure, with a pH not higher than 7, and the content of the reactive group of the hydrophilic polymer is not lower than 1.20 mass% to the total solid content. and the hydrophilic composition is used in these hydrophilic member, heat exchanger, and air conditioner. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hydrophilic composition, and a hydrophilic member, a heat exchanger, and an air conditioner using the hydrophilic composition.

Various hydrophilic compositions for forming films with excellent hydrophilicity on the surfaces of various substrates have been proposed. For example, Patent Document 1 discloses that a hydrophilic polymer having a silane coupling group at the end of the main chain and a high hydrophilicity due to a crosslinked structure formed by hydrolysis and condensation polymerization of a metal alkoxide selected from Si, Ti, Zr, and Al. A hydrophilic layer having a high strength is described.
Patent Document 2 describes that a corrosion resistance can be improved by forming a hydrophilic film on a fin included in a heat exchanger with a hydrophilic composition containing a hydrophilic polymer and a metal alkoxide.
On the other hand, a composition containing a metal alkoxide has a problem that white turbidity occurs when stored for a certain period. In order to solve this problem, Patent Document 3 describes that acetylacetone is added, Patent Document 4 describes that the solution temperature is adjusted, and Patent Document 5 describes that a polydentate ligand is added. ing.

JP 2002-361800 A JP 2007-225174 A JP-A-8-325036 JP 2000-351610 A Japanese Patent Laid-Open No. 2006-10956

However, in the prior art, the cloudiness and gelation when a hydrophilic composition containing a hydrophilic polymer containing a reactive group is stored for a certain period of time have not been studied, and improvement has been demanded. There has also been a demand for improvements in the hydrophilicity of a film formed using a hydrophilic composition stored for a certain period of time and the adhesion of the film to a substrate.
The objective of this invention is providing the hydrophilic member which uses the hydrophilic composition which solves the said subject, and this hydrophilic composition.

The above-described problems have been solved by the following means.
1. pH is 7 or less, and contains at least one selected from a hydrophilic polymer having a structure represented by the following general formula (I) and a hydrophilic polymer having a structure represented by the following general formula (II). A hydrophilic composition comprising 1.2% by mass or more of the reactive group represented by X in the general formula (I) and the following general formula (II) with respect to the total solid content.

In the general formulas (I) and (II), R ¹ , R ² , R ³ , R ⁴ , R ⁵ and R ⁶ each independently represents a hydrogen atom or a hydrocarbon group, X represents a reactive group, A , L ¹ , L ² and L ³ each independently represents a single bond or a linking group, and Y represents —NHCOR, —NHCO ₂ R, —NHCONR ₂ , —CONH ₂ , —NR ₂ , —CONR ₂ , —OCONR _2. , —COR, —OH, —OR, —OM, —CO ₂ M, —CO ₂ R, —SO ₃ M, —OSO ₃ M, —SO ₂ R, —NHSO ₂ R, —SO ₂ NR ₂ , — PO ₃ M, —OPO ₃ M, — (CH ₂ CH ₂ O) _n H, — (CH ₂ CH ₂ O) _n CH ₃ or —NR ₃ Z ¹ , where R is a hydrogen atom, an alkyl group Represents an aryl group or an aralkyl group, and when there are a plurality thereof, they may be the same or different from each other Ku, M represents a hydrogen atom, an alkyl group, an alkali metal, alkaline earth metal or an onium, n represents an integer, Z ¹ represents a halogen ion.
2. 2. The hydrophilic composition as described in 1 above, wherein the reactive group represented by X is contained in an amount of 1.2 to 11.9% by mass based on the total solid content.
3. 3. The hydrophilic composition as described in 1 or 2 above, wherein the pH is in the range of 3-7.
4). Solid content concentration is 1-8 mass%, The hydrophilic composition in any one of said 1-3 characterized by the above-mentioned.
5). The hydrophilic composition as described in any one of 1 to 4 above, wherein the X contains a silane coupling group.
6). The hydrophilic composition according to claim 1, wherein the reactive group represented by X is 6.8 to 11.9% by mass based on the total solid content.
7). Any one of 1 to 6 above, comprising both a hydrophilic polymer comprising a structure represented by the general formula (I) and a hydrophilic polymer comprising a structure represented by the general formula (II) The hydrophilic composition as described in 1.
8). The hydrophilic polymer containing the structure represented by the general formula (I) and the hydrophilic polymer containing the structure represented by the general formula (II) are within a range of 50/50 to 5/95 by mass ratio. 8. The hydrophilic composition as described in 7 above, which is contained in a proportion.
9. The hydrophilic member which has the hydrophilic film | membrane formed using the hydrophilic composition in any one of said 1-8 on the surface of a base material.
10. A heat exchanger having fins, wherein the hydrophilic member according to 9 is used as a material for forming the fins.
11. An air conditioner using the heat exchanger as described in 10 above.

  According to the present invention, it is possible to provide a hydrophilic composition that does not cause white turbidity or gelation when stored for a certain period of time, that is, has excellent temporal stability. Further, the hydrophilic composition of the present invention is excellent in hydrophilicity and adhesion to a substrate even after being stored for a certain period of time.

  The hydrophilic composition of the present invention has a pH of 7 or less, a hydrophilic polymer having a structure represented by the following general formula (I), and a hydrophilic polymer having a structure represented by the following general formula (II) It contains at least one selected, and contains a reactive group represented by X in the following general formula (I) and the following general formula (II) in an amount of 1.20% by mass or more based on the total solid content.

一般式（Ｉ）および（ＩＩ）中、Ｒ¹、Ｒ²、Ｒ³、Ｒ⁴、Ｒ⁵およびＲ⁶はそれぞれ独立に水素原子または炭化水素基を表し、Ｘは反応性基を表し、Ａ、Ｌ¹、Ｌ²およびＬ³はそれぞれ独立に単結合または連結基を表し、Ｙは−ＮＨＣＯＲ、−ＮＨＣＯ₂Ｒ、−ＮＨＣＯＮＲ₂、−ＣＯＮＨ₂、−ＮＲ₂、−ＣＯＮＲ₂、−ＯＣＯＮＲ₂、−ＣＯＲ、−ＯＨ、−ＯＲ、−ＯＭ、−ＣＯ₂Ｍ、−ＣＯ₂Ｒ、−ＳＯ₃Ｍ、−ＯＳＯ₃Ｍ、−ＳＯ₂Ｒ、−ＮＨＳＯ₂Ｒ、−ＳＯ₂ＮＲ₂、−ＰＯ₃Ｍ、−ＯＰＯ₃Ｍ、−（ＣＨ_２ＣＨ_２Ｏ）_ｎＨ、−（ＣＨ_２ＣＨ_２Ｏ）_ｎＣＨ_３または−ＮＲ₃Ｚ¹を表し、ここで、Ｒは水素原子、アルキル基、アリール基、またはアラルキル基を表し、複数存在する場合は互いに同一でも異なっていてもよく、Ｍは水素原子、アルキル基、アルカリ金属、アルカリ土類金属またはオニウムを表し、ｎは整数を表し、Ｚ¹はハロゲンイオンを表す。

In the general formulas (I) and (II), R ¹ , R ² , R ³ , R ⁴ , R ⁵ and R ⁶ each independently represents a hydrogen atom or a hydrocarbon group, X represents a reactive group, A , L ¹ , L ² and L ³ each independently represents a single bond or a linking group, and Y represents —NHCOR, —NHCO ₂ R, —NHCONR ₂ , —CONH ₂ , —NR ₂ , —CONR ₂ , —OCONR _2. , —COR, —OH, —OR, —OM, —CO ₂ M, —CO ₂ R, —SO ₃ M, —OSO ₃ M, —SO ₂ R, —NHSO ₂ R, —SO ₂ NR ₂ , — PO ₃ M, —OPO ₃ M, — (CH ₂ CH ₂ O) _n H, — (CH ₂ CH ₂ O) _n CH ₃ or —NR ₃ Z ¹ , where R is a hydrogen atom, an alkyl group Represents an aryl group or an aralkyl group, and when there are a plurality thereof, they may be the same or different from each other Ku, M represents a hydrogen atom, an alkyl group, an alkali metal, alkaline earth metal or an onium, n represents an integer, Z ¹ represents a halogen ion.

[Hydrophilic polymer]
The main chain structure of the hydrophilic polymer having the structure represented by the general formula (I) and the hydrophilic polymer having the structure represented by the general formula (II) is not particularly limited. Preferred main chain structures include acrylic resin, methacrylic resin, polyvinyl acetal resin, polyurethane resin, polyurea resin, polyimide resin, polyamide resin, epoxy resin, polystyrene resin, novolac type phenol resin, polyester resin, synthetic rubber, natural rubber, etc. An acrylic resin and a methacrylic resin are particularly preferable. The hydrophilic polymer may be a copolymer, and the copolymer may be any of a random copolymer, a block copolymer, and a graft copolymer.

  In the general formulas (I) and (II), X represents a reactive group. Examples of the reactive group include an alkoxide (also referred to as a metal alkoxide) containing an element selected from Si, Ti, Zr, and Al described later. A group that generates a bond by the action of a catalyst is preferable. Specifically, silane coupling group, carboxyl group, alkali metal salt of carboxy group, carboxylic anhydride group, amino group, hydroxy group, epoxy group, methylol group, mercapto group, isocyanate group, block isocyanate group, alkoxy Examples include silyl groups, alkoxy titanate groups, alkoxy aluminate groups, alkoxy zirconate groups, ethylenically unsaturated groups, ester groups, and tetrazole groups.

