Thermally conductive polymer compositions and articles made therefrom

摘要

Thermally conductive polymer compositions comprising polymer, highly moisture resistant magnesium oxide, and filler having higher aspect ratio than 5. The compositions are particularly useful for metal/polymer hybrid parts.

主权项

1. A thermally conductive polymer composition, comprising:
(a) about 15 to about 70 weight percent of thermoplastic polymer; (b) about 20 to about 60 weight percent of magnesium oxide; (c) about 5 to about 50 weight percent of filler having an aspect ratio greater than 5; wherein one or more of said (c) fillers are used, selected from the group consisting of glass fibers, wollastonites, glass flakes, talc, mica, and titanium oxide fiber; and (d) about 0.05 to about 15 weight percent of at least one polymeric toughening agent; wherein said (b) magnesium oxide has a weight gain by conditioning at 90° C., 90% RH for 100 hours of less than 0.8%; and, wherein said polymer composition has a thermal conductivity of at least 0.5 W/mK, the percentages being based on the total weight of the composition.