Daikin Industries, Ltd.

Kyoto University

Satoshi Tokuno

Mitsushi Itano

Mitsuru Kishine

Shun Ohkubo

Masaki Irie

Sadashige Irie

Daisuke Karube

Tatsuya Morikawa

Manabu Fujisawa

Katsuki Fujiwara

Susumu Kitagawa

Masakazu Higuchi

Yousuke Nishimura

Mana Shimokawa

Satoshi Koyama

Satoshi Komatsu

Takashi Usui

Takashi Yoshimura

Hideya Saito

Tomoyuki Gotou

Takayuki Tanaka

Yosuke Nishimura

Katsuya Nakai

Tetsuya Higuchi

Teruo Kido

Tomonori Kikuno

Masao Otsuka

Shinichirou Kobayashi

Yasuhiro Utsumi

Yoshinori Hori

Provided is a novel low-GWP mixed refrigerant. A composition comprising a refrigerant, the refrigerant comprising 1,1-difluoroethylene (HFO-1132a) and difluoromethane (R32), wherein HFO-1132a is present in an amount of 26 to 40 mass % based on the total of HFO-1132a and R32, and R32 is present in an amount of 60 to 74 mass % based on the total of HFO-1132a and R32.

Composition containing refrigerant, use of same, refrigerator having same, and method for operating said refrigerator

An object is to suppress disproportionation in a refrigerant comprising HFO-1132(E). Provided as a means for a solution is a method for suppressing a disproportionation reaction of HFO-1132(E), the method comprising operating a refrigeration cycle using a composition comprising a refrigerant, the refrigerant comprising trans-1,2-difluoroethylene (HFO-1132(E)), trifluoroethylene (HFO-1123), and difluoromethane (R32).

Refrigerant-containing composition, use thereof, refrigerator having said composition, and method for operating said refrigerator

An object is to provide a novel low-GWP mixed refrigerant. Provided as a means for a solution is a composition comprising a refrigerant, the refrigerant comprising trans-1,2-difluoroethylene (HFO-1132(E)) and difluoromethane (R32), wherein HFO-1132(E) is present in an amount of 25 to 27 mass % based on the total of HFO-1132(E) and R32, and R32 is present in an amount of 73 to 75 mass % based on the total of HFO-1132(E) and R32.

Composition containing refrigerant, use of same, freezer having same, and method for operating said freezer

The method according to this disclosure is a method for separating an unsaturated hydrocarbon having 2 or 3 carbon atoms and a halogenated unsaturated carbon compound formed by replacing at least one of hydrogen atoms included in the unsaturated hydrocarbon with a fluorine atom, from each other and is a method for selectively adsorbing either the unsaturated hydrocarbon or the halogenated unsaturated carbon compound by a porous coordination polymer that includes a metallic ion having a valence of 2 to 4 and an aromatic anion having 1 to 6 aromatic ring(s).

Separation method for halogenated unsaturated carbon compound

A former unit () as a drying apparatus includes a horizontally oriented main casing (). Space inside the main casing () is divided into four irradiation zones (-). Each of the irradiation zones (-) contains one tray unit (). Each of the tray units () contains four metallic transfer trays () aligned in the vertical direction, with a distance between the transfer trays () set to half a wavelength of a microwave (&#x3bb;/2) or larger. Each of the transfer trays () carries wet PTFE powder. In the irradiation zones (-), the tray units () sequentially move from the first irradiation zone () to the fourth irradiation zone (), and the microwave is laterally applied to the transfer trays ().

Drying apparatus

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 present invention relates to a process for preparing a fluoropolymer containing at least one kind of fluoroolefin, which comprises carrying out polymerization in the presence of a surfactant represented by the formula (1): (wherein Rand Rmay be the same or different respectively, and represent an alkyl group or an alkenyl group, Ris a hydrogen atom, an alkyl group or an alkenyl group, the total carbon number of Rto Ris 2 to 25, Lis a group represented by &#x2014;SO, &#x2014;OSO, &#x2014;PO, &#x2014;OPOor &#x2014;COO, and Mis a monovalent cation). Thereby, polymerization can be carried out with excellent production efficiency in the presence of a small amount of a surfactant, and a fluoropolymer can be prepared without lowering various physical properties such as water resistance by the surfactant.

Process for preparing fluoropolymer

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,

The present invention provides a process for preparing a fluorine-containing polymer having few branched chains and little weight change in high temperatures, which is a new process wherein composition distribution substantially does not occur. The fluorine-containing polymer is prepared by a batch copolymerization process conducted under conditions of reduced temperature of at least 0.95 and reduced pressure of at least 0.80 of the critical constant calculated from critical temperature, critical pressure and composition ratio of each monomer in the gaseous phase of the reaction vessel using the Peng-Robinson formula.

Process for preparing fluorine-containing polymer

A vulcanizable fluorine-containing elastomer composition having excellent stability in molding and kneading property, from which a vulcanized article having a small compression set can be produced in a short period of time. The vulcanizable fluorine-containing elastomer composition comprises a vulcanization agent, a vulcanization aid and a fluorine-containing elastomer having C&#x2014;H bond in its polymer chain, and an optimum vulcanization time T(min) of the composition and a compression set CS (%) of the vulcanized article satisfy the following equations (I) and (II):

Vulcanizable flouroelastomer composition

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Settsu, Japan

Satoshi Tokuno