  The reactive group is preferably capable of forming a chemical bond by reacting with a metal alkoxide hydrolysis and polycondensate described later. Moreover, reactive groups may form a chemical bond. The hydrophilic polymer is preferably water-soluble, and preferably becomes water-insoluble by reacting with a hydrolysis or polycondensate of a metal alkoxide. The chemical bond in this case includes a covalent bond, an ionic bond, a coordination bond, and a hydrogen bond in the same manner as usual. The chemical bond is preferably a covalent bond.

X is preferably a silane coupling group, specifically a hydrolyzable silyl group represented by the following general formula (a).
Formula (a): —Si (R ¹⁰² ) _a (OR ¹⁰¹ ) _3-a
In general formula (a), R ¹⁰¹ is a hydrogen atom or an alkyl group, R ¹⁰² is a monovalent hydrocarbon group selected from a hydrogen atom or an alkyl group, an aryl group and an aralkyl group, and a is an integer of 0 to 2. . When a plurality of R ¹⁰¹ or R ¹⁰² are present, they may be the same as or different from each other.

When R ¹⁰¹ represents an alkyl group, an alkyl group having 1 to 10 carbon atoms is preferable, and specifically, a methyl group, an ethyl group, or the like is preferable.
When R ¹⁰² represents an alkyl group, an alkyl group having 1 to 10 carbon atoms is preferable. Specifically, a methyl group, an ethyl group, a hexyl group, or the like is preferable, and when R ¹⁰² represents an aryl group, an aryl group having 6 to 25 carbon atoms is preferable. Group, specifically, a phenyl group or the like is preferable. When an aralkyl group is represented, an aralkyl group having 7 to 12 carbon atoms is preferable, and specifically, a styryl group is preferable.

The reactive group is preferably a reactive group bonded to a carbon atom.
When two or more reactive groups are included, the two or more reactive groups may be the same as or different from each other.

The hydrophilic composition of the present invention contains 1.2% by mass or more of the reactive group represented by X, preferably 1.2 to 11.9% by mass, more preferably 6. It contains 8 to 11.9% by mass, more preferably 6.8 to 11.3% by mass.
When the content of X is less than 1.2% by mass, it is not preferable because the adhesion between the coating film and the substrate is insufficient.
When the content of X is 6.8 to 11.3 mass%, it is possible to obtain extremely excellent performance that satisfies all of the liquid aging stability, the hydrophilicity of the coating film, and the adhesion between the coating film and the substrate.
Here, content of X can be calculated | required by the mass% of the reactive group in solid content in a composition.

(Hydrophilic polymer having a structure represented by the general formula (I))
The hydrophilic polymer having a structure represented by the general formula (I) is, for example, a chain transfer agent (described in radical polymerization handbook (NTS, Mikiharu Tsunoike, Takeshi Endo)) or Iniferter (Macromolecules 1986, 19, p287). -(Described in (Otsu)) in the presence of a hydrophilic monomer (eg, acrylamide, acrylic acid, potassium salt of 3-sulfopropyl methacrylate) by radical polymerization. Examples of chain transfer agents include 3-mercaptopropionic acid, 2-aminoethanethiol hydrochloride, 3-mercaptopropanol, 2-hydroxyethyl disulfide, 3-mercaptopropyltrimethoxysilane. Alternatively, a hydrophilic monomer (eg, acrylamide) may be radically polymerized using a radical polymerization initiator having a reactive group without using a chain transfer agent.

The hydrophilic polymer having the structure represented by the general formula (I) is a hydrophilic polymer having a reactive group at the terminal. In the general formula (I), R ¹ and R ² each independently represents a hydrogen atom or a hydrocarbon group. Examples of the hydrocarbon group include an alkyl group and an aryl group, and a linear, branched or cyclic alkyl group having 1 to 8 carbon atoms is preferable. Specifically, methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, isopropyl group, isobutyl group, s-butyl group, t-butyl group, isopentyl group, neopentyl group 1-methylbutyl group, isohexyl group, 2-ethylhexyl group, 2-methylhexyl group, cyclopentyl group and the like. R ¹ and R ² are preferably a hydrogen atom, a methyl group or an ethyl group from the viewpoints of effects and availability.

  These hydrocarbon groups may further have a substituent. When the alkyl group has a substituent, the substituted alkyl group is constituted by a bond between a substituent and an alkylene group, and a monovalent nonmetallic atomic group excluding hydrogen is used as the substituent. Preferred examples include halogen atoms (—F, —Br, —Cl, —I), hydroxyl groups, alkoxy groups, aryloxy groups, alkylthio groups, arylthio groups, amino groups, N-alkylamino groups, N, N-dialkyls. Amino group, acyloxy group, N-alkylcarbamoyloxy group, N-arylcarbamoyloxy group, acylamino group, formyl group, acyl group, carboxyl group, alkoxycarbonyl group, aryloxycarbonyl group, carbamoyl group, N-alkylcarbamoyl group N, N-dialkylcarbamoyl group, N-arylcarbamoyl group, N-alkyl-N-arylcarbamoyl group, sulfo group, sulfonate group, sulfamoyl group, N-alkylsulfamoyl group, N, N-dialkylsulfamoyl group Group, N-arylsulfamo Group, N-alkyl-N-arylsulfamoyl group, phosphono group, phosphonate group, dialkyl phosphono group, diaryl phosphono group, monoalkyl phosphono group, alkyl phosphonate group, monoaryl phosphono group, aryl phosphine group Examples include an onato group, a phosphonooxy group, a phosphonateoxy group, an aryl group, and an alkenyl group.

  On the other hand, examples of the alkylene group in the substituted alkyl group include a divalent organic residue obtained by removing any one of the hydrogen atoms on the alkyl group having 1 to 8 carbon atoms. Can include linear alkylene groups having 1 to 12 carbon atoms, branched chains having 3 to 12 carbon atoms, and cyclic alkylene groups having 5 to 10 carbon atoms. Preferable specific examples of the substituted alkyl group obtained by combining the substituent and the alkylene group include a hydroxymethyl group, a chloromethyl group, a bromomethyl group, a 2-chloroethyl group, a trifluoromethyl group, a methoxymethyl group, and a methoxyethoxy group. Ethyl group, allyloxymethyl group, phenoxymethyl group, methylthiomethyl, tolylthiomethyl group, ethylaminoethyl group, diethylaminopropyl group, morpholinopropyl group, acetyloxymethyl group, benzoyloxymethyl group, N-cyclohexylcarbamoyloxyethyl Group, N-phenylcarbamoyloxyethyl group, acetylaminoethyl group, N-methylbenzoylaminopropyl group, 2-oxyethyl group, 2-oxypropyl group, carboxypropyl group, methoxycarbonyl group Group, allyloxycarbonyl butyl group,

Chlorophenoxycarbonylmethyl group, carbamoylmethyl group, N-methylcarbamoylethyl group, N, N-dipropylcarbamoylmethyl group, N- (methoxyphenyl) carbamoylethyl group, N-methyl-N- (sulfophenyl) carbamoylmethyl group , Sulfobutyl group, sulfonatobutyl group, sulfamoylbutyl group, N-ethylsulfamoylmethyl group, N, N-dipropylsulfamoylpropyl group, N-tolylsulfamoylpropyl group, N-methyl-N- (phos Phonophenyl) sulfamoyloctyl group, phosphonobutyl group, phosphonatohexyl group, diethylphosphonobutyl group, diphenylphosphonopropyl group, methylphosphonobutyl group, methylphosphonatobutyl group, tolylphosphonohexyl group, tolylphos Onatohexyl group, phosphonooxypropyl group, phosphonatoxybutyl group, benzyl group, phenethyl group, α-methylbenzyl group, 1-methyl-1-phenylethyl group, p-methylbenzyl group, cinnamyl group, allyl group, 1 -Propenylmethyl group, 2-butenyl group, 2-methylallyl group, 2-methylpropenylmethyl group, 2-propynyl group, 2-butynyl group, 3-butynyl group and the like can be mentioned.

  Of these, a hydroxymethyl group is preferred from the viewpoint of hydrophilicity.

A and L ^{1 each} represents a single bond or an organic linking group. Here, when A and L ¹ represent an organic linking group, A and L ¹ represent a polyvalent linking group composed of a nonmetallic atom, preferably 0 to 60 carbon atoms, 0 to 10 It consists of up to 50 nitrogen atoms, 0 to 50 oxygen atoms, 0 to 100 hydrogen atoms, and 0 to 20 sulfur atoms. Specifically, it is preferably selected from -N <, an aliphatic group, an aromatic group, a heterocyclic group, and combinations thereof, -O-, -S-, -CO-, -NH-, or A combination containing —O— or —S— or —CO— or —NH— is preferably a divalent linking group.
More specific examples of the linking group include the following structural units or those formed by combining them.

A and L ¹ are more preferably —CH ₂ CH ₂ CH ₂ S—, —CH ₂ S—, —CONHCH (CH ₃ ) CH ₂ —, —CONH—, —CO—, —CO ₂ —, — CH ₂ - is.

