Asahi Glass Company, Limited

Nobuyuki Yamagishi

Hidekazu Okamoto

Yasuhiko Matsuoka

Shinya Higuchi

Jun Hoshikawa

Masashi Matsuo

Akihiro Wada

Toshihiko Toma

Takashige Maekawa

Keiichi Ohnishi

Yukio Jitsugiri

Makoto Noshiro

To provide a polytetrafluoroethylene (PTFE) aqueous dispersion, which does not substantially contain ammonium perfluorooctanoate and is excellent in mechanical stability, wettability, permeability and coating property, and its product. A PTFE aqueous dispersion comprising from 15 to 70 mass % of PTFE fine particles having an average particle size of from 0.1 to 0.5 &#x3bc;m, from 1&#xd7;10to 0.5 mass %, based on the mass of the PTFE, of a fluorinated emulsifier of the formula (1): XCFCF(O)CFCFOCFCOOA, wherein X is a hydrogen atom or a fluorine atom, A is a hydrogen atom, an alkali metal or NHand m is an integer of 0 or 1, and from 1 to 20 mass %, based on the mass of the PTFE, of a nonionic surfactant.

Polytetrafluoroethylene aqueous dispersion and its product

A fluororesin aqueous dispersion comprising from 20 to 70 mass % of microparticles of a fluororesin and from 1 to 12 mass %, based on the mass of the fluororesin, of a non-ionic surfactant represented by the formula (1):R&#x2014;O-A-X&#x2003;&#x2003;(1)wherein Ris a Calkyl group, O is an oxygen atom, A is a polyoxyalkylene group comprising from 1 to 3 oxybutylene groups and from 5 to 20 oxyethylene groups, and X is a hydrogen atom or a methyl group.

Fluororesin aqueous dispersion with polyoxyalkylene ester surfactant

The present invention has an object to provide a method for purifying a fluorinated hydroxyl compound of the formula 1 safely in a high yield under industrially practical conditions. Namely, a mixture containing a fluorinated hydroxyl compound of R&#x2014;CRR&#x2014;OH (Formula 1, wherein Ris a Cpolyfluoroalkyl group, and each of Rand Ris a hydrogen atom or a Calkyl group) such as 2,2,3,3-tetrafluoropropanol, and a compound having an unshared electron pair, is distilled by heating in the presence of a solid acid catalyst such as a cation exchange resin catalyst, or by adding a proton source such as water.

Method for purifying a fluorinated hydroxyl compound

A surface modifier comprising a block copolymer obtained by polymerizing a polyfluoroalkyl group-containing compound in the presence of a chain transfer agent composed of a polysiloxane having a mercapto group at its terminal, said block copolymer containing polymer segments of said polysiloxane and polymer segments of said compound, as essential components.

Surface modifier

A low reflectance transparent material having antisoiling properties, which comprises a transparent substrate and a multi-layer coating formed on the substrate, said coating comprising at least one thin layer of a condensation product containing a metal oxide, and a thin layer of a condensation product of a fluorine-containing silicon compound having a polyfluorinated carbon chain or a perfluorocarbon chain, formed thereon.

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Tokyo, Japan

Nobuyuki Yamagishi