Patent ID: 6492204
Filing Date: 2002-12-10
Classification: C08G,H01L

Abstract:
A method for the manufacture of an electronic device including putting a circuit board contact and a lead of an integrated circuit chip having a predetermined physical geometry which is substantially constant in the presence of hot solder through a hot solder cycle for electrical connection to each other, and during the course of such hot solder cycle maintaining about said chip in heating contact with said solder a protective composition adhered to said chip, said protective composition comprising a resin subject to expansion with the heat of said solder, said resin having thermostatic crystalline polymer chain portions and thermodynamic amorphous polymer chain portions, the proportion of said thermodynamic polymer chain portions to the total of polymer chain portions being sufficient to absorb the expansion of said resin in the presence of solder heat without commensurate expansion of said thermostatic polymer chain portion so as to maintain the adherence to said chip of said protective composition through said hot solder cycle.