Abstract: A hydrogenated NBR composition, which comprises 100 parts by weight of a blend of a hydrogenated NBR having an acrylonitrile content of 25-44% by weight and an iodine number of 32-65, with such an amount of an NBR as to make the iodine number of the blend of 40-160, 2-23 parts by weight of an ester-based plasticizer, and 0.5-10 parts by weight of an organic peroxide, preferably which further contains 0.5-10 parts by weight of a polyfunctional, unsaturated compound, has a distinguished cost performance because of blending an expensive hydrogenated NBR with a cheap NBR, can give cross-linked products having a distinguished oil resistance (resistance to such oil as No. 3 oil and other general-purpose, commercially available engine oil, etc.) and a distinguished fuel oil resistance (resistance to such fuel oil as fuel oil C, and other general-purpose, commercially available gasoline, etc.

Abstract: [Problem] To provide an acrylic rubber composition having an improved compression set, having substantially improved product performance, and capable of preventing oil leakage in the above-described cycle tests. [Means for Solving the Problem] An acrylic rubber composition comprising (A) 100 parts by weight of an acrylic rubber polymer produced by polymerizing principal monomer components containing an alkyl acrylate or an alkoxyalkyl acrylate, butyl acrylate, and a crosslinking site monomer with a functional group, with (B) 40 to 100 parts by weight of a carbon black with an iodine adsorption of 15 to 25 mg/g and a DBP absorption of 120 to 130 cm3/100 g; and (C) 0.2 to 6.0 parts by weight of a crosslinking agent.

Abstract: [Problem] To provide an acrylic rubber composition that has an improved compression set, has substantially improved product performance, can prevent oil leakage in the above-described cycle tests, and has less curing deterioration of the rubber in the above-described curing deterioration tests. [Means for Solving the Problem] An acrylic rubber composition comprising (A) 100 parts by weight of an acrylic rubber polymer produced by polymerizing principal monomer components comprising an alkoxyalkyl acrylate, butyl acrylate, and a crosslinking site monomer with a functional group, with (B) 40 to 100 parts by weight of a carbon black with an iodine absorption of 15 to 25 mg/g and a DBP absorption of 120 to 130 cm3/100 g; and (C) 10 parts by weight or less of a plasticizer.

Abstract: A hydrogenated NBR composition, which comprises 100 parts by weight of a hydrogenated NBR having an acrylonitrile content of 25-44% by weight and an iodine number of 32-65, or a blend of the hydrogenated NBRs themselves, 2-23 parts by weight of an ester-based plasticizer, and 0.5-10 parts by weight of an organic peroxide, and preferably further contains 0.5-10 parts by weight of a polyfunctional unsaturated compound, can give molding products having distinguished oil resistance and fuel oil resistance as well as distinguished heat resistance and cold resistance, and thus can be used as suitable molding materials for intake manifold gaskets of automobile engines.

Abstract: A nitrile rubber solution prepared by dissolving and dispersing into an organic solvent a nitrile rubber composition comprising 100 parts by weight of nitrile rubber, 40 parts by weight or more of carbon black having a DBP oil absorption amount of 30-100 ml/100 g (according to ASTM D1765-91), 15-100 parts by weight of silica having particle sizes of 0.01-0.1 ?m, 0-40 parts by weight of other inorganic filler than the carbon black and silica, and 5-20 parts by weight of an organic peroxide, and preferably further containing 2-10 parts by weight of a silane coupling agent is applied to an adhesive layer on one side or both sides of a metallic sheet, followed by vulcanizing the coated layer, thereby forming a rubber layer.

Abstract: A hydrogenated NBR composition, which comprises 100 parts by weight of a blend of a hydrogenated NBR having an acrylonitrile content of 25-44% by weight and an iodine number of 32-65, with such an amount of an NBR as to make the iodine number of the blend of 40-160, 2-23 parts by weight of an ester-based plasticizer, and 0.5-10 parts by weight of an organic peroxide, preferably which further contains 0.5-10 parts by weight of a polyfunctional, unsaturated compound, has a distinguished cost performance because of blending an expensive hydrogenated NBR with a cheap NBR, can give cross-linked products having a distinguished oil resistance (resistance to such oil as No. 3 oil and other general-purpose, commercially available engine oil, etc.) and a distinguished fuel oil resistance (resistance to such fuel oil as fuel oil C, and other general-purpose, commercially available gasoline, etc.

Abstract: A hydrogenated NBR composition, which comprises a 100 parts by weight of hydrogenated NBR having an acrylonitrile content of 25-45% by weight and an iodine number of 20-65, or a blend of the hydrogenated NBRs themselves, 10-70 parts by weight of furnace black having a nitrogen adsorbable specific surface area of 30-130 (×103 m2/kg), 10-80 parts by weight of thermal black having a nitrogen adsorbable specific surface area of 5-15 (×103 m2/kg), 2-23 parts by weight of an ester-based plasticizer, and 0.5-10 parts by weight of an organic peroxide, and preferably further contains 0.5-10 parts by weight of a polyfunctional unsaturated compound, can give molding products having distinguished oil resistance and fuel oil resistance as well as distinguished heat resistance and cold resistance, even if a hydrogenated NBR having an iodine number of 20 to less than 32, and thus can be used as suitable molding materials for intake manifold gaskets of automobile engines.

Abstract: A hydrogenated NBR composition, which comprises 100 parts by weight of a hydrogenated NBR having an acrylonitrile content of 25-44% by weight and an iodine number of 32-65, or a blend of the hydrogenated NBRs themselves, 2-23 parts by weight of an ester-based plasticizer, and 0.5-10 parts by weight of an organic peroxide, and preferably further contains 0.5-10 parts by weight of a polyfunctional unsaturated compound, can give molding products having distinguished oil resistance and fuel oil resistance as well as distinguished heat resistance and cold resistance, and thus can be used as suitable molding materials for intake manifold gaskets of automobile engines.

Abstract: A radio channel assigning device provided with an assignment request table for detecting the queueing time of data which is queueing in the respective terminal stations, and a channel assignment algorithm controlling the assignment capacity of the communication channels, based on a queueing-time distribution detected by the assignment request table, so as to detect a queueing-time distribution of the transmission data and to cope precisely with the delay time for the respective terminal stations, by processing the transmission data in descending order of a queueing time. Accordingly, the amount of queueing data in the respective terminal stations is not collectively processed, and the terminal station having queueing data whose amount is small as a whole, though its queueing time is long, is capable of being assigned capacity of communication channels.

Abstract: In a radio communication system repeatedly using the same frequency, each base station and terminal station have directional antennas respectively, and a base station has direction-determining patterns for setting a direction of an antenna according to a timing, the adjacent base stations each using the same frequency use different direction-determining. patterns from each other, and remote base stations repeatedly use the same direction-determining patterns. The direction-determining pattern has a correlation between a timing obtained by equally dividing a frame for a communication line by a number of direction-determining patterns and each antenna direction, and a communication slot is allocated based on a timing decided according to the table to a communication line with a terminal station positioned at a particular direction.

Abstract: An incoming signal including the object signal and plurality of noise signals dispersed about the object signal is fully masked with white noise and applied to a phase synchronization loop wide in loop band width and including a local oscillator repeatedly swept by a sweep generator. During the repeated sweep a control signal generator successively decreases the level of the white noise until the oscillator is locked in the phase of the object signal. At that time the signal control generator is operated to suspend the sweeping operation and prevent the white noise from being added to the incoming signal.