Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1994-08-08
1996-11-26
Krass, Frederick
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
523466, 525481, 525482, 528 97, 528 98, C08L 6300, C08L 6302
Patent
active
055786600
ABSTRACT:
Disclosed is an epoxy resin composition for sealing semiconductors which comprises as essential components: (A) an epoxy resin containing a biphenyl type epoxy resin represented by the following formula (1) in an amount of 30-100% by weight on the basis of the total amount of the epoxy resin, ##STR1## wherein R.sub.1 -R.sub.8 are the same or different atoms or groups selected from hydrogen, halogens and alkyl groups, (B) a hardener containing a phenolic resin hardener represented by the following formula (2a) or a naphthol resin hardener represented by the following formula (2b) in an amount of 30-100% by weight on the basis of the total amount of the hardener, ##STR2## wherein R.sub.1 -R.sub.8 are the same or different atoms or groups selected from hydrogen, halogens and alkyl groups, R.sub.9 is a group selected from phenyl, naphthyl, anthracenyl and alkyl groups, and n is 1-6, ##STR3## wherein R is a group selected from phenyl, naphthyl, anthracenyl and alkyl groups, and n is 1-6, (C) an inorganic filler, and (D) a hardening accelerator.
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Aihara Takashi
Fujita Hiroshi
Mogi Naoki
Ueda Shigehisa
Krass Frederick
Sumitomo Bakelite Company Limited
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