公开(公告)号：JPH01148961A

公开(公告)日：1989-06-12

申请号：JP30725587

申请日：1987-12-04

Applicant: TOA ELECTRONICS

Inventor： YOTSUYANAGI TAKAO ,  HOSHINO HITOSHI ,  IGARASHI TOSHIO ,  KAWAMURA KUNIO ,  KATSUMATA SADAHIRO

IPC: G01N31/22 ,  C09K3/00

Abstract: PURPOSE:To make it possible to discolor a material in an arbitrarily specified pH range with porphylin having a high mol extinction coefficient as a pH indicator, by supporting and fixing hydrophobic porphylin with water-insoluble macromolecules, and the like. CONSTITUTION:Hydrophobic porphylin is supported and fixed with water- insoluble macromolecules. Or the hydrophobic porphylin and an organic material having positive or negative electric charge are supported and fixed with the water-insoluble macromolecules together. Thus a pH sensitive solid-state material is obtained. As the method for manufacturing the pH sensitive thin film, the water-insoluble macromolecules are dissolved into a solvent such as tetrahydrofuran. This material and porphylin are added. The organic material having the positive or negative charge is further added as required. Thereafter, this is developed on a transparent resin plate, a glass plate or the surface of water. This method is simple. Thus, a very thin film is obtained. In this way, discoloration can be performed in an arbitrarily specified pH range, with porphylin having a high mol extinction coefficient as a pH indicator.