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US 7,842,401 B2Granted
Halogen-free varnish and prepreg thereof
AssigneeIteq Corporation
InventorLi-Chun Chen
Life of this patent
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Abstract
A halogen-free varnish includes epoxy resin, composite curing agent, condensed phosphate, and filler. The composite curing agent includes Benzoxazine (BZ) resin and amino triazine novolac (ATN) resin. The filler has aluminium hydroxide and silica. Glass fabric is dipped into the varnish so as to form a prepreg with better thermal stability, anti-flammability, and low moisture absorption.
Claims14
A halogen-free varnish, comprising:
- composition (A):
- epoxy resin;
- composition (B):
- composite curing agent, wherein the composite curing agent includes benzoxazine resin and amino triazine novolac resin, the benzoxazine resin and amino triazine novolac resin are mixed in a predetermined weight ratio from 1:1 to 1:8;
- composition (C):
- condensed phosphate;
- and
- composition (D):
- filler, wherein the filler includes aluminium hydroxide and silica.
6 more elements
Dependencies are inferred from the claim text.