Pressure-sensitive adhesive for temporarily securing electronic devices

摘要

A pressure-sensitive adhesive for use in temporarily securing electronic devices, particularly surface-mounting devices onto a printed circuit board in position during soldering, thereby preventing the devices from dropping from the board. The pressure-sensitive adhesive consists essentially of a resinous material having a dynamic modulus of elasticity in the range of from 104 to 109 dyne/cm2 as measured at the soldering temperature of the electronic devices with a frequency of applied vibrations of 10 Hz. Preferably, the resinous material has a dynamic modulus of elasticity in the range of from 104 to 107 dyne/cm2 and a value for tan delta of greater than 0.2 as measured under the above conditions. In this case, the pressure-sensitive adhesive exhibits a self-aligning effect whereby electronic devices mounted out of position on the board are forced to move toward the proper positions by the action of the surface tension of a molten solder.