Copy paper

摘要

A sheet of paper suitable as a multi-copy paper or once only copy paper is made by coating with a layer of finely particulate mutually adherent particles, of a vinyl chloride polymer if pigments are used as colouring matter and of any swellable polymer if a dyed layer is to be used. Generally, the particulate material is swelled using suitable swelling agents and applied to a support layer by any suitable coating process.