Patent ID: 9238769
Filing Date: 2016-01-19
CPC Classification: B05D,C08F,C09D,C09K,Y10T

Claim Text:
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/cm 3 ) 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; (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 CH