The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 23, 1990
Filed:
Feb. 22, 1989
Takeshi Hoshiko, Koganei, JP;
Junkosha Co., Ltd., Tokyo, JP;
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.