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AssigneeHitachi Chemical Company, Ltd.
InventorsTeiichi Inada, Kazunori Yamamoto, Yasushi Shimada, Yasushi Kumashiro
Estimating the term…
An adhesive comprising (1) 100 parts by weight of a combination of an epoxy resin having a weight average molecular weight of less than 5,000 and a curing agent, (2) 10 to 40 parts by weight of a high-molecular weight component being compatible with the epoxy resin and having a weight average molecular weight of 30,000 or above, (3) 20 to 100 parts by weight of a high-molecular weight component being incompatible with the epoxy resin and having a weight average molecular weight of 30,000 or above, and (4) 0.1 to 5 parts by weight of a cure accelerator. The adhesive is excellent not only in moisture resistance, heat resistance, adhesive strength at high temperature, heat dissipation, reliability of insulation, crack resistance and flexibility but also in circuit filling and tight adhesion, and exhibits suitable flow properties.
An adhesive produced by preparing a varnish of a composition dissolved in a solvent and heating the composition to dry, the composition comprising (1) 100 parts by weight of a combination of an epoxy resin having a weight average molecular weight of less than 5,000 and a curing agent, (2) 10 to 55 parts by weight of a compatible high-molecular weight component selected from the group consisting of a phenoxy resin, a carboxyl group-containing acrylic rubber, a carboxyl group-containing acrylonitrile-butadiene rubber, each having a weight average molecular weight of 30,000 or above, a high-molecular weight epoxy resin having a weight average molecular weight of 30,000 to 80,000 and an ultra high-molecular weight epoxy resin having a weight average molecular weight of more than 80,000, (3) 20 to 100 parts by weight of an incompatible high-molecular weight component having a weight average molecular weight of 30,000 or above and being selected from the group consisting of an epoxy group-containing acrylic rubber, an epoxy group-containing acrylonitrile-butadiene rubber, an epoxy group-containing polybutylene rubber and an epoxy group-containing polybutadiene, and (4) 0.1 to 5 parts by weight of a cure accelerator.
Dependencies are inferred from the claim text.