FIELD: chemistry.
SUBSTANCE: sheet has a base and a pressure sensitive adhesive layer. Material of the base has the following characteristics: surface roughness (Ra) not less than 0.03 mcm, lightness value (L*) in colour scheme L*a*b* not greater than 60 if the colour index (C*) is not greater than 60, lightness value (L*) not greater than 85 if colour index (C*) is not greater than 60, and contrast coefficient not less than 90%. The pressure sensitive adhesive layer has several through-openings passing from one surface to the other surface of the pressure sensitive adhesive sheet. The openings are made using a laser beam with distribution density ranging from 30 to 50000 openings per 100 cm2. The fused parts formed when processing with the laser have outer diametre of not greater than 50 mcm. Thermally deformed parts around the fused parts have outer diametre of not greater than 180 mcm.
EFFECT: obtained adhesive sheet prevents formation of air bubbles and swelling when stuck on various surfaces.
3 cl, 17 ex, 5 dwg
