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.
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机译：本发明的目的是提供：层状驻极体无纺布，具有低压损失和高捕获效率，以及对过滤形式的优异的可模塑性;和空气过滤器单元和使用所述层状驻极体无纺布的空气净化器。根据本发明的层状驻极体无纺布使得由由聚烯烃树脂（A）形成的纤维构成的纺粘非织造织物，以及由由聚烯烃树脂（B）形成的纤维构成的熔喷非织造织物层，分层。层状驻极体无纺布含有0.1-5质量％的受阻胺化合物。层状驻极体无纺布的织物重量为5-60g / m 2 。熔喷非织造织物层构成1-15质量％的层状驻极体无纺布的质量。
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