Daikin Industries, Ltd.

Daikin Kogyo Co., Ltd.

Masayoshi Tatemoto

Masayasu Tomoda

Takuya Arase

Toshiharu Yagi

Yuji Yutani

Koji Fujiwara

Yutaka Ueta

Shigeru Morita

Tadashi Ino

Masahiko Oka

Yasuyoshi Furukawa

Tsuneo Nakagawa

Junichi Sako

Tetsuo Shimizu

Tsuyoshi Noguchi

Nobuyuki Tomihashi

Nobuhiko Tsuda

Yoshito Tanaka

Takayuki Nakamura

Katsutoshi Yamamoto

Shoji Kawachi

Yoshiki Shimizu

Takeshi Suzuki

Yoshihisa Yamamoto

Takuji Ishikawa

Sinji Tamaru

Yoshio Amimoto

Takayuki Tanaka

Kenji Ishii

Yoshihide Higashihata

Toshihiko Amano

Yoshio Negishi

Kohsaku Sakaguchi

Hideo Kano

Hirofumi Onogi

Yuji Tanaka

Hitoharu Hachisuka

Keizo Desaki

Sadaatsu Yamaguchi

A method for producing a fluoropolymer dispersion where a fine particle containing a fluoropolymer is dispersed in an aqueous dispersion medium, the fluoropolymer having a sulfonic acid group, and the method including a polymerization reaction step of emulsion polymerizing a fluorovinyl ether derivative and a fluorine-containing ethylenic monomer to give a fluoropolymer precursor, a hydrolysis step of hydrolyzing, in an aqueous medium, &#x2014;SOX, where Xrepresents a halogen atom, which the fluoropolymer precursor has thereby to give the fluoropolymer, the fluorovinyl ether derivative being represented by the following general formula (II):CF&#x2550;CF&#x2014;O&#x2014;(CFCFY&#x2014;O)&#x2014;(CFY)-A&#x2003;&#x2003;(II)wherein Y, n, Y, m and Aare as defined herein, the fluoropolymer precursor having a fluorovinyl ether derivative unit content of 5 to 40 mole percent, and the fluoropolymer dispersion being produced without drying the fluoropolymer precursor and the fluoropolymer.

Fluoropolymer dispersion and process for producing fluoropolymer dispersion

A fluoropolymer liquid composition including a fluoropolymer liquid (A) which includes a liquid medium and a crosslinkable functional group-containing crosslinkable fluoropolymer. The fluoropolymer liquid (A) is a fluoropolymer liquid dispersion (AD) having, dispersed in a liquid dispersion medium, particles of a crosslinkable fluoropolymer (PD) containing acid/acid salt groups or organic groups capable of undergoing hydrolysis and thus being converted to carboxyl groups, or a fluoropolymer solution (AS) having, dissolved in a fluorosolvent or an alcohol/water mixed solvent, a crosslinkable fluoropolymer (PS) containing acid/acid salt groups or acid/acid salt groups precursors. Further, the crosslinkable functional group is a cyano group, &#x2014;I or &#x2014;Br.

Liquid fluoropolymer composition and process for producing crosslinked fluorochemical

The present invention provides a process for producing a fluorinated ionomer, comprising copolymerizing, in the presence of a polymerization initiator, (i) a compound represented by Formula (I)(M)OSOCFY(CF)O(CFXCFO)CF&#x2550;CF&#x2003;&#x2003;(I)wherein M is H or a metal with a valence of L (L is 1, 2 or 3), X is F, Cl or CF, Y is halogen, m is 1 to 5, and n is 0 to 5, (ii) tetrafluoroethylene and (iii) at least one third monomer selected from the group consisting of hexafluoropropylene, chlorotrifluoroethylene, vinylidene fluoride, CF&#x2550;CFORf (Rf is Cto Cperfluoroalkyl) and ethylene. The present invention further provides a method for purifying and concentrating a fluorinated ionomer, comprising ultrafiltration or dialysis of a fluorinated ionomer solution or dispersion, and a method for forming a film of the fluorinated ionomer.

