Patent ID: 8568961

Claim:
A method for manufacturing a flip chip package comprising: a) providing a chip having electrically conductive pads on an active surface thereof; b) coating at least a portion the chip with a protectant composition comprising a polymerizable component comprising a thermosetting epoxy resin, at least 50 weight percent of a substantially transparent filler having a coefficient of thermal expansion of less than 10 ppm/° C., a photoinitator, and a solvent carrier, wherein the protectant composition comprises a thixotropic index of less than 1.5; c) masking the coated chip to mask areas where vias through the protectant are desired; d) exposing the masked chip to a light source sufficient to partially crosslink the protectant composition in the unmasked areas; e) removing the uncured portions of the protectant composition thereby creating vias through the protectant composition to the electrically conductive pads on the surface of the chip; f) applying a flux composition in the vias then applying an electrically conductive material to the chip through the vias, wherein the electrically conductive material protrudes from the surface of the protectant composition; g) heating the chip to a temperature sufficient to reflow the electrically conductive material and thermoset the protectant composition.