A pressure sensitive adhesive obtainable by free-radical polymerization, characterized
in that
- at least 65% by weight of the adhesive is based on at least one acrylic
monomer from the group of the compounds of the following general formula:
##STR1##
- where R1=H or CH3 and the radical R2=H
or CH3 or is selected from the group consisting of branched or unbranched
saturated alkyl groups having 2-20 carbon atoms,
- the average molecular weight of the adhesive is at least 65,000,
- applied to a carrier, the adhesive possesses a preferential direction,
where the refractive index measured in the preferential direction nMD
is greater than the refractive index measured in a direction perpendicular to the
preferential direction nCD, the difference n=nMD-nCD
being at least 110-5.
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