Matsushita Electric Industrial Co., Ltd.

Kenichi Nobuta

Toru Shiino

Hiroshi Onishi

Yoshikazu Yamagata

Hiroaki Takezawa

Tokihiko Shimizu

Tohru Shiino

A cleaning agent for removing a residue of soldering flux, which essentially consists of mono-, di-, or tri-alkylene glycol mono branched C.sub.3 -C.sub.5 alkyl ether, which can remove with high safety both ionic residues and resinous materials contained in a soldering flux, which remain on the surface of a soldered electronic substrate. The cleaning agent of the present invention does not adversely affect the insulation and materials used in an electronic device.

Cleaning agent for removing soldering flux based on alkylene glycol

A flux for soft soldering is disclosed. It comprises a chelating agent as an activator for facilitating a connection of a conductor metal to a soft solder by removing an oxide film naturally formed on the surface of the conductor metal, and for securing insulating reliability after soft soldering by forming complexes with copper and tin which are insulating substance, and a solvent capable of dissolving the chelating agent and further preferably evaporating at soldering process.

Flux for soft soldering

A solvent for polystyrene, having an excellent dissolving ability and chemical stability with no influence on the operating environment, is disclosed. A relatively simple recycling or reutilizing process of both the polystyrene foam and the solvent is also disclosed. The solvent comprises at least one member selected from the group consisting of such a glycol ether compound as diethylene glycol dimethyl ether, diethylene glycol diethyl ether or dipropylene glycol dimethyl ether, and such a fatty acid dialkyl ester compound as dimethyl succinate, dimethyl glutarate or dimethyl adipate. These compounds have a flash point of 100.degree. C. or higher, and can be made nonflammable by addition of water.

Solvent for polystyrene, method for reducing volume of polystyrene foam

A cleaning agent composition is disclosed which is excellent in removing ability of the soldering flux, wax and machine oil, easy in waste water disposal, and free from the global environmental concern, allowing safe operation. The composition comprises: A) at least one member selected from the group consisting of propylene glycol monoalkyl ether having a C.sub.4-6 alkyl group and dipropylene glycol monoalkyl ether having a C.sub.3-6 alkyl group, B) at least one member selected from the group consisting of methanol, ethanol, 1-propanol and 2-propanol, and C) water.

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Ikoma, Japan

Kenichi Nobuta