Low temperature curable anisotropic conductive films (ACFs) with photo-active curing agent (PA-ACFs)

Ultra low temperature curable anisotropic conductive films with photo-active curing agent (PA-ACFs) have been newly developed with crosslinking systems using photoactive curing agents. PA-ACFs cannot be cured at temperature higher than 100°C before the UV activation, and the crosslinking systems do not work in fluorescent light. However, after the UV activation, PA-ACFs can be cured at 100°C within 15 seconds. Flex.-on-board (FOB) assembly using PA-ACFs showed the similar adhesion strength and joint resistances than those of the FOB assembly using conventional ACFs.