The antibacterial agents and the mechanism of the bactericidal actions were discussed with the properties of the antibacterial agents, interaction of metal ion and vital organelle, antibacterial action by the photocatalyst and the reaction of antibacterial drugs in the microorganism. The present results demonstrate that metal ion initially resides in the cell membrane area and it readily infiltrates into the interior of the cell. Therefore, the bactericidal functions of the metal ion are its interaction with the ribosome and the ensuring inhibition in the enzymes and proteins essential to APT production. Furthermore, reactive oxygen species, lipid peroxides and free radicals occur to induce the cell damages by the bactericidal or bacteriostatic actions. The primary site of action results in the microorganism as an antimicrobial factor.

For the improvement in the thermal shock performance which was necessary for epoxy resin of electric power equipment, we designed the compounded materials that considered about thermal stress reduction. In the materials design described above, the reduction of elastic modulus and coefficient of thermal expansion (CTE) are important factors. Then, we developed epoxy resins by two different materials design approaches of “the application of the low CTE filler” and “the addition of the low elastic particles”. As low CTE filler, we succeeded in the CTE reduction of the resin by the spherical fused silica. In addition, as low elastic particles, we succeeded in the elastic modulus reduction of resin by the rubber particles of the core shell structure. On these development resins, we confirmed that the thermal shock performance was drastically improved in either materials design approaches by newly established thermal shock test method.

The compression molding silicone rubbers cured by four kinds of organic peroxides were submitted to the post-processing treatments. The processed rubbers were evaluated in the viewpoint for inertness of taste for the industrial beverage use. The treatments, including the postcure at 220°C for up to 16h and the following twice times of hot water-soaking at 95°C for 45min, provided the silicone rubbers with no unpleasant taste. The silicone rubber molded by dicumyl peroxide (C3) was sampled and soaked in water at every stage of treatment. The soaked water was then submitted to the GC/MS analysis for detection of the compounds eluted from the treated rubber. As the results, the eluted compounds as candidates of the unpleasant taste were changed in quality and quantity depending to the conditions of postcure. The unpleasant taste were completely removed by means of combination of the optimized time of postcure with the following hot water-soaking. The post-processed rubbers were found to have sufficient physicochemical properties to work as the functional parts of the industrial beverage equipments.