A and L ¹ may be formed of a polymer or an oligomer, and specifically include those containing polyacrylate, polymethacrylate, polyacrylonitrile, polyvinyl, polystyrene, etc. composed of unsaturated double bond monomers. . Other examples include poly (oxyalkylene), polyurethane, polyurea, polyester, polyamide, polyimide, polycarbonate, polyamino acid, polysiloxane, and the like, preferably polyacrylate, polymethacrylate, polyacrylonitrile, polyvinyl, and polystyrene. More preferred are polyacrylates and polymethacrylates.
The structural unit used for these polymers and oligomers may be one type or two or more types. When A and L ¹ are polymers or oligomers, the number of constituent elements is not particularly limited, and the molecular weight is preferably 1,000 to 1,000,000, more preferably 1,000 to 500,000, 000 to 200,000 is most preferred.

In general formula (I), Y represents —NHCOR, —NHCO ₂ R, —NHCONR ₂ , —CONH ₂ , —NR ₂ , —CONR ₂ , —OCONR ₂ , —COR, —OH, —OR, —OM, — CO ₂ M, —CO ₂ R, —SO ₃ M, —OSO ₃ M, —SO ₂ R, —NHSO ₂ R, —SO ₂ NR ₂ , —PO ₃ M, —OPO ₃ M, — (CH ₂ CH ₂ O) _n H, — (CH ₂ CH ₂ O) _n CH ₃ or —N (R) ₃ Z ¹ , wherein R is a hydrogen atom, an alkyl group (preferably a linear, branched or branched group having 1 to 18 carbon atoms). A cyclic alkyl group), an aryl group, or an aralkyl group, and when there are a plurality thereof, they may be the same or different from each other, M represents a hydrogen atom, an alkyl group, an alkali metal, an alkaline earth metal, or onium, n represents an integer, Z ¹ represents a halogen ion
Moreover, when it has several R like -CON (R) ₂ , R may couple | bond together and it may form the ring and the formed ring is oxygen atom, a sulfur atom, a nitrogen atom, etc. It may be a heterocycle containing a heteroatom. R may further have a substituent, and examples of the substituent that can be introduced here include the same substituents that can be introduced when R ¹ and R ² are alkyl groups. it can.

  Specific examples of R include methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, isopropyl, isobutyl, s-butyl, t-butyl, and isopentyl. Preferred examples include a group, neopentyl group, 1-methylbutyl group, isohexyl group, 2-ethylhexyl group, 2-methylhexyl group, cyclopentyl group and the like. Examples of M include a hydrogen atom; an alkali metal such as lithium, sodium and potassium; an alkaline earth metal such as calcium and barium; or an onium such as ammonium, iodonium and sulfonium.

The Y, _{specifically, -NHCOCH 3, -CONH 2, -CON} (CH 3) 2, -COOH, -SO 3 - NMe 4 +, -SO 3 - K +, - (CH 2 CH 2 O _N H, morpholyl group and the like are preferable. More _{preferably, -NHCOCH 3, -CONH 2, -CON} (CH 3) 2, -SO 3 - K +, - (CH 2 CH 2 O) n H, is.

  n preferably represents an integer of 1 to 100.

  The hydrophilic polymer having the structure represented by the general formula (I) is, for example, a chain capable of radical polymerization represented by the following general formula (i) and radical polymerization represented by the following general formula (ii). It can be synthesized by radical polymerization using a silane coupling agent having mobility. Since the silane coupling agent (ii) has chain transfer ability, it is possible to synthesize a polymer in which a silane coupling group is introduced at the end of the polymer main chain in radical polymerization.

In the above formulas (i) and (ii), A, R ^{1 to} R ² , L ¹ , X and Y have the same meanings as those in the above general formula (I). These compounds are commercially available and can also be easily synthesized. The radically polymerizable monomer represented by the general formula (i) has a hydrophilic group Y, and this monomer becomes one structural unit in the hydrophilic polymer.

  The hydrophilic polymer containing the structure represented by the general formula (I) may be a copolymer with another monomer. Examples of other monomers used include acrylic esters, methacrylic esters, acrylamides, methacrylamides, vinyl esters, styrenes, acrylic acid, methacrylic acid, acrylonitrile, maleic anhydride, maleic imide, etc. These known monomers are also included. By copolymerizing such monomers, various physical properties such as film forming property, film strength, hydrophilicity, hydrophobicity, solubility, reactivity, and stability can be improved.

  Specific examples of acrylic esters include methyl acrylate, ethyl acrylate, (n- or i-) propyl acrylate, (n-, i-, sec- or t-) butyl acrylate, amyl acrylate, 2-ethylhexyl acrylate, Dodecyl acrylate, chloroethyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxypentyl acrylate, cyclohexyl acrylate, allyl acrylate, trimethylolpropane monoacrylate, pentaerythritol monoacrylate, benzyl acrylate, methoxybenzyl acrylate, chloro Benzyl acrylate, hydroxybenzyl acrylate, hydroxyphenethyl acrylate, dihydroxyphene Chill acrylate, furfuryl acrylate, tetrahydrofurfuryl acrylate, phenyl acrylate, hydroxyphenyl acrylate, chlorophenyl acrylate, sulfamoylphenyl acrylate, 2- (hydroxyphenyl carbonyloxy) ethyl acrylate.

  Specific examples of methacrylic acid esters include methyl methacrylate, ethyl methacrylate, (n- or i-) propyl methacrylate, (n-, i-, sec- or t-) butyl methacrylate, amyl methacrylate, 2-ethylhexyl methacrylate, Dodecyl methacrylate, chloroethyl methacrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 2-hydroxypentyl methacrylate, cyclohexyl methacrylate, allyl methacrylate, trimethylolpropane monomethacrylate, pentaerythritol monomethacrylate, benzyl methacrylate, methoxybenzyl methacrylate, chloro Benzyl methacrylate, hydroxybenzyl methacrylate, hydroxy E phenethyl methacrylate, dihydroxyphenethyl methacrylate, furfuryl methacrylate, tetrahydrofurfuryl methacrylate, phenyl methacrylate, hydroxyphenyl methacrylate, chlorophenyl methacrylate, sulfamoylphenyl methacrylate, 2- (hydroxyphenyl carbonyloxy) ethyl methacrylate.

  Specific examples of acrylamides include acrylamide, N-methylacrylamide, N-ethylacrylamide, N-propylacrylamide, N-butylacrylamide, N-benzylacrylamide, N-hydroxyethylacrylamide, N-phenylacrylamide, and N-tolylacrylamide. N- (hydroxyphenyl) acrylamide, N- (sulfamoylphenyl) acrylamide, N- (phenylsulfonyl) acrylamide, N- (tolylsulfonyl) acrylamide, N, N-dimethylacrylamide, N-methyl-N-phenylacrylamide , N-hydroxyethyl-N-methylacrylamide and the like.

  Specific examples of methacrylamides include methacrylamide, N-methylmethacrylamide, N-ethylmethacrylamide, N-propylmethacrylamide, N-butylmethacrylamide, N-benzylmethacrylamide, N-hydroxyethylmethacrylamide, N -Phenylmethacrylamide, N-tolylmethacrylamide, N- (hydroxyphenyl) methacrylamide, N- (sulfamoylphenyl) methacrylamide, N- (phenylsulfonyl) methacrylamide, N- (tolylsulfonyl) methacrylamide, N , N-dimethylmethacrylamide, N-methyl-N-phenylmethacrylamide, N-hydroxyethyl-N-methylmethacrylamide and the like.

Specific examples of vinyl esters include vinyl acetate, vinyl butyrate, vinyl benzoate and the like.
Specific examples of styrenes include styrene, methyl styrene, dimethyl styrene, trimethyl styrene, ethyl styrene, propyl styrene, cyclohexyl styrene, chloromethyl styrene, trifluoromethyl styrene, ethoxymethyl styrene, acetoxymethyl styrene, methoxy styrene, dimethoxy styrene. Chlorostyrene, dichlorostyrene, bromostyrene, iodostyrene, fluorostyrene, carboxystyrene and the like.

The mass average molecular weight of the hydrophilic polymer containing the structure represented by the general formula (I) is preferably 1,000,000 or less, more preferably 1,000 to 1,000,000, and still more preferably 2,000 to 50,000.
If the mass average molecular weight is too large, the viscosity of the coating solution may be increased too much, and if it is too low, the adhesion and hydrophilicity may be insufficient.

  Specific examples of the hydrophilic polymer having a structure represented by the general formula (I) that can be suitably used in the present invention are shown below, but the present invention is not limited thereto.

(Hydrophilic polymer having a structure represented by the general formula (II))
In the general formula (II), R ³ , R ⁴ , R ⁵ and R ⁶ each independently represent a hydrogen atom or a hydrocarbon group, and specific examples and preferred ranges thereof are those represented by R ^{1 in the} general formula (I). , R ² . L ² and L ³ each independently represents a single bond or a linking group, and specific examples and preferred ranges are the same as those for L ^{1 in the} above general formula (I). The definitions of Y and X are the same as those in formula (I), and specific examples and preferred ranges are also the same.

In the general formula (II), L ³ has a single bond or one or more structures selected from the group consisting of —CONH—, —NHCONH—, —OCONH—, —SO ₂ NH—, and —SO ₃ —. A linking group is preferred.

Each compound for synthesizing the hydrophilic polymer having the structure represented by the general formula (II) is commercially available, and can be easily synthesized.
Any conventionally known method can be used as the radical polymerization method for synthesizing the hydrophilic polymer having the structure represented by the general formula (II).
Specifically, general radical polymerization methods include, for example, New Polymer Experiments 3 (1996, Kyoritsu Shuppan), Polymer Synthesis and Reaction 1 (Polymer Society of Japan, 1992, Kyoritsu Shuppan), New Experiment Chemistry Lecture 19 (1978, Maruzen), Polymer Chemistry (I) (Edited by The Chemical Society of Japan, 1996, Maruzen), Synthetic Polymer Chemistry (Materials Engineering Lecture, 1995, Tokyo Denki University Press) These can be applied.

