Flame-retardant sheet and formed article therefrom

Abstract

The object of the present invention is to provide a highly fire resistant fiber sheet and a molded fiber sheet thereof. The fibers of the fire resistant sheet of the present invention contain expandable graphite. When said expandable graphite is exposed to high temperatures, it will expand, giving self-extinguishing properties to said fiber sheet. Since said fire resistant molded fiber sheet is highly fire resistant and nontoxic to humans and animals, it is useful for car or building interiors, and the like.

1 . A resistant fiber sheet wherein unexpanded expandable graphite is contained in fibers.  
   
   
       2 . A fire resistant fiber sheet in accordance with  claim 1 , wherein said fibers are hollow, or hollow fibers are contained in said fibers.  
   
   
       3 . A fire resistant fiber sheet in accordance with  claim 1 , wherein fibers having a low melting point of below 180° C. are mixed into said fibers.  
   
   
       4 . A fire resistant fiber sheet in accordance with  claim 1 , wherein said fibers are bound with a synthetic resin binder.  
   
   
       5 . A fire resistant fiber sheet in accordance with  claim 4 , wherein said synthetic resin binder is water soluble, and water solution of said synthetic resin binder in which said expandable graphite is dispersed, is impregnated into said fiber sheet.  
   
   
       6 . A fire resistant fiber sheet in accordance with  claim 5 , wherein a water soluble synthetic resin is dissolved in said water solution.  
   
   
       7 . A fire resistant fiber sheet in accordance with  claim 5 , wherein said synthetic resin binder is a phenol group resin, and said phenol group resin is sulfomethylated and/or sulfimethylated.  
   
   
       8 . A molded fiber sheet made by molding said fire resistant fiber sheet in accordance with  claim 1  into a prescribed shape.  
   
   
       9 . A molded fiber sheet in accordance with  claim 8 , wherein the ventilation resistance of said molded fiber sheet is in the range of between 0.1 and 100 kP·as/m.  
   
   
       10 . A laminated sheet, wherein other fiber sheet(s) is/are laminated on one or both side(s) of said fire resistant fiber sheet in accordance with  claim 1 , with an intermediating porous thermoplastic resin film.  
   
   
       11 . A molded laminated sheet made by molding said laminated sheet in accordance with  claim 10 , into a prescribed shape.  
   
   
       12 . A molded laminated sheet in accordance with  claim 11 , wherein the ventilation resistance of said molded laminated sheet is in the range of between 0.1 and 100 kPa·s/m.  
   
   
       13 . A fire resistant fiber sheet in accordance with  claim 2 , wherein said fibers are bound with a synthetic resin binder.  
   
   
       14 . A fire resistant fiber sheet in accordance with  claim 3 , wherein said fibers are bound with a synthetic resin binder.  
   
   
       15 . A fire resistant fiber sheet in accordance with  claim 6 , wherein said synthetic resin binder is a phenol group resin, and said phenol group resin is sulfomethylated and/or sulfimethylated.  
   
   
       16 . A molded fiber sheet made by molding said fire resistant fiber sheet in accordance with  claim 2  into a prescribed shape.  
   
   
       17 . A molded fiber sheet made by molding said fire resistant fiber sheet in accordance with  claim 3  into a prescribed shape.  
   
   
       18 . A laminated sheet, wherein other fiber sheet(s) is/are laminated on one or both side(s) of said fire resistant fiber sheet in accordance with  claim 2 , with an intermediating porous thermoplastic resin film.  
   
   
       19 . A laminated sheet, wherein other fiber sheet(s) is/are laminated on one or both side(s) of said fire resistant fiber sheet in accordance with  claim 3 , with an intermediating porous thermoplastic resin film.