ELECTRET MATERIAL AND PROCESS FOR PREPARING ELECTRET MATERIAL

Title:

ELECTRET MATERIAL AND PROCESS FOR PREPARING ELECTRET MATERIAL

Document Type and Number:

WIPO Patent Application WO/1989/011156

Kind Code:

A1

Abstract:

This invention relates to an electret material having thermal stability and capable of having high trapped charge quantity and stably existing for a long period of time and a process for preparing said electret material. The electret material of the present invention is characterized in that it comprises 100 parts by weight of polypropylene, 0.01 to 2 parts by weight of at least one stabilizer selected from among hindered amine, nitrogen-containing hindered phenol, and metal-containing hindered phenol stabilizers and that at least part of said propylene has such a molecular weight distribution that the Mw/Mn ratio wherein Mw is a weight-average molecular weight is 5.5 or less. The electret material of the present invention can be widely used for various applications and, e.g., is best suited for use in, e.g., various filter materials, wiper materials, adsorption materials, masking materials, and dust-proof materials.

Inventors:

NISHIURA EIICHI (JP)
ANDO KATSUTOSHI (JP)

Application Number:

PCT/JP1988/001136

Publication Date:

November 16, 1989

Filing Date:

November 11, 1988

Export Citation:

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Assignee:

TORAY INDUSTRIES (JP)

International Classes:

D06M10/00; H01G7/02; D06M101/00; D06M101/16; D06M101/18; D06M101/20; D06M101/22; (IPC1-7): H01G7/02

Foreign References:

JPS60225416A

1985-11-09

Other References: