The present invention provides novel azo dye material based on antipyrine azo structure and metal complexes containing such azo compounds which are suitable for optical recording media.The dyes In particular the invention relates to optical layers comprising such dyes to a method for manufacturing such optical layers and to optical recording media comprising such optical layers.(From EP1621584 A1)

The present invention relates to antipyrine based azo metal complex dyes andtheir use in optical layers for optical data recording preferably for opticaldata recording using a laser with a wavelength up to 450 nm. The invention furtherrelates to a write only read many (WORM) type optical data recording medium capableof recording and reproducing information with radiation of blue laser whichemploys an antipyrine based azo metal complex dye in the optical layer.

The present invention relates to antipyrine based azo metal complex dyes andtheir use in optical layers for optical data recording preferably for opticaldata recording using a laser with a wavelength up to 450 nm. The invention furtherrelates to a write only read many (WORM) type optical data recording medium capableof recording and reproducing information with radiation of blue laser whichemploys an antipyrine based azo metal complex dye in the optical layer.