Erasable xerographic vellum

摘要

An erasable vellum adapted for imaging in xerographic copiers since it is free of volatile oil and organic solvent conventionally used for transparentizing fibrous cellulosic substrates. The erasable vellum is produced from a rag pulp paper transparentized by a polybutene emulsion, preferably incorporated in the pulp during the papermaking process. The transparentized paper substrate is given a barrier coating of an aqueous emulsion of styrene-butadiene and an overcoating of a vinyl acetate co-polymer, preferably vinyl acrylic-vinyl acetate. If desired, calcium carbonate and blue tint may be included in the substrate and a minor proportion of precipitated silicone dioxide may be included in the overcoat.