Patent ID: 8357449

Claim:
A self-adhesive tape comprising a laminate including at least a first pressure-sensitive adhesive (PSA) layers A and a second pressure-sensitive adhesive (PSA) layer B, each layer having a lamination surface and wherein layer A and layer B are directly laminated to one another at their respective lamination surfaces, and wherein at least one of the lamination surfaces has been chemically and/or physically pretreated prior to lamination, wherein the shear strength t s A/B of the self-adhesive tape at 25° C., 40° C. and 70° C. under a weight load of 1000 g being at least 80% of the shear strength t s o of the PSA layer A and/or of the PSA layer B, where t s o represents the shear strength of the PSA layer having the lower shear strength, and wherein the at least first and second pressure-sensitive adhesives are composed of a copolymer of at least a first monomer having 70% to 100% by weight of acrylic esters and/or methacrylic esters and/or their free acids, with the following formula CH 2 ═CH (R 1 