Patent ID: 6337409
Filing Date: 2002-01-08
Classification: C09K,G02B

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 group; 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 group, provided that at least one substituent of at least one substituted phenyl or substituted naphthyl at either A or B is phenyl, naphthyl, or furyl.