Process for producing fluoroionomer, method for purification and concentration of the ionomer, and method of film formation

Process for producing perfluoro(vinyl ether) sulfonic acid derivative

A compound of the formula (1): FSO,CFXCF,O(CFXCF,O),CF&mdash;(CF,Y)COF in which X is a fluorine atom, a chlorine atom or a trifluoromethyl group, Y is a fluorine atom, a chlorine atom, a bromine atom or an iodine atom, and n is a number of 0 to 5, preferably 0, 1 or 2, is converted to a compound of the formula (2): MOSO,CFXCF,O(CFXCF,O),CF(CF,Y)COOM,in which X, Y and n are the same as defined above, and M and M,independently represent an alkali metal atom or an alkaline earth metal atom, and then a compound of the formula (2) is pyrolyzed at a temperature of 150 to 250&deg; C. to obtain a compound of the formula (3): ASO,CFXCF,O(CFXCF,O),CF&boxH;CF,in which A is MO&mdash;, a hydroxyl group or a fluorine atom, and X and n are the same as defined above.

Process for the producing perfluorovinyl ethersulfonic acid derivatives and copolymer of the same

Novel silicon-containing organic fluoropolymers which are appliable to materials over a wide range and which have excellent antifouling property. The silicon-containing organic fluoropolymer of the invention is represented by the general formula and has a number average molecular weight of from 5&times;10,to 1&times;10,:

Silicon-containing organic fluoropolymers and use of the same

Fluorine-containing copolymer, process for preparing the same and

A polymer comprising at least one polymer chain is produced by polymerizing, in the presence of a radical generating source and an iodide compound, at least one monomer M.sub.1 having a radically polymerizable unsaturated bond between a carbon atom and an iodine atom constituting a carbon-iodine bond of the iodide compound to form at least one polymer chain between the carbon atom and the iodine atom, wherein the polymerization reaction is carried out in the presence of a monomer M.sub.2 which is different from the monomer M.sub.1 and has a larger addition reactivity with a carbon radical which is generated by cleavage of the carbon-iodine bond of the iodine compound than that of the monomer M.sub.1.

Process for preparing polymer

a fluorine-containing block copolymer comprising at least one soft segment which comprises chlorotrifluoroethylene and vinylidene fluoride and at least one hard segment which comprises a fluorine-containing crystalline polymer, which copolymer has good flexibility and transparency and useful as a material for an artificial lens.

Fluorine-containing block copolymer and artificial lens comprising the

An iodine-containing compound consisting of at least two repeating units selected from the formulae:

Iodine-containing compound, preparation thereof and block copolymer

A thermoplastic elastomer composition comprising a thermoplastic elastomeric block or graft polymer comprising at least one hard segment and at least one soft segment and a vulcanizing agent, which can be molded under high shearing stress at a temperature lower than a melting or softening point of the hard sements under shear force to give a molded article having a substantially smooth surface.

Thermoplastic elastomer composition, method for molding the same and

Modified polytetrafluoroethylene unsintered powder of which has sintering-densification indexes P.sub.10, P.sub.25 and P.sub.50 of not larger than 0.2, which is suitable for producing a porous molding article.

Modified polytetrafluoroethylene and process for preparing the same

Novel polymer and its preparation and use

A fluorine-containing copolymer comprising repeating units derived from an olefin of the formula: ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are the same or different and are each a hydrogen atom or a fluorine atom, or one is a chlorine atom and the remainder are fluorine atoms, and repeating units derived from a vinylphosphonic acid derivative of the formula: ##STR2## wherein R groups are the same or different and are each an alkyl group having 1 to 12 carbon atoms, an alkenyl group having 2 to 12 carbon atoms or a phenyl group, and n is 0, 1 or 2, which has good hydrophilicity.

Novel fluorine-containing copolymer

Novel iodine-containing compound, preparation thereof and block

Growing community of inventors

Osaka, Japan

Masayoshi Tatemoto