Arakawa Chemical Industries, Ltd.

Jiro Mizuya

Tatsuya Okumura

Takashi Tanaka

Machio Chihara

Junji Shiigi

A process for preparing polymers having quaternary ammonium groups comprising polymerizing a vinyl monomer component containing a vinyl monomer having a tertiary amino group in the presence of a specific solvent, while quaternizing the tertiary amino group with a quaternizing agent, to produce the vinyl polymers having quaternary ammonium groups in the form of particles dispersed in the solvent, which is possible to easily separate the produced polymers having quaternary ammonium groups from the solvent without requiring a heating step for removing the solvent, and which can produce quaternary ammonium group-containing copolymers having a high content of a hydrophobic vinyl monomer. The quaternary ammonium group-containing copolymers obtained by this process are useful as modifier for plastics, permanent antistatic agent, bactericide or fungicide, chemicals for paper making and water treating agent.

Polymer having quaternary ammonium groups and process for the production

A cleaning method for removing a rosin-base solder flux, the method including bringing a cleaning agent into contact with the flux on a printed wiring board, the cleaning agent including a mixture of

Method for cleaning rosin-base solder flux

The invention provides a cleaning method for removing a rosin-base solder flux, using essentially a mixture of

The invention provides a cleaning agent for removal of a rosin-base flux, the cleaning agent consisting essentially of a surfactant represented by the formula

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Osaka, Japan

Jiro Mizuya