Transparent coating compositions containing nanoscale particles and having improved scratch resistance

US6020419A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Manfred Bock · Leverkusen, DE
• Theodor Engbert · Recklinghausen, DE
• Stefan Groth · Leverkusen, DE
• Bernd Klinksiek · Bensberg, DE
• Philip E. Yeske · Pittsburgh, US
• Gerhard Jonschker · Friedrichsthal, DE
• Ulrike Dellwo · Gusenburg, DE

Key dates

• Filing date: Mar 16, 1999
• Grant date: Feb 1, 2000
• Expiry date: Mar 16, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K3/36
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The present invention relates to transparent coating compositions containing a binder and 0.5 to 25 wt. %, based on resin solids, of a material consisting of nanoscale primary particles obtained by jet dispersion of the nanoscale particles in the coating composition. The present invention also relates to a process for the production of these transparent coating compositions containing nanoscale particles by passing the coating compositions containing nanoscale primary particles and a binder in at least one pass through an apparatus which has at least one nozzle or at least one slit having a bore diameter or slit width of 0.05 to 1 mm and a length to diameter ratio of the bore or a depth to slit width ratio of the slit of 1 to 10, wherein there is a pressure differential between the nozzle inlet and outlet of at least 0.5, preferably of 1 MPa.