POLYMER FOAM FOR ELECTRET AND METHOD FOR PRODUCING THE SAME AND ELECTRET

Title:

POLYMER FOAM FOR ELECTRET AND METHOD FOR PRODUCING THE SAME AND ELECTRET

Document Type and Number:

Japanese Patent JP2007145960

Kind Code:

A

Abstract:

To provide a polymer foam excellent in surface smoothness and uniformity, to provide an electret using the same, and to provide a method for producing the same.

A constituting material containing a substance capable of producing an acid or base with active energy rays and a compound capable of reacting with the acid or base to decomposition-release a low boiling point evaporable substance is foamed to produce a closed cell-having sheet having an average cell diameter of 0.1 to 10 μm and a porosity of 10 to 95% and used for electret. The closed cell-having sheet is subjected to the irradiation of electron beams or to corona discharge to charge the insides of the cells, thus forming the electret.

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Inventors:

JINNO FUMIO
TAKADA TOMOYUKI
KOJIMA JUNYA

Application Number:

JP2005341261A

Publication Date:

June 14, 2007

Filing Date:

November 25, 2005

Export Citation:

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Assignee:

OJI PAPER CO

International Classes:

C08J9/02; C08J9/06; C08J9/36; H01G7/02; H04R19/01; H04R31/00

Domestic Patent References:

JPH11117172A	1999-04-27
JP2005054176A	2005-03-03
JP2004088754A	2004-03-18
JP2004317530A	2004-11-11

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