Photopolymerisation process with two exposures of a single layer

Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Forming nonplanar surface

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430270, 430281, 430394, 20415914, 20415922, G03C 500

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active

044408501

ABSTRACT:
A layer of a liquid composition containing a compound (A) having in the same molecule at least one (meth)acryloyl group and at least one bicyclo[2.2.1]hept-2-ene-6-yl unit is exposed to actinic radiation so that the layer solidifies due to photopolymerisation of (A) through the (meth)acryloyl group(s), remaining, however, photocrosslinkable. When desired, the solidified layer is exposed, as through a negative, to a substantially greater amount of actinic radiation, the parts so further exposed becoming more highly photocrosslinked through the bicyclo[2.2.1]hept-2-ene-6-yl unit(s) and hence insoluble. An image is produced which can be developed by means of suitable solvents. Examples of (A) include 3-(methacryloyloxy)-2-hydroxypropyl bicyclo[2.2.1]hept-2-ene-6-carboxylate and 2-(acryloyloxy)ethyl methyl-5-carboxybicyclo[2.2.1]hept-2-ene-6-carboxylate.

REFERENCES:
patent: 3926642 (1975-01-01), Breslow et al.
patent: 4106943 (1978-01-01), Ikeda et al.
patent: 4107174 (1978-01-01), Baumann et al.
patent: 4163763 (1979-01-01), Tsuchiya et al.
patent: 4291118 (1981-01-01), Boduch et al.
Research Disclosure, Oct. 1972, No. 10234.
Research Disclosure, Dec. 1980, No. 20012.
D. R. Arnold et al., "Photochemistry", Academic Press, 1974, p. 170.

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