Method for temporarily protecting sticky surface and a thus protected adhesive sheet material

Abstract

The present invention provides a unique solution of the difficult problem in the prior art that no efficient peelable release paper is available for temporarily protecting the sticky surface of the adhesive sheet material, e.g. adhesive tapes, adhesive labels, stickers and the like, from inadvertent sticking to an undesired surface when the sticking agent on the adhesive sheet is a silicone-based one. The inventive adhesive sheet material with temporarily protecting covering sheet is formed by use of a sheet of a hydrophilic material such as cellophane impregnated with water in a water content of at least 10% by weight as the temporarily protecting covering sheet. The thus hydrated protecting covering sheet is peelable with a relatively small peeling force without affecting the sticking power of the sticky surface of the adhesive sheet material.

Dependencies are inferred from the claim text.