Daikin Industries, Ltd.

Osaka University

Dai-ichi Kogyo Seiyaku Co., Ltd.

Dajkin Industries, Ltd.

Nobuhiko Tsuda

Tetsuo Shimizu

Ryoichi Fukagawa

Masaru Nagato

Takayuki Araki

Chie Sawauchi

Katsuhiko Imoto

Yasuhiko Sawada

Keisuke Tano

Ryuji Iwakiri

Daisuke Tanizawa

Yoshinori Nanba

Takafumi Yamato

Masahiro Kumegawa

Yoshihisa Yamamoto

Seitaro Yamaguchi

Noriyasu Yamane

Takahiro Kitahara

Yoshihiro Yamamoto

Nobuo Mitsuhata

Ryuzi Iwakiri

Tsuyoshi Noguchi

Yoshito Tanaka

Taku Yamanaka

Toshiharu Yagi

Yasushi Yonei

Atsuko Tanaka

Miyuki Iwakiri

Go Nagai

Kohsaku Sakaguchi

Mitsuru Kishine

Shigeru Morita

Taketo Kato

Masahiro Kondo

Takuji Ishikawa

Akinari Sugiyama

Keiko Washino

Yoshiki Tanaka

Makoto Ono

Kenji Adachi

Masayuki Tsuji

Masayoshi Tatemoto

Yoshiki Shimizu

Takahiro Taira

Takeshi Shimono

Masayuki Hashimoto

Ken Okanishi

Hiromichi Momose

Takayuki Hirao

Kazunobu Uchida

Toshirou Miura

Kenjiro Tanimoto

Tomoyuki Fukatani

Junya Iida

Nahoko Izaki

Wade Martin Simpson

Keisuke Matsumoto

Takahiro Sato

Masaki Takakura

The present invention aims to provide an aqueous dispersion that contains particles of a fluoropolymer at high concentrations and has a less variable pH, and in which aggregates are less likely to be generated even after the aqueous dispersion has been stored for a long time. The present invention relates to an aqueous dispersion, including: particles of a fluoropolymer having an average primary particle size of 0.1 to 0.5 &#x3bc;m in an amount of 50 to 70% by mass; a nonionic surfactant in an amount of 2 to 10% by mass based on the amount of the fluoropolymer; and ammonium lauryl sulfate in an amount of 0.0001 to 1% by mass based on the amount of the fluoropolymer, wherein an amount of a fluorine-containing anionic surfactant is less than 10 ppm.

Aqueous fluoropolymer dispersion

The present invention provides an aqueous dispersion of a low-molecular-weight polytetrafluoroethylene (PTFE), which contains an easily removable surfactant, and has a good dispersion stability. Specifically, the present invention provides an aqueous dispersion of a low-molecular-weight PTFE comprising tetrafluoroethylene (TFE) units, or TFE units and modifying monomer units which are copolymerizable with the TFE units, wherein the aqueous dispersion contains from 70 to 9,000 ppm, based on the aqueous dispersion, of a fluorine-containing compound of the formula (1) below:X&#x2014;(CF)&#x2014;Y&#x2003;&#x2003;(1)where X is H or F; m is an integer from 3 to 5; and Y is &#x2014;SOM, &#x2014;SOM, &#x2014;SOR, &#x2014;SOR, &#x2014;COOM, &#x2014;POMor &#x2014;POM, M being H, NHor an alkali metal, and R being an alkyl group having 1 to 12 carbons, and the low-molecular-weight PTFE has an average primary particle size of from 100 to 350 nm.

Aqueous dispersion of low molecular weight polytetrafluoroethylene, low molecular weight polytetrafluoroethylene powder, and method for producing low molecular weight polytetrafluoroethylene

A nonionic surfactant composition including: a nonionic surfactant that contains a molecule having a C-Calkyl group and/or alkenyl group as a hydrophobic group, a polyoxyalkylene chain as a hydrophilic group, no aromatic ring, no C-Calkyl group derived from an alcohol that is produced from a higher olefin derived from a mixture of propylene and butene through an oxo process, and no Calkyl group derived from an alcohol that is produced from a higher olefin derived from a propylene tetramer through an oxo process. The nonionic surfactant has a hydrodynamic radius of 5.0 to 8.0 nm at 40&#xb0; C. in an aqueous solution in which a nonionic surfactant concentration is 0.1 kg/L in the nonionic surfactant composition, the radius being measured by a dynamic light scattering method.

Non-ionic surfactant composition and fluoropolymer aqueous dispersion

The present invention aims to provide a novel method for producing an aqueous dispersion containing non-melt-processable polytetrafluoroethylene particles. The present invention relates to a method for producing an aqueous dispersion containing non-melt-processable polytetrafluoroethylene particles, the method including polymerizing tetrafluoroethylene in an aqueous medium in the presence of perfluoro hexanoic acid or its salt.

