Patent ID: 9097588
Filing Date: 2015-08-04
Classification: C09D,G01J,G03F

Abstract:
1. An ultraviolet radiation (UVR) response indicator which comprises a first UVB and/or UVA radiation sensitive material which has been modified so as to display an altered characteristic in a delayed manner in response to UVB and/or UVA radiation exposure and which comprises a solvent-soluble ion-pair, wherein the first UVB and/or UVA radiation sensitive material comprises a UVB and/or UVA radiation-driven acid release agent and a pH indicator which displays altered colour between deprotonated and acid forms, wherein the UVB and/or UVA radiation-driven acid release agent includes one or more dyes selected from the group consisting of iodonium salts and sulphonium salts, and wherein the first UVB and/or UVA radiation sensitive material further comprises a proton-scavenging agent so as to delay protonation of the pH indicator by the UVB and/or UVA radiation-driven acid release agent, wherein the proton-scavenging agent is a base.