Lithography is an important technique for the elecronic industries. In the manufacture of a semiconductor and a liquid crystal display (LCD), photoresist is used as a key photo sensitive material. An example is a phenolic as a base resin that controls photoresist characters and plays an active part in the electronic industries. This review describes the results of investigation on the published reports and patents which are concerned with the phenolic photoresists. Kettle materials for a reaction vessel are also introduced for obtaining a specific phenolic resin which is controlled to an extremely low metal content of ppb level, and manufacturing methods for obtaining a phenolic resin with low-dispersed molecular weight.
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