Method for producing aqueous polytetrafluoroethylene dispersion

The present invention provides an organosol composition that is stable even in the case that the PTFE particle content is high. The present invention relates to an organosol composition of PTFE particles, comprising PTFE particles (A), a polymer (B), and an organic solvent (S), wherein (1) the polymer (B) is soluble in the organic solvent (S), (2) the amount of the PTFE particles (A) is not lower than 50% by mass of the total amount of the PTFE particles (A) and the polymer (B), and (3) the precipitation ratio of the PTFE particles after 48 hours is not higher than 60% when the total solids concentration of the PTFE particles (A) and the polymer (B) is 5% by mass.

Organosol composition of fluorine-containing polymer

The present invention provides a tetrafluoroethylene polymer aqueous dispersion obtained by carrying out a TFE polymerization in an aqueous medium in the presence of a fluorovinyl group-containing emulsifier, wherein the TFE polymer aqueous dispersion contains a particle comprising a TFE polymer dispersed in the aqueous medium, the fluorovinyl group-containing emulsifier comprises a fluorovinyl group-containing compound, and the TFE polymer aqueous dispersion has a fluorine-containing surfactant content of not higher than 1000 ppm by mass.

Aqueous tetrafluoroethylene polymer dispersion, process for producing the same, tetrafluoroethylene polymer powder, and molded tetrafluoroethylene polymer

The present invention provides an aqueous fluoropolymer dispersion that shows favorable dispersion stability and is less likely to have a pH decrease even after storage for a long period of time. The present invention provides an aqueous fluoropolymer dispersion including: a fluoropolymer; a fluorine free surfactant; at least one organic electrolyte selected from the group consisting of hydroxy monocarboxylic acids, hydroxy dicarboxylic acids, tricarboxylic acids, and amino acids; and a fluorine-containing anionic surfactant containing not more than 7 carbon atoms.

The invention provides a compound which is useful in production of a fluoropolymer and easy to be removed from the produced fluoropolymer, a method of producing the compound, and a method of producing a fluoropolymer using the compound. The invention provides a compound which is represented by Rf&#x2014;CHO&#x2014;CF&#x2014;CHF&#x2014;Rf&#x2014;X, wherein Rfrepresents a fluoroalkyl group containing 1 to 5 carbon atoms, Rfrepresents a fluoroalkylene group containing 1 to 3 carbon atoms, X represents &#x2014;COOM or &#x2014;SOM, and M represents one of H, K, Na, and NH.

Compound, method for producing the same and method for producing fluoropolymer

The present invention provides an aqueous fluororesin dispersion comprising a melt-processable fluororesin which is low in fluorinated surfactant concentration and excellent in dispersion stability even when the concentration of the melt-processable fluororesin is high. The present invention is related to an aqueous fluororesin dispersion comprising a melt-processable fluororesin particle dispersed in an aqueous medium, wherein a concentration of the melt-processable fluororesin is 55 to 75% by mass relative to the aqueous fluororesin dispersion, and a fluorinated surfactant content in the aqueous fluororesin dispersion is not higher than a level corresponding to 100 ppm of the melt-processable fluororesin.

Aqueous fluororesin dispersion and method for producing the same

The present invention provides an aqueous fluoropolymer dispersion having good mechanical characteristics and storage stability and containing substantially no fluorinated surfactant. The present invention is related to an aqueous fluoropolymer dispersion comprising a dispersed fluoropolymer particle with an average primary particle diameter of 50 to 400 nm, a surface layer of the dispersed fluoropolymer particle being obtained by emulsion polymerization of a monomer composition consisting of 99.999 to 98 mole percent of tetrafluoroethylene and 0.001 to 2 mole percent of a modifier monomer, a fluorinated surfactant content being not higher than 50 ppm, a fluoropolymer content being 20 to 75% by mass, and a nonfluorinated nonionic surfactant content being 2 to 15% by mass relative to 100% by mass of the fluoropolymer.

Aqueous fluorine-containing polymer dispersion

An object of the present invention is to provide an aqueous fluoropolymer dispersion inhibited from viscosity rising and excellent in mechanical stability in spite of a low fluorinated surfactant concentration. The invention provides an aqueous fluoropolymer dispersion comprising particles of a fluoropolymer as dispersed in an aqueous medium wherein a fluorinated surfactant (A) having a molecular weight lower than 1000 amounts to not higher than 100 ppm of the mass of the fluoropolymer, the aqueous fluoropolymer dispersion containing an anionic surfactant (B) other than the fluorinated surfactant (A) as well as a water-soluble polymer (C).

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 method of producing a fluoropolymer, wherein polymerization using a carboxylate ester bond-containing carboxylic acid derivative as a surfactant in an aqueous medium to give the fluoropolymer is conducted, the above carboxylate ester bond-containing carboxylic acid derivative has a carboxylate ester bond and &#x2014;COOM (M representing H, NH, Li, Na or K), the above carboxylate ester bond may optionally be substituted by fluorine atom.

Method for producing fluorine-containing polymer, aqueous dispersion of fluorine-containing polymer, 2-acyloxycarboxylic acid derivative, and surface active agent

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Settsu, Japan

Nobuhiko Tsuda