Pressure sensitive adhesive comprising: - an at least partly crosslinked polyacrylate based on a monomer mixture, the monomer mixture comprising a) 5 to 100 wt% of acrylic esters of the formula CR 3 2 = C(R 2) (COOR 1) as monomers A, where R 1 is a branched alkyl group having 16 to 22 C atoms which has at least two branching sites, R 2 is selected from H, methyl or halogen, and R 3 independently at each occurrence is selected from H or halogen, b) 0 to 20 wt% of acrylic acid of the formula CR 5 2 = C(R 4) (COOH) as monomers B, where R 4 is selected from H, methyl or halogen, and R 5 independently at each occurrence is selected from H or halogen, c) 0 to 30 wt% of olefinically unsaturated monomers having at least one functional group as monomers C, where the monomers C do not fall within the monomers A, B, and D, and d) 0 to 95 wt% of acrylic esters of the formula CR 8 2 = C(R 7) (COOR 6) as monomers D, where R 6 is a linear, singly branched, cyclic or polycyclic alkyl group having 1 to 14 C atoms, R 7 is selected from H, methyl or halogen, and R 8 independently at each occurrence is selected from H or halogen; - at least one tackifying resin, which is present in a proportion of 20 to 60 parts by weight per 100 parts by weight of polyacrylate. - an at least partly crosslinked polyacrylate based on a monomer mixture, the monomer mixture comprising a) 5 to 100 wt% of acrylic esters of the formula CR 3 2 = C(R 2) (COOR 1) as monomers A, where R 1 is a branched alkyl group having 16 to 22 C atoms which has at least two branching sites, R 2 is selected from H, methyl or halogen, and R 3 independently at each occurrence is selected from H or halogen, b) 0 to 20 wt% of acrylic acid of the formula CR 5 2 = C(R 4) (COOH) as monomers B, where R 4 is selected from H, methyl or halogen, and R 5 independently at each occurrence is selected from H or halogen, c) 0 to 30 wt% of olefinically unsaturated monomers having at least one functional group as monomers C, where the monomers C do not fall within the monomers A, B, and D, and d) 0 to 95 wt% of acrylic esters of the formula CR 8 2 = C(R 7) (COOR 6) as monomers D, where R 6 is a linear, singly branched, cyclic or polycyclic alkyl group having 1 to 14 C atoms, R 7 is selected from H, methyl or halogen, and R 8 independently at each occurrence is selected from H or halogen; a) 5 to 100 wt% of acrylic esters of the formula CR 3 2 = C(R 2) (COOR 1) as monomers A, where R 1 is a branched alkyl group having 16 to 22 C atoms which has at least two branching sites, R 2 is selected from H, methyl or halogen, and R 3 independently at each occurrence is selected from H or halogen, b) 0 to 20 wt% of acrylic acid of the formula CR 5 2 = C(R 4) (COOH) as monomers B, where R 4 is selected from H, methyl or halogen, and R 5 independently at each occurrence is selected from H or halogen, c) 0 to 30 wt% of olefinically unsaturated monomers having at least one functional group as monomers C, where the monomers C do not fall within the monomers A, B, and D, and d) 0 to 95 wt% of acrylic esters of the formula CR 8 2 = C(R 7) (COOR 6) as monomers D, where R 6 is a linear, singly branched, cyclic or polycyclic alkyl group having 1 to 14 C atoms, R 7 is selected from H, methyl or halogen, and R 8 independently at each occurrence is selected from H or halogen; - at least one tackifying resin, which is present in a proportion of 20 to 60 parts by weight per 100 parts by weight of polyacrylate.