PROTECTIVE POLYSACCHARIDE FILM, SOLUTION FOR APPLYING THEREOF TO A SURFACE TO BE PROTECTED, METHOD OF PROTECTION A SURFACE FROM UNDESIRED CONTAMINANTS AND FOR FACILITATING THE REMOVAL OF SUCH CONTAMINANTS

摘要

The present invention relates to 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 therefor; and b) a buffering agent wherein 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 the above described solution to said surface before being subjected to contamination; b) allowing the applied solution to dry with the formation of a solid film on said surface, wherein 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.