Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1989-03-27
1990-06-26
Ryan, Patrick
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428212, 428457, 428458, 4284735, 428901, 174254, 361397, 361398, B32B 900
Patent
active
049371339
ABSTRACT:
Flexible printed circuit base materials of this invention are composed of at least one layer of polyimide resins of low thermal expansion, at least one layer of polyimide resins of high thermal expansion with a higher linear expansion coefficient than that of the foregoing polyimide resins, and at least one layer of a conductor, highly reliable in dimensional stability to temperature changes, adhesive strength, and flatness after the etching, easy to work with in protection of the circuits made by etching.
REFERENCES:
patent: 4513055 (1985-04-01), Leibowitz
patent: 4526835 (1985-07-01), Takahashi et al.
patent: 4569692 (1986-02-01), Butt
patent: 4772496 (1988-09-01), Maeda et al.
Aoi Haruhiko
Miyamoto Kazuya
Satou Seiji
Tokumitsu Akira
Watanabe Hisashi
Nippon Steel Chemical Co. Ltd.
Ryan Patrick
LandOfFree
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