Claims
- 1. A reticulated open-cell polyimide foam product which comprises:
- a reticulated open-cell foam sheet having at least 90 volume percent open space and containing a finely divided microwave absorbing material; and
- a polyimide foam substantially filling said open space, said polyimide foam having substantially uniform density and cell size.
- 2. A reticulated polyimide foam product made by the method that comprises the steps of:
- providing a polyimide reticulated open-foam sheet having at least about 90 volume percent open space and containing a finely divided microwave absorbing material;
- introducing a polyimide foam precursor into said open space;
- heating the resulting assembly to at least the foaming temperature of said polyimide foam precursor; and
- further heating said assembly to a temperature above the vaporization temperature of said polyimide foam;
- whereby said reticulated foam is removed.
Parent Case Info
This is a divisional of co-pending application Ser. No. 07/702,952 filed on May 20, 1991, now U.S. Pat. No. 5,135,959.
US Referenced Citations (8)
Divisions (1)
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Number |
Date |
Country |
Parent |
702952 |
May 1991 |
|