发明授权
- 专利标题： Hollow polyimide microspheres
- 专利标题（中）： 中空聚酰亚胺微球
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申请号： US316865申请日： 1999-05-21
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公开(公告)号： US5994418A公开(公告)日： 1999-11-30
- 发明人: Erik S. Weiser , Terry L. St. Clair , Yoshiaki Echigo , Hisayasu Kaneshiro
- 申请人： Erik S. Weiser , Terry L. St. Clair , Yoshiaki Echigo , Hisayasu Kaneshiro
- 申请人地址： DC Washington JPX
- 专利权人： The United States of America as represented by the Administrator of the National Aeronautica and Space Administration,Unitika, Ltd.
- 当前专利权人： The United States of America as represented by the Administrator of the National Aeronautica and Space Administration,Unitika, Ltd.
- 当前专利权人地址： DC Washington JPX
- 主分类号： B01J13/04
- IPC分类号： B01J13/04 ; C08J9/02 ; C08J9/32 ; B01J13/02
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/ft.sup.3 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/ft.sup.3 and a compression strength of about 100 to about 1400 pounds/in.sup.2.
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