Abstract: A photosensitive resin composition which is excellent in storage stability required for one-part type compositions and in processability required for dry-film formation and gives a cured product suitable for FPC substrates or suspension substrates for hard-disc which each retains essential properties required for solder resists, such as heat resistance, water resistance, and electrical-insulation reliability, and has flexibility and low polluting property. The composition comprises: a compound which has a carbon-carbon double bond and carboxy group and is obtained by allowing a bisphenol type epoxy compound and an unsaturated monocarboxylic acid to react and then allowing a polybasic acid anhydride to undergo addition reaction with part or all of the secondary hydroxy groups of the reaction product; a urethane (meth)acrylate compound having a structure derived from a polycarbonate polyol structure; another polymerizable compound having a carbon-carbon double bond; and a photopolymerization initiator.

Abstract: A photosensitive resin composition which is excellent in storage stability required for one-part type compositions and in processability required for dry-film formation and gives a cured product suitable for FPC substrates or suspension substrates for hard-disc which each retains essential properties required for solder resists, such as heat resistance, water resistance, and electrical-insulation reliability, and has flexibility and low polluting property. The composition comprises: a compound which has a carbon-carbon double bond and carboxy group and is obtained by allowing a bisphenol type epoxy compound and an unsaturated monocarboxylic acid to react and then allowing a polybasic acid anhydride to undergo addition reaction with part or all of the secondary hydroxy groups of the reaction product; a urethane (meth)acrylate compound having a structure derived from a polycarbonate polyol structure; another polymerizable compound having a carbon-carbon double bond; and a photopolymerization initiator.

Abstract: The present invention relates to a process for producing a metal oxide catalyst which is suitable for production of acrylic acid or acrylonitrile in one stage by a catalytic oxidation reaction of propane in a high yield. The present invention is characterized by using a fine particle of metallic tellurium obtained by reducing a Te compound with a reductant as a raw material for producing an oxide catalyst including metal elements Mo—V—Nb—Te. The fine particle of metallic tellurium is preferably one containing primary particles having a particle size of not more than 4.0 ?m. By using a metal oxide obtained by the process of the present invention, acrylic acid can be produced from propane by a one-stage oxidation reaction in a higher yield not less than 40%.

Abstract: The invention relates to a process for producing a metal oxide catalyst capable of producing acrylic acid, acrylonitrile or the like in one stage by catalytic oxidation reaction of propane in a high yield. The invention is characterized by using one obtained by finely ground metallic Te or metallic Sb in water or an organic solvent as a raw material for the production of an oxide catalyst made of metal elements Mo—V—Nb—Te or metal elements Mo—V—Nb—Sb. The powder of the metallic Te or metallic Sb obtained by grinding preferably has a mode size of not more than 20 ?m. By using the metal oxide obtained by the invention as a catalyst, it is possible to produce acrylic acid in a high yield of 35% or more from propane by a one-stage oxidation reaction.

Abstract: The present invention relates to a process for producing a metal oxide catalyst which is suitable for production of acrylic acid or acrylonitrile in one stage by a catalytic oxidation reaction of propane in a high yield. The present invention is characterized by using a fine particle of metallic tellurium obtained by reducing a Te compound with a reductant as a raw material for producing an oxide catalyst including metal elements Mo-V-Nb-Te. The fine particle of metallic tellurium is preferably one containing primary particles having a particle size of not more than 4.0 ?m. By using a metal oxide obtained by the process of the present invention, acrylic acid can be produced from propane by a one-stage oxidation reaction in a higher yield not less than 40%.

Abstract: The invention relates to a process for producing a metal oxide catalyst capable of producing acrylic acid, acrylonitrile or the like in one stage by catalytic oxidation reaction of propane in a high yield. The invention is characterized by using one obtained by finely ground metallic Te or metallic Sb in water or an organic solvent as a raw material for the production of an oxide catalyst made of metal elements Mo—V—Nb—Te or metal elements Mo—V—Nb—Sb. The powder of the metallic Te or metallic Sb obtained by grinding preferably has a mode size of not more than 20 ?m. By using the metal oxide obtained by the invention as a catalyst, it is possible to produce acrylic acid in a high yield of 35% or more from propane by a one-stage oxidation reaction.

