Photochromic naphthopyran compounds

US6337409B1 · kind B1 · utility

Assignee

• Vision-Ease Lens · US

Inventors

• Frank J. Hughes · Edina, US
• Edward A. Travnicek · Southbridge, US

Key dates

• Filing date: Jul 28, 1994
• Grant date: Jan 8, 2002
• Expiry date: Jul 28, 2014

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B5/23
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A naphthopyran compound represented by the formula: wherein R4, R5, R6, R7, R8, R9, R10, and R11 are each selected from the group consisting essentially of hydrogen, a first stable organic radical, a heterocyclic group, halogen, a first nitrogen-substituted group, and a first nitrogen-substituted ring compound; A and B are each selected from the group consisting essentially of hydrogen, substituted phenyl, and substituted naphthyl, provided that at least one of A or B is substituted phenyl or substituted naphthyl; and any substituent of any substituted phenyl or substituted naphthyl at A or B is selected from the group consisting essentially of hydrogen, a second stable organic radical, a heterocyclic group, halogen, a second nitrogen-substituted group, and a second nitrogen-substituted ring compound, provided that at least one substituent of any substituted phenyl or substituted naphthyl at either A or B is phenyl, naphthyl, or furyl.