Abstract: An object of the present invention is to provide a plasticizer for vinyl chloride-based resin superior in cold resistance and volatility resistance, and desirable in flexibility, fogging resistance, heat discoloration resistance, and weather resistance, and to also provide a vinyl chloride-based resin composition comprising the plasticizer. An ester obtained by reacting a specific carboxylic acid or a derivative thereof with a C9 saturated aliphatic alcohol at a specific proportion is superior in cold resistance and volatility resistance, and desirable in flexibility, fogging resistance, heat discoloration resistance, and weather resistance. Therefore, if becomes possible to obtain a vinyl chloride-based resin composition applicable to automobile parts, medical materials, or the like, as well as a molded article of the vinyl chloride-based resin composition.

Abstract: An object of the present invention is to provide a plasticizer for vinyl chloride-based resin superior in cold resistance and volatility resistance, and desirable in flexibility, fogging resistance, heat discoloration resistance, and weather resistance, and to also provide a vinyl chloride-based resin composition comprising the plasticizer. An ester obtained by reacting a specific carboxylic acid or a derivative thereof with a C9 saturated aliphatic alcohol at a specific proportion is superior in cold resistance and volatility resistance, and desirable in flexibility, fogging resistance, heat discoloration resistance, and weather resistance. Therefore, if becomes possible to obtain a vinyl chloride-based resin composition applicable to automobile parts, medical materials, or the like, as well as a molded article of the vinyl chloride-based resin composition.

Abstract: A relay unit includes a main-system switch and a sub-system switch that are connected to each other via an inter-system line, that are connected to a main-system line and a sub-system line, and that relays a frame; and control sections that control a relay operation of the main-system switch and the sub-system switch. The control sections store information on a number of connections of relay units and information on a connection priority, and select a control aspect of the relay operation of at least one of the main-system switch and the sub-system switch according to the number of connections and the connection priority.

Abstract: A relay unit includes a main-system switch and a sub-system switch that are connected to each other via an inter-system line, that are connected to a main-system line and a sub-system line, and that relays a frame; and control sections that control a relay operation of the main-system switch and the sub-system switch. The control sections store information on a number of connections of relay units and information on a connection priority, and select a control aspect of the relay operation of at least one of the main-system switch and the sub-system switch according to the number of connections and the connection priority.

Abstract: A datagram transmission device whereby processing for performing determination of the transmission destination and transmission using the destination address and processing using information of layers other than the third layer of the protocol are performed by a simple algorithm. A first search function section searches for a transmission control rule using the destination address i.e. third layer information of a received datagram. A second search function section searches for a transmission control rule using information of this datagram other than the third layer. A decision function section inputs the search result of the second search function section and determines a transmission control rule that is contained in all the search results.

Abstract: Disclosed is a process for preparing a diphenyl sulfonetetracarboxylic acid, the process comprising oxidizing a tetramethyldiphenyl sulfone with oxygen or an oxygen-containing gas in an aliphatic monocarboxylic acid having 2 to 10 carbon atoms in the presence of a catalyst consisting essentially of a cobalt component, a manganese component and a bromine compound wherein the weight ratio of manganese metal to cobalt metal is in the range of approximately 0.01 to 0.5.

Abstract: Disclosed is a method for purifying a crude diphenylsulfone tetracarboxylic acid which comprises the steps of dissolving a crude diphenyolsulfone tetracarboxylic acid in a solvent mixture of water and acetic acid and recrystallizing the crude to obtain a highly purifed diphenylsulfone tetracarboxylic acid.

Abstract: In preparing a diarylsulfone by condensing sulfuric acid or an aromatic sulfonic acid with an aromatic compound having at least one replaceable hydrogen atom on the aromatic ring, the process of the present invention is characterized in that the condensation reaction is carried out in the presence of at least one catalyst selected from the group consisting of a tungstic acid, molybdic acid and heteropoly acid thereof.