| 摘要 |
PURPOSE: To obtain a heat resistant fiber nonwoven fabric capable of overcoming breakage of a substrate and difficulty of lowering in dielectric constant, having low dielectric constant, excellent in high frequency characteristics and suitable as a substrate for laminated plates by adding a polyimide resin as an adhesive to a heat resistant fiber. CONSTITUTION: This nonwoven fabric is obtained by adding (B) preferably 5-30% adhesive (e.g. polyimide resin, hydrolyzate of alkylsilicate or silicic acid gel) to (A) a heat resistant fiber (e.g. quartz glass fiber, glass fiber, aromatic polyamide fiber, ceramic fiber or alumina fiber) and is especially suitable for polyimide resin laminated plate using a polyimide resin having >=200 deg.C processing temperature as a matrix resin. |
