发明名称 |
Hollow polyimide microspheres |
摘要 |
A shaped article composed of an aromatic polyimide has a hollow, essentially spherical structure and a particle size of about 100 to about 1500 mu m, a density of about 1 to about 6 pounds/ft3 and a volume change of 1 to about 20% by a pressure treatment of 30 psi for 10 minutes at room temperature. A syntactic foam, made of a multiplicity of the shaped articles which are bounded together by a matrix resin to form an integral composite structure, has a density of about 3 to about 30 pounds/ft3 and a compression strength of about 100 to about 1400 pounds/in2.
|
申请公布号 |
US5994418(A) |
申请公布日期 |
1999.11.30 |
申请号 |
US19990316865 |
申请日期 |
1999.05.21 |
申请人 |
THE UNITED STATES OF AMERICA AS REPRESENTED BY THE ADMINISTRATOR OF THE NATIONAL AERONAUTICA AND SPACE ADMINISTRATION;UNITIKA, LTD. |
发明人 |
WEISER, ERIK S.;ST. CLAIR, TERRY L.;ECHIGO, YOSHIAKI;KANESHIRO, HISAYASU |
分类号 |
B01J13/04;C08J9/02;C08J9/32;(IPC1-7):C08J9/32;B01J13/02 |
主分类号 |
B01J13/04 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|