摘要:
A fluorine-containing elastomer for molding fuel system parts, which has a copolymer composition comprising 10-40% by weight of tetrafluoroethylene (TFE), 80-30% by mole of vinylidene fluoride (VdF), and 10-30% by mole of hexafluoropropylene (HFP), as copolymerized in the presence of an iodine and bromine-containing compound represented by the following general formula: RBrnIm (where R is a fluorohydrocarbon group, a chlorofluorohydrocarbon group, or a hydrocarbon group, each having 1-10 carbon atoms, and n and m each are 1 or 2), and has an intrinsic viscosity of 20-180 ml/g, Mw (weight average molecular weight)/Mn (number average molecular weight) ratio of 2-20, and a molecular weight distribution of monopeak or multipeak type, and a fluorine-containing elastomer composition, which comprises the fluorine-containing elastomer, at least one of a polyol vulcanizing agent and a polyamine vulcanizing agent, an organic peroxide, and a polyfunctional unsaturated compound. The composition is suitable for use in molding fuel system parts to give fluorine-containing elastomer moldings with distinguished moldability, vulcanizate physical properties, chemical resistance, photostability and economy.
摘要:
A fluoroelastomer is produced by the polymerization reaction of a fluorinated olefin using a ωH perfluorocarboxylic acid represented by the general formula: H(CF2)nCOOM (wherein M is hydrogen atom, alkali metal, or ammonium group; and n is 6, 7, or 8) or a salt thereof, as an emulsifier. The fluoroelastomer produced by the method of the present invention has a low Mooney viscosity ML1+10(121° C.) and thereby has an improved fluidity, which is essential for injection molding materials, as a result of the polymerization reaction of a fluorinated olefin using a ωH perfluorocarboxylic acid (salt) as an emulsifier. Accordingly, the productivity in injection molding can be improved. Moreover, there is neither remarkable decrease in the polymerization rate of the polymerization reaction nor deterioration of the physical properties of the vulcanizate, such as tensile strength, compression set characteristics, and hot tear resistance.
摘要:
A splitter includes, in parallel between trunk terminals and branch terminals, a signal branching circuit that blocks distributed power and passes a PLC communication signal and a power branching circuit that blocks the communication signal and passes the distributed power. In the signal branching circuit, impedance viewed from the branch terminal side is matched with characteristic impedance of a power line and impedance viewed from the trunk terminal side is higher than impedance viewed from the branch terminal side, in the frequency band of the communication signal. In the power branching circuit, input/output impedance is set to be sufficiently higher than the impedance of the signal branching circuit viewed from the trunk terminal side, in the frequency band of the communication signal.
摘要:
The object of the present invention is to provide an anti-obesity agent which contains a tea-derived component and which is safe and does not compromise the flavor of foods and beverages.According to the present invention, a safe and palatable anti-obesity agent can be provided by incorporating a benzotropolone ring-containing compound which has tea-derived, high inhibitory activities against lipase and alfa-glucosidase. The anti-obesity agent of the present invention does not compromise the flavor of foods and beverage, has palatability, and can be used in various use applications including foods and beverages intended for health enhancement such as reduction in triglycerides.
摘要:
A mixture of polyfluoroalkadienes represented by the general formulae: CF3(CF2)nCF═CH(CF2)m+1CH═CH2 [Ia] and CF3(CF2)n+1CH═CF(CF2)mCH═CH2 [Ib], wherein n is an integer of 0 to 5, and m is an integer of 0 to 6, is obtained as a mixture fraction of products [Ia] and [Ib] by reacting a polyfluoroalkyl iodide represented by the general formula: CF3(CF2)n+1CH2(CF2)m+1(CH2CH2)I [II], with an organic basic compound. The polyfluoroalkadiene mixture is compounds having a perfluoroalkyl group in which the number of successive CF2 groups is 5 or less, and is effectively used as a copolymerizable monomer in the production of resinous or elastomeric fluorine-containing copolymers, which are used as active ingredients of surface-treating agents, such as water- and oil-repellents and mold-release agents.
摘要:
The object of the present invention is to provide an anti-obesity agent which contains a tea-derived component and which is safe and does not compromise the flavor of foods and beverages.According to the present invention, a safe and palatable anti-obesity agent can be provided by incorporating a benzotropolone ring-containing compound which has tea-derived, high inhibitory activities against lipase and alfa-glucosidase. The anti-obesity agent of the present invention does not compromise the flavor of foods and beverage, has palatability, and can be used in various use applications including foods and beverages intended for health enhancement such as reduction in triglycerides.
摘要:
Disclosed is a mixture of fluoroolefin iodides represented by the general formulae: CnF2n+1CF2CH═CF(CF2CF2)mI [Ia] and CnF2n+1CF═CHCF2(CF2CF2)mI [Ib] wherein n is an integer of 0 to 5, and m is an integer of 1 to 3. The fluoroolefin iodide mixture is produced by subjecting a fluoroalkyl iodide represented by the general formula: Cn2n+1CF2CH2CF2(CF2CF2)mI [II] wherein n is an integer of 0 to 5, and m is an integer of 1 to 3, to an HF-elimination reaction in the presence of a basic compound.
摘要:
Disclosed is a peroxide-crosslinkable fluoroelastomer obtained by copolymerization of 0.1 to 20 mol % of a mixture of fluoroolefin iodides represented by the general formulae: CnF2n+1CF2CH═CF(CF2CF2)mI [Ia] and CnF2n+1CF═CHCF2(CF2CF2)mI [Ib], wherein n is an integer of 0 to 5, and m is an integer of 1 to 3. The peroxide-crosslinkable fluoroelastomer is copolymerized with a monomer having a side chain containing a peroxide-crosslinkable halogen atom, and has excellent vulcanizate physical properties and improved compression set characteristics when subjected to peroxide crosslinking.
摘要:
In this invention, even if final code data is to be generated by selectively discarding code data for each bitplane, errors due to bitplane rounding down operation can be suppressed from being gradually accumulated in predicted data such as P- and B-pictures, thereby preventing a deterioration in image quality. For this purpose, a block segmentation unit (31) segments an input frame into a plurality of blocks, and supplies the respective blocks to a difference computing unit (32). The difference computing unit (32) outputs the blocks to a DWT unit (33) without any change when the intra-frame coding mode is set. When the inter-frame coding mode is set, the difference computing unit (32) outputs the result obtained by computing a difference from predicted data from a motion compensation unit (42) to the DWT unit (33). The frequency component data obtained by the DWT unit (33) and a quantization unit (34) is entropy-coded by an entropy coding unit (35), and a bitplane formed by bit information at the bit position of each component value is coded. A bitplane round-down unit (36) rounds down the code data of bitplanes from the least significant position to an upper bit position such that the resultant code amount becomes equal to or less than a target code amount. A code forming unit then generates code data. Only when the intra-frame coding mode is set, a dequantization unit (39) and inverse DWT unit (40) are executed to update a frame memory (41).
摘要:
This technique prevents errors from being gradually accumulated on the decoding side, while maintaining high scalability, even when transformation to subbands as a plurality of frequency components is used for moving image coding. The image data of one input frame is decomposed into a plurality of subbands having different frequency components by a discrete wavelet transformation unit. A lower bitplane coding unit codes, for each bitplane, predetermined lower bits of each coefficient data of a subband LL and the coefficient data of subbands other than the subband LL. The data of the upper bits of the subband LL is stored in a frame memory. A motion vector detection unit detects a predicted value and motion vector on the basis of the decoded data of the subband LL in a preceding frame. A subtracter obtains the difference between the detected predicted value and the current frame.