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Nippon Telegraph and Telephone Corporation

Ntt Advanced Technology Corporation

Mamoru Ishitani

Masaya Takahashi

Susumu Fujimori

Fumio Yamamoto

Shinji Tsuru

Nobuhiro Funakoshi

Yoshiaki Haga

Satoru Kurosawa

Akira Iwasawa

Akira Nohara

Taketoshi Matsuura

Hisao Tabei

A water repellent coating composition includes fine particles having functional groups on their surfaces and having a particle diameter ranging from 10 nm to 1 mm; a coupling agent containing (a) a functional group which is capable of reacting with the functional group of the fine particles and (b) a water repellent fluorinated group; a binder resin for binding the fine particles; and a solvent for the binder.

Water repellent coating composition, method for preparing the same, and coating films and coated articles using the same

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

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Matsudo, Japan

Mamoru Ishitani