Varnish, prepreg, and substrate thereof
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United States of America Patent
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Jun 26, 2012
Grant Date -
Jul 28, 2011
app pub date -
Jan 27, 2010
filing date -
Jan 27, 2010
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A varnish includes an epoxy resin, a curing agent, an accelerator agent and fillers. The fillers include inorganic mineral powders. The inorganic mineral powders have composition of SiO2 in weight ratio of 55±5% and a composition of aluminum compound in weight above 35%. Glass fabric cloth is dipped into the varnish so as to form a prepreg with better machined-work capability.
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