Optically transparent photochromic plastic material

US5498686A · kind A · utility

Assignee

• Optische Werke G. Rodenstock · DE

Inventors

• Erhard Effer · Pöcking, DE
• Manfred Melzig · Weßling, DE
• Herbert Schuster · Grafing, DE
• Guiseppe Martinuzzi · Eichenau, DE

Key dates

• Filing date: Dec 9, 1994
• Grant date: Mar 12, 1996
• Expiry date: Dec 9, 2014

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B1/041
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

An optically transparent photochromic plastic material is described which is comprised of materials with a sulphur content and which via polymerization processes contains photochromic organic compounds as solid ingredients, which possess at least two ring systems linked via carbon atom and whose photochromic tint is based on a reversible bond rupture to the spiro-C atom.