Abstract: A pneumatic tire having an air permeation preventive layer comprising (A) a thin film of at least one aliphatic polyamide resin wherein at least part of the amide groups thereof are modified with alkoxyalkyl groups, (B) a thin film obtained from the curing a liquid composition containing (i) a multi component copolymer polyamide resin, (ii) a curable resin, and (iii) a curing agent for curing the curable resin, (C) a thin film obtained by coating and cross-linking a polymer composition containing (i) at least one aliphatic polyamide resin wherein at least part of the amide groups thereof are modified with alkoxyalkyl groups and/or groups having curable unsaturated bonds and (ii) at least one cross-linking agent and/or curable resin other than an acid, or (D) a thin film of a vinylidene chloride-acrylonitrile copolymer obtained by copolymerizing 5 to 50 molar % of acrylonitrile.

Abstract: A thermoplastic elastomer composition containing a thermoplastic resin component including 10 to 95% by weight of a polypropylene having a syndiotactic structure and an elastomer component and having a value of .alpha., defined as follows, of 1 or less:.alpha.=(.phi.d/.phi.m).times.(.eta.m/.eta.d)wherein the volume fraction of the thermoplastic resin component is .phi.m, the melt viscosity thereof at the mixing conditions is .eta.m and the volume fraction of the elastomer component is .phi.d, the melt viscosity thereof is .eta.d.

Abstract: A thermoplastic elastomer composition comprising:i) from 15 to 80 parts by weight of a polyamide thermoplastic resin as component A;ii) from 20 to 85 parts by weight of a rubber composition as component B, the rubber composition containing a copolymer rubber composed of a copolymer of a C.sub.4 to C.sub.7 isomonoolefin and a p-alkylstyrene, where at least a part of the p-alkylstyrene unit portions thereof have a halogen atom; andiii) a cross-linking agent,wherein the thermoplastic resin component A forms a continuous phase and at least part of component B is dispersed in component A as a dispersed phase and at least part of the dispersed phase is cross-linked by the cross-linking agent.

Abstract: A hose useful for handling low temperature fluids such as refrigerants is disclosed, which exhibits excellent resistance to ozone and moisture permeation. A cover or outermost tube of the hose is formed from a vulcanizate of a rubber composition comprising a first copolymer rubber having an isobutylene unit and a p-halogenated methylstyrene unit and/or a second copolymer rubber having an isobutylene unit, a p-halogenated methylstyrene unit and a p-methylstyrene unit.

Abstract: A pneumatic tire having an air permeation prevention layer composed of a thin film of a resin composition including at least 20% by weight of a thermoplastic polyester elastomer comprised of a block copolymer of polybutylene terephthalate and polyoxyalkylene diimide diacid at a weight ratio of polybutylene terephthalate/polyoxyalkylene diimide diacid of 85/15 or less.

Abstract: A composite dry vacuum pump of this invention has closed chambers accommodating a pair of screw rotors and a pair of roots rotors respectively mounted coaxially to the front ends of the screw rotors. The roots rotors and the screw rotors are rotated at the same speed in opposite directions by a motor to aspirate fluids from a suction port on one end wall and discharge the fluid through a discharge port on the outer surface of the other end wall. The characteristics of power requirement of the portion of the roots rotors and that of the portion of the screw rotors changes inversely to the suction port pressure variation, therefore the characteristic of the total power requirement of the pump of this invention is almost flat over the all pressure range and the motor having smaller output power can operate the pump according to the present invention.

Abstract: A gas exhaust system for use in a semiconductor manufacturing process wherein mechanical or chemical processing is applied on silicon wafers or the like arranged in a air-tight process chamber thereof, comprises a vacuum chamber having a gas suction port formed on an upper side thereof and a gas exhaust port formed on a lower side thereof. In the vacuum chamber, the first and second rotors are arranged vertically and supported rotatably at their lower end port ions in a cantilevered condition. The first and second rotors are driven to rotate in the opposite directions to thereby form a certain degree of vacuum condition in the vacuum chamber, whereby the residual gasses in the process chamber are discharged therefrom through the gas exhaust system.

Abstract: Rubber compositions having high tensile modulus at 100% and strong metal adhesion. The rubber compositions include chlorinated polyethylene rubber and/or its derivative reformed with maleic anhydride with from 0.2 to 10 parts by weight per 100 parts of the rubber of a 2,4,6-trimercapto-1,3,5-triazine dicyclohexylamine salt.

Abstract: A hose including at least an inner tube, a reinforcing layer and an outer cover, wherein the inner tube and the outer cover are individually composed of a thermoplastic elastomer comprising a vulcanized rubber dispersed in a thermoplastic resin, M.sub.p defined by the following formula (I) is not greater than 70 kgf/cm.sup.2, and flexural rigidity of the hose at a bending radius four times the outer diameter of the hose is 1 kgf or less: ##EQU1## wherein t.sub.1 and t.sub.2 are the thickness of the inner tube and the outer tube (mm), respectively, and M.sub.1 and M.sub.2 are stress (kgf/cm.sup.2) at 25% elongation of the inner tube and the outer cover, respectively.

