Patent ID: 8568783

Claim:
A method for preparing a hydrophilized substrate, comprising: (A) treating a surface of a substrate with a hydrolyzable silyl group-containing acid anhydride compound having the general formula (1): wherein R 1 is hydrogen or C 1 -C 6 alkyl, R 2 is each independently an organic group selected from the group consisting of C 1 -C 30 alkyl, aryl, aralkyl, and fluoroalkyl, A is a straight or branched C 2 -C 6 alkylene, a is an integer of 1 to 3, b is an integer of 0 to 2, and a+b=3, (B) immersing the surface treated substrate in water or a mixture of water and a solvent, adding a base thereto, and heating the liquid for thereby hydrolyzing the acid anhydride moiety to open its ring and neutralizing the resultant carboxylic acid, and (C) removing water and the solvent until the substrate is dry.