PS version of the composition of the sensitizer

The sensitizer for PS plate is composed of a photosensitive material, a film-forming polymer resin, a dye, and an organic solvent.

For a photosensitive layer coated with a photosensitive agent formulated with a photosensitizer alone, its alkali resistance is strong, the film forming property is poor, and development is difficult; an appropriate amount of phenolic resin is added to the photosensitizer. Although the alkali resistance is poor, the film forming property and the adsorptivity are improved, and the ratio of both is 0.5:1 or 0.62:1. If there are few photosensitizers and there are many film-forming resins, the alkali resistance is reduced and the dots are easily lost. The low residual film rate directly reduces the printing plate's resistance to printing force.

Source: Chenyi Online