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    • 95. 发明专利
    • SURFACE SIZE OF PAPER STRUCTURE
    • JPH026690A
    • 1990-01-10
    • JP7071789
    • 1989-03-24
    • SANDOZ AG
    • SEODORU RANGU
    • D21H19/10D21H17/12D21H17/24
    • PURPOSE: To effectively obtain a high-grade paper in a high yield from reusable waste paper by treating a surface-flat structure made of paper stuff with a sizing composition containing chitosan and a specified complex as sizing active components. CONSTITUTION: A surface-flat structure having at least 60 g/m weight (e.g. cardboard, board or the like) is obtained using wood fibers, reusable waste paper or the like, as raw materials. (A) Chitosan preferably having a molecular weight of 5×10 -5×10 protonated with hydrochloric acid, acetic acid or the like and (B) a (12-22C fatty acid)-Cr (III) complex obtained by allowing a 12-22C fatty acid to react with basic chromium chloride in alcohol are blended in a weight ratio A:B of 1:0.2 to 1:5 (the component A shows weight before protonation). The blend is adjusted to pH 3-6, applied to the surface of the structure by 0.005-0.3 g/m with an air knife or the like and dried to obtain the objective paper.