Process for the manufacture of a sheet or film made of polycarbonate with a soft scratch-resistant coating

US5277944A · kind A · utility

Assignee

• Saint-Gobain Vitrage International · FR

Inventors

• Gerhard Holzer · Aachen, DE
• Otto Jandeleit · Alsdorf, DE
• Ingrid Musil · Aachen, DE
• Udo Gelderie · Stolberg, DE

Key dates

• Filing date: Apr 1, 1991
• Grant date: Jan 11, 1994
• Expiry date: Apr 1, 2011

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31551
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the manufacture of a plate, sheet or film made of an impact-resistant polymer having thereon a scratch-resistant flexible coating of transparent polyurethane is described comprising the steps of: PA1 (i) applying a first reaction mixture on the plate, sheet or film of impact-resistant polymer, said first reaction mixture comprising: PA2 (a) an isocynate component and PA2 (b) a polyol component, and PA1 (ii) applying a second reaction mixture onto said first layer before said first layer has completely hardened, said second reaction mixture comprising PA2 (c) a second isocynate component, and PA2 (d) a second polyol component. The first reaction mixture has a composition which guarantees good adhesion to the plate, sheet or film whereas the second reaction mixture exhibits excellent scratch resistance.