  The hydrophilic polymer having the structure represented by the general formula (II) may be a copolymer with another monomer. Examples of other monomers used include acrylic esters, methacrylic esters, acrylamides, methacrylamides, vinyl esters, styrenes, acrylic acid, methacrylic acid, acrylonitrile, maleic anhydride, maleic imide, etc. These known monomers are also included. Specific examples thereof are the same as described above. By copolymerizing such monomers, various physical properties such as film forming property, film strength, hydrophilicity, hydrophobicity, solubility, reactivity, and stability can be improved.

  The mass average molecular weight of the hydrophilic polymer containing the structure represented by the general formula (II) is preferably 1,000,000 or less, more preferably 1,000 to 1,000,000, and even more preferably 10,000 to 50,000. If the mass average molecular weight is too large, the viscosity of the coating solution may be increased too much, and if it is too low, the adhesion and hydrophilicity may be insufficient.

The copolymerization ratio of each structural unit in the hydrophilic polymer containing the structure represented by the general formula (II) is the molar ratio (m ₂ ) of the structural unit containing Y and the molar ratio of the structural unit containing X (n ₂₎ range of _{m 2 / n 2 = 30 /} 70~99 / 1 is preferred, more preferably _{m 2 / n 2 = 40 /} 60~98 / 2, m 2 / n 2 = 50 / 50~97 / 3 is most preferred. If m ₂ / n ₂ is 30/70 or more, the hydrophilicity is not insufficient. On the other hand, if m ₂ / n ₂ is 99/1 or less, the reactive group amount is sufficient and sufficient curing is achieved. As a result, the film strength is sufficient.
The copolymerization ratio can be measured with a nuclear magnetic resonance apparatus (NMR) or a calibration curve prepared with a standard substance and measured with an infrared spectrophotometer.

  Specific examples of the hydrophilic polymer having the structure represented by the general formula (II) are shown below together with the mass average molecular weight (M.W.), but the present invention is not limited thereto. In addition, the polymer of the specific example shown below means that each structural unit described is a random copolymer or a block copolymer contained in the described molar ratio.

  It is preferable that the hydrophilic composition of the present invention includes both the structure represented by the general formula (I) and the structure represented by the general formula (II). It is more preferable to contain it in the ratio which becomes in the range of 50/50-5/95 in (structure represented by said) / (structure represented by the said general formula (II)).

  The hydrophilic polymer having a structure represented by the general formula (I) or (II) is preferably used in an amount of 20 to 99.5% by mass, based on the total solid content of the hydrophilic composition, and preferably 30 to 99.5. More preferably, it is used by mass%.

  The hydrophilic polymer having a structure represented by the general formula (I) or (II) forms a crosslinked film in a state where it is mixed with a hydrolysis and polycondensate of a metal alkoxide. The hydrophilic polymer, which is an organic component, is involved in the film strength and film flexibility. In particular, the viscosity measured at 20 ° C. of a 5% aqueous solution of the hydrophilic polymer is 0.1 to 100 mPa · s, preferably When it is in the range of 0.5 to 70 mPa · s, more preferably 1 to 50 mPa · s, good film properties are provided. The viscosity can be measured with an E-type viscometer (trade name: RE80L, manufactured by Tokyo Keiki Co., Ltd.).

Solvents used to synthesize hydrophilic polymers include tetrahydrofuran, ethylene dichloride, cyclohexanone, methyl ethyl ketone, acetone, methanol, ethanol, propanol, acetonitrile, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, 2-methoxyethyl acetate, diethylene glycol Dimethyl ether, 1-methoxy-2-propanol, 1-methoxy-2-propyl acetate, N, N-dimethylformamide, N, N-dimethylacetamide, N-methylpyrrolidone, toluene, ethyl acetate, methyl lactate, methyl lactate, dimethyl Examples thereof include sulfoxide and water. These solvents are used alone or in combination of two or more.
As the radical polymerization initiator used for synthesizing the hydrophilic polymer, known compounds such as an azo initiator, a peroxide initiator, and a redox initiator can be used.

[Crosslinking agent]
When the hydrophilic composition contains a hydrophilic polymer including the structure represented by the general formula (I), it is preferable to contain a crosslinking agent in order to obtain good curability. Further, when the hydrophilic composition contains a hydrophilic polymer containing the structure represented by the general formula (II), good curability can be obtained even when no crosslinking agent is contained, but the film strength is high. In order to obtain a very excellent coating film, a crosslinking agent may be contained.

As the crosslinking agent, an alkoxide compound (also referred to as a metal alkoxide) containing an element selected from Si, Ti, Zr, and Al is particularly preferable. A metal alkoxide is a hydrolyzable polymerizable compound having a functional group capable of being hydrolyzed and polycondensed in its structure and serving as a cross-linking agent, and has a cross-linked structure due to polycondensation of metal alkoxides. A strong cross-linked film can be formed and further chemically bonded to the hydrophilic polymer. The metal alkoxide can be represented by general formula (V-1) or general formula (V-2), wherein R ²⁰ represents a hydrogen atom, an alkyl group or an aryl group, and R ²¹ and R ²² represent an alkyl group or Represents an aryl group, Z represents Si, Ti or Zr, and m represents an integer of 0 to 2; The carbon number when R ²⁰ and R ²¹ represent an alkyl group is preferably 1 to 4. The alkyl group or aryl group may have a substituent, and examples of the substituent that can be introduced include a halogen atom, an amino group, and a mercapto group. This compound is a low molecular compound and preferably has a molecular weight of 2000 or less.

_{^{(R 20) m -Z- (OR}} 21) 4-m (V-1)
Al- (OR ²² ) ₃ (V-2)

  Specific examples of the metal alkoxide represented by the general formula (V-1) or the general formula (V-2) are shown below, but are not limited thereto.

  When Z is Si, that is, the hydrolyzable compound containing silicon includes, for example, trimethoxysilane, tetramethoxysilane, tetraethoxysilane, tetrapropoxysilane, methyltrimethoxysilane, dimethyldimethoxysilane, γ- Examples include chloropropyltriethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, phenyltrimethoxysilane, diphenyldimethoxysilane, and the like. Among these, particularly preferred are trimethoxysilane, tetramethoxysilane, tetraethoxysilane, methyltrimethoxysilane, dimethyldimethoxysilane, phenyltrimethoxysilane and the like.

When Z is Ti, i.e., including titanium, for example, trimethoxy titanate, tetramethoxy titanate, triethoxy titanate, tetraethoxy titanate, tetrapropoxy titanate, chlorotrimethoxy titanate, chlorotriethoxy titanate, ethyl Examples include trimethoxy titanate, methyl triethoxy titanate, ethyl triethoxy titanate, diethyl diethoxy titanate, phenyl trimethoxy titanate, and phenyl triethoxy titanate. When Z is Zr, that is, the one containing zirconium can include, for example, zirconates corresponding to the compounds exemplified as those containing titanium.
In the case where the central metal is Al, that is, examples of the hydrolyzable compound containing aluminum include, for example, trimethoxy aluminate, triethoxy aluminate, tripropoxy aluminate, triisopropoxy aluminate and the like. be able to.

  Among the above, tetramethoxysilane, tetraethoxysilane, methyltrimethoxysilane, and methyltriethoxysilane are particularly preferable.

  When the metal alkoxide compound selected from Si, Ti, Zr, and Al is a hydrophilic polymer containing a structure represented by the general formula (I), the total solid content of the hydrophilic composition is 0 to 0. 80% by mass is preferably used, and more preferably 0 to 70% by mass is used. When using the hydrophilic polymer containing the structure represented by the general formula (II), it is preferably used in an amount of 0 to 80% by mass, and 0 to 70% by mass based on the total solid content of the hydrophilic composition. More preferably.

[Curing catalyst]
In the hydrophilic composition, the hydrophilic polymer and a cross-linking agent such as a metal alkoxide compound are dissolved in a solvent and stirred well, so that these components are hydrolyzed and polycondensed to form an organic-inorganic composite sol solution. The sol solution forms a hydrophilic film having high hydrophilicity and high film strength. In preparing the organic / inorganic composite sol solution, it is preferable to use a curing catalyst in order to promote hydrolysis and polycondensation reaction.
As the curing catalyst, it is preferable to use an acidic catalyst, a basic catalyst, or a metal complex.

  As the curing catalyst, a curing catalyst that promotes a reaction that hydrolyzes and polycondenses a crosslinking agent such as the metal alkoxide compound to cause a bond with the reactive group-containing hydrophilic polymer is selected, and an acid or a basic compound is selected. Either an acid or a basic compound dissolved in a solvent such as water or alcohol (hereinafter collectively referred to as an acidic catalyst and a basic catalyst) is used. The concentration at which the acid or basic compound is dissolved in the solvent is not particularly limited, and may be appropriately selected according to the characteristics of the acid or basic compound used, the desired content of the curing catalyst, and the like. Here, when the concentration of the acid or basic compound constituting the curing catalyst is high, the hydrolysis and polycondensation rates tend to increase. However, when a basic catalyst with a high concentration is used, a precipitate may be generated in the sol solution. Therefore, when a basic catalyst is used, the concentration is preferably 1 N or less in terms of concentration in an aqueous solution.

