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    • 4. 发明公开
    • PROTECTIVE POLYSACCHARIDE FILM
    • 防护多糖膜
    • EP0751837A1
    • 1997-01-08
    • EP95914642.0
    • 1995-03-23
    • Polysaccharide Industries Aktiebolag PSI
    • SVENSSON, Sigfrid
    • B05D5B08B17C09D5C09D101C09D103C09D105
    • B05D5/00B08B17/00C09D5/008C09D101/284C09D105/00C09D105/14
    • A protective polysaccharide film containing a buffering agent in an amount which is effective for substantially resisting pH changes due to environmental influence; a solution for the application onto a surface to be protected, comprising: a) a polysaccharide dissolved in an aqueous solvent therefore; and b) a buffering agent, said solution being capable of forming a film on said surface which on swelling or dissolution maintains a substantially constant pH due to environmental influence; and a process for protecting a surface from non-desired contamination and to facilitate the removal of such contamination from said surface, comprising the steps: a) applying a solution according to any of claims 7 to 12 on said surface before being subjected to contamination; b) allowing the applied solution to dry with the formation of a solid film on said surface, said film being capable of substantially resisting pH changes due to environmental influence; c) treating said film with a liquid capable of redissolving the film or providing swelling thereof; and d) removing the undesired contamination by completely or partially removing said film from the surface.
    • 一种含有缓冲剂的保护性多糖膜,其含量对于基本上抵抗由于环境影响引起的pH变化是有效的; 一种用于施用到要保护的表面上的溶液,其包含:a)因此溶解在水性溶剂中的多糖; 和b)缓冲剂,所述溶液能够在所述表面上形成膜,所述膜在膨胀或溶解时由于环境影响而保持基本恒定的pH; 以及用于保护表面免受不希望的污染并且有助于从所述表面去除这种污染物的方法,该方法包括以下步骤:a)在受到污染之前将权利要求7-12中任一项的溶液施加到所述表面上; b)使所施涂的溶液干燥,在所述表面上形成固体膜,所述膜能够基本上抵抗由于环境影响而引起的pH变化; c)用能够再溶解膜或提供其溶胀的液体处理所述膜; 和d)通过从表面完全或部分地除去所述膜来去除不希望的污染物。