摘要:
An acrylic rubber comprising at least 0.1 and less than 3 wt % of monomer units of ethylene, from 0 to 10 wt % of monomer units of a cross-linkable monomer, and more than 87 and not more than 99.9 wt % of monomer units of at least one alkyl acrylate.
摘要:
A receiving frame controlling unit 4a for controlling receiving operations of a plurality of frames individually, and a receiving state detecting unit 1b for detecting whether or not a receiving state is in or out of a service area of the base station are provided in a CPU 4, wherein the power saving or conservation can be achieved in the out of the service area status by halting frame receiving operations when the receiving state is out of the service area. Also, according to an error rate of received radio information, or according to a time zone which is set arbitrarily to particular information broadcasting addresses by a user, the power saving or conservation may be achieved by reducing the number of receiving frames. Further, if the receiving state is out of the service area and also the electric field strength is low, the power saving or conservation may be achieved by executing a short-time standby operation to monitor only the electric field state.
摘要:
An acrylic rubber composition comprising (A) a copolymer and (B) a crosslinking agent, said copolymer (A) consisting essentially of (a) from 3 to 10% by weight of ethylene, (b) from 0 to 10% by weight of at least one crosslinkable monomer selected from the group consisting of monomers of the formulas (1), (2), (3) and (4): ##STR1## wherein R.sub.1 is hydrogen or methyl, ##STR2## wherein R.sub.2 is vinyl, allyl or methallyl, ##STR3## wherein R.sub.3 is hydrogen or methyl,R.sub.4 OOC--CH.dbd.CH--COOH (4)wherein R.sub.4 is methyl, ethyl, propyl, butyl, methoxymethyl, methoxyethyl, methoxypropyl, methoxybutyl, ethoxybutyl, ethoxyethyl, ethoxypropyl or ethoxybutyl, and (c) from 80 to 97% by weight of other copolymer component, said other copolymer component (c) consisting essentially of (i) from 0 to 10% by weight of vinyl acetate, (ii) from 20 to 45% by weight of ethyl acrylate and (iii) from 45 to 70% by weight of n-butyl acrylate, the total amount of constituents (i), (ii) and (iii) being 100% by weight.
摘要:
A single phase three-level power converter can include a first half bridge and a second half bridge. A half bridge operation is implemented in either the first half bridge or second half bridge when outputting a single phase alternating current voltage having an amplitude a half or less than that of a direct current input voltage, and also, by alternately switching between the bridges carrying out the half bridge operation. In certain configurations, the power converter can convert a direct current input voltage into alternating current phase voltages having three levels of potential, which are positive, negative, and intermediate voltages, by controlling on-off conditions of a plurality of switch elements, and a controller that, by supplying gate signals to the switch elements configuring the first half bridge and second half bridge, controls the related on-off conditions.
摘要:
Provided are a sulfur-modified chloroprene rubber with reduced exothermicity, a molding thereof, and a production method therefor.A sulfur-modified chloroprene rubber modified at the polymer terminals with at least one compound selected from tetramethylthiuram disulfide, tetraalkylthiuram disulfides with alkyl groups having a carbon number of 2 to 7 anddialkyldithiocarbamic acid salts with alkyl groups having a carbon number of 1 to 7, wherein there are peak tops at 3.55 to 3.61 ppm and at 3.41 to 3.47 ppm in 1H-NMR spectrum, as determined in deuterochloroform solvent, wherein the ratio (A/B) of the peak area (A) at 3.55 to 3.61 ppm to the peak area (B) at 4.2 to 6.5 ppm is 0.05/100 to 0.50/100, and the extract with ethanol/toluene azeotropic mixture, as specified by JIS K 6229, is 3.0 to 9.0 mass %.
摘要:
Provided is a laminate having elastomer layers tightly bonded to each other.The laminate according to the present invention 1 has an acrylic elastomer layer 11 and a fluorine elastomer layer 12 that are bonded to each other. The acrylic elastomer layer 11 is made of an acrylic elastomer composition having an epoxy group-containing acrylic elastomer and an onium salt added and the fluorine elastomer layer 12 is made of a fluorine elastomer composition having a fluorine elastomer and a polyol crosslinking agent added. In the laminate 1, the elastomer layers are bonded tightly to each other even without any surface treatment.
摘要:
Desired is a technology for improving the vibration-damping properties of a chloroprene rubber under low-temperature environment without deterioration of the mechanical properties, permanent compression set, and tension fatigue.Provided is a chloroprene rubber composition, comprising a chloroprene rubber at least containing a xanthogen-modified chloroprene rubber and/or a mercaptan-modified chloroprene rubber in an amount of 100 parts by mass, a carbon black having a number-average particle diameter of 70 nm to 600 nm and a DBP oil absorption, as determined by the Oil Absorption A method of JIS-K6221, of 15 ml/100 g to 60 ml/100 g in an amount of 15 to 150 parts by mass, and a plasticizer represented by the following Chemical Formula (1) in an amount of 3 to 30 parts by mass: [C.1] R1COO—(CH2)8—COOR2 (1) (wherein, R1 and R2 each represent an alkyl group having a carbon number of 1 to 7).
摘要:
To provide a chloroprene rubber composition providing good permanent compression set and excellent mechanical strength, a vulcanizate of the composition, and a molded article of the composition.A chloroprene rubber composition including a chloroprene rubber and a natural rubber in a total amount of 100 parts by mass, a copolymer of styrene and butadiene in an amount of 0.1 to 10 parts by mass, ethylene thiourea in an amount of 0.1 to 3.0 parts by mass, and dipentamethylenethiuram tetrasulfide in an amount of 0.1 to 3.0 parts by mass is vulcanized after or during molding of the composition to yield a vulcanized molding.
摘要:
Provided are a sulfur-modified chloroprene rubber with reduced exothermicity, a molding thereof, and a production method therefor.A sulfur-modified chloroprene rubber modified at the polymer terminals with at least one compound selected from tetramethylthiuram disulfide, tetraalkylthiuram disulfides with alkyl groups having a carbon number of 2 to 7 and dialkyldithiocarbamic acid salts with alkyl groups having a carbon number of 1 to 7, wherein there are peak tops at 3.55 to 3.61 ppm and at 3.41 to 3.47 ppm in 1H-NMR spectrum, as determined in deuterochloroform solvent, wherein the ratio (A/B) of the peak area (A) at 3.55 to 3.61 ppm to the peak area (B) at 4.2 to 6.5 ppm is 0.05/100 to 0.50/100, and the extract with ethanol/toluene azeotropic mixture, as specified by JIS K 6229, is 3.0 to 9.0 mass %.
摘要:
To provide a chloroprene rubber composition with which a vulcanized rubber having further improved heat resistance without impairing mechanical properties, the compression set and the tension fatigue can be obtained, and a rubber member for an automobile, a hose, a rubber molded article and a rubber vibration insulator comprising the vulcanized rubber.A chloroprene rubber composition, which comprises 100 parts by mass of at least one chloroprene rubber selected from the group consisting of a xanthogen-modified chloroprene rubber and a mercaptan-modified chloroprene rubber, and from 15 to 200 parts by mass of carbon black having a number average particle size of from 70 nm to 600 nm and having a DBP oil absorption of from 15 ml/100 g to 60 ml/100 g by oil absorption method A of JIS K6221.