Title:
ULTRAFINE POLYPROPYLENE FIBER
Document Type and Number:
Japanese Patent JPH11140719
Kind Code:
A
Abstract:
To obtain an ultrafine polypropylene fiber for nonwoven fabric, produced by melt-spinning method and having a fineness of <0.5 de.
This ultrafine polypropylene fiber is produced by adding 0.001-5 pts.wt. of a nucleation agent to form a β-crystal, to 100 pts.wt. of a homopolypropylene or an ethylene-propylene copolymer containing ≤4 wt.% of ethylene unit and having a melt flow rate of 20-1,500 g/10 min, melt-spinning the obtained polypropylene resin composition under slow-cooling and highly drawing the produced undrawn yarn. A nonwoven fabric produced by using the ultrafine polypropylene fiber has improved liquid-retention as a battery separator and improved dust-collecting and filtering performance as a filter.
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Inventors:
KOBAYASHI KENJI
MATSUMURA TORU
HATA TOSHIKUNI
MATSUMURA TORU
HATA TOSHIKUNI
Application Number:
JP32690797A
Publication Date:
May 25, 1999
Filing Date:
November 12, 1997
Export Citation:
Assignee:
NIPPON POLYCHEM KK
International Classes:
D06M11/00; D01F6/06; D04H1/4291; D04H3/007; D04H3/016; D06M11/84; D06M101/00; D06M101/16; D06M101/18; D06M101/20; (IPC1-7): D01F6/06; D04H1/42; D04H3/00
Attorney, Agent or Firm:
Kenji Kawabi