Process for the manufacture of moulded articles that are partly colored or have regions of different colors

US6042756A · kind A · utility

Assignee

• Novartis AG · CH

Inventors

• Achim Müller · Aschaffenburg, DE
• Bernhard Seiferling · Goldbach, DE
• Axel Heinrich · Aschaffenburg, DE

Key dates

• Filing date: Jul 30, 1997
• Grant date: Mar 28, 2000
• Expiry date: Jul 30, 2017

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29L2011/0016
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

For the fast and rational manufacture of moulded articles, specifically contact lenses, that are partly colored or have regions of different colors, by the casting process, measured amounts of two or more crosslinkable materials of different colors are introduced into the casting mould in the uncrosslinked stated unmixed and, after closing the casting mould, are crosslinked together. By suitably controlling the introduction of the different crosslinkable materials with regard to location and/or time the merging of the colors and the transitions between the colors in the contact lens are influenced in a controlled manner.