Process and device for the manufacture of mouldings

US5782460A · kind A · utility

Assignee

• CIBA Vision Corporation · US

Inventors

• Otto Kretzschmar · Lorsch, DE
• Sharla Borghorst · Frankfurt am Main, DE
• John Golby · Aschaffenburg, DE
• Peter Hagmann · Erlenbach a.Main, DE
• Peter Herbrechtsmeier · Königstein, DE
• Bernhard Seiferling · Goldbach, DE
• Beat Muller · Marly, CH

Key dates

• Filing date: Aug 13, 1996
• Grant date: Jul 21, 1998
• Expiry date: Aug 13, 2016

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S425/808
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

In a process for the manufacture of mouldings, especially optical lenses, specifically contact lenses (CL), a starting material that is crosslinkable by the impingement of suitable energy is introduced into a mould (1) having a cavity (15), which mould is at least partially permeable to the energy concerned. The starting material is introduced into the cavity in a still at least partially uncrosslinked state, the mould cavity determining the shape of the moulding (CL) to be produced. By means of impingement of the energy concerned, the starting material is crosslinked to an extent sufficient for it to be possible for the moulding (CL) to be released from the mould. The filling of the mould cavity is carried out in the starting material that is still at least partially in the uncrosslinked state.