refers to a type of organic compound that has two linked nitrogen (azo)
general formula is R2C=N2. The simplest example of a diazo compound is
electronic structure of diazo compounds involves a positive charge on
the central nitrogen and negative charge distributed between the
terminal nitrogen and the carbon.
compounds are not dyes, but dye precursors. Some azo dyes are
manufactured by coupling a phenol or naphthol to a diazonium compound.
TiCl4-mediated reaction of esters with benzoyl chloride gave
α-benzoylated esters in high yields. Diazo transfer of the α-benzoylated
esters utilizing p-acetoamidobenzenesulfonyl azide afforded α-diazo
esters in good yields. This procedure allows the preparation of α-diazo
esters in gram quantities.
production uses aqueous ammonia to destroy the stabilizer incorporated
in the material, in turn enabling the dyes to couple with the diazonium
techniques employed in the production of diazo sensitised copying
materials comprise: unwinding a reel of the base material; applying the
appropriate chemical solutions in a coating machine; removing any excess
solution while the material is passing through the machine; drying the
coated materials in ovens which form part of the machine; re-reeling the
dry coated material; converting the coated reel into rolls or sheets.
combination of a new high-speed process and developer unit which uses
pressurized anhydrous ammonia gas offers a significant increase in the
speed of developing diazo photomaterials.
compounds are used as precursors to carbenes, which are generated by
thermolysis or photolysis.
Water-soluble multifunctional diazo compounds are primarily used as
photosensitive agents for use in screen printing plates and colored
image formation material (e.g. color proof films), whereas organic
solvent-soluble diazo compounds are often used for lithographic printing
Improved photosensitivity to light in the mid UV range can be achieved
using diazo esters of 4-benzyl-1,2,3-trihydroxybenzene. These esters
show surprising solubility in some novolak resin/solvent systems.
ImageMaster IMD-XT is a premium diazo film designed for all PCB
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