Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1991-05-22
1994-08-16
Bleutge, John C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
523459, 528 92, 528103, 525524, 525530, 525532, 525533, C08F28300
Patent
active
053387813
ABSTRACT:
An improved flame retardant epoxy molding compound comprises an epoxy, a hardener preferably of the novolac or anhydride type, a catalyst, a mold release agent, preferably a filler, preferably a colorant, preferably a coupling agent, an organic compound containing a higher percent of halogen (which can be part of the resin or the hardener), preferably the polyglycidyl ether of the bromophenol-formaldehyde novolac type, preferably containing at least about 1.0% of bromine by weight of the molding compound, a lower percent of sodium, preferably in the range of 0.03-0.06% by weight of the antimony pentoxide, a lower percent of antimony pentoxide, preferably in the range of .ltoreq. about 0.8% by weight of the molding compound, and an amount of bismuth trioxide .ltoreq. about 4.0% by weight of the molding compound.
The improved flame retardant epoxy molding compounds when used to encapsulated semiconductor devices have improved high temperature stability and compatability, ball-lift performance, live-device performance, cost and lower toxicity compared to similar prior art molding compounds.
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Bleutge John C.
Dexter Electronic Materials Division of Dexter Corp.
Gulakowski Randy
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