| 摘要 |
PROBLEM TO BE SOLVED: To provide a reinforcing material for air filters excellent in flame retardance without using a flame retardant. SOLUTION: The reinforcing material for air filters comprises a short fiber nonwoven fabric constituted of a core-sheath composite short fiber. The core-sheath composite short fiber is made of a lower melting polymer in the sheath section and a higher melting point polymer in the core section. As the lower temperature polymer, a low melting point polyester is preferable. As the higher melting point polymer, a high melting point polyester is preferable. The sheath section is preferably≥50 mass% in the core-sheath composite short fiber. The fiber length of the core-sheath short fiber is preferably 10-100 mm. The short fiber nonwoven fabric contains≥30 mass% low melting point polymer. The core-sheath composite short fiber is mutually interlaced and bound with fusion of the low melting point polymer. Foreign short fibers other than the core-sheath composite fiber may be contained as constituent fibers. COPYRIGHT: (C)2006,JPO&NCIPI
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