The silicone-acrylic block copolymers were prepared by free radical copolymerization, in which we used polydimethylsiloxane containing azo groups as a macromolecular initiator and acrylic monomers including functional monomers.
The copolimer solution were coated on substrates by various application methods, subsequently cured with either cross-linking agents or UV light.
Advancing (AA) and receding (BB) contact angles of the resulting films were measured in various inks.
The films were hard enough for a nozzle face, exhibited over 80 of (AA) and 60 of (BB) in an ink, which were superior to those of silicone or fluorinated coating films.
The ink-resistance of the films was evaluated by changes in (AA) and (BB) before and after soaking the films into inks at 60 C for 4 weeks.
The durability of the films were outstanding. The excellent properties were found to be caused by micro domain structure and to be influenced by domain spacing rather than silicone content.