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    2.
    发明专利
    未知

    公开(公告)号：DE68919363T2

    公开(公告)日：1995-03-30

    申请号：DE68919363

    申请日：1989-05-26

    Applicant: TORAY INDUSTRIES

    Inventor： ANDO KATSUTOSHI ,  TOGASHI RYOICHI

    IPC: A42B1/04 ,  A42B1/18

    Abstract: PCT No. PCT/JP89/00532 Sec. 371 Date Mar. 25, 1991 Sec. 102(e) Date Mar. 25, 1991 PCT Filed May 26, 1989 PCT Pub. No. WO90/14024 PCT Pub. Date Nov. 29, 1990.A dust-proof headgear which, although having a simple construction, exhibits an excellent dust-proof performance to thereby remarkably reduce a scattering of hair, dandruff and dust from the wearer's head, while exhibiting a high air-permeability to thus eliminate any feeling of sultryness or stuffyness even when worn for a long time. The dust-proof headgear is made of a material having, as a major component thereof, an electret non-woven fabric having a surface electrostatic charge density of 1x10-10 Coulomb/cm2 or greater and an air-permeability of between 10 cc/cm2.sec and 1000 cc/cm2.sec. The headgear of the invention is highly effective for use in various fields of industry in which environmental contamination by contaminants from the heads of workers or habitants is strictly forbidden, e.g., the foodstuff industry, electronic industry, precision machining industry, and medical industry.

    8.
    发明专利
    未知

    公开(公告)号：DE68919363D1

    公开(公告)日：1994-12-15

    申请号：DE68919363

    申请日：1989-05-26

    Applicant: TORAY INDUSTRIES

    Inventor： ANDO KATSUTOSHI ,  TOGASHI RYOICHI

    IPC: A42B1/04 ,  A42B1/18

    Abstract: PCT No. PCT/JP89/00532 Sec. 371 Date Mar. 25, 1991 Sec. 102(e) Date Mar. 25, 1991 PCT Filed May 26, 1989 PCT Pub. No. WO90/14024 PCT Pub. Date Nov. 29, 1990.A dust-proof headgear which, although having a simple construction, exhibits an excellent dust-proof performance to thereby remarkably reduce a scattering of hair, dandruff and dust from the wearer's head, while exhibiting a high air-permeability to thus eliminate any feeling of sultryness or stuffyness even when worn for a long time. The dust-proof headgear is made of a material having, as a major component thereof, an electret non-woven fabric having a surface electrostatic charge density of 1x10-10 Coulomb/cm2 or greater and an air-permeability of between 10 cc/cm2.sec and 1000 cc/cm2.sec. The headgear of the invention is highly effective for use in various fields of industry in which environmental contamination by contaminants from the heads of workers or habitants is strictly forbidden, e.g., the foodstuff industry, electronic industry, precision machining industry, and medical industry.

    9.
    发明专利
    未知

    公开(公告)号：DE3887337D1

    公开(公告)日：1994-03-03

    申请号：DE3887337

    申请日：1988-11-11

    Applicant: TORAY INDUSTRIES

    Inventor： NISHIURA EIICHI ,  ANDO KATSUTOSHI

    IPC: D06M10/00 ,  D06M101/00 ,  D06M101/16 ,  D06M101/18 ,  D06M101/20 ,  D06M101/22 ,  H01G7/02

    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.

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