Varnish, prepreg, and substrate thereof
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United States of America Patent
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-
Jan 3, 2012
Grant Date -
Apr 28, 2011
app pub date -
Oct 25, 2009
filing date -
Oct 25, 2009
priority date (Note) -
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Abstract
A halogen-free varnish includes (A) resin, (B) curing agent, (C) flame inhibitor (flame-retarding agent), (D) accelerator and (E) additives. Resin of (A) has novolac epoxy resin, DOPO-CNE and DOPO-HQ-CNE. Curing agent of (B) includes Benzoxazine resin and phenol novolac resin. Glass fabric cloth is dipped into the halogen-free varnish so as to form a prepreg with better thermal stability, anti-flammability, low absorbent ability and higher curing rate. Furthermore, the prepreg has more toughness.
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