Gas-permeable filter provided with oil repellency
US-9508971-B2 · Nov 29, 2016 · US
Electret
US10213716B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10213716-B2 |
| Application number | US-201515301902-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 31, 2015 |
| Priority date | Apr 4, 2014 |
| Publication date | Feb 26, 2019 |
| Grant date | Feb 26, 2019 |
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- Title
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- Abstract
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- Assignees and inventors
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Abstract
Official abstract text for this publication.
[Problems] An object of the present invention is to provide an electret with an initial increased electrostatic charge quantity and suppressed attenuation of electrostatic charge to liquid particles. [Means for solving] The electret is obtained by depositing polytetrafluoroethylene having a melting point of 35° C. or higher and 320° C. or lower on a carrier and imparting an electrostatic charge to at least one of the carrier and the polytetrafluoroethylene.
First claim
Opening claim text (preview).
The invention claimed is: 1. An electret, comprising: a carrier, and polytetrafluoroethylene, wherein the polytetrafluoroethylene has a melting point of 35° C. or higher and 320° C. or lower and is deposited on the carrier, and wherein an electrostatic charge is imparted to at least one of the carrier and the polytetrafluoroethylene. 2. The electret according to claim 1 , wherein the carrier contains 0.01 to 15.0 wt. % of at least one of a hindered amine-based additive and a triazine-based additive. 3. The electret according to claim 1 , wherein the carrier contains 0.01 to 15.0 wt. % of a hindered phenol-based additive. 4. The electret according to claim 1 , wherein the electrostatic charge is imparted by a liquid contact charging method. 5. The electret according to claim 1 , wherein the carrier is a fibrous material, and wherein the polytetrafluoroethylene is deposited on the carrier by a solution method or a vapor deposition method. 6. The electret according to claim 1 , wherein the carrier is a melt-blown nonwoven fabric made of a thermoplastic resin having a melting point of 320° C. or lower. 7. A filter comprising the electret according to claim 1 . 8. The electret according to claim 1 , wherein the particle diameter of polytetrafluoroethylene deposited on the carrier is 0.1 nm or more and 10 μm or less.
Assignees
Inventors
Classifications
containing fluorine · CPC title
Oleophobic properties · CPC title
on a layer of the filter · CPC title
Synthetic fibres consisting of macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title
Plant or installations without electricity supply, e.g. using electrets · CPC title
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Frequently asked questions
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- What does patent US10213716B2 cover?
- [Problems] An object of the present invention is to provide an electret with an initial increased electrostatic charge quantity and suppressed attenuation of electrostatic charge to liquid particles. [Means for solving] The electret is obtained by depositing polytetrafluoroethylene having a melting point of 35° C. or higher and 320° C. or lower on a carrier and imparting an el…
- 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 Feb 26 2019 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 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).