Nippon Telegraph and Telephone Corporation

Satoru Kurosawa

Yoshikazu Ishii

Fumio Yamamoto

Kiyoshi Horii

Shinji Tsuru

Masaya Takahashi

Susumu Fujimori

Mamoru Ishitani

Akira Iwasawa

Tetsuya Maruo

Yoshikazu Honma

A water repellent coating composition comprises a fluororesin powder having a specific surface area ranging from 27 to 48 m.sup.2 /g and a molecular weight ranging from 10,000 to 100,000; an acrylic-silicone binder resin; and a solvent. The fluororesin may be preferably at least one resin selected from polytetrafluoroethylene resins, tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer resins, and tetrafluoroethylene/hexafluoropropylene copolymer resins. The coating composition can be used in various fields including constructions, civil engineering, transportation, communication. The coating films and coated articles produced with the water repellent coating composition exhibit excellent water repellency, antisnow- or antiice-sticking properties, and weatherability.

Water repellent coating composition, and coated films and coated

In an elemental analysis method of analyzing a sample as an analysis target using atoms generated upon dissociation of the sample, a plasma is generated using a gas serving as a plasma source to be supplied in a torch having a conical cylinder thereof. A sample flow obtained by evaporating the sample using the gas as a carrier gas or a sample flow containing a component of the sample is supplied to the plasma. The sample flow or the plasma containing the sample flow is changed into a spiral flow, and the component of the sample is dissociated. The sample is analyzed in accordance with the state of an atom generated by dissociation of the component of the sample. An elemental analysis apparatus is also disclosed.

Elemental analysis method and apparatus

An ion beam is impinged against a solid sample to sputter neutrals. The neutrals thus sputtered are ionized by a UV laser beam to obtain photoions. The photoions are guided to a quadrupole mass analyzer through an ion extraction electrode to extract ions having a desired mass. The extracted ions are made incident upon an ion detector to derive ion pulses. The number of ion pulses is counted by a counter through a signal gate which is opened only during a time period that the photoions reaches the ion detector. A mass of the neutrals having a desired mass is analyzed from the counted value in the digital manner. A time period required for extracting the photoions is extended to perform the pulse counting without being influenced by the secondary ions which causes noises, so that the mass analysis can be performed with a high sensitivity.

Laser ionization sputtered neutral mass spectrometer

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Kokubunji, Japan

Satoru Kurosawa