Title:
FIBER ASSEMBLY AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JP3672053
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a fiber assembly suitable for a filter of prolonged filtration life by subjecting a nonwoven fabric comprising a polymer blend of a leachable polymer and an unleachable polymer to entanglement between them by water- flow entanglement method followed by leaching treatment.
SOLUTION: A polymer blend comprising at least tow components mutually incompatible containing 15-60wt.% of a water-soluble polymer component such as a polyethylene glycol with a weight-average molecular weight of 15,000-70,000 and 85-40wt.% of an insoluble polymer component such as a polyester elastomer or a polyethylene-chlorotrifuloroethylene copolymer or a fluoropolymer such as vinylidene fluoride polymer is spun-bonded or melt-blown into a nonwoven web or the polymer blend is extruded through a T-die into a film and the film is split to form a nonwoven web from the slit yarns. These nonwoven webs are three-dimensionally interlaced by the water-flow entangling technique, simultaneously the leachable component is removed to give the objective fiber assembly having an average fiber diameter of 0.001-20μm and 4 or more inflection points A in the pore size distribution curve.
Inventors:
Shigeki Tanaka
Application Number:
JP32454095A
Publication Date:
July 13, 2005
Filing Date:
December 13, 1995
Export Citation:
Assignee:
TOYO BOSEKI KABUSHIKI KAISHA
International Classes:
B01D39/04; D01F6/04; D04H1/4391; D04H3/018; D04H3/11; D04H3/147; D04H3/153; D04H3/16; D04H5/03; D06M11/00; D06M11/05; D06M101/00; D06M101/16; D06M101/18; D06M101/20; D06M101/22; D06M101/32; (IPC1-7): D04H1/42; B01D39/04; D04H3/00; D04H3/16; D06M11/05
Domestic Patent References:
| JP4176312A |
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