Patent ID: 6045953
Filing Date: 2000-04-04
Classification: G03F,G03H

Abstract:
A photosensitive recording material for the production of a volume type phase hologram, which comprises:an alicyclic, solvent-soluble, cationic-polymerizable thermosetting epoxy oligomer represented by the following formula, ##STR6## wherein n is a polymerization degree of from 5.6 to 20, and having an epoxy equivalent weight of from 1000 to 6,000;an aliphatic radical-polymerizable monomer having at least one ethylenically unsaturated bond, the aliphatic monomer being liquid at normal temperature and pressure and having a boiling point of 100.degree. C. or above at normal pressure;a photoinitiator system selected from the group consisting of i) a first photoinitiator compound which simultaneously generates a radical species that activates radical polymerization and a Br.o slashed.nsted acid or Lewis acid that activates cationic polymerization, upon exposure to a visible light ray in the presence of a spectral sensitizer and upon subsequent sensitization by the action of the sensitizer, and ii) a second photoinitiator comprised of a mixture of a radical polymerization photoinitiator which generates a radical species that activates radical polymerization upon exposure to the visible light ray in the presence of the spectral sensitizer and upon subsequent sensitization by the action of the sensitizer, and a cationic polymerization photoinitiator which generates a Br.o slashed.nsted acid or Lewis acid that activates cationic polymerization upon exposure to the visible light ray in the presence of the spectral sensitizer and upon subsequent sensitization by the action of the sensitizer;said spectral sensitizer acting to absorb said visible light ray and to sensitize said first photoinitiator compound or said second photoinitiator; andsaid aliphatic monomer being mixed in an amount of from 20 parts by weight to 80 parts by weight based on 100 parts by weight of said alicyclic thermosetting epoxy oligomer.