Process of preserving paper

US6071475A · kind A · utility

Assignee

• Institut fuer Neue Materialien gemeinnuetzige GmbH · DE

Inventors

• Helmut Schmidt · Riegelsberg, DE
• Reiner Kasemann · Munich, DE
• Stefan Sepeur · Wadgassen, DE
• Helmut Duddeck · Bochum, DE

Key dates

• Filing date: May 21, 1998
• Grant date: Jun 6, 2000
• Expiry date: May 21, 2018

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21H25/18
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A process is disclosed for preserving paper involving the following steps: PA0 (a) a plurality of paper layers in contact with one another at least in regions is simultaneously brought into contact with a preservative fluid containing polycondensates based on one or more hydrolytic polycondensation-capable compounds of elements M of main groups III-V and sub-groups II-IV of the Periodic Table; in said polycondensates, at least one organic group (G) with at least two carbon atoms and for each carbon atom at least one atom selected from hydrogen or fluorine and without polar substituents is bound, either directly via one of the carbon atoms or via a connecting group A, to at least 0.1% of the central atoms M; and PA0 (b) the paper thus treated with the preservative fluid is dried and/or hardened.