Patent ID: 7166491
Filing Date: 2007-01-23
Classification: H01L

Abstract:
1. A method for forming an integrated circuit assembly for attachment to a circuit board by soldering, the method comprising: applying an underfill solution comprising a thermoplastic resin having a glass transition temperature that is within the range of about −25° C. to about 60° C., a solvent, and a fluxing agent to an integrated circuit device having at least one solder bump on a surface thereof such that the underfill solution is in contact with the at least one solder bump and with the surface of the integrated circuit device; and removing at least a portion of the solvent from the applied underfill solution to thereby yield the integrated circuit assembly for attachment to a circuit board, wherein the integrated circuit assembly comprises the integrated circuit device, the at least one solder bump, and a thermoplastic fluxing underfill in contact with the integrated circuit device surface and in contact with the at least one solder bump.