Image-reversal process patterned exposure

The first step in the image-reversal process (Figure 2.3) is patterned exposure. During this exposure, a latent image of photogenerated indene-... 

Figure 2.3. The base-catalyzed image-reversal process involves a patternwise exposure that converts the diazoquinone to the corresponding indenecarboxylic acid, follotved by a bake step that causes base-catalyzed decarboxylation that produces the nonphotosensitive indene derivative. Subsequent flood exposure converts the diazoquinone in the previously unexposed areas of the film into the indenecarboxylic acid. Development then yields a negative image of the mask because the originally patterned areas containing the lipophilic indene derivative are less soluble in base than those containing the...

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