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US 5,181,097 AGranted
Plastic molded type electronic device
AssigneeHitachi, Ltd.
InventorsMasatsugu Ogata, Yasuhide Sugawara, Masanori Segawa, Hidetoshi Abe, Osamu Horie
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AssigneeHitachi, Ltd.
InventorsMasatsugu Ogata, Yasuhide Sugawara, Masanori Segawa, Hidetoshi Abe, Osamu Horie
Estimating the term…
The phenol resin molding composition used in the present invention is obtained by subjecting a resol-type phenol resin to purification until, when the resin is extracted by heating with 10 times the amount of hot water at 120.degree. C. for 100 hours or more, the extract has an electric conductivity of 100 .mu.S/cm or less, a pH of 4-7 and a halogen ion content of 10 ppm or less, then preparing a composition comprising a resin component consisting of said resol-type phenol resin and a cure rate controlling agent incorporated therewith, optionally incorporating a filler into said composition, kneading the resulting mixture, and then grinding the kneaded mixture. The composition has a good moldability and, when used for resin-sealing of electronic devices or semiconductor devices and transfer-molding of electronic devices using resin, exhibits an excellent adhesive property, electric properties, moisture resistance and heat resistance.
A plastic molded type electronic device, wherein the device is sealed with a phenolic resin molding composition comprising a resin component consisting of a resol-type phenol resin and at least one epoxy resin in a weight ratio of from 75:25 to 95:5, the resin component having been purified until it gives, when extracted by heating with 10 times the amount of hot water at 120.degree. C. for 100 hours or more, an extract having an electric conductivity of 100 .mu.S/cm or less, a pH of 4-7 and a halogen ion content of 10 ppm or less.
A plastic molded type electronic device, wherein the device is transfer-molded with a phenolic resin molding composition comprising a resin component consisting of a resol-type phenol resin and a modifier in a weight ratio of from 75:25 to 95:5, the resin component having been purified until it gives, when extracted by heating with 10 times the amount of hot water at 120.degree. C. for 100 hours or more, an extract having an electric conductivity of 100 .mu.S/cm or less, a pH of 4-7 and a halogen ion content of 10 ppm or less.
Dependencies are inferred from the claim text.