Functional dyes used as an indicator in aerobically hardening compositions

US6518356B1 · kind B1 · utility

Assignee

• Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

• Carsten Friese · Hamburg, DE
• Georg Knuebel · Goldkronach, DE

Key dates

• Filing date: Jul 24, 2000
• Grant date: Feb 11, 2003
• Expiry date: Jul 24, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2896
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to the addition of dyes to aerobically curable adhesive compositions based on free-radically polymerizable compounds. The dyes serve as user-friendly indicators for monitoring the oxygen intake required to trigger the polymerization. The indicator dyes are especially suitable for aerobically adhesive compositions which contain activator systems for forming peroxides upon contact with air. Suitable dyes and indicators are those whose color change in aqueous solution lies within a pH range from 3.0 to 6.5.