Polymer electronic device package having high thermal conductivity and dielectric strength
View Patent ↗A polymer composition having high thermal conductivity and dielectric strength is provided. The polymer composition comprises a base polymer matrix and a thermally-conductive, electrically-insulating material. A reinforcing material such as glass can be added to the composition. The polymer composition can be molded into packaging assemblies for electronic devices such as capacitors, transistors, and resistors.
1. An electronic device package assembly, comprising:
an electronic device having a front side, rear side, left side, right side, bottom side, top side and at least two wire leads, said wire leads emanating from said electronic device; and
a molded cover injection molded about said electronic device and in thermal communication with at least said front side, rear side, left side, right side, and top side of said electronic device,
said wire leads emanating from said electronic device and protruding through said molded cover,
said molded cover comprising a thermally-conductive, electrically-insulating polymer composition having a thermal conductivity of at least 22 W/m°K, comprising a uniform mixture of:
about 30% by weight of a polymer matrix,
about 60% by weight of a thermally-conductive, electrically-insulating ceramic material dispersed intimately throughout said polymer matrix and
about 10% by weight of a reinforcing material dispersed intimately throughout said polymer matrix.
2. The package assembly of claim 1 , wherein the polymer matrix is a thermoplastic polymer.
3. The package assembly of claim 2 , wherein the polymer matrix is polyphenylene sulfide.
4. The package assembly of claim 1 , wherein the thermally-conductive, electrically-insulating ceramic material is selected from the group consisting of alumina, calcium oxide, titanium oxide, silicon oxide, zinc oxide, silicon nitride, aluminum nitride, boron nitride, and mixtures thereof.
5. The package assembly of claim 1 , wherein the reinforcing material is glass.