Compositions and Articles of Wave Transmission and Improved Dimensional Radar Cover Material

A thermoplastic composition comprising:

• (a) from about 10 wt % to about 87 wt % of at least one crystalline or semi-crystalline polymer, wherein the at least one crystalline or semi-crystalline polymer comprises a crystalline or semi-crystalline polyester;
• (b) from about 3 wt % to about 40 wt % of an amorphous polymer resin;
• (c) from about 10 wt % to about 70 wt % of a reinforcing filler;
• wherein:
• the at least one crystalline or semi-crystalline polymer has a lower refractive index than a refractive index of the reinforcing filler when measured using a refractometer,
• the amorphous polymer resin has a refractive index value greater than that of the reinforcing filler,
• the combined weight percent value of all components does not exceed 100 wt %, and all weight percent values are based on the total weight of the composite, and
• the composition exhibits a dissipation factor Df less than the dissipation factor observed for a reference composition in the absence of the amorphous resin.