Diazo- General, Process, Functions, Company Profiles, Consultants, Technology, Products, Suppliers, Report

General

Diazo refers to a type of organic compound that has two linked nitrogen (azo) compounds.
The general formula is R2C=N2. The simplest example of a diazo compound is diazomethane.
The electronic structure of diazo compounds involves a positive charge on the central nitrogen and negative charge distributed between the terminal nitrogen and the carbon.
Diazo compounds are not dyes, but dye precursors. Some azo dyes are manufactured by coupling a phenol or naphthol to a diazonium compound.

Process

The 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.
Diazo production uses aqueous ammonia to destroy the stabilizer incorporated in the material, in turn enabling the dyes to couple with the diazonium salts.
The 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.
The 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.

Applications

Diazo 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 plates.
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 applications.

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