The type of the acidic catalyst or the basic catalyst is not particularly limited. However, when it is necessary to use a catalyst having a high concentration, a catalyst composed of an element that hardly remains in the coating film after drying is preferable. Specifically, the acid catalyst is represented by hydrogen halide such as hydrochloric acid, nitric acid, sulfuric acid, sulfurous acid, hydrogen sulfide, perchloric acid, hydrogen peroxide, carbonic acid, carboxylic acid such as formic acid or acetic acid, and its R ³⁰ COOH. is the structural formula substituted carboxylic acid was replaced by an R ³⁰ other element or substituent, and sulfonic acids such as benzenesulfonic acid. Examples of the basic catalyst include an ammoniacal base such as aqueous ammonia, ethylamine and aniline, etc. And amines.

The curing catalyst is particularly preferably a metal complex.
The metal complex catalyst can promote hydrolysis and polycondensation of a metal alkoxide compound selected from Si, Ti, Zr, and Al, and can cause a bond with a hydrophilic polymer. Particularly preferred metal complex catalysts include metal elements selected from groups 2A, 3B, 4A and 5A of the periodic table and β-diketones, ketoesters, hydroxycarboxylic acids or esters thereof, amino alcohols, and enolic active hydrogen compounds. Metal complexes composed of selected oxo or hydroxy oxygen containing compounds.
Among the constituent metal elements, 2A group elements such as Mg, Ca, Sr and Ba, 3B group elements such as Al and Ga, 4A group elements such as Ti and Zr, and 5A group elements such as V, Nb and Ta are preferable. , Each forming a complex with excellent catalytic effect. Among them, complexes obtained from Zr, Al and Ti are excellent and preferred.

  In the present invention, the oxo- or hydroxy-oxygen-containing compound constituting the ligand of the metal complex is a β diketone such as acetylacetone (2,4-pentanedione) or 2,4-heptanedione, methyl acetoacetate, acetoacetic acid Ketoesters such as ethyl and butyl acetoacetate, lactic acid, methyl lactate, salicylic acid, ethyl salicylate, phenyl salicylate, malic acid, tartaric acid, methyl tartrate and other hydroxycarboxylic acids and esters thereof, 4-hydroxy-4-methyl-2-pentanone , 4-hydroxy-2-pentanone, 4-hydroxy-4-methyl-2-heptanone, ketoalcohols such as 4-hydroxy-2-heptanone, monoethanolamine, N, N-dimethylethanolamine, N-methyl- Monoethanolamine, diethanol Amino alcohols such as amine and triethanolamine, methylol melamine, methylol urea, methylol acrylamide, enol active compounds such as malonic acid diethyl ester, methyl group, methylene group or carbonyl carbon of acetylacetone (2,4-pentanedione) The compound which has a substituent is mentioned.

  A preferred ligand is acetylacetone or an acetylacetone derivative. In the present invention, the acetylacetone derivative refers to a compound having a substituent on the methyl group, methylene group or carbonyl carbon of acetylacetone. Substituents for substitution on the methyl group of acetylacetone are all linear or branched alkyl groups having 1 to 3 carbon atoms, acyl groups, hydroxyalkyl groups, carboxyalkyl groups, alkoxy groups, alkoxyalkyl groups, and acetylacetone As a substituent for substituting the methylene group, a carboxyl group, each of which is a linear or branched carboxyalkyl group and hydroxyalkyl group having 1 to 3 carbon atoms, and as a substituent for substituting the carbonyl carbon of acetylacetone, Is an alkyl group of 1 to 3, and in this case, a hydrogen atom is added to the carbonyl oxygen to form a hydroxyl group.

  Specific examples of preferable acetylacetone derivatives include ethylcarbonylacetone, n-propylcarbonylacetone, i-propylcarbonylacetone, diacetylacetone, 1-acetyl-1-propionyl-acetylacetone, hydroxyethylcarbonylacetone, hydroxypropylcarbonylacetone, acetoacetic acid. , Acetopropionic acid, diacetacetic acid, 3,3-diacetpropionic acid, 4,4-diacetbutyric acid, carboxyethylcarbonylacetone, carboxypropylcarbonylacetone, diacetone alcohol.

  Of these, acetylacetone and diacetylacetone are particularly preferred. The complex of the above acetylacetone derivative and the above metal element is a mononuclear complex in which one to four molecules of the acetylacetone derivative are coordinated per metal element, and the coordinateable bond of the acetylacetone derivative is a coordinateable bond of the acetylacetone derivative. When the number of hands is larger than the total number of hands, ligands commonly used for ordinary complexes such as water molecules, halogen ions, nitro groups, and ammonio groups may coordinate.

  Examples of preferred metal complexes include tris (acetylacetonato) aluminum complex, di (acetylacetonato) aluminum / aco complex, mono (acetylacetonato) aluminum / chloro complex, di (diacetylacetonato) aluminum complex, ethylacetate Acetate aluminum diisopropylate, aluminum tris (ethylacetoacetate), cyclic aluminum oxide isopropylate, tris (acetylacetonato) barium complex, di (acetylacetonato) titanium complex, tris (acetylacetonato) titanium complex, di-i -Propoxy bis (acetylacetonato) titanium complex salt, zirconium tris (ethyl acetoacetate), zirconium tris (benzoic acid) complex salt, etc. are mentioned. These are excellent in stability in aqueous coating solutions and in gelation promotion effect in sol-gel reaction during heat drying, but in particular, ethyl acetoacetate aluminum diisopropylate, aluminum tris (ethyl acetoacetate), di ( Acetylacetonato) titanium complex and zirconium tris (ethylacetoacetate) are preferred.

  Although the description of the counter salt of the metal complex described above is omitted in this specification, the type of the counter salt is arbitrary as long as it is a water-soluble salt that maintains the neutrality of the charge as the complex compound, such as nitrate, Salt forms such as halogenates, sulfates, phosphates, etc., that ensure stoichiometric neutrality are used. For the behavior of the metal complex in the silica sol-gel reaction, see J.A. Sol-Gel. Sci. and Tec. There is a detailed description in 16.209 (1999). The following scheme is estimated as the reaction mechanism. That is, in the coating solution, the metal complex has a coordinated structure and is stable, and in the dehydration condensation reaction that starts in the heat drying process after coating, it is considered that crosslinking is promoted by a mechanism similar to an acid catalyst. In any case, the use of this metal complex has led to satisfying the improvement of coating solution aging stability and film surface quality, and high hydrophilicity and high durability.

In addition to the above metal complex catalyst, the acidic catalyst and the basic catalyst may be used in combination.
The above metal complex catalyst can be easily obtained as a commercial product, and can also be obtained by a known synthesis method, for example, reaction of each metal chloride with an alcohol.

  It is preferable that 0.1-20 mass% is used for a curing catalyst with respect to the total solid of a hydrophilic composition, and it is more preferable that 1-10 mass% is used.

[Inorganic fine particles]
The hydrophilic composition may contain inorganic fine particles in order to improve hydrophilicity, prevent cracking of the film, and improve film strength. Inorganic fine particles are particularly preferred because of their high hydrophilicity. As the inorganic fine particles, for example, silica, alumina, magnesium oxide, titanium oxide, magnesium carbonate, calcium alginate or a mixture thereof can be preferably mentioned.
The inorganic fine particles preferably have an average particle size of 10 nm to 10 μm, and more preferably 0.5 to 3 μm. Within the above range, it is possible to form a coating film that is stably dispersed in the coating film, sufficiently maintains the film strength of the coating film, and has high durability and excellent hydrophilicity.
Among the inorganic fine particles as described above, a colloidal silica dispersion is particularly preferable and can be easily obtained as a commercial product.
The content of the inorganic fine particles is preferably 80% by mass or less, and more preferably 50% by mass or less, based on the total solid content of the hydrophilic composition.

[Surfactant]
A surfactant may be added to the hydrophilic composition.
Examples of the surfactant include those described in JP-A Nos. 62-173463 and 62-183457. For example, anionic surfactants such as dialkylsulfosuccinates, alkylnaphthalenesulfonates, fatty acid salts, polyoxyethylene alkyl ethers, polyoxyethylene alkyl allyl ethers, acetylene glycols, polyoxyethylene / polyoxypropylene blocks Nonionic surfactants such as copolymers, and cationic surfactants such as alkylamine salts and quaternary ammonium salts. An organic fluoro compound may be used in place of the surfactant. The organic fluoro compound is preferably hydrophobic. Examples of the organic fluoro compounds include fluorine surfactants, oily fluorine compounds (eg, fluorine oil) and solid fluorine compound resins (eg, tetrafluoroethylene resin). No. (columns 8 to 17) and those described in JP-A Nos. 62-135826.
The addition amount of the surfactant is appropriately selected according to the purpose, but is preferably 0.001 to 10% by mass, and 0.01 to 5% by mass with respect to the total solid content of the hydrophilic composition. More preferably.

[Ultraviolet absorber]
From the viewpoint of improving the weather resistance and durability of the coating film, an ultraviolet absorber can be used.
Examples of the ultraviolet absorber are described in JP-A-58-185679, JP-A-61-190537, JP-A-2-782, JP-A-5-97075, JP-A-9-34057, and the like. Benzotriazole compounds, benzophenone compounds described in JP-A No. 46-2784, JP-A No. 5-194843, US Pat. No. 3,214,463, etc., JP-B Nos. 48-30492 and 56-21141 Cinnamic acid compounds described in JP-A-10-88106, JP-A-4-298503, JP-A-8-53427, JP-A-8-239368, JP-A-10-182621, JP The triazine compounds described in JP-A-8-501291, Research Disclosure No. Examples thereof include compounds described in No. 24239, compounds that emit ultraviolet light by absorbing ultraviolet rays typified by stilbene and benzoxazole compounds, so-called fluorescent brighteners, and the like.
Although the addition amount of a ultraviolet absorber is suitably selected according to the objective, it is preferable that it is 0.5-15 mass% with respect to the total solid of a hydrophilic composition.

