Abstract: Provided are an ink composition for an etching resist, a method of forming an etching resist pattern using the ink composition, and a method of forming a microchannel using the ink composition. The ink composition is suitable for forming a micro pattern due to its poor spreading on the substrate and is suitable for etching-resist for copper of a printed circuit board and deep etching a stainless steel substrate due to its excellent chemical properties that allow it to resist an etching solution.

Abstract: The invention provides a process for the production of a compound of formula (I): wherein P1 and P2, which may be the same or different, are amino protecting groups, which comprises protection of a compound of formula (II) in solution phase continuous operation mode. This confers advantages over batch mode operation. The process is usually conducted in reaction equipment adapted for use in continuous processing mode, for example comprising one or more static mixers or a plug flow reactor. Preferably, the plug flow reactor comprises a jacketed tubular reactor fitted inside with internal mixing elements which continually split and remix the reaction streams promoting mass and heat transfer, whereby a uniform plug flow profile with turbulent fluid flow is achieved. The invention also provides a process for production of the antibacterial compound gemifloxacin or a pharmaceutically acceptable salt and/or hydrate thereof, comprising converting a compound of formula (I).

Abstract: Provided are an ink composition for an etching resist, a method of forming an etching resist pattern using the ink composition, and a method of forming a microchannel using the ink composition. The ink composition is suitable for forming a micro pattern due to its poor spreading on the substrate and is suitable for etching-resist for copper of a printed circuit board and deep etching a stainless steel substrate due to its excellent chemical properties that allow it to resist an etching solution.

Abstract: The invention provides a process for the production of a compound of formula (I): wherein P1 and P2, which may be the same or different, are amino protecting groups, which comprises protection of a compound of formula (II) in solution phase continuous operation mode. This confers advantages over batch mode operation. The process is usually conducted in reaction equipment adapted for use in continuous processing mode, for example comprising one or more static mixers or a plug flow reactor. Preferably, the plug flow reactor comprises a jacketed tubular reactor fitted inside with internal mixing elements which continually split and remix the reaction streams promoting mass and heat transfer, whereby a uniform plug flow profile with turbulent fluid flow is achieved. The invention also provides a process for production of the antibacterial compound gemifloxacin or a pharmaceutically acceptable salt and/or hydrate thereof, comprising converting a compound of formula (I).