Abstract: A thiol carboxylate ester as shown by general formula (I) below, which has a half ester content of 0.0001 to 2 mass %, and favorably, which has a halogen content of not more than 2 mass % and/or to which a polymerization inhibitor such as a catechol family member is added.

Abstract: A thiol carboxylate ester as shown by general formula (I) below, which has a half ester content of 0.0001 to 2 mass %, and favorably, which has a halogen content of not more than 2 mass % and/or to which a polymerization inhibitor such as a catechol family member is added.

Abstract: A process for producing zinc oxide fine particles comprising heating a mixture comprising a zinc source, a carboxyl-containing compound, and an alcohol; a process for producing zinc oxide-polymer composite particles, which comprises heating a mixture comprising a zinc source, a carboxyl-containing compound, a polymer, and an alcohol at a temperature of 100° C. or higher; a process for producing inorganic compound particles having on their surface a cluster of thin plate like zinc oxide crystals with their tip projecting outward, which comprises heating a mixture comprising a zinc source, a carboxyl-containing compound, lactic acid or a compound thereof, and an alcohol at a temperature of 100° C.

Abstract: A flash fixing toner comprising a binding resin, a coloring agent, and an infrared absorbent, the infrared absorbent having the largest absorption wavelength in the range of 750-1100 nm, and the infrared absorbent being solved in or being finely dispersed in the binding resin.

Abstract: A method which produces colored minute particles by suspending in an aqueous suspending medium a polymerizable monomer composition obtained by dispersing a coloring agent at least in a polymerizable monomer and polymerizing the resultant suspension is characterized in that the dispersion of the coloring agent in the polymerizable monomer is performed in the presence of a dispersing agent, the polymerizable monomer composition exhibits a viscosity of not more than 300 cP, and the suspension of the polymerizable monomer composition in the aqueous suspending medium exhibits a viscosity of not more than 100 cP. The dispersing agent is at least one resin selected from the group consisting of rosin derivatives, aromatic petroleum resins, pinene type resins, epoxy type resins, cumdrone resins, and styrene-acryl type resins.

Abstract: A static charge developing toner excelling in resistance to offset and low-temperature fixing property and using as at least part of a binder resin component an epoxy resin-including binder resin which is obtained by polymerizing a polymerizable monomer in the presence of an epoxy resin.

Abstract: A carbon black graft polymer which excels in stability of dispersion in various media, coloring property, and imperviousness to light is obtained by mixing under heating a block- or graft-copolymer having a segment (A) containing a reactive group capable of reacting with a functional group on the surface of carbon black and a segment (B) different in skeletal structure from the segment (A) with carbon black. The carbon black graft polymer, by causing the graft chain thereof to incorporate therein an ethylenically unsaturated double bond and/or a carboxyl group, is enabled to manifest photosensitivity, developability with an alkali, and insulating property and acquire usefulness for a black photocurable resin composition such as, for example, the material for the formation of a black matrix particularly in a color filter.

Abstract: A process for preparing an aqueous resin dispersion includes the steps of copolymerizing a polymeric monomer whose ratio of (meth) acrolein to a total amount of the (meth) acrolein and a vinyl monomer is in the range from 10 weight % to 80 weight % in an organic solvent to obtain a copolymer solution, dispersing the obtained copolymer solution in an aqueous medium and removing an unreacted (meth) acrolein. Since the above process can extremely reduce contents of the unreacted (meth) acrolein and of an oligomer whose number-average molecular weight is less than 1000, an aqueous resin dispersion where problems of a pungent smell, toxicological properties, etc. due to the (meth) acrolein and the oligomer are eliminated can be provided.

Abstract: A thermosensitive recording material comprising a recording layer formed on a substrate and a coating film layer formed thereon, wherein the recording layer is of a bilayer structure composed of a first thermosensitive layer on the side of the lower layer and a second thermosensitive layer on the side of the upper layer and particles are dispersed in at least one of the first and second thermosensitive layers. An original plate for lithographic printing can be produced from a combination of an ink-philic resin and an ink-repelling resin as the compositional materials of such thermosensitive layers. Besides, thermosensitive, recording materials for magnetic recording, thermosensitive materials for electrostatic recording, thermosensitive recording materials for colored image recording and the like, can be generated through a variety of modifications of the compositional materials.

Abstract: Provided herein are a copolymer obtained by copolymerizing at least an ultraviolet-stable polymerizable monomer and a cycloalkyl group-containing polymerizable monomer, a process for producing said copolymer, and a coating composition containing said copolymer. The copolymers retains outstanding weather resistance over a long period of time owing to the multiplicated effect of an ultraviolet-stable monomer and a cycloalkyl group-containing polymerizable monomer, and the coating composition containing the copolymer forms a coating film having superior gloss, buildability, solvent resistance, and chemical resistance.

Abstract: The present invention discloses an optical material having excellent transparency, impact resistance and heat resistance and having a low specific gravity and a high refractive index comprising a resin obtained by radical polymerization of specific difunctional (meth)acrylate (A) and aromatic vinyl monomer (B) and, if necessary, polymerizable monomer (C) copolymerizable with the ingredients (A), or (B) or by radical polymerization of the ingredients (A), (B) and (C) under the presence of a radical polymerizable or not-radical polymerizable compound having alkoxysilyl group, epoxy group, alcoholic hydroxy group or carboxyl group in the molecule, an optical molding product comprising the optical material, as well as production process therefor. The optical molding product is utilized as for ophthalmic lenses or lenses for various kinds of optical equipments, prisms, optical fibers, optical waveguides and optical discs.

Abstract: A resin having a low specific gravity, an excellent impact resistance and a high refractive index can be produced by radical polymerization of a polymerizable monomer mixture composed essentially of [I] at least one polymerizable monomer selected from the group consisting of specific polyfunctional (meth)acrylates, [II] at least one polymerizable monomer selected from the group consisting of styrene and alpha-methylstyrene, and [III] at least one polymerizable monomer selected from the group consisting of unsaturated nitriles. This invention provides an optical material composed of said resin, especially, a lens.

Abstract: A process for producing a resin having a high refractivve index which comprises radically polymerizing a material monomer, characterized in that said material monomer comprises [I] at least one polymerizable monomer selected from the group consisting of a polyfunctional thioacrylate and a polyfnctional thiomethacrylate (as an indispensable component), and optionally [II] at least one other polymerizable monomer which is radically polymerizable with said polymerizable monomer [I], a resin having a high refractive index produced by said process and optical materials, especially lenses and disk substrates prepared from said resin.

Abstract: Thiolcarboxylic acid esters represented by the general formula ##STR1## wherein X represents --CH.sub.2 CH.sub.2 --, ##STR2## and n and m represent an integer of 1 to 3.