Expanded Polypropylene Bead for Forming a Dielectric Material and Dielectric Lens Member Formed by the Expanded Polypropylene Beads
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United States of America Patent
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Issued Date -
May 8, 2008
app pub date -
Sep 9, 2005
filing date -
Sep 10, 2004
priority date (Note) -
Abandoned
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Abstract
An expanded polypropylene bead for forming a dielectric material, including a polypropylene resin containing a ceramic in an amount of from 10 to 80 wt %, having an apparent density of from 0.03 to 1.7 g/cm.sup.3, having an intrinsic endothermic peak specific to the polypropylene resin on a DSC curve obtained by a differential scanning calorimetry, and also an endothermic peak at a higher temperature side of the intrinsic endothermic peak, and in that a caloritic value of the endothermic peak at the higher temperature side represents from 2 to 35% of a caloritic value of the peaks of the entire endothermic curve.
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