Title:
ELECTRET AND ELECTRET FILTER
Document Type and Number:
WIPO Patent Application WO/2023/210759
Kind Code:
A1
Abstract:
Conventional electret filters are produced using corona charging or liquid contact charging in which a pre-corona-charged filter is then charged by being brought into contact with water. Nevertheless, electret filters obtained by these methods have insufficient filtration performance and are a problematic alternative for a polypropylene electret. Moreover, electrets produced by liquid contact, which contain an agent for increasing electrification, pose a problem of elevated surface tension and increased wettability with liquids. An electret according to the present invention contains poly-4-methyl-1-pentene, another type of polyolefin, and at least one hindered amine compound and is charged by liquid contact. The above-mentioned problems can be solved by the electret according to the present invention.
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Inventors:
KITAGAWA YOSHIYUKI (JP)
Application Number:
PCT/JP2023/016690
Publication Date:
November 02, 2023
Filing Date:
April 27, 2023
Export Citation:
Assignee:
TOYOBO MC CORP (JP)
International Classes:
B01D39/14; B01D39/16; B03C3/28; D04H3/007
Foreign References:
| JP2008538532A | 2008-10-30 | |||
| JP2022034381A | 2022-03-03 |
Attorney, Agent or Firm:
USFI PATENT ATTORNEYS INTERNATIONAL OFFICE (JP)
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