Abstract
A novel water-dispersible reactive microgel, which had a diameter of 40–90 nm, was synthesized for photopolymer materials. The microgels have segments with substituted ammonium groups, to provide water solubility, in their polymer networked structure. It has unsaturated groups connected to the quaternary nitrogens by ionic bonding (I-type microgel). The I-type microgel was compared with one that has methacryloyl groups connected with the quaternary nitrogens of the microgel by covalent bonding (C-type microgel). The I-type microgels were able to separately control the modified amount of quaternary nitrogen and methacryloyl group. In the presence of 2,4-diethylthioxantone as a photoinitiator and pentaerthritol triacrylate as a crosslinker, the photopolymer containing the C-type or I-type microgels had sensitivity high enough for practical use. Not only the amount of the methacryloyl group of the microgel but the amount of the quaternary nitrogen affected the sensitivity and the rate of polymerization of the water-dispersible photopolymer containing the I-type microgels. Copyright © 2000 John Wiley & Sons, Ltd.
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