POLYIMIDE LAMINATED FILM

To provide a polyimide laminated film which suppresses occurrence of cracks in an inner wall of a via in a step of forming the via on a polyimide laminated film for a flexible printed board using a laser, and a method for producing the same.SOLUTION: There are provided a non-thermoplastic polyimide...

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Bibliographische Detailangaben
Hauptverfasser:	HASEGAWA MAKOTO, IDE MASAHITO, MANABE TAKAO
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS GENERAL PROCESSES OF COMPOUNDING LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING WORKING-UP
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Beschreibung
Zusammenfassung:	To provide a polyimide laminated film which suppresses occurrence of cracks in an inner wall of a via in a step of forming the via on a polyimide laminated film for a flexible printed board using a laser, and a method for producing the same.SOLUTION: There are provided a non-thermoplastic polyimide film forming a phase separation structure having a domain of solvent-soluble polyimide of an island structure of 10 μm or less and a domain of non-thermoplastic polyimide of a sea structure in the film; and a method for producing a non-thermoplastic polyimide film that is obtained by imidizing a mixture of a non-thermoplastic polyimide precursor (polyamic acid) and solvent-soluble polyimide to prepare a non-thermoplastic polyimide film, and forming a phase separation structure having a domain of the solvent-soluble polyimide of an island structure of 10 μm or less in the film.SELECTED DRAWING: None 【課題】本発明の目的は、フレキシブルプリント基板用のポリイミド積層フィルムにレーザーを用いてビア形成する工程において、ビア内壁へのクラック発生を抑制するポリイミド積層フィルムおよびその製造方法を提供することである。【解決手段】本発明では、フィルム中に１０μｍ以下の島構造の溶剤可溶性ポリイミドのドメインと海構造の非熱可塑性ポリイミドのドメインを有する相分離構造を形成していることを特徴とする非熱可塑性ポリイミドフィルムおよび、非熱可塑性ポリイミド前駆体（ポリアミド酸）、および、溶剤可溶性ポリイミドとの混合物をイミド化させることにより非熱可塑性ポリイミドフィルムを作製し、そのフィルム中に１０μｍ以下の島構造の溶剤可溶性ポリイミドのドメインを有する相分離構造を形成させることで得られる非熱可塑性ポリイミドフィルムの製造方法により、上記課題を解決することができる。【選択図】なし