Daikin Industries, Ltd.

Dow Corning Corporation

Dainichiseika Color & Chemicals Mfg. Co., Ltd.

Daiken Industries, Ltd.

Mitsuru Kishine

Tsuyoshi Noguchi

Tatsuya Morikawa

Masanori Kitaichi

Kazuyoshi Kawasaki

Masaki Irie

Sadashige Irie

Manabu Fujisawa

Hiroyuki Tanaka

Shigeru Morita

Takafumi Yamato

Masahiko Oka

Hideya Saito

Keiko Washino

Yutaka Ueta

Yoshiki Tanaka

Masuo Kokumai

Katsuhiko Iseki

Tetsuo Shimizu

Daisuke Ota

Hirofumi Nishibayashi

Satoshi Tokuno

Katsuhiko Higashino

Tsuyoshi Itagaki

Yoshiyuki Tanaka

Toshio Sogabe

Yousuke Nishimura

Takahisa Aoyama

Nobuhiko Tsuda

Masayasu Tomoda

Shoji Fukuoka

Hirokazu Yukawa

Yosuke Nishimura

Hiroshi Aihara

Kazuhiro Yamamura

Masanori Hasegawa

Etsuo Minamino

Tomizo Sota

Yasuji Iwasaki

Kazuhide Sawada

Tetsuo Kitahaba

Kazuyoshi Mimura

Shintarou Ogata

Sang Bong Han

Tadashi Okawa

Takayuki Araki

Kazuo Kobayashi

Yoshito Tanaka

Shoji Kawachi

Hiroshi Nishimura

Takashi Yoshimura

Ryuji Tachibana

Yoshihiro Shirai

Toshiki Ichisaka

Yuji Yutani

Tsuyoshi Ono

Mitsuo Tsukamoto

Katsuhide Otani

Kazuhisa Matsumoto

Yasuko Takagahara

Satoshi Oishi

Koji Matsumoto

Yoshiki Maruya

Yoshinori Hori

Yoshiko Mori

Aya Sakai

Michiko Kitagawa

Shuumi Nishii

Yukiharu Nakamura

Natsue Miyoshi

Yukinaru Nakamura

Katsumi Kihara

Ikuo Kikuta

Fumiya Aizawa

Shingo Sakuda

Yuji Arashima

Seiji Kawaguchi

A molded piece set including two or more colored molded pieces having different compositions. One of the colored molded pieces and at least another of the colored molded pieces have a CIEDE2000 color difference of 1.0 or lower and a metamerism index of 1.0 or lower. Also disclosed is a computer color matching system, a database including color data sets corresponding to two or more respective colored molded pieces having different compositions and a method for producing the molded piece set.

Molded piece set, computer color matching system, database, and method of manufacturing molded piece set

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 CFCOOM, wherein M represents H, NHor an alkali metal.

Method for producing a fluoroelastomer

The present invention provides a TFE/Pr type elastomer being excellent in not only amine resistance but also heat resistance and chemical resistance and having a small gel content, and a crosslinkable composition comprising the elastomer. The above-mentioned fluorine-containing elastomer is a fluorine-containing elastomer being crosslinkable with the compound (A), comprising 40 to 70% by mole of tetrafluoroethylene unit, 30 to 60% by mole of propylene unit and 0.1 to 2.5% by mole of a carboxyl group-containing vinyl monomer unit and having a Mooney viscosity at 121&#xb0; C. of 5 to 100.

Fluorine-containing elastomer and crosslinkable composition comprising same

The present invention provides a method of producing a fluoroelastomer excellent in dispersion stability at low cost, at a high rate of polymerization and in high yields. The present invention is a method of producing a fluoroelastomer comprising an emulsion polymerization of a fluorinated monomer in the presence of a water-soluble radical polymerization initiator, wherein the emulsion polymerization is carried out in the presence of a compound (1) containing a functional group reactive in radical polymerization and a hydrophilic group and a fluorinated compound (2) containing a fluorocarbon group comprising 1 to 6 continuously united carbon atom with fluorine atom directly bound to each of them as well as a hydrophilic group.

Method for producing fluorine-containing elastomer

A process for preparing a fluorine-containing polymer which includes a first step for preparing a dispersion of fluorine-containing emulsified particles (A) having ionic functional groups where a fluorine-containing monomer mixture (i) is polymerized by using a water soluble radical polymerization initiator (a) without addition of an emulsifying agent, and a second step for preparing a fluorine-containing polymer (b) having a small amount of ionic functional groups where fluorine-containing monomers (ii) are emulsion-polymerized by using a radical polymerization initiator (b) in the presence of the fluorine-containing emulsified particles (A) having ionic functional groups without addition of an emulsifying agent.

Process for preparing fluorine-containing polymer

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.

Fluorine-containing elastomer mixture, method for producing same, composition for vulcanizing peroxide, and molded article

There is provided a fluorine-containing elastomer composition assuring easy kneading and providing a crosslinked article having improved strength. The fluorine-containing elastomer composition comprises (A) an elastomer of a vinylidene fluoride/hexafluoropropylene copolymer having a branching coefficient of 30 to 300 ppm, a Mooney viscosity (ML: 121&#xb0; C.) of 7 to 80 and a molecular weight distribution (Mw/Mn) of 1.5 to 4, and (B) an elastomer of a vinylidene fluoride/hexafluoropropylene copolymer having a storage modulus G' at 180&#xb0; C. at 500 cpm of 500 to 900, and a mass ratio of (A)/(B) is 70/30 to 90/10.

Fluorine-containing elastomer composition

The present invention provides a process for preparing a fluorine-containing elastomer in a high productivity comparable to that of non-iodine transfer polymerization process by carrying out an iodine transfer polymerization at high pressure. The present invention also provides a fluorine-containing elastomer prepared by this process, and fluorine-containing molded articles. The process is a batch copolymerization process conducted under conditions that the reduced temperature of the critical constant is at least 0.95 and the reduced pressure of the critical constant is at least 0.80 wherein the reduced temperature and the reduced pressure are calculated using the Peng-Robinson formula from the critical temperature, the critical pressure and the composition ratio of each of the monomers in the gaseous phase in a reaction vessel, in which ethylenically unsaturated compounds containing at least one fluoroolefine are copolymerized in the presence of a compound having the formula: R&#xb7;Iwherein Ris a saturated or unsaturated fluorohydrocarbon or chlorofluorohydrocarbon group having 1 to 16 carbon atoms, and x is the number of bonds of Rand an integer of 1 to 4.

Process for preparing vulcanizable fluorine-containing elastomer

The invention provides a fluoropolymer composition capable of improving the characteristics of the cured material obtained therefrom. A fluoropolymer composition comprising a methylene group-containing fluoropolymer (A) and a hydrosilylation catalyst (B), wherein the methylene group-containing fluoropolymer (A) has methylene group-containing repeating units in the main chain thereof and is capable of hydrosilylation in the presence of the hydrosilylation catalyst (B) and one terminus of the chain is a carbon-carbon double bond or an Si&#x2014;H group and the other terminus of the chain is an Si&#x2014;H group or a carbon-carbon double bond.

Fluorine-containing polymer composition and cured body

This invention provides a novel compound which can be properly used as a surfactant, a method of producing a fluoropolymer, surfactant and a fluoropolymer aqueous dispersions using the novel compound. This invention is a fluoroalkylcarboxylic acid derivative which is represented by the general formula (i):Rf(OCHCFCF)OCXXCF(Rf)COOM&#x2003;&#x2003;(i)wherein Rfrepresents a straight or branched fluoroalkyl group containing 1 to 20 carbon atoms, which fluoroalkyl group may optionally contain 1 to 5 oxygen atoms in the principal chain thereof, Rfrepresents a straight or branched fluoroalkylene group containing 1 to 25 carbon atoms, said fluoroalkylene group may optionally contain 1 to 5 oxygen atoms in the principal chain thereof, n1 represents an integer of 0 to 3, n2 represents an integer of 0 or 1, Xand Xare the same or different and each represents hydrogen atom or fluorine atom, and M represents NHor a monovalent metal element.

Fluoroalkyl carboxylic acid derivative, method for producing fluorine-containing polymer, and aqueous dispersion of fluorine-containing polymer

The present invention provides a novel fluorine-containing rubber composite material having both of excellent fuel impermeability and excellent cold resistance, a fuel impermeable sealing material comprising the composite material and a process for preparing the composite material. The fluorine-containing rubber composite material comprises crosslinked particles of fluorine-containing silicone rubber dispersed in a fluorine-containing rubber. It is preferable that the fluorine-containing rubber comprises a vinylidene fluoride/tetrafluoroethylene/perfluoro vinyl ether copolymer, and the composite material has cold resistance of not more than &#x2212;35&#xb0; C. and fuel permeability of not more than 500 g&#xb7;mm/m&#xb7;day. The fuel impermeable sealing material comprises the composite material. The process for preparing the composite material comprises a step for co-coagulation of a fluorine-containing rubber emulsion and an emulsion of crosslinked fluorine-containing silicone rubber.

Composite material comprising flourine-containing rubber, fuel-impermeable sealing material comprising same, and process for preparing composite material

The present invention has for its object to provide a fluorocopolymer which is available at low cost, has fluidity at room temperature, and is curable, a method of producing the same copolymer and a curable composition having good processability and in situ moldability. The present invention is directed to a fluorocopolymer which is fluid at room temperature and curable, and which is obtainable from a trifluorovinyl group-containing monomer with an ethylenically unsaturated double bond moiety being a trifluorovinyl group.

Fluorocopolymer, process for producing fluorocopolymer, fluorocopolymer curable composition, and cured object

The present invention provides a fluorine-containing elastomer composition comprising a fluorine-containing elastomer (A) and a fluorine-containing elastomer (B) having a fluorine amount of at least 67% by weigh and a lower molecular weight than the fluorine-containing elastomer (A), wherein the fluorine amount of the fluorine-containing elastomer (B) is larger than a fluorine amount of the fluorine-containing elastomer (A). The present invention also provides a molded article obtained by crosslinking the fluorine-containing elastomer composition.

Fluorine containing elastomer composition and molded article comprising the same

To provide a novel crosslinking system of fluorine-containing elastomer giving a crosslinked product particularly having improved mechanical strength and compression set at high temperature. A fluorine-containing rubber composition comprising a fluorine-containing elastomer having carboxyl group and/or alkoxycarbonyl group at an end of a trunk chain and/or branched chain as a crosslinkable group.

Fluorine-containing elastomer and composition thereof for crosslinking

The present invention provides a graft or a block polymer in which a fluorine rubber and a silicone rubber are chemically bonded. The present invention is a graft or a block polymer comprising at least one kind of a silicone rubber segment and at least one kind of a fluorine elastomer segment. Furthermore, it is preferable that a fluorine containing elastomer segment is an elastomer segment comprising vinylidene fluoride or an elastomer segment comprising tetrafluoroethylene and that a silicone rubber segment has a unit of dimethylsiloxane and/or methyl-3,3,3-trifluoropropylsiloxane.

Fluorine-containing graft or block polymer

Growing community of inventors

Settsu, Japan

Mitsuru Kishine