INVESTIGATION OF THE PHOTOPOLYMERIZATION PROCESS.
Quarterly rept. no. 11, 14 Sep-13 Dec 65,
GENERAL ANILINE AND FILM CORP BINGHAMTON N Y PHOTO AND REPRO DIV
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Phenol sulphonphthalein and cyanine dyes were found to be sensitizers for zinc oxide photoconductive coatings. Coatings sensitized with Rose Bengal, Eosin Y, Bromophenol Blue and Bromocresol Green exhibited two photocurrent peaks, with a total exposure time of 3 to 4 seconds in the fastest systems. Higher photocurrents are produced in a system containing a monomer composition on a aluminum instead of only an aluminum sheet as counterelectrode. Sensitivity of the sandwich was doubled when zinc oxide coatings were sensitized with Rose Bengal and Bromophenol Blue. An imagewise resist is produced using sodium nitrate as the electrochemical catalyst, and zinc oxide as the photoconductor. Thinner photoconductive layers generally result in higher speed. Phosphorescent zinc cadmium sulfide did not show any photoconductivity, but a fluorescent variety of this phosphor was weakly photoconductive. Monomer concentration appears to have little or no effect on the speed of the sandwich. Author
- Organic Chemistry