Electret
US-10213716-B2 · Feb 26, 2019 · US
Electret and electret filter
US10940415B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10940415-B2 |
| Application number | US-201615764546-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 21, 2016 |
| Priority date | Oct 2, 2015 |
| Publication date | Mar 9, 2021 |
| Grant date | Mar 9, 2021 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
An electret is disclosed including: a carrier, and polytetrafluoroethylene having a melting point of 35° C. or higher and 320° C. or lower deposited on the carrier, wherein the electret imparts an electrostatic charge to at least one of the carrier and the polytetrafluoroethylene, and has two or more melting point peaks in simultaneous thermogravimetry and differential thermal analysis. An electret filter is disclosed which preferably is used for a filter which requires durability to tobacco smoke. An electret filter is also disclosed having a fluorine-containing component deposited on a fiber surface, wherein an initial QF value is 0.5 mmAq−1 or more in collection efficiency of particles having a particle diameter of 0.3 to 0.5 μm at a wind speed of 5 cm/s, and a filter deterioration rate by tobacco smoke loading is −8/(g/m2) or more.
First claim
Opening claim text (preview).
The invention claimed is: 1. An electret filter having a fluorine-containing component deposited on a fiber surface, wherein: the electret filter has an initial Quality Factor (QF) value of 0.05 Pa −1 or more in collection efficiency of particles having a particle diameter of 0.3 to 0.5 μm at a wind speed of 5 cm/s, and a filter deterioration rate by tobacco smoke loading of −8/(g/m 2 ) or more, and the fluorine-containing component is at least one of a fluorine-containing polycyclic compound having a melting point of 100° C. or higher and a fluorine-containing polymer having a melting point or a glass transition temperature of 100° C. or higher. 2. The electret filter according to claim 1 , wherein the fiber has an effective fiber diameter of 0.1 μm to 20 μm.
Assignees
Inventors
Classifications
Corona discharge or low temperature plasma · CPC title
with halogenated hydrocarbons · CPC title
Rendering the filter material hydrophilic · CPC title
Organic compounds · CPC title
Electret · CPC title
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Frequently asked questions
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- What does patent US10940415B2 cover?
- An electret is disclosed including: a carrier, and polytetrafluoroethylene having a melting point of 35° C. or higher and 320° C. or lower deposited on the carrier, wherein the electret imparts an electrostatic charge to at least one of the carrier and the polytetrafluoroethylene, and has two or more melting point peaks in simultaneous thermogravimetry and differential thermal analysis. An elec…
- Who is the assignee on this patent?
- Toyo Boseki
- What technology area does this patent fall under?
- Primary CPC classification B01D39/1623. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Mar 09 2021 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).