Abstract:
A thermal-sensitive transparency is disclosed. A transparent film substrate is coated with a mixture of a binder and sulfonic acid. A second coating of a binder and a chromogenic compound is applied over the first coating. The binder of the first coating is not soluble in the solvent used to apply the second coating. The thus coated transparency can be imaged in conventional thermal copy machines and used in conventional projection equipment.
Abstract:
Processes for the synthesis of phthalides and fluorans are disclosed. New isolatable intermediate phthalides have been found which serve as precursors to the production of fluorans. The products of this invention are synthesized from keto acids and phenolic amines, wherein the mole ratio of the keto acids to the phenolic amines is in excess of 1:1. Not only is product yield greatly improved, but usual condensation times of 24 hours and longer have been reduced to about 5 hours.