Claims
- 1. A flame resistance of open-cell polyimide foam product produced from the following method which comprises the steps of:
- adding very finely divided metal oxide particles to water or a highly polar organic liquid to form a gel;
- placing an open-cell synthetic resin foam product in said gel;
- manipulating said foam product so as to substantially entirely fill said cells with gel;
- removing said foam product; and
- drying said foam product;
- whereby metal oxide particles remain dispersed throughout said cells.
- 2. An improved flame resistant open-cell polyimide foam product produced from the following method which comprises the steps of:
- providing a mixture of very finely divided aluminum oxide and silicon dioxide particles, in a weight ratio of about 1:6 and up to about 10 wt % finely divided titanium dioxide particles, based on the total weight of aluminum oxide and silicon dioxide particles;
- adding said mixture of particles to water or a highly polar organic liquid to form a gel;
- placing an open-cell polyimide foam product in said gel;
- manipulating said foam product so as to substantially entirely fill said cells with gel;
- removing said foam product;
- passing said foam product through the nip between a pair of spaced rolls, said spacing selected to squeeze out all but a selected quantity of gel from said foam product; and
- drying said foam product;
- whereby metal oxide particles remain dispersed throughout said cells.
Parent Case Info
This is a divisional of co-pending application Ser. No. 07/373,900 filed on 6/30/89.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
4518717 |
Long et al. |
May 1985 |
|
4520071 |
Noda et al. |
May 1985 |
|
4814356 |
Dongers et al. |
Mar 1989 |
|
Divisions (1)
|
Number |
Date |
Country |
Parent |
373900 |
Jun 1989 |
|