Fluorescent whitening agents and mixtures thereof

US10787769B2 · kind B2 · utility

Assignee

• BLANKOPHOR GMBH & CO. KG · DE

Inventors

• Marco Hafermann · Bensberg, DE
• Bernd Hauschel · Leverkusen, DE
• Bernhard Hunke · Hennef (Sieg), DE
• Theo Lansing · Leverkusen, DE
• Michael Kraemer · Nidderau, DE
• Robert Peekhaus · Leverkusen, DE

Key dates

• Filing date: May 17, 2017
• Grant date: Sep 29, 2020
• Expiry date: Jul 20, 2037

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21H23/56
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

Novel fluorescent whitening agents, compositions or mixtures thereof with known fluorescent whitening agents, their preparation, and their use. The novel fluorescent whitening agents (FWAs) contain three structural subunits derived from 4,4′-diamino-2,2′-stilbenedisulfonic acid. The novel compounds and their mixtures with known FWAs show very good effectiveness as fluorescent whitening agents for cellulosic materials, in particular for paper.