Monolayer film and hydrophilic material comprising the same

摘要

The invention provides monolayer films which not only have hydrophilicity and are excellent in such properties as antifogging properties, antifouling properties, antistatic properties and anti-condensation properties but also tend to exhibit excellent transparency even with a large film thickness and excellent scratch resistance, as well as stacks having the monolayer film. The monolayer film is obtained by preparing a mixture including a monomer composition and a solvent, the monomer composition including a specific monomer and a polyvalent monomer having two or more (meth)acryloyl groups and being free of sulfonic group, carboxyl group and phosphoric group in a specific molar ratio, the solvent having a specific solubility parameter σ; applying the mixture onto a substrate and removing at least part of the solvent; and polymerizing the monomer composition to produce a monolayer film having at least one anionic hydrophilic group selected from a sulfonic group, a carboxyl group and a phosphoric group and a specific anion concentration ratio (Sa/Da) of the anion concentration (Sa) at the outer surface to the anion concentration (Da) at the middle point between the inner surface in contact with the substrate and the outer surface.

主权项

1. A monolayer film disposed on a substrate, obtained by preparing a mixture including a monomer composition and a solvent, the monomer composition including a monomer (1) represented by General Formula (1) below and a polyvalent monomer (II) having two or more (meth)acryloyl groups and being free of sulfonic group, carboxyl group and phosphoric group in a monomer (I)/polyvalent monomer (II) molar ratio of 1/1000 to less than 1/30, the solvent including a compound with a solubility parameter σ of not less than 9.3 (cal/cm3)1/2;
applying the mixture onto the substrate and removing at least part of the solvent; and polymerizing the monomer composition including the monomer (I) and the monomer (II); the monolayer film having at least one anionic hydrophilic group selected from a sulfonic group, a carboxyl group and a phosphoric group, the anion concentration ratio (Sa/Da) of the anion concentration (Sa) at the outer surface to the anion concentration (Da) at the middle point between the inner surface in contact with the substrate and the outer surface being not less than 1.1;
[X]s[M1]l[M2]m  (1) (in Formula (1), s indicates 1 or 2; l and m indicate integers satisfying s=1+2m; M1 is at least one monovalent cation selected from hydrogen ion, ammonium ions and alkali metal ions; M2 is at least one divalent cation selected from alkaline earth metal ions; and X is at least one monovalent anion selected from groups represented by General Formulae (1-1) to (1-4) below: (in Formulae (1-1) to (1-4), J and J′ are each independently H or CH3; n indicates 0 or 1; and Rs are each independently an aliphatic hydrocarbon group of 1 to 600 carbon atoms optionally substituted at a carbon atom with at least one group selected from aromatic groups, aliphatic cyclic groups, ether groups and ester groups)).