POLYIMIDE SOLUTION FOR FORMING POROUS POLYIMIDE FILM, PROCESS FOR PRODUCING POROUS POLYIMIDE FILM, AND POROUS POLYIMIDE FILM

• Main Authors: SHIBATA KENTA, ECHIGO YOSHIAKI, YAMADA MUNENORI, SHIGETA AKIRA
• Format: Patent
• Language: English; Japanese
• Published: 11.01.2018
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

PROBLEM TO BE SOLVED: To provide: a PI solution in which a porous PI film having high porosity, small average pore diameter, as well as excellent mechanical properties and heat resistance can be produced; a process for producing a porous PI film using said solution; and a porous PI film.SOLUTION: A PI solution for forming porous PI film is a PI solution containing a good solvent and poor solvent for a PI and in which, characterized, the PI is a PI comprising an alkylene component in the main chain. The process for producing a porous PI film comprises a step of coating said PI solution on the surface of a substrate, followed by drying at a temperature of 350°C or lower to form a porous PI film. The porous PI film is a porous PI film having a porosity of 20 vol% or more and 90 vol% or less and an average pore diameter of 10 nm or more and 2000 nm or less and in which, characterized, said PI is a PI comprising an alkylene component in the main chain. Said porous PI film in which an active layer is formed on the surface thereof.SELECTED DRAWING: None 【課題】高気孔率であり平均気孔径が小さく、かつ力学的特性や耐熱性に優れた多孔質ＰＩフィルムが得られるＰＩ溶液、この溶液を用いて多孔質ＰＩフィルム製造方法を製造する方法および多孔質ＰＩフィルムを提供する。【解決手段】＜１＞ ＰＩに対する良溶媒と貧溶媒とを含有するＰＩ溶液であって、前記ＰＩが、主鎖中にアルキレン成分を含むＰＩであることを特徴とする多孔質ＰＩフィルム形成用ＰＩ溶液。＜２＞ 前記ＰＩ溶液を、基材表面に塗布後、３５０℃以下の温度で乾燥することにより多孔質ＰＩ被膜を形成する工程を含む多孔質ＰＩフィルムの製造方法。＜３＞ 気孔率が２０体積％以上、９０体積％以下、平均気孔径が１０ｎｍ以上、２０００ｎｍ以下の多孔質ＰＩフィルムであって、前記ＰＩが、主鎖中にアルキレン成分を含むＰＩであることを特徴とする多孔質ＰＩフィルム。＜４＞ 表面に活性層が形成された前記多孔質ＰＩフィルム。【選択図】なし