| 摘要 |
A protective polysaccharide film containing a buffering agent in an amount w hich is effective for substantially resisting pH changes due to environmental influence; a solution for the application onto a surfac e to be protected, comprising: a) a polysaccharide disso lved in an aqueous solvent therefore: and b) a buffering agent, said solution being capable of forming a film on said surface which on swell ing or dissolution maintains a substantially constant pH due to environmental influ ence; and a process for protecting a surface from non-de sired contamination and to facilitate the removal of such contamination from said surface, comprising the steps: a) applying a solution ac cording to any of claims 7 to 12 on said surface before being subjected to contamina tion; b) allowing the applied solution to dry with the f ormation of a solid film on said surface, said film being capable of substantially re sisting pH changes due to environmental influence; c) tr eating said film with a liquid capable of redissolving the film or providing swelli ng thereof; and d) removing the undesired contamination by completely or partially removing said film from the surface.
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