Title:
ELECTRET FILM AND ELECTRET COMPRISING SAME
Document Type and Number:
WIPO Patent Application WO/2010/030011
Kind Code:
A1
Abstract:
Disclosed is an electret film (ii) that can stably maintain a high charge state over a long period of time and is formed by injecting charges into a porous resin film (i) having high dielectric strength. Specifically, the electret film (ii) is characterized in that a porous resin film (i) which comprises a core layer (A) having a biaxially stretched porous resin film and a surface layer (B) having a stretched resin film provided on at least one side of the core layer (A), has a water vapor permeation coefficient of 0.1 to 2.5 g∙mm/m2∙24 hr, and has a surface resistivity (at least one surface thereof) of 1 × 1013 to 9 × 1017 Ω is subjected to direct current high-voltage discharge treatment to electretize the film (i). Also disclosed is an electret (iii) comprising the electret film (ii) and an electroconductive layer.
Inventors:
KOIKE Hiroshi (())
小池 弘 (())
小池 弘 (())
Application Number:
JP2009/065961
Publication Date:
March 18, 2010
Filing Date:
September 11, 2009
Export Citation:
Assignee:
YUPO CORPORATION (3 Kandasurugadai 4-chome, Chiyoda-ku Tokyo, 62, 〒1010062, JP)
株式会社ユポ・コーポレーション (〒62 東京都千代田区神田駿河台４丁目３番地 Tokyo, 〒1010062, JP)
KOIKE Hiroshi (())
株式会社ユポ・コーポレーション (〒62 東京都千代田区神田駿河台４丁目３番地 Tokyo, 〒1010062, JP)
KOIKE Hiroshi (())
International Classes:
H01G7/02; B32B5/18; B32B7/02; H04R19/01; H01G7/00; B32B5/18; B32B7/02; H04R19/00
Attorney, Agent or Firm:
OGURI Shohei et al. (Eikoh Patent Firm, 7-13 Nishi-Shimbashi 1-chome, Minato-k, Tokyo 03, 〒1050003, JP)
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