Development of Core Shell Rubber Particles Dispersed in Epoxy Resin

Abstract

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.