Photo-imaging utilizing alkali-activated photopolymerizable comp

Details Photo-imaging utilizing alkali-activated photopolymerizable comp Photo-imaging utilizing alkali-activated photopolymerizable comp

1972-09-25

1977-03-15

Brammer, Jack P.

Gas separation: apparatus

Electric field separation apparatus

Electrode cleaner, apparatus part flusher, discharger, or...

96115P, 96 27R, G03C 500, G03C 168

Patent

active

040122565

ABSTRACT:
A photopolymerizable composition useful in photo-imaging processes comprises an ethylenically unsaturated polymerizable compound and a photo-initiator comprising a combination of a photoreducible dye and an alkanolamine. The composition is substantially insensitive to visible light when in an acidic pH condition, yet may be made highly sensitive to visible light upon adjustment to a condition of alkaline pH. Imaging materials may be repeatedly sensitized and desensitized by pH adjustment and multiple-spaced exposures made prior to final washoff development processing.

REFERENCES:
patent: 3097097 (1963-07-01), Oster et al.
patent: 3418118 (1968-12-01), Thommes et al.
patent: 3495987 (1970-02-01), Moore
Chaberek et al, "The Journal of Physical Chemistry", vol. 69, No. 2, Feb. 1965, pp. 647-656.

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