[Antioxidant]
An antioxidant can be added to improve the stability of the hydrophilic composition. Examples of the antioxidant include European Patent Application Nos. 223739, 309401, 309402, 310551, 310552, 457416, German Patent Application Publication No. 3435443, JP-A Nos. 54-262047, 63-113536, 63-163351, JP-A-2-262654, JP-A-2-71262, Examples include those described in JP-A-3-121449, JP-A-5-61166, JP-A-5-119449, US Pat. No. 4,814,262, US Pat. No. 4,980,275, and the like.
Although the addition amount of antioxidant is suitably selected according to the objective, it is preferable that it is 0.1-8 mass% with respect to the total solid of a hydrophilic composition.

[solvent]
The hydrophilic composition of the present invention preferably contains water, but when forming a coating film with the hydrophilic composition, in order to ensure the formation of a uniform coating film on the substrate, the hydrophilic composition is appropriately organic. It is also effective to add a solvent.
Examples of the organic solvent include ketone solvents such as acetone, methyl ethyl ketone, and diethyl ketone, alcohol solvents such as methanol, ethanol, 2-propanol, 1-propanol, 1-butanol, and tert-butanol, chloroform, and methylene chloride. Chlorine solvents, aromatic solvents such as benzene and toluene, ester solvents such as ethyl acetate, butyl acetate and isopropyl acetate, ether solvents such as diethyl ether, tetrahydrofuran and dioxane, ethylene glycol monomethyl ether and ethylene glycol dimethyl ether And glycol ether solvents.
In this case, it is effective to add in a range that does not cause a problem in relation to VOC (volatile organic solvent), and the amount is preferably 0 to 50% by mass, more preferably 0 to 30% with respect to the entire hydrophilic composition. It is the range of mass%.

[Polymer compound]
In order to adjust the physical properties of the coating film, various polymer compounds can be added to the hydrophilic composition as long as the hydrophilicity is not impaired. High molecular compounds include acrylic polymer, polyvinyl alcohol resin, polyvinyl butyral resin, polyurethane resin, polyamide resin, polyester resin, epoxy resin, phenol resin, polycarbonate resin, polyvinyl formal resin, shellac, vinyl resin, acrylic resin. Rubber resins, waxes and other natural resins can be used. Two or more of these may be used in combination. Of these, vinyl copolymers obtained by copolymerization of acrylic monomers are preferred. Furthermore, a copolymer containing “carboxyl group-containing monomer”, “methacrylic acid alkyl ester”, or “acrylic acid alkyl ester” as a structural unit is also preferably used as the copolymer composition of the polymer binder.
The addition amount of the polymer compound is appropriately selected according to the purpose, but is preferably 0.001 to 20% by mass, and 0.01 to 15% by mass with respect to the total solid content of the hydrophilic composition. It is more preferable that

[Antimicrobial agent]
In order to impart antibacterial, antifungal and antialgal properties to the hydrophilic member, an antibacterial agent can be contained in the hydrophilic composition. In the formation of the hydrophilic film, it is preferable to contain a hydrophilic and water-soluble antibacterial agent. By including a hydrophilic and water-soluble antibacterial agent, a surface hydrophilic member having excellent antibacterial, antifungal and antialgal properties can be obtained without impairing the surface hydrophilicity.
As the antibacterial agent, it is preferable to add a compound that does not lower the hydrophilicity of the hydrophilic member. Examples of such an antibacterial agent include inorganic antibacterial agents and water-soluble organic antibacterial agents. As the antibacterial agent, those exhibiting a bactericidal effect against fungi existing around us, such as bacteria represented by Staphylococcus aureus and Escherichia coli, and fungi such as fungi and yeast are used.
The addition amount of the antibacterial agent is appropriately selected according to the purpose, but is generally 0.001 to 10% by mass and 0.005 to 5% by mass with respect to the total solid content of the hydrophilic composition. Preferably, 0.01 to 3 mass% is more preferable, 0.02 to 1.5 mass% is particularly preferable, and 0.05 to 1 mass% is most preferable. If the content is 0.001% by mass or more, an effective antibacterial effect can be obtained. If the content is 10% by mass or less, the hydrophilicity is not lowered and the film strength is not adversely affected.

In addition to this, if necessary, for example, leveling additives, matting agents, waxes for adjusting film physical properties, tackifiers, etc. within a range that does not impair hydrophilicity in order to improve adhesion to the substrate, etc. Can be contained.
As the tackifier, specifically, a high molecular weight adhesive polymer described in JP-A-2001-49200, 5-6p (for example, (meth) acrylic acid and an alkyl group having 1 to 20 carbon atoms). An ester with an alcohol having, an ester of (meth) acrylic acid with an alicyclic alcohol having 3 to 14 carbon atoms, a copolymer comprising an ester of (meth) acrylic acid with an aromatic alcohol having 6 to 14 carbon atoms) And a low molecular weight tackifying resin having a polymerizable unsaturated bond.

The pH of the hydrophilic composition of the present invention is 7 or less, preferably 3-7. A pH greater than 7 is not preferred because hydrolysis and condensation proceed excessively and stability is lowered.
The hydrophilic composition of the present invention preferably has a solid content concentration of 1 to 8% by mass. If it is less than 1% by mass, hydrophilicity and adhesion may not be exhibited. If it is more than 8% by mass, the stability of the liquid may be lowered.
As the pH adjuster, hydrochloric acid, potassium hydroxide and the like are preferable.

[Preparation of hydrophilic composition]
The hydrophilic composition can be prepared by dissolving the hydrophilic polymer and, if necessary, the cross-linking agent and the curing catalyst in a solvent such as ethanol and then stirring. The reaction temperature is from room temperature to 80 ° C., and the reaction time, that is, the time for which stirring is continued is preferably in the range of 1 to 72 hours. By this stirring, hydrolysis and polycondensation of both components are advanced, and organic inorganic A composite sol solution can be obtained.

  The solvent used in preparing the hydrophilic composition is not particularly limited as long as it can uniformly dissolve and disperse these, but for example, an aqueous solvent such as methanol, ethanol, water and the like is preferable.

  As described above, the preparation of the organic-inorganic composite sol liquid (hydrophilic composition) for forming a hydrophilic film with the hydrophilic composition of the present invention utilizes the sol-gel method. For the sol-gel method, Sakuo Sakuo “Science of Sol-Gel Method”, Agne Jofusha (published) (1988), Satoshi Hirashima “Functional Thin Film Formation Technology by the Latest Sol-Gel Method” General Technology Center (Published) (1992) and the like, and the methods described therein can be applied to the preparation of the hydrophilic composition in the present invention.

〔Base material〕
A hydrophilic member can be formed by applying a hydrophilic composition on a substrate and drying to form a hydrophilic film.
The substrate is not particularly limited, but any of glass, plastic, metal, ceramics, wood, stone, cement, concrete, fiber, fabric, paper, leather, a combination thereof, and a laminate thereof can be suitably used. A particularly preferred substrate is a glass substrate or a plastic substrate.
As the glass substrate, any glass such as soda glass, lead glass or borosilicate glass may be used. Depending on the purpose, float plate glass, mold plate glass, ground glass, wire-filled glass, wire-filled glass, tempered glass, laminated glass, double-glazed glass, vacuum glass, security glass, highly heat-insulated Low-E double-glazed glass should be used. Can do. In addition, the hydrophilic film can be applied as it is with the base glass, but if necessary, the surface is hydrophilized by oxidation, roughening, etc. on one or both sides for the purpose of improving the adhesion of the hydrophilic film. Can be applied. Examples of the oxidation method include corona discharge treatment, glow discharge treatment, chromic acid treatment (wet), flame treatment, hot air treatment, ozone / ultraviolet irradiation treatment, and the like. As a roughening method, it can also be mechanically roughened by sandblasting, brush polishing or the like.

  The plastic substrate is not particularly limited, but polyester, polyethylene, polypropylene, cellophane, triacetyl cellulose, diacetyl cellulose, acetyl cellulose butyrate, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyethylene vinyl alcohol, polystyrene, polycarbonate, Examples include films or sheets of polymethylpentene, polysulfone, polyetherketone, acrylic, nylon, fluororesin, polyimide, polyetherimide, polyethersulfone, and the like. Of these, polyester films such as polyethylene terephthalate and polyethylene naphthalate are particularly preferred. In addition, in terms of optical properties, it is often preferable to have excellent transparency, but depending on the application, translucent or printed materials may be used. The thickness of the plastic substrate varies depending on the partner to be laminated. For example, in a portion with many curved surfaces, a thin one is preferred, and one having about 6 to 50 μm is used. Moreover, 50-400 micrometers is used for a plane or the place where intensity | strength is requested | required.

  For the purpose of improving the adhesion between the base material and the hydrophilic film, one or both surfaces of the base material can be subjected to surface hydrophilization treatment by an oxidation method, a roughening method, or the like as desired. Examples of the oxidation method include corona discharge treatment, glow discharge treatment, chromic acid treatment (wet), flame treatment, hot air treatment, ozone / ultraviolet irradiation treatment, and the like. As a roughening method, it can also be mechanically roughened by sandblasting, brush polishing or the like.

