Copolymers comprising propellanes and contact lenses made therefrom

US5362767A · kind A · utility

Assignee

• Ciba-Geigy · US

Inventors

• Peter Herbrechtsmeier · Königstein, DE
• Horst Schafer · Aschaffenburg, DE
• Bernhard Seiferling · Goldbach, DE
• Arnulf-Dieter Schluter · Berlin, DE
• Harald Bothe · Niedernhausen, DE
• Rainer Freudenberger · Niederwalluf, DE

Key dates

• Filing date: Oct 14, 1992
• Grant date: Nov 8, 1994
• Expiry date: Oct 14, 2012

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B1/043
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to contact lenses made from a copolymer comprising units of formula I ##STR1## wherein R.sup.1 and R.sup.2 are each independently of the other hydrogen, alkyl, alkoxyalkyl, organosilylalkyl or organosilyl, R.sup.3 and R.sup.4 are each hydrogen or, taken together, are a divalent alkylene radical containing up to 8 carbon atoms, and A is a divalent substituted 1,2-ethylene radical which is derived from a copolymerisable vinyl monomer by virtue of the vinyl double bond being replaced with a single bond. The invention further relates to the copolymers themselves, to the use thereof for making contact lenses, and to a process for making contact lenses from such copolymers.