Seimi Chemical Co., Ltd.

Other

Asahi Glass Company, Limited

Yutaka Fukatsu

Seisaku Kumai

Ryota Tokura

Syunji Odaka

Shunji Odaka

Harumi Mihara

A process for recovering fluoropolymers, which comprises contacting an ion exchange membrane comprising a fluoropolymer having carboxylic acid groups (hereinafter referred to as a C-polymer) and a fluoropolymer having sulfonic acid groups (hereinafter referred to as a S-polymer) and having inorganic particles deposited on the surface, with a solvent to let it swell and to remove the inorganic particles from the surface, then, contacting it with a solvent which is a good solvent for the S-polymer and a poor solvent for the C-polymer to obtain a solid composed mainly of the C-polymer and a solution having the S-polymer dissolved therein, and recovering them by solid-liquid separation.

Process for recovering fluoropolymers

A composition for preventing creeping for a flux for soldering, which is free from a problem from the viewpoint of the global environment or working environment is provided. The composition comprising a polymer (A) containing the polymer units (a ) derived from an unsaturated ester containing a polyfluroalkyl group and the polymer units (b ) derived from a compound containing a silicon atom and an unsaturated group, and an aqueous medium (B), further optionally including a fluorine type surfactant (c).

Composition for preventing creeping of a flux for soldering and use thereof

A process for recovering fluoropolymers, which comprises contacting an ion exchange membrane comprising a fluoropolymer having carboxylic acid groups (hereinafter referred to as a C-polymer) and a fluoropolymer having sulfonic acid groups (hereinafter referred to as a S-polymer) and having inorganic particles deposited on the surface, with a solvent which is a good solvent for the C-polymer and a good solvent for the S-polymer, to separate a solution having the C-polymer and the S-polymer dissolved therein, and the inorganic particles, then esterifying the C-polymer in the solution to form precipitate of an ester of the C-polymer, and fractionating and recovering the precipitate and a solution having the S-polymer dissolved therein by solid-liquid separation.

The present invention relates to a composition for preventing creeping of a flux for soldering, which is free from a problem from the viewpoint of the global environment or working environment. The present invention provides a composition for preventing creeping of a flux for soldering, consisting of a composition comprising a polymer containing polymer units of an unsaturated ester containing a polyfluoroalkyl group, a fluorine-type surfactant and an aqueous medium. Further, the present invention provides a method for soldering by means of the composition. Furthermore, the present invention provides an electronic part or printed board soldered by the method. Still further, the present invention provides an electric appliance employing such an electronic part or printed board.

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Kanagawa, Japan

Yutaka Fukatsu