Coating pigment for cellulose - based printing media

US5423911A · kind A · utility

Assignee

• Sud-Chemie A.G. · DE

Inventors

• Helmut Coutelle · Freising, DE
• Joachim Hlavatsch · Ottobrunn, DE
• Friedrich Ruf · Ramstein-Miesenbach, DE
• Hartmann Schott · Moosburg an der Isar, DE

Key dates

• Filing date: May 25, 1993
• Grant date: Jun 13, 1995
• Expiry date: May 25, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/22
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A coating pigment for coating printing media, especially paper and cardboard, is made with at least one swellable layer silicate which can be fixed on the printing medium essentially without binders, where the amount of swellable layer silicate is at least 30 weight percent and the swelling volume of the coating pigment is 5 to 30 ml, based on suspension of 2 g coating pigment in 100 ml water. A water-based coating which contains such a coating pigment and a printing medium that is coated on one or both sides with the coating pigment or coating are also described. The deinkability of printed printing media coated with the coating pigment is improved.