Hitachi Chemical Company, Ltd.

Houko Kanazawa

Itsuo Watanabe

Motohiro Arifuku

Tohru Fujinawa

Atsushi Kuwano

Atushi Kuwano

Motohiro c/o Goshomiya Works Arifuku

Itsuo c/o Goshomiya Works Watanabe

Tohru c/o Goshomiya Works Fujinawa

A circuit-connecting material which is interposed between circuit electrodes facing each other and electrically connects the electrodes in the pressing direction by pressing the facing electrodes against each other; the circuit-connecting material comprising as essential components (1) a curing agent capable of generating free radicals upon heating, (2) a hydroxyl-group-containing resin having a molecular weight of 10,000 or more and (3) a radical-polymerizable substance. Also provided are a circuit terminal connected structure and a circuit terminal connecting method which make use of such a material.

Circuit-connecting material and circuit terminal connected structure and connecting method

A circuit-connecting material interposed between mutually-facing circuit electrodes, and electrically connecting the electrodes, either by direct contact, or via conductive particles present in the material. The circuit-connecting material features: (1) a curing agent capable of generating free radicals upon heating; (2) a radical-polymerizable substance, and two or more microscopically separated phases. The two or more microscopically separated phases include an elastomer phase of carboxyl-group-containing elastomer and a phenoxy resin phase of a phenoxy resin having a weight average molecular weight of 10,000 or more.

A circuit-connecting material for interposing between circuit electrodes facing each other and electrically connecting the electrodes, after curing by heat and pressure, either by direct contact or via conductive particles present in the material. The circuit-connecting material features the following essential components: (1) a curing agent capable of generating free radicals upon heating, (2) a phenoxy resin having a weight average molecular weight of 10,000 or more, and that is chemically modified by a carboxyl-group-containing elastomer, and (3) a radical-polymerizable substance.

A circuit terminal connected structure and a circuit terminal connecting method are provided. Both the structure and the method feature a circuit connecting material formulated with the following components: a curing agent capable of generating free radicals upon heating; an acrylate or methacrylate radical polymerizable substance; and either an acrylic rubber or a maleimide radical polymerizable substance having at least two maleimide groups per molecule. In some embodiments, the curing agent features a 10-hour half life temperature of 40&#xb0; C. or above and a 1-minute half-life temperature of 180&#xb0; C. or below. In other embodiments, the circuit connecting material includes conductive particles. In additional embodiments, the circuit connecting material includes a hydroxyl-group-containing resin having a weight average molecular weight of 10,000 or more.

Electronic circuit including circuit-connecting material

A circuit-connecting material which is interposed between circuit electrodes facing each other and electrically connects the electrodes in the pressing direction by pressing the facing electrodes against each other; the circuit-connecting material comprising as essential components (1) a curing agent capable of generating free radicals upon heating, (2) hydroxyl-group-containing resin having a molecular weight of 10,000 or more and (3) a radical-polymerizable substance. Also provided are a circuit terminal connected structure and a circuit terminal connecting method which make use of such a material.

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Tsukuba, Japan

Houko Kanazawa