| 摘要 |
<p>The present invention relates to a pressure-sensitive adhesive transfer tape, taking the form of a carrierless adhesive tape with an adhesive layer comprising a pressure-sensitive adhesive based on a poly(meth)acrylate copolymer with the following monomers: a1) acrylic acid and/or acrylic esters of the following formula: CH2═C(R1)(COOR2), where R1=H or CH3 and R2 is an alkyl chain with 1-30 C atoms, a2) olefinically unsaturated monomers with functional groups, with monomers of group a1) being present to an extent of at least 50% by weight, based on the total component (a), and with monomers of group a2) being present at 0%-30% by weight, based on the total component (a), and b) a photoinitiator with a fraction of 0%-5% by weight, based on the overall polymer mixture, the pressure-sensitive adhesive being crosslinked to differing extents on its top and bottom faces by actinic radiation, the crosslinking of the pressure-sensitive adhesive being such that on both its top face and its bottom face it has a PSTC-1 adhesion of at least 1 N/cm and a difference between the adhesion on the top face and on the bottom face of at least 30%, preferably of at least 50%, based on the lower of the two adhesions.</p> |
