Red-Light-Sensitive Photopolymers Initiated by a Combined System of Radical Generator and Souarilium Dve Sensitizer

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  • KOSEKI Ken'ichi
    Department of Information and Image Sciences, Faculty of Engineering, Chiba University

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  • スクアリリウム色素を分光増感剤とする赤色感光性光重合型フォトポリマー
  • スクアリリウム シキソ オ ブンコウ ゾウカンザイ ト スル セキショク カンコウセイ ヒカリ ジュウゴウガタ フォト ポリマー

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Abstract

The photographic properties of photopolymerizable composites initiated by a combined system of radical generator and spectral sensitizer were investigated under 630-nm-light exposure. The photopolymerizable layer consists of four components : matrix polymer, multifunctional monomer, radical generator, and squarilium dye sensitizer. The dye exhibits an absorption maximum at 633nm. Scince radical generators, such as 2,4,6-tris (trichloromethyl) -s-triazine (TCT) and organic peroxide, show sensitivity only in the ultraviolet region, they are difficult to be used as photoinitiators of red-light-sensitive imaging materials. However, the addition of a squarilium dye extended the range of spectral sensitivity toward longer wavelength. The sensitivity to 633 nm He-Ne laser of the photopolymer initiated by TCT sensitized with squarilium dye was 0.5 mJ/cm2. Moreover, the photosensitivity was increased by approximately one order of magnitude by using such matrix polymers as poly (vinylpyrrolidone). The sensitization of the radical generator by the dye involves electron transfer from the excited dye to the radical generator. A Lippmann hologram was recorded with the photopolymer initiated by the dye-sensitized system. The holographic properties were evaluated in terms of the wavelength dependence of the diffraction efficiency. The hologram exhibited high diffraction efficiency and good resistance to humidity.

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