Abstract: A composite hose is disclosed which is constructed essentially with an inner tube and an outer cover, the inner tube being formed from a composition comprised of a specified polymer alloy of a selected class of polyamide resins and acrylic rubbers and the outer cover from a composition comprised of a specified thermoplastic elastomer of a selected class of polyolefin resins and ethylene-propylene-diene rubbers and butyl-based rubber. Impermeability is greatly improved with respect to refrigerant gases and fuel oils.

Abstract: Rubber compositions are disclosed which are formulated to provide high modulus at 100% and strong adhesion to metal. Chlorinated polyethylene rubber and/or its derivative reformed with maleic anhydride is blended with specified amounts of a 2-mercaptobenzothiazole dicyclohexylamine salt, trithiocyanuric acid and sufur such that formulae (1) and (2) are met ##EQU1## where phr is defined as the amount in parts of the component per hundred parts of component (A) or component (B) or both.

Abstract: High performance hoses are disclosed which are characterized by enhanced heat resistance, leading to prolonged service life, and hence are suitable for use in automobile power steering units. Inner tubes are formed of hydrogenated acrylonitrile/butadiene copolymer rubbers of a selected composition. The inner tubes may be of a double-layered construction composed of an inner layer of hydrogenated acrylonitrile/butadiene copolymer rubber and an outer layer of rubber composition which comprises specified amounts of a selected class of sulfurs, organic peroxide and triazine compounds combined with selected sulfur-curable base rubbers.

Abstract: Rubber compositions are disclosed for integral attachment of polymeric and metallic materials. Improved bondability is attributed to the use of a selected base rubber blended with a selected class of inorganic or organic fillers, silane compounds and vulcanizing agents such that the finished composition is provided with a specified range of Mooney viscosities. Also disclosed is a method of hose-metal fitting connection by the application of the composition. Gas- and oil-impermeability characteristics are greatly enhanced.

Abstract: Rubber compositions are disclosed which are tailored to exhibit high adhesion to brass, sufficient resistance to heat and to oil and great elasticity. A selected class of highly hydrogenated acrylonitrile copolymer rubbers are blended with specified amounts of a selected class of trially isocyanurate compounds, organic sulfur-containing compounds or sulfur donors and organic peroxides. Also disclosed is a hose built with an inner tube formed from the above rubber composition and a reinforcing layer from a pressure-resistant, metallic wire plated with brass.

Abstract: A hose is disclosed which is characterized by enhanced durability against severe pressure and temperature conditions and by improved coupler attachment without bulging. The hose has a multi-layered inner tube including an inner wall and an outer wall formed respectively of a selected class of rubbers. Both walls are so structured as to satisfy specified modulus and thickness characteristics.

Abstract: Rubber compositions are disclosed for integral attachment of polymeric and metallic materials. Improved bondability is attributed to the use of a selected base rubber blended with a selected class of inorganic or organic fillers, silane compounds and vulcanizing agents such that the finished composition is provided with a specified range of Mooney viscosities. Also disclosed is a method of hose-metal fitting connection by the application of the composition. Gas- and oil-impermeability characteristics are greatly enhanced.

Abstract: Composite laminates are disclosed which are designed to exhibit superior resistance to oil and to heat and which are comprised essentially of a rubbery layer and a fibrous layer bonded thereover. The rubber layer is formed from a rubber composition made up of highly hydrogenated acrylonitrile-butadiene rubber, an organic peroxide curing agent and magnesium oxide, and the fibrous layer is formed from an organic fiber treated with a dip coating of a specified composition. Also disclosed is a composite hose in which the rubbery layer is utilized as an inner tube and the fibrous layer as a reinforcement.

Abstract: Composite laminates are disclosed which are designed to exhibit superior resistance to oil and to heat and which are comprised essentially of two different rubbery layers and a fibrous layer interposed therebetween. One rubber layer is formed from a rubber composition made up of highly hydrogenated acrylonitrile-butadiene rubber, an organic peroxide curing agent and magnesium oxide, and the other from a rubber composition of a rubber other than chlosulfonated polyethylene rubber. The fibrous layer is formed from an organic fiber treated with a dip coating of a specified composition. Also disclosed is a composite hose in which the rubbery layers and fibrous layer are assembled.

Abstract: A static random access memory comprising a semiconductor substrate, a well region formed in the substrate and containing at least one memory cell, and a power-supply terminal connected to the well region, for applying a given bias voltage to the well region.

Abstract: A static random access memory comprising a memory cell array, a plurality of peripheral circuits, first and second power-supply voltage lines, a bonding pad, and a level-shifting circuit. The array has static memory cells each having resistors functioning as load elements. The peripheral circuits control the writing of data into, and the reading of data from, the static memory cells. The first power-supply voltage line applies a first power-supply voltage to the peripheral circuits. The bonding pad is connected to the first power-supply voltage line. The second power-supply voltage line applies a second power-supply voltage to the static memory cells. The level-shifting means is connected between the first and second power-supply voltage lines, for shifting the level of the first power-supply voltage and applying the level-shifted voltage to the static memory cells via said second power-supply voltage line.