Hitachi Chemical Company, Ltd.

Yuji Aimono

Toshikazu Narahara

Tohru Koyama

Mineo Nakano

Eiji Omori

Koei Fujita

Hisashi Nishigaki

A semiconductor element excellent in moisture resistance and thermal fatigue properties can be produced by forming a seal coating on at least part of the surface of semiconductor material, said seal coating being a cured resin obtained from an epoxy resin composition comprising (i) an epoxy resin, (ii) an organic dibasic acid dihydrazide and (iii) an imidazole.

Process for producing semiconductor element

A light- and thermosetting resin composition comprising (a) an unsaturated epoxy ester having a resin acid value of 5 or less, or a reaction product having a resin acid value of 5 or less obtained by reacting an unsaturated epoxy ester having a resin acid value of more than 5 with a monoepoxide, (b) one or more .alpha.,.beta.-unsaturated ethylenic monomers, and (c) one or more photosensitizers and peroxides can produce insulated electrical machinery and appliances improved in reliance and performance in a short treating time.

Light- and thermosetting resin composition and insulated electrical

A crosslinkable compound obtained by reacting an aromatic hydrocarbon-formaldehyde resin with an .alpha.,.beta.-unsaturated monocarboxylic acid or an ester thereof has no odor or very slight odor. Said crosslinkable compound can be radical polymerized at a low temperature to give a cured article having excellent electrical insulating properties. Said crosslinkable compound can also be used as one component of a resin composition containing an unsaturated polyester resin or a polybutadiene resin modified with acrylic or methacrylic acid to give an odorless or low-odor resin composition suitable for producing reinforced plastics, paints and varnishes, adhesives, electrical parts, etc.

Odorless or low-odor crosslinkable compound and resin composition

A resinous composition comprising (a) a low-odor crosslinkable monomer obtained by reacting a glycidyl ester of synthetic or vegetable oil fatty acid with acrylic acid or methacrylic acid with heating, and (b) a polybutadiene modified by acrylic acid or methacrylic acid or an unsaturated polyester resin produces almost no or very little odor in the state of a varnish and at drying or curing. Said composition can produce varnishes excellent in mechanical and electrical properties.

Growing community of inventors

Hitachi, Japan

Yuji Aimono