Patent application number | Description | Published |
20080306196 | Peroxide-Vulcanizable Fluorine-Containing Elastomer Composition - The present invention provides a peroxide-vulcanizable fluorine-containing elastomer composition which is remarkably improved in fluidity and thereby exhibits improved processability, though conventional fluorine-containing elastomer compositions could be molded only by a molding process having a problem in its productivity, for instance, compression molding or transfer molding which has been used so far as a general molding process. The present invention further provides a molded article obtained by vulcanizing the composition. The present invention also provides a fluorine-containing elastomer composition in which a large amount of a filler can be blended. Specifically, the present invention relates to the fluorine-containing elastomer composition comprising a fluorine-containing elastomer (A) composed of a structural unit derived from vinylidene fluoride and/or a structural unit of tetrafluoroethylene and a structural unit derived from at least one other monomer, and having (a) a number average molecular weight (Mn) of 30,000 to 70,000 g/mol, and (b) an iodine content of 0.3 to 1.0% by weight and an organoperoxide vulcanizing agent (B). | 12-11-2008 |
20090036604 | METHOD FOR PRODUCING A FLUOROELASTOMER - The present invention provides a method for producing a fluoroelastomer using an emulsifier which is inexpensive and hardly remains in product polymers. The present invention is related to a method for producing a fluoroelastomer, wherein vinylidene fluoride and at least one fluoroolefin monomer other than vinylidene fluoride are copolymerized in the manner of an emulsion polymerization in the presence of an emulsifier represented by C | 02-05-2009 |
20090215980 | PROCESS FOR PREPARING FLUORINE-CONTAINING POLYMER - The fluorine-containing polymer having a small number of ionic functional groups is prepared by a process, in which emulsion polymerization proceeds stably and produced polymer does not adhere to side walls of a polymerization reactor even without using an emulsifying agent, and the process comprises a first step for preparing a dispersion comprising fluorine-containing emulsified particles having ionic functional groups by polymerizing a fluorine-containing monomer mixture comprising a perhalo ethylenic monomer and a nonperhalo ethylenic monomer by using a water soluble radical polymerization initiator without adding an emulsifying agent, and a second step for preparing a fluorine-containing polymer having ionic functional groups in a small amount by emulsion polymerization of fluorine-containing monomers using a radical polymerization initiator in the presence of the fluorine-containing emulsified particles having ionic functional groups without adding an emulsifying agent, wherein the fluorine-containing emulsified particles having ionic functional groups prepared in the first step are used in an amount of from 0.01 to 5.0% by mass based on the fluorine-containing polymer to be obtained in the second step, and an amount of the water soluble radical polymerization initiator used in the first step is from 0.01 to 1,000% by mass based on the fluorine-containing emulsified particles having ionic functional groups prepared in the first step. | 08-27-2009 |
20090263603 | FLUORINE-CONTAINING ELASTOMER COMPOSITION AND MOLDED ARTICLE COMPRISING THE SAME - An object of the present invention is to provide a fluorine-containing elastomer composition being flexible and having excellent fuel barrier property, heat resistance, chemical resistance and oil resistance. Another object of the present invention is to provide a sealing material, a molded article and a fuel hose obtained by crosslinking the fluorine-containing elastomer composition. The composition is a fluorine-containing elastomer composition comprising a polyol-crosslinkable fluorine-containing elastomer, a polyol crosslinking agent and a hydrotalcite, wherein an acid acceptor comprising only an oxide or hydroxide of a divalent metal is contained in an amount of not more than 2 parts by weight based on 100 parts by weight of the fluorine-containing elastomer. | 10-22-2009 |
