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Title:
LAYERED ELECTRET NONWOVEN FABRIC, AND AIR FILTER UNIT AND AIR PURIFIER USING SAME
Document Type and Number:
WIPO Patent Application WO/2021/153296
Kind Code:
A1
Abstract:
A goal of the present invention is to provide: a layered electret nonwoven fabric that has low pressure loss and high trapping efficiency, as well as superior moldability into filter form; and an air filter unit and an air purifier that use said layered electret nonwoven fabric. A layered electret nonwoven fabric according to the present invention is such that a spunbond nonwoven fabric layer constituted of fibers formed from a polyolefin resin (A), and a melt-blown nonwoven fabric layer constituted of fibers formed from a polyolefin resin (B), are layered. The layered electret nonwoven fabric contains 0.1–5% by mass of a hindered amine compound. The fabric weight of the layered electret nonwoven fabric is 5–60 g/m2. The melt-blown nonwoven fabric layer constitutes 1–15% by mass of the mass of the layered electret nonwoven fabric.

Inventors:
YAMANO KOJI (JP)
KOIDE GEN (JP)
Application Number:
PCT/JP2021/001409
Publication Date:
August 05, 2021
Filing Date:
January 18, 2021
Export Citation:
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Assignee:
TORAY INDUSTRIES (JP)
International Classes:
B01D39/16; B01D39/14; B03C3/28; B32B5/26; B32B27/32; D04H3/16
Domestic Patent References:
WO2020022260A12020-01-30
Foreign References:
JP2009275312A2009-11-26
JP2019093367A2019-06-20
JP2009275327A2009-11-26
JP2019151962A2019-09-12
JP2019155244A2019-09-19
JP2013540904A2013-11-07
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