Thermosetting amic acid microfine particles, thermosetting imide microfine particles, crosslinked imide microfine particles, and processes for their production
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United States of America Patent
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Dec 25, 2001
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N/A
app pub date -
May 5, 2000
filing date -
Nov 12, 1998
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Abstract
An object of the invention is to provide thermosetting amic acid microfine particles, thermosetting imide microfine particles and crosslinked imide microfine particles of controlled particle shape and size distribution. The invention provides a production technology which comprises mixing a first solution containing a tetracarboxylic anhydride and a C.dbd.C bond-containing acid anhydride with a second solution containing a diamine compound, causing precipitation of thermosetting amic acid microfine particles from the resulting mixture, and further producing thermosetting imide microfine particles and crosslinked imide microfine particles from the thermosetting amic acid microfine particles.
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