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    • 3. 发明专利
    • ENVELOPE COVER SHEET AND ENVELOPE
    • JPH01294441A
    • 1989-11-28
    • JP11857288
    • 1988-05-16
    • HONSHU PAPER CO LTD
    • ITO TOSHITAKESAKAI TAKAYUKISOMA TARO
    • B65D27/00B42D15/02
    • PURPOSE:To improve the imprinting property and writing property, and obtain an envelope cover sheet which is equipped with a transparency for an envelope cover, by applying a pigment layer of silicon dioxide on the surface of a paper with transparency or a transparent plastic film. CONSTITUTION:It is an envelope cover sheet for which a pigment with transparency or a mixed layer of a transparent pigment and water absorbent polymer is applied on the surface of a paper with transparency or transparent plastic film. As the paper with transparency, generally a paper with transparency is enough, and to have lower than 20% of opacity is required. As the transparent plastic film, a film of polyester, polypropylene, etc. is used. As the pigment for the pigment layer with transparency, a silicon dioxide, such as fine grain amorphous silica, colloidal silica, etc. can be counted. The fine grain amorphous silica is preferable among them. For the pigment layer, a pigment with transparency is dispersed on a synthetic resin of acrilic, polyester, or vinyl acetate, and cellulosic derivative, etc. to make a coating material, and this coating material is applied on a paper with transparency or transparent plastic film to form the pigment layer.