20120029152 | FLUORINE-CONTAINING ELASTOMER MIXTURE, METHOD FOR PRODUCING SAME, COMPOSITION FOR VULCANIZING PEROXIDE, AND MOLDED ARTICLE - A fluoroelastomer mixture, including: a peroxide-vulcanizable fluoroelastomer (A) containing an iodine atom; and a peroxide-vulcanizable fluoroelastomer (B) containing an iodine atom. The fluoroelastomer (A) is a copolymer (a1) consisting of 50 to 85 mol % of a vinylidene fluoride unit and 15 to 50 mol % of a perfluoro(alkyl vinyl ether) unit, or a copolymer (a2) consisting of 45 to 85 mol % of a vinylidene fluoride unit, 1 to 30 mol % of a tetrafluoroethylene unit, and 14 to 30 mol % of a perfluoro(alkyl vinyl ether) unit. Further the fluoroelastomer (B) has a fluorine content of 70.0% or more. Also disclosed is a composition for peroxide vulcanization containing the above fluoroelastomer composition (i), a polyfunctional unsaturated compound (ii) and a peroxide (iii), as well as a method for producing the fluoroelastomer mixture. | 02-02-2012 |
20120067706 | BELT - The present invention provides a belt excellent in mechanical properties at high temperatures. The belt of the present invention comprises a cross-linked fluororubber layer obtainable by cross-linking a fluororubber composition containing a fluororubber (A) and a carbon black (B). The cross-linked fluororubber layer has a loss modulus E″ of 400 kPa or higher and 6,000 kPa or lower determined by a dynamic viscoelasticity test (measurement temperature: 160° C., tensile strain: 1%, initial force: 157 cN, frequency: 10 Hz). | 03-22-2012 |
20120073696 | HOSE - The present invention provides a hose excellent in mechanical properties at high temperatures. The hose of the present invention comprises a cross-linked fluororubber layer obtainable by cross-linking a fluororubber composition containing a fluororubber (A) and a carbon black (B). The cross-linked fluororubber layer has a loss modulus E″ of 400 kPa or higher and 6,000 kPa or lower determined by a dynamic viscoelasticity test (measurement temperature: 160° C., tensile strain: 1%, initial force: 157 cN, frequency: 10 Hz). | 03-29-2012 |
20120077924 | FLUORORUBBER MOLDED ARTICLE - To provide a fluororubber formed product having excellent heat resistance and excellent mechanical properties at high temperatures. | 03-29-2012 |
20120077925 | SEALING MATERIAL - To provide a sealing material which is excellent in sealability under high-temperature conditions as well as crack resistance at high temperatures and high compression. A sealing material comprising a cross-linked fluororubber layer obtainable by cross-linking a fluororubber composition containing a fluororubber (A) and a carbon black (B), the cross-linked fluororubber layer having a loss modulus E″ of 600 kPa or higher and 6,000 kPa or lower determined by a dynamic viscoelasticity test under conditions of measurement temperature: 160° C., tensile strain: 1%, initial force: 157 cN, and frequency: 10 Hz. | 03-29-2012 |
20120077926 | METHOD FOR PRODUCING FLUORORUBBER COMPOSITION - The present invention provides a method for producing a fluororubber composition that has excellent heat resistance and excellent mechanical properties at high temperatures. The production method comprises the step of mixing a fluororubber (A) and a carbon black (B) in the presence of an organic amine compound (C1) and/or an acid acceptor (C2) to prepare a mixed product, wherein the mixed product has a highest temperature Tm of 80° C. to 220° C. while being mixed and has a highest temperature of 80° C. to 220° C. upon being discharged. | 03-29-2012 |
20120077927 | FLUORORUBBER COMPOSITION - The present invention provides a fluororubber composition that has excellent heat resistance and excellent mechanical properties at high temperatures. The fluororubber composition comprises 100 parts by mass of a peroxide cross-linkable fluororubber (A); 5 to 50 parts by mass of a carbon black (B); 0.1 to 10 parts by mass of a peroxide cross-linking agent (C); and 10 parts by mass or smaller of a bisolefin (D). | 03-29-2012 |
