INVESTIGATION OF THE PHOTOPOLYMERIZATION PROCESS
Abstract
A photopolymerizable composition on paper base containing the light-se sitive ferric salt of meta-hydroxymandelic acid produces a greenishblack resist during immersion in H2O2. Intensity of color obtained is proportional to the period of exposure. Durohydroquinone acts as a percompound substitute in photopolymerizable solutions and coated lay rs. It behaves as such in both acid and alkaline solution, but converts O into H2O2 only at pH 8 and above. Stable photopolymerizable compositions containing both ceric oxalate and manganic oxalate were prepared. Requirements include (a) a binder free of hydroxyl groups, i.e., polyvinylpyrrolidone and (b) t ubstitution of K oxalate for oxalic acid in the formulation. Comparisons were made of minimum exposure times required to produce resists with different bi ders. Shorter exposure periods were requir for hydro yet yl cellulose coati gs t an for gelatin coatings--independent of the photocatalyst. The dry photopolymer printout system containing a polymer precipitant can be stabilized after image-wise exposure by several techniques. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 14, 1962
- Accession Number
- AD0277673
Entities
People
- Edward Cerwonka
Organizations
- GAF