Patent ID: 7253523

Claim:
A package comprising: a die; a first heat sink; a thermal interface material disposed between the die and the first heat sink, the thermal interface material including: a matrix, wherein the matrix exhibits a phase change between about 30° C. and about 100° C.; and a distribution of first interstitial heat transfer structures in the matrix, including a size range from about 5 micron to about 25 micron, and wherein the distribution of first interstitial heat transfer structures occupies from about 5 volume percent to about 95 volume percent of the composition; wherein the die is separated from the first heat sink by less than or equal to about 30 micron; a second heat sink disposed above the first heat sink; and a thermal interface material disposed between the first heat sink and the second heat sink, including: a second heat sink matrix, wherein the second heat sink matrix exhibits a phase change between about 30° C. and about 100° C.; and a distribution of first interstitial heat transfer structures in the second heat sink matrix, including a size range from about 5 micron to about 1,000 micron, and wherein the distribution of first interstitial heat transfer structures occupies from about 5 volume percent to about 95 volume percent of the composition.