(Undercoat layer)
One or more undercoat layers can be provided between the substrate and the hydrophilic film. Examples of the material for the undercoat layer include a composition containing a silane coupling agent such as tetramethoxysilane and monoalkyltrimethoxysilane, a hydrophilic resin, and a water-dispersible latex. In particular, when the substrate is an aluminum plate, a composition containing a silane coupling agent is preferred. In the composition, components and blending ratios other than the silane coupling agent can be employed without particular limitation as the components and blending ratios usually used as this type of composition.

Examples of hydrophilic resins include polyvinyl alcohol (PVA), cellulose resins [methyl cellulose (MC), hydroxyethyl cellulose (HEC), carboxymethyl cellulose (CMC), etc.], chitins, chitosans, starch, and ether bonds. Examples include resins [polyethylene oxide (PEO), polyethylene glycol (PEG), polyvinyl ether (PVE), etc.], resins having a carbamoyl group [polyacrylamide (PAAM), polyvinyl pyrrolidone (PVP), etc.], and the like. Moreover, the polyacrylic acid salt which has a carboxyl group, maleic acid resin, alginate, gelatins, etc. can also be mentioned.
Furthermore, hydrolysis condensates of metal alkoxides typified by polysiloxane and the like are preferable, and the compounds described as the crosslinking agent can be used.
Among these, at least one selected from polyvinyl alcohol resins, cellulose resins, resins having an ether bond, resins having a carbamoyl group, resins having a carboxyl group, gelatins, and hydrolysis condensates of metal alkoxides is preferable. In particular, a hydrolysis condensate of polyvinyl alcohol (PVA) resin, gelatin, and metal alkoxide is preferable.

  Examples of the water-dispersible latex include acrylic latex, polyester latex, NBR resin, polyurethane latex, polyvinyl acetate latex, SBR resin, polyamide latex and the like. Among these, acrylic latex is preferable.

The above hydrophilic resins and water-dispersible latexes may be used alone or in combination of two or more, or a hydrophilic resin and a water-dispersible latex may be used in combination.
Moreover, you may use the crosslinking agent which bridge | crosslinks the said hydrophilic resin and water-dispersible latex.
As a cross-linking agent applicable to the present invention, a cross-linking agent that forms a cross-link by known heat can be used. General thermal crosslinking agents include those described in “Crosslinking agent handbook” by Shinzo Yamashita, Tosuke Kaneko, published by Taiseisha (1981). The number of functional groups of the crosslinking agent used in the present invention is not particularly limited as long as it is 2 or more and can be effectively crosslinked with a hydrophilic resin or water-dispersible latex. Specific thermal crosslinking agents include polycarboxylic acids such as polyacrylic acid, amine compounds such as polyethyleneimine, ethylene or propylene glycol diglycidyl ether, tetraethylene glycol diglycidyl ether, nonaethylene glycol diglycidyl ether, polyethylene or polypropylene Polyepoxy compounds such as glycol glycidyl ether, neopentyl glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, trimethylolpropane triglycidyl ether, sorbitol polyglycidyl ether, polyaldehyde compounds such as glyoxal and terephthalaldehyde, tolylene diene Isocyanate, hexamethylene diisocyanate, diphenylmethane isocyanate, xylylene diiso Polyisocyanate compounds such as anate, polymethylene polyphenyl isocyanate, cyclohexyl diisocyanate, cyclohexane phenylene diisocyanate, naphthalene-1,5-diisocyanate, isopropylbenzene-2,4-diisocyanate, polypropylene glycol / tolylene diisocyanate addition reaction product, block polyisocyanate Examples thereof include compounds, silane coupling agents such as tetraalkoxysilane, metal cross-linking agents such as acetylacetonate of aluminum, copper and iron (III), and polymethylol compounds such as trimethylolmelamine and pentaerythritol. Among these thermal crosslinking agents, a water-soluble crosslinking agent is preferable from the viewpoint of easy preparation of the coating solution and prevention of a decrease in hydrophilicity of the produced hydrophilic film.

Wherein the hydrophilic resin and / or water-dispersible latex, the total amount in the undercoat layer is preferably from 0.01 to 20 g / m ^2, 0.1 to 10 g / m ² is more preferable.
The undercoat layer composition can also be prepared by the same method as the hydrophilic composition.

[Layer structure when using hydrophilic members]
When the hydrophilic member is used in anticipation of the antifouling property and / or the antifogging effect, another layer can be appropriately added depending on the purpose, form and place of use. The layer structure added as needed is described below.

(Adhesive layer)
When the hydrophilic member is used by being affixed onto another substrate, a pressure-sensitive adhesive that is a pressure-sensitive adhesive is preferably used as an adhesive layer on the back surface of the substrate. As an adhesive, what is generally used for an adhesive sheet, such as a rubber adhesive, an acrylic adhesive, a silicone adhesive, a vinyl ether adhesive, and a styrene adhesive, can be used.
When an optically transparent material is required, an adhesive for optical use is selected. When a pattern such as coloring, semi-transparency, or matte is required, in addition to the patterning on the substrate, a dye, organic or inorganic fine particles can be added to the adhesive to produce an effect.
When a tackifier is required, a resin, for example, a rosin-based resin, a terpene-based resin, a petroleum-based resin, a styrene-based resin, or an adhesion-imparting resin such as a hydrogenated product thereof can be used alone or in combination.
The adhesive strength of the pressure-sensitive adhesive used in the present invention is generally called strong adhesion, and is 200 g / 25 mm or more, preferably 300 g / 25 mm or more, more preferably 400 g / 25 mm or more. In addition, the adhesive force here is based on JIS Z 0237 and is a value measured by a 180 degree peel test.

(Release layer)
When the hydrophilic member has the adhesive layer, a release layer can be further added. The release layer preferably contains a release agent in order to give release properties. As the release agent, generally, a silicone release agent composed of polyorganosiloxane, a fluorine compound, a long-chain alkyl modified product of polyvinyl alcohol, a long-chain alkyl modified product of polyethyleneimine, and the like can be used. In addition, various release agents such as a hot melt type release agent, a monomer type release agent that cures a release monomer by radical polymerization, cationic polymerization, polycondensation reaction, etc., and other acrylic-silicone copolymer Resins, acrylic-fluorine-based copolymer resins, urethane-silicone-fluorine-based copolymer resins, and the like, as well as resin blends of silicone-based resins and acrylic resins, and fluorine-based resins and acrylic-based resins. A resin blend is used. Moreover, it is good also as a hard-coat release layer obtained by hardening | curing the curable composition containing either an atom of a fluorine atom and / or a silicon atom, and an active energy ray polymeric group containing compound.

(Other layers)
A protective layer may be provided on the hydrophilic film. The protective layer has a function of preventing damage to the hydrophilic surface during handling, transportation, storage, and the like, and deterioration of hydrophilicity due to adhesion of dirt substances. As the protective layer, the release layer or the hydrophilic polymer layer used for the undercoat layer can be used. The protective layer is peeled off after the hydrophilic member is attached to an appropriate substrate.

[Form of hydrophilic member]
The hydrophilic member having the hydrophilic film may be supplied in the form of a sheet, a roll, or a ribbon, or may be supplied as a material that has been cut in advance in order to be attached to an appropriate substrate.

[Physical properties of hydrophilic film]
(Water drop contact angle)
The hydrophilicity is generally measured by a water droplet contact angle. The surface of the hydrophilic member of the present invention has a high hydrophilicity since the contact angle of airborne water droplets measured at 20 ° C. is 15 ° or less.

  When a hydrophilic member provided with a hydrophilic film is applied (used or attached) to a window glass or the like, transparency is important from the viewpoint of ensuring visibility. The hydrophilic film is excellent in transparency, and even when the film thickness is large, the transparency is not impaired and compatibility with durability is possible.

  The thickness of the hydrophilic film is preferably 0.05 μm to 10 μm, and more preferably 0.1 μm to 3 μm. If the film thickness is too thick, the film will crack, and if it is too thin, performance will be insufficient.

  Transparency is evaluated by measuring the light transmittance in the visible light region (400 nm to 800 nm) with a spectrophotometer. The light transmittance is preferably 100% to 70%, more preferably 95% to 75%, and most preferably in the range of 95% to 80%. By being in this range, the hydrophilic member provided with a hydrophilic film can be applied to various applications without obstructing the field of view.

[Method for producing hydrophilic member]
The hydrophilic member of the present invention can be obtained by applying a hydrophilic composition on a suitable substrate and heating and drying to form a hydrophilic film.
The drying temperature is preferably 20 to 200 ° C, more preferably 60 to 180 ° C. If the drying is too low and the drying is insufficient, the coating film strength may decrease. If the drying temperature is too high, cracks may occur.
The drying time is preferably 0.5 to 200 minutes, more preferably 5 to 90 minutes. When the drying time is short, the coating film strength may be lowered, and when the drying time is too long, cracks may occur, and therefore it is preferably within the above range.
As the heating means, a known means such as a dryer having a temperature adjusting function can be used.

  The hydrophilic member can be prepared by a known application method, and is not particularly limited. For example, a spray coating method, a dip coating method, a flow coating method, a spin coating method, a roll coating method, a film applicator method, a screen. A printing method, a bar coater method, a brush coating, a sponge coating or the like can be applied.

  The said coating method can apply | coat to the base-material surface by means, such as brush coating, spray coating, roller coating, dip coating, for example. The coating amount is not particularly limited, but generally it is considered that a range of about 0.1 to 500 μm is sufficient. Conditions for drying the coating film can be selected according to the type of the hydrophilic composition.

