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    ELECTRET MATERIAL DIVIDED INTO SEA AND ISLAND REGION AND ITS PRODUCTION
    22.
    发明专利
    ELECTRET MATERIAL DIVIDED INTO SEA AND ISLAND REGION AND ITS PRODUCTION 失效

    公开(公告)号：JPH06123063A

    公开(公告)日：1994-05-06

    申请号：JP26889592

    申请日：1992-10-07

    Applicant: TORAY INDUSTRIES

    Inventor： ANDO KATSUTOSHI ,  KONDO GORO

    IPC: B01D39/14 ,  D04H1/541 ,  D06M10/00 ,  D04H1/54

    Abstract: PURPOSE:To obtain an electret material having strong electric action on the outside and stable electric charge for a long period of time. CONSTITUTION:An electret material comprises positive and negative charges divided into a sea and an island regions on the surface wherein the whole area ratio of island region of positive or negative electric charge on the surface is 25-60%, the whole area ratio of sea region of the opposite electric charge on the back is 40-95% and the polarity of both the surface and the back is opposite polarity on the whole.

    CHARGED PATTERN FORMING METHOD
    23.
    发明专利
    CHARGED PATTERN FORMING METHOD 失效

    公开(公告)号：JPH0682503A

    公开(公告)日：1994-03-22

    申请号：JP23702692

    申请日：1992-09-04

    Applicant: TORAY INDUSTRIES

    Inventor： KONDO GORO ,  ANDO KATSUTOSHI

    IPC: G01R29/24

    Abstract: PURPOSE:To provide a method for obtaining an accurate charged pattern for an irregularly charged object or an object having complex charge distribution. CONSTITUTION:A developer 2 composed at least of a magnetic powder and a charged toner is adhered onto the surface of a charged object 3 and then the developer 2, not adhered to the surface of the object 3, is removed by means of a magnet 1 thus forming a charged pattern.

    PRODUCTION OF LEATHER LIKE SHEET ARTICLE
    25.
    发明专利
    PRODUCTION OF LEATHER LIKE SHEET ARTICLE 失效

    公开(公告)号：JPH01148872A

    公开(公告)日：1989-06-12

    申请号：JP30623687

    申请日：1987-12-02

    Applicant: TORAY INDUSTRIES

    Inventor： KONDO GORO ,  KATO HIROYASU

    IPC: D06M15/564 ,  D06M11/00 ,  D06M11/05 ,  D06M11/73 ,  D06M15/00 ,  D06M101/00 ,  D06M101/16 ,  D06M101/30 ,  D06P3/00 ,  D06P5/15

    Abstract: PURPOSE: To obtain a high-quality, uniformly coated leather-like sheet by coating the surface of a fiber sheet of multi-component fibers with a coating material containing a tentatively colored high-molecular-weight polymer, and removing a part of the multi-component fibers and coloring component by extraction with a solvent for decolorization. CONSTITUTION: In this method, a tentatively colored coating material, preferably containing a high-molecular-weight polyurethane polymer, (i.e., colored with a dye having no dyeing affinity for the polymer) is applied to the surface of a fiber sheet of multi-component fibers (e.g. sea-and-island type composite fibers), in which two or more types of very fine polymer fibers showing different solubility in a solvent are entwined with each other by jetting of a high speed fluid, embossing the sheet is embossed, and the sheet is treated with a solvent capable of dissolving part of the multi-component fibers and colored component, to a part of the multi-component fibers and the colored component is decolored and removed, in order to obtain the flexible, uniformly coated, leather-like sheet. Tentatively coloring the sheet facilitates discovery of the uneven coating and decolorization/removal of the unevenly coated portions, and gives a leather- like sheet with silver surfaces, dyed by a desired color.

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