Hitachi Chemical Company, Ltd.

Takayuki Suzuki

Yoshiyuki Tsuru

Shigeharu Arike

Yasuo Miyadera

Hidekazu Matsuura

Eiichi Shinada

Masashi Tanaka

Kaori Ikeda

Yoshihide Iwasaki

Shinjirou Miyashita

Takashi Sugiyama

A multiple wire printed circuit board including printed conductor circuit layers, adhesive layers with wires having insulating coating embedded and fixed therein, insulating layers, and connecting through-holes formed at locations where connections will be made, wherein the conductor circuit layers are insulated from other circuit conductors, and the difference in glass transition point between each adhesive layer and the adjoining insulating layer is within the range of 60.degree. C., remains free of peel and voids despite heat history applied to the board, and is capable of high-density wiring, multiplication of circuit layers and a reduction of the number of the manufacturing steps.

Multiple wire printed circuit board and process for making the same

A process for forming a multilayer printed wiring board comprising integrally laminating a plurality of insulating circuit boards having circuits formed on insulating substrates and interlaminar insulating layers sandwiched between adjacent insulating circuit boards, and forming via holes for making electrical connection between two or more layers of circuits. Where the difference between the glass transition point of an interlaminar insulating layer and that of the adjoining insulating substrate is not greater than 60.degree. C., proof against exfoliation due to heat history of the board and high reliability of insulation and through-hole connection is achieved. The interlaminar insulating layers desirably are B-staged and have a B-stage resin flow of less than 1%.

Multilayer printed wiring board

A multilayer printed wiring board comprising a plurality of interlaminar insulating layers, a plurality of insulating circuit boards having circuits formed on the insulating substrates, and via holes for making electrical connection between two or more layers of circuits, wherein the difference between the glass transition point of an interlaminar insulating layer and that of the adjoining insulating substrate is not greater than 60.degree. C., is proof against exfoliation due to heat history of the board and has high reliability of insulation and through-hole connection.

A polymide comprises structural units represented by the following formula: ##STR1## wherein Ar is a group consisting of 10-90 mole % of a first specific structural sub-unit and 90-10 mole % of a second particular structural sub-unit. A process for the production of the polyimide and a thermosetting resin composition comprising the polyimide and a particular polymaleimide are also disclosed.

Polyimides, thermosetting resin compositions containing the polyimides,

A polyimide comprises structural units represented by the following formula: ##STR1## wherein Ar is a group consisting of 10-90 mole % of a first specific structural sub-unit and 90-10 mole % of a second particular structural sub-unit. A process for the production of the polyimide and a thermosetting resin composition comprising the polyimide and a particular polymaleimide are also disclosed.

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Shimodate, Japan

Takayuki Suzuki