MULTIPLE COMPONENT MATERIALS HAVING A COLOR-CHANGING COMPOSITION

摘要

The present invention relates to a multiple-component material including a substrate and a film layer on the substrate. The film layer includes a color- changing composition to indicate a change in condition, such as a change in pH. The color-changing composition includes a water-insoluble, film-forming polymer, a pH adjuster and a water-insoluble particle. The water-insoluble particle has a charged colorant immobilized on it.