MEJORAS INTRODUCIDAS EN LA FABRICACION DE AGREGADOS DE HOJAS DE COPIA SENSIBLES AL CALOR

摘要

A transparent plastics support is coated with a layer comprising 1 part by weight of dye to 2-5 parts by weight of polymeric binder. In the examples, a polyethylene terephthalate support is coated with either ethyl cellulose or vinyl chloride/vinyl acetate copolymer and either methylene blue or a calco oil dye. The dye layer may contain a plasticizer such as dioctyl phthalate. Specification 829,002 is referred to.