Although the use which can apply the hydrophilic composition concerning this invention, a hydrophilic film | membrane, and a hydrophilic member is illustrated, it is not limited to these.
Vehicle rearview mirrors, bathroom mirrors, toilet mirrors, dental mirrors, mirrors such as road mirrors; spectacle lenses, optical lenses, camera lenses, endoscope lenses, lighting lenses, semiconductor lenses, and copying machines Lenses such as lenses; prisms; window glass for buildings and monitoring towers; glass for other building materials; various vehicles such as automobiles, railway vehicles, aircraft, ships, submersibles, snow vehicles, ropeway gondola, amusement park gondola, etc. Windshields; Windshields for various vehicles such as automobiles, railway vehicles, aircraft, ships, submersibles, snowmobiles, snowmobiles, motorcycles, ropeway gondola, amusement park gondola; protective goggles, sports goggles, protective Mask shield, sports mask shield, helmet shield, frozen food display case glass; measuring instrument cover glass, building material, outer wall Building exteriors such as roofs, building interiors, window frames, window glass, structural members, automobiles, railway vehicles, aircraft, ships, bicycles, exteriors and paintings of vehicles such as motorcycles, exteriors of machinery and equipment, dustproof covers and Paint, traffic signs, various display devices, advertising towers, sound barriers for roads, sound barriers for railways, bridges, guardrail exteriors and paints, tunnel interiors and paints, insulators, solar battery covers, solar water heater heat collection covers, greenhouses , Vehicle lighting cover, housing equipment, toilet bowl, bathtub, wash basin, lighting fixture, lighting cover, kitchenware, tableware, dishwasher, dish dryer, sink, cooking range, kitchen hood, exhaust fan, signage, transportation Signs, noise barriers, greenhouses, insulators, vehicle covers, tent materials, reflectors, shutters, screen doors, solar battery covers, solar water heater covers, etc. Pavements, outdoor lighting, stones / tiles for artificial waterfalls / artificial fountains, bridges, greenhouses, exterior walls, sealers between walls and glass, guardrails, verandas, vending machines, air conditioner outdoor units, outdoor benches, various display devices, shutters , Toll booth, toll box, roof gutter, vehicle lamp protection cover, dust cover and painting, painting of machinery and equipment, exterior and painting of advertising tower, structural members, housing equipment, toilet, bathtub, wash basin, lighting fixture , Kitchen utensils, tableware, tableware dryer, sink, cooking range, kitchen hood, ventilation fan, window rail, window frame, tunnel inner wall, tunnel lighting, window sash, heat dissipation fins, pavement, bathroom toilet mirror, Greenhouse ceilings, vanities, automobile bodies, snow country roofing materials, antennas, power transmission lines, medical diagnostic devices, medical catheters, personal computers and televisions It includes displays, cosmetic containers, filters, automotive aluminum wheels, camera viewfinders, CCD cover glasses, printing device members, films that can be attached to the article surface, patches, and the like.
In particular, it can be suitably used as a material for forming fins in heat exchangers and air conditioners.

  EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, the scope of the present invention is not limited by these.

Each hydrophilic composition was prepared as follows.
(Composition of hydrophilic composition)
(1) Water Amount shown in Table 1 (2) Sol-gel solution 98 g
(3) 2 g of 5% by weight aqueous solution of an anionic surfactant having the following structure

Dilute hydrochloric acid or potassium hydroxide aqueous solution was added to the hydrophilic composition to adjust the pH as shown in Table 1 below.
Here, in the sol-gel solution, a total of 9.7 g of one or two hydrophilic polymers shown in Table 1 was added to 1.8 g of ethanol, 0.1 g of acetylacetone, 0.1 g of tetraethoxytitanium, and 86.5 g of water. It was obtained by stirring for 2 hours.

  The pH was measured at 25 ° C. with a pH METER HM60G manufactured by Toa DKK Corporation.

The following evaluation was performed about the obtained hydrophilic composition. The results are shown in Table 1.
<Stability over time>
The hydrophilic composition was sealed in a polyethylene bottle, aged at room temperature (about 25 ° C.), and the appearance of the liquid after one month was visually confirmed.
◎ No change in appearance ○ Some cloudiness but no significant change △ Some gelation or precipitation × Overall liquid gelation

The aluminum plate (A1200, thickness 0.1 mm) was degreased by immersing it in an alkaline cleaning liquid (Yokohama Yushi Kogyo Co., Ltd., semi-clean A 5% aqueous solution) for 10 minutes and washing with water.
Each hydrophilic composition that was aged under the above conditions was filtered with a filter paper.
Each hydrophilic composition was applied onto a degreased aluminum substrate with a bar so as to be 0.4 g / m ² after drying, and dried at 150 ° C. for 30 minutes. In this way, a hydrophilic member having a hydrophilic film was obtained.

The following evaluation was performed about the obtained hydrophilic member. The results are shown in Table 1.
<Contact angle>
The water droplet contact angle of distilled water was measured with DROP MASTER 500 manufactured by Kyowa Interface Science Co., Ltd. and evaluated according to the following criteria.
◎ 15 °
○ 16-20 °
△ 21-40 °
× 41 ° or more <Adhesion evaluation>
A cellophane tape of 5 cm in length (manufactured by Sekisui Chemical Co., Ltd., # 252, 25 mm width, adhesive strength: 750 gf / 25 mm width) was applied to the coated surface, and it was visually confirmed whether or not the coated film was peeled off.
◎ No exfoliation ○ Partially exfoliated △ About half of the exfoliation test part film exfoliated × Fully exfoliated

From the results shown in Table 1, all of the hydrophilic compositions of each example were excellent in stability over time, and excellent in hydrophilicity and adhesion. Among them, Examples 5, 6, 7, 8, 9, and 12 were excellent in all-time stability, hydrophilicity, and adhesion.
In Examples 1, 2, and 3, stability with time was high because the content of reactive groups was small, but hydrophilicity and adhesion were slightly lower than those in Examples 5, 6, 7, 8, 9, and 12.
In Example 4, since the content of reactive groups was large, the temporal stability was slightly lower than that in Examples 5, 6, 7, 8, 9, and 12, but the hydrophilicity and adhesion were very excellent.
Since the pH of Example 10 was low, the temporal stability was slightly lowered as compared with Examples 5, 6, 7, 8, 9, and 12.
Comparative Examples 1, 2, 3, and 4 are inferior in stability over time because the pH is too high.
Comparative Examples 5, 6, 7, and 8 are inferior in hydrophilicity and adhesiveness because there are few reactive groups.

  The structures and mass average molecular weights (GPC measurement, standard polystyrene standard) of the hydrophilic polymers A to E in Table 1 are shown below.

Claims (11)

pH is 7 or less, and contains at least one selected from a hydrophilic polymer having a structure represented by the following general formula (I) and a hydrophilic polymer having a structure represented by the following general formula (II). A hydrophilic composition comprising 1.2% by mass or more of the reactive group represented by X in the general formula (I) and the following general formula (II) with respect to the total solid content.

In the general formulas (I) and (II), R ¹ , R ² , R ³ , R ⁴ , R ⁵ and R ⁶ each independently represents a hydrogen atom or a hydrocarbon group, X represents a reactive group, A , L ¹ , L ² and L ³ each independently represents a single bond or a linking group, and Y represents —NHCOR, —NHCO ₂ R, —NHCONR ₂ , —CONH ₂ , —NR ₂ , —CONR ₂ , —OCONR _2. , —COR, —OH, —OR, —OM, —CO ₂ M, —CO ₂ R, —SO ₃ M, —OSO ₃ M, —SO ₂ R, —NHSO ₂ R, —SO ₂ NR ₂ , — _{PO 3 M, -OPO 3 M,} - (CH 2 CH 2 O) n H, - (CH 2 CH 2 O) represents the n CH ₃ or -NR ₃ Z ^1, wherein, R represents a hydrogen atom, an alkyl group Represents an aryl group or an aralkyl group, and when there are a plurality thereof, they may be the same or different from each other Ku, M represents a hydrogen atom, an alkyl group, an alkali metal, alkaline earth metal or an onium, n represents an integer, Z ¹ represents a halogen ion.   The hydrophilic composition according to claim 1, comprising 1.2 to 11.9% by mass of the reactive group represented by X with respect to the total solid content.   The hydrophilic composition according to claim 1 or 2, wherein the pH is in the range of 3-7.   Solid content concentration is 1-8 mass%, The hydrophilic composition in any one of Claims 1-3 characterized by the above-mentioned.   The hydrophilic composition according to claim 1, wherein the reactive group represented by X is 6.8 to 11.9% by mass based on the total solid content.   The hydrophilic composition according to claim 1, wherein the X contains a silane coupling group.   The hydrophilic polymer containing the structure represented by the general formula (I) and the hydrophilic polymer containing the structure represented by the general formula (II) are both contained. A hydrophilic composition according to claim 1.   The hydrophilic polymer containing the structure represented by the general formula (I) and the hydrophilic polymer containing the structure represented by the general formula (II) are within a range of 50/50 to 5/95 by mass ratio. The hydrophilic composition according to claim 7, which is contained in a proportion.   The hydrophilic member which has a hydrophilic film | membrane formed using the hydrophilic composition in any one of Claims 1-8 on the surface of a base material.   A heat exchanger having fins, wherein the hydrophilic member according to claim 9 is used as a material for forming the fins.   An air conditioner using the heat exchanger according to claim 10.