Adhesive sheet

An adhesive film comprising:

• a) A flexible substrate with opposing sides;
• b) Pressure sensitive adhesive which is discontinuously coated on at least one side of said substrate to provide areas of the pressure sensitive adhesive interspersed with areas of uncoated substrate;
• the areas of said substrate which are not coated by adhesive being 5 to 80 percent of the area of one side of said substrate;
• wherein,
• i) said substrate has a plurality of microscopic holes connecting said substrate sides and being generally perpendicular thereto;
• ii) transverse dimension of said holes being between about 1 and about 300 micrometers;
• iii) and the size and the areal density of said holes installed in the portions of the substrate uncoated by said adhesive are chosen so that the adhesive film has an air permeability in the range of 1 to 1000 Gurley seconds.

A porous transparent adhesive film;

• said film comprising
• a. a substrate having a plurality of microscopic holes installed therethrough;
• and
• b. a layer of pressure sensitive adhesive applied to one side of said substrate.

A method for fabricating a porous adhesive film comprising the acts of:

• a) Presenting a flexible film substrate having a first surface and a second surface;
• said first and said second surface opposing each other and being substantially mutually parallel;
• b) Applying a layer of adhesive to said second surface;
• c) Installing microscopic holes in said substrate by a method selected from a family consisting of mechanical piercing, electric discharge, and laser drilling.
• wherein said flexible substrate further comprises a finish layer attached to said second surface.