Core-Shell Rubber particles（CSR）uniformly dispersed into liquid thermosetting resin like an epoxy resin at a high concentration（25% to 45%），which has been previously considered difficult to achieve, was launched commercially by our unique production process. The master batch product is effective as a toughener for epoxy structural adhesives, and it has features such as（1）high adhesive strength while not reducing heat resistance of epoxy resin, （2）excellent impact resistance over a wide operating temperature range, and（3）stable toughness improvement effect regardless of curing temperature. The above impact resistance could be improved by introducing a reactive group on the shell phase of CSR. Besides, the toughness improvement effect of CSR was evaluated as one-component and two-component adhesive, and in both cases it could be remarkably increased by controlling the crosslinked structure of the cured epoxy resin.

Polypropylene（PP）is generally used as a mixture with fillers to improve its mechanical properties. The quality of the adhesion at the interface between PP and filler is crucial to this end. Thus, a third component is mixed into the composite to improve the interfacial adhesion. We here examine an effect of maleic anhydride grafted PP （PP-g-MA） on mechanical properties of PP composites filled with silica（SiO2）or alumina（Al2O3） particles. Although the tensile stress at yield for the SiO2 composites slightly increased with a concentration of maleic anhydride in the system（CMA），that for the Al2O3 ones remarkably increased with CMA and reached a plateau value. We successfully demonstrate that the interfacial adsorbed layer of PP-g-MA was well evolved onto the Al2O3 filler, resulting in the improvements of the mechanical properties of the PP composites.

When a solid is partially immersed in a liquid, the fluid surface near the contact line generally rises, thereby forming meniscus. It is well known that meniscus formation strongly depends on the surface topography of solids, but most studies have been conducted on low viscosity liquids and there have few studies using high viscosity ones, especially viscoelastic ones which are the main components of adhesives. In this study, we investigated the influence of the shape and curvature of the solid surface on the meniscus formation by viscoelastic butadiene oligomer, using theoretical calculations and experiments. As a result, we found that the size of the meniscus was limited by the curvature of the solid surface. The theoretical calculations showed relatively good agreement with the experimental results, indicating the possibility of applying the equations to viscoelastic materials.