Organic Media for Optical Recording
Original Publication Date: 1987-Mar-01
Included in the Prior Art Database: 2005-Feb-01
Organic coatings are described which, when properly formulated, undergo color changes in the visible region upon absorption of energy. The color changes are due to phase transitions of organic dye molecules from an amorphous state to an ordered aggregate state. Erasure of the states (color) can be effected with proper treatment. Dyes of the squarylium or diazo class which exhibit a high degree of planarity are useful in this application. The dyes can be used alone but are preferably formulated into a polymeric binder, such as polyesters, epoxies, acrylates, etc., which yield better coating quality and a lower thermal threshold for the phase transition.