Abstract: A process for preparing a metal oxide catalyst for acrylic acid production which comprises calcining a metal compound mixture at 400° C. or higher to prepare a metal oxide powder comprising Mo, V, Sb, and at least one element selected from the group consisting of Nb and Ta, and supporting a compound comprising at least one element selected from the group consisting of Sb, Tl, Se, As, Pb, Sn, Ag, Cu, Ru, and Rh on the metal oxide powder, and a process for producing acrylic acid by gas phase oxidation of propane using the catalyst.

Abstract: A process for preparing a metal oxide catalyst for acrylic acid production which comprises calcining a metal compound mixture at 400° C. or higher to prepare a metal oxide powder comprising Mo, V, Sb, and at least one element selected from the group consisting of Nb and Ta, and supporting a compound comprising at least one element selected from the group consisting of Sb, Tl, Se, As, Pb, Sn, Ag, Cu, Ru, and Rh on the metal oxide powder, and a process for producing acrylic acid by gas phase oxidation of propane using the catalyst.

Abstract: A process for preparing a metal oxide catalyst for acrylic acid production which comprises calcining a metal compound mixture at 400° C. or higher to prepare a metal oxide powder comprising Mo, V, Sb, and at least one element selected from the group consisting of Nb and Ta, and supporting a compound comprising at least one element selected from the group consisting of Sb, Tl, Se, As, Pb, Sn, Ag, Cu, Ru, and Rh on the metal oxide powder, and a process for producing acrylic acid by gas phase oxidation of propane using the catalyst.

Abstract: A metal oxide catalyst which can produce acrylic acid by a vapor phase catalytic oxidation of propane in high yield and has excellent abrasion resistance is disclosed. The metal oxide catalyst comprises Mo, V, Sb, A (A represents Nb or Ta) and optionally other metals, and is prepared through the following steps (1) and (2): (1) Step of reacting V+5 and Sb+3 at a temperature of 70° C. or higher in the presence of Mo+6 in an aqueous medium, and bubbling an oxygen-containing gas into the reaction solution during or after the reaction; and (2) Step of adding to the reaction product obtained in step (1) a solution containing a compound comprising A and an aqueous solution of nitric acid or ammonium nitrate, uniformly stirring these components, and then calcining the resulting mixture.

Abstract: A metal oxide catalyst which can produce acrylic acid by a vapor phase catalytic oxidation of propane in high yield and has excellent abrasion resistance is disclosed.

Abstract: A metal oxide catalyst which can produce acrylic acid by a vapor phase catalytic oxidation of propane in high yield and has excellent abrasion resistance is disclosed. The metal oxide catalyst comprises Mo, V, Sb, A (A represents Nb or Ta) and optionally other metals, and is prepared through the following steps (1) and (2): (1) Step of reacting V+5 and Sb+3 at a temperature of 70° C. or higher in the presence of Mo+6 in an aqueous medium, and bubbling an oxygen-containing gas into the reaction solution during or after the reaction; and (2) Step of adding to the reaction product obtained in step (1) a solution containing a compound comprising A and an aqueous solution of nitric acid or ammonium nitrate, uniformly stirring these components, and then calcining the resulting mixture.

Abstract: A process for producing acrylic acid or methacrylic acid by reacting acetic acid or propionic acid with formaldehyde in a gas phase is described, characterized by carrying out the reaction in the presence of a solid catalyst containing at least one of boron oxide or phosphorus oxide and having an acid site of an acid strength, pKa.ltoreq.-3.0. The solid catalyst is of high activity and is satisfactory in both selectivity and conversion and, furthermore, its high selectivity can be maintained for long periods of time. Thus the desired product, acrylic acid or methacrylic acid, can be produced in high yield.

Abstract: A heat exchanger adapted for use as a hot water radiator for a car heater, or the like, in which a plurality of tubes and a plurality of fins secured thereon extend between two fluid tanks. The fluid tanks each comprise an inner and an outer tank element, both made of synthetic resin. The inner tank element is joined via gaskets with the end portions of the tubes extending therethrough, by means of tube-expansion working, while the outer tank element is united with the inner tank element along corresponding opposed peripheral edges thereof arranged in abutting relation. A pair of partition walls are provided in opposed relation between the inner and outer tank elements, which are joined together in an abutting manner directly or via part of the gasket, to provide a fluid tight partition between an inlet chamber and an outlet chamber defined by the partition walls and the tank elements.