Low permittivity composite material
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United States of America Patent
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-
Oct 23, 1990
Grant Date -
N/A
app pub date -
Feb 22, 1989
filing date -
Mar 4, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method for production of a composite material comprises the incorporation of a foaming agent into a thermo-fusible fluoro-resin for providing bubbles in the thermo-fusible fluoro-resin. The thermo-fusible fluoro-resin is comminuted to a suitable size, and the comminuted thermo-fusible fluoro-resin is mixed with a polymer for surrounding and supporting the thermo-fusible fluoro-resin with the polymer. The thermo-fusible fluoro-resin is foamed after incorporation of the foaming agent. The comminuted thermo-fusible fluoro-resin is foamed after mixing with the polymer. A composite material having low permittivity comprises hollow bubbles formed of a thermo-fusible fluoro-resin and a polymer material surrounding and supporting the thermo-fusible fluoro-resin forming the hollow bubbles. A first hollow bubble and a second hollow bubble are separated from each other by a layer of the thermo-fusible fluoro-resin of the first bubble, followed by a layer of polymer material, followed by a layer of thermo-fusible fluoro-resin of the second bubble. The ratio of the thickness of the polymer layer to the sum of the layers of the thermo-fusible fluoro-resin is on average from about 0.3 to 3.
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