Alkanolammonium-containing triazinyl flavonate whiteners

US7608168B2 · kind B2 · utility

Assignee

• KEMIRA OYJ · FI

Inventors

• Heinz Giesecke · Leverkusen, DE
• Bernhard Hunke · Hennef (Sieg), DE

Key dates

• Filing date: Jul 22, 2005
• Grant date: Oct 27, 2009
• Expiry date: May 8, 2026

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21H21/16
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A process for whitening paper in a size press includes contacting a cellulose sheet with a size press liquor that contains a surface size and a particular whitener containing sulfonate groups and cations, M, wherein at least 10% of all cations M have the formulain which R5 to R7, independently of one another, denote hydrogen, a C1-C4-alkyl radical or an optionally further substituted C2-C4-hydroxyalkyl radical, and R8 denotes an optionally further substituted C2-C4-hydroxyalkyl radical. The process provides superior paper whitening compared to a corresponding process in which the whitener cations are all sodium or potassium ions.