20120077938 | VIBRATION ISOLATION RUBBER - The present invention provides a vibration isolation rubber excellent not only in heat-aging resistance and oil resistance but also in mechanical properties at high temperatures. The vibration isolation rubber of the present invention comprises a cross-linked fluororubber layer obtainable by cross-linking a fluororubber composition containing a fluororubber (A) and a carbon black (B). The cross-linked fluororubber layer has a loss modulus E″ of 400 kPa or higher and 6,000 kPa or lower determined by a dynamic viscoelasticity test (measurement temperature: 160° C., tensile strain: 1%, initial force: 157 cN, and frequency: 10 Hz). | 03-29-2012 |
20120077939 | FLUORORUBBER MOLDED ARTICLE - The present invention provides a fluororubber formed product having excellent heat resistance and excellent mechanical properties at high temperatures. The formed product comprises a cross-linked fluororubber product obtainable by cross-linking a fluororubber composition containing a fluororubber (A) and a carbon black (B), the fluororubber (A) being a vinylidene fluoride fluororubber including 48 to 88 mol % of a structural unit derived from vinylidene fluoride and 0 to 10 mol % of a structural unit derived from tetrafluoroethylene relative to the total amount 100 mol % of structural units derived from all monomer components, the cross-linked fluororubber product having a loss modulus E″ of 400 kPa or higher and 6,000 kPa or lower determined by a dynamic viscoelasticity test (measurement temperature: 160° C., tensile strain: 1%, initial force: 157 cN, and frequency: 10 Hz). | 03-29-2012 |
20120095150 | FLUORORUBBER COMPOSITION - The present invention provides a fluororubber composition that has excellent heat resistance and excellent mechanical properties at high temperatures. The fluororubber composition comprises a peroxide cross-linkable fluororubber (A); a carbon black (B); a peroxide cross-linking agent (C); and a low-self-polymerizing cross-linking accelerator (D), wherein to 100 parts by mass of the fluororubber (A), the amount of the carbon black (B) is 5 to 50 parts by mass, the amount of the cross-linking agent (C) is 0.01 to 10 parts by mass, and the amount of the cross-linking accelerator (D) is 2.5 parts by mass or smaller. | 04-19-2012 |
20120095151 | COMPLEX-SHAPED FLUORORUBBER FORMED PRODUCT - The present invention provides a complex-shaped fluororubber formed product having excellent demoldability in molding. The complex-shaped fluororubber formed product of the present invention comprises a cross-linked fluororubber layer obtainable by cross-linking a fluororubber composition containing a fluororubber (A) and a carbon black (B). The cross-linked fluororubber layer has a loss modulus E″ of 400 kPa or higher and 6,000 kPa or lower determined by a dynamic viscoelasticity test (measurement temperature: 160° C., tensile strain: 1%, initial force: 157 cN, frequency: 10 Hz). | 04-19-2012 |
20130217816 | FLUORINE RUBBER COMPOSITION AND BLADDER FOR TIRE PRODUCTION - A fluorine rubber composition that provides high tensile strength and high elongation after vulcanization mutually compatible and from which favorable mechanical characteristics are obtained even in a high-temperature environment; and a bladder for tire production, which is manufactured using the same are provided. The fluorine rubber composition includes a rubber component containing a fluorine rubber and carbon black, wherein the carbon black has a specific surface area by nitrogen adsorption (N2SA) of 25 m2/g or more and not more than 180 m2/g and a dibutyl phthalate (DBP) absorption amount of 60 mL/100 g or more and not more than 180 mill 00 g; and in a kneading step (A) of compounding the carbon black in the rubber component, an average shear rate of a rotor surface of a kneading machine is 100 (1/sec) or more, and a kneading maximum temperature Tm is 120° C. or higher and not higher than 200° C. | 08-22-2013 |
20130274420 | FLUOROELASTOMER, CURABLE COMPOSITION AND CURED RUBBER ARTICLE - A noncrystalline fluoroelastomer which is a copolymer consisting essentially of vinylidene fluoride and a fluoromonomer represented by the general formula (1): | 10-17-2013 |