Gloss-coated paper with enhanced runnability and print quality

Abstract

This invention provides a gloss-coated electrophotographic paper with superior runnability and print quality in colour and monochrome copiers and printers. The coated paper product comprises a paper substrate coated on at least one side with a pigmented coating. The pigment coating consists of a mixture of at least three different pigments and a binder. The coating may further include a lubricant. Optionally, the coating formulation may contain an optical brightening agent, a defoamer and a thickener. In addition, the gloss coated electrophotographic paper of this invention provides a superior toner adhesion in colour and monochrome electrophotographic imaging applications.

Description

[0001] This application claims the benefit of U.S. Provisional Application Ser. No. 60 / 405,515 filed on Aug. 22, 2002, which is incorporated herein by reference.FIELD OF THE INVENTION [0002] The present invention relates to gloss-coated electrophotographic paper that gives superior copier runnability and print quality. In particular, a paper substrate coated on at least one surface with a pigmented coating comprising a mixture of at least three different pigments and a binder is provided. BACKGROUND OF THE INVENTION [0003] Gloss-coated papers suitable for electrophotographic printing are in demand due to their superior image quality and toner adhesion properties as compared to uncoated paper grades. The surface of a gloss-coated sheet is very smooth as a result of calendering operation. The high smoothness is attributed to many advantageous imaging performances, however, it also presents challenges for the runnability of gloss coated paper in sheet-fed digital equipment such as colo...

AI Technical Summary

Benefits of technology

[0016] An objective of this invention is to provide a gloss-coated paper with superior runnability in electrophotographic copiers and printers. An objective is also to achieve a superior image quality and improved blister resistance. The coated paper product comprises a paper substrate coated on at least one side with a pigmented coating. The pigmented coating has a glossy finish as well as a rough surface that provides paper with enhanced runnability.

[0021] The coated electrophotographic paper of this invention provides a TAPPI 75-degree gloss is in the range of 45-85%. Moreover, the coated electrophotographic paper of this invention exhibits high blister resistance.

Problems solved by technology

The high smoothness is attributed to many advantageous imaging performances, however, it also presents challenges for the runnability of gloss coated paper in sheet-fed digital equipment such as color copiers and laser and color laser printers.

Coated papers are also more susceptible to blistering due to high fusing temperatures in colour copiers and even some high-speed black and white copiers.

None of the coating designs in the prior arts overcomes the shortcomings of blistering, feeding jams in high-speed copiers.