BASIC COLOR-CHANGING pH INDICATOR MONOMER AND pH INDICATOR COPOLYMER

摘要

PROBLEM TO BE SOLVED: To provide a pH indicator monomer that changes its color in a basic range, and a color-changing copolymer using the same.SOLUTION: A polymerizable group is bonded to the 6- or 5-position of the isobenzofuran fused-ring of an α-Naphtholphthalein represented by a formula (1) to obtain a basic color-changing pH indicator monomer that changes its color in a basic pH range. The pH indicator monomer can be copolymerized with a non-ionic monomer containing an electrically neutral site and polymerizable group to obtain a pH indicator copolymer.SELECTED DRAWING: Figure 4