Photochromic coating composition comprising nanoscales particles and process for providing substrate coated with the same

US6639039B1 · kind B1 · utility

Assignee

• Institut fuer Neue Materialien gemeinnuetzige GmbH · DE

Inventors

• Kira Fries · Neunkirchen, DE
• Lisong Hou · Shanghai, CN
• Marion Pietsch · Laufersweiler, DE
• Martin Mennig · Idar-Oberstein, DE
• Helmut Schmidt · Riegelsberg, DE

Key dates

• Filing date: Jul 31, 2000
• Grant date: Oct 28, 2003
• Expiry date: Jul 31, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S977/897
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A photochromic coating composition contains a silicon-containing precondensate derived from a hydrolysable silane containing a polymerizable functional group on a hydrolysis-stable radical, a photochromic dye, a stabilizer, and nanoscale particles. The coating composition, when applied to transparent plastic and glass substrates and cured, gives a coating having high light stability and good scratch resistance.