Abstract: This invention provides a novel industrial process for preparation of an anhydride of 2-(2-aminothiazole-4-yl)-2-hydroxy compound.

Abstract: This invention provides a novel industrial process for preparation of an anhydride of 2-(2-aminothiazole-4-yl)-2-hydroxy compound.

Abstract: Novel aromatic sulfonium compounds of general formula (I), photoacid generators comprising the same, and photopolymerizable compositions containing the same, capable of providing stereolithographic resin compositions which do not suffer from the hindrance to curing by oxygen, can easily give shaped articles having desired sizes by virtue of the high accuracy thereof in curing, and can attain a satisfactory curing depth owing to the high sensitivity thereof for radiant energy; and a stereolithographic process.

Abstract: The energy beam curable epoxy resin composition comprising as essential components, (1) specific cationically polymerizing organic substance,(2) energybeam sensitive cation polymerization initiator, (3) cationically polymerizing organic substance except for the specific cationically polymerizing organic substance, described above, (4) radically polymerizing organic compound, and (5) energy beam sensitive radical polymerization initiator. The cured articles resulted from said resin composition, have superior properties and particularlly superior dimensional stability on humidity absorption. Therefore, a stereolithographic resin composition and a stereolithographic method are also provided.

Abstract: The stereolithographic resin composition comprising,(1)a catinically polymerizing organic compound, (2)an energy beam sensitive cationic polymerization initiator, and (3)a thermoplastic polymer compound which uniformly dissolves in said resin composition was provided. Therefore, the process for optical solid molding, which enabled the production of highly precise solid shape, was provided using said resin composition.

Abstract: The energy beam curable epoxy resin composition comprising as essential components, (1) specific cationically polymerizing organic substance, (2) energybeam sensitive cation polimerization initiator, (3) cationically polymerizing organic substance except for the specific cationically polymerizing organic substance, described above, (4) radically polymerizing organic compound, and (5) energy beam sensitive radical polymerization initiator. The cured articles resulted from said resin composition, have superior properties and particularlly superior dimensional stability on humidity absorption. Therefore, a stereolithographic resin composition and a stereolithographic method are also provided.

Abstract: The present invention relates to a resin composition for optical molding which comprises (a) an actinic radical-curable and cationically polymerizable organic substance and (b) an actinic radiation-sensitive initiator for cationic polymerization. This composition can be cured without being affected by atmospheric oxygen.

Abstract: The present invention relates to a resin composition for optical molding which comprises (a) an actinic radical-curable and cationically polymerizable organic substance and (b) an actinic radiation-sensitive initiator for cationic polymerization. This composition can be cured without being affected by atomospheric oxygen.

Abstract: An actinic radiation-reactive pressure-sensitive adhesive composition which can be cured in air at a high speed, without irritation and bad smell, comprises1 a pressure-sensitive adhesive compound comprising an acrylate copolymer and2 an actinic radiation-curable resin comprising (1) one or more polythiol compounds and (2) one or more polyene compounds each having an least two actinic radiation-reactive acrylate carbon-to-carbon double bonds in the molecule.

Abstract: An actinic radiation-reactive pressure-sensitive adhesive composition can be cured in air at a high speed, without irritation and bad smell, and comprises1 a pressure-sensitive adhesive organic compound, and2 an actinic radiation-curable resin comprising (1) one or more polythiol compounds and (2) one or more polyene compounds each having at least two actinic radiation-reactive carbon-to-carbon double bonds in the molecule.

Abstract: An optical molding composition is used for casting and does not cause irritation to the skin or possess a bad smell. This composition comprises1. an actinic radiation-curable, radical-polymerizable organic compound comprising(1) one or more polythiol compounds and(2) one or more polyene compounds each having at least two actinic radiation-reactive carbon-to-carbon double bonds in the molecule, and2. an actinic radiation-sensitive radical polymerization initiator.

Abstract: Disclosed is a photographic element having a support, at least one layer for carrying an image on the support and a protective coated layer cured by an active energy ray thereon, wherein the protective coated layer is one obtained by curing, by irradiation of an active energy ray, an active energy ray curable composition containing a prepolymer containing at least 2 epoxy groups in the molecule and a polymerization initiator which can be activated by the active energy ray; and the active energy ray curable composition is coated on the layer carrying the image; and the layer carrying the image has a water content of 20.0% by weight or less. Disclosed is also a process for preparing the photographic element constituted as the above.

Abstract: There is provided an energy beam curable resin composition which comprises as an essential component a cationically polymerizable substance and an effective amount of an onium salt of a Lewis acid represented the following formula (I). ##STR1## [where X is a sulfonio group represented by the following formula (II)]. ##STR2## (where at least one of R.sub.1 -R.sub.10 is (A) a C.sub.1 -C.sub.18 aliphatic group having at least one hydroxyl group or (B) a C.sub.3 -C.sub.19 aliphatic group having a group of --OCH.sub.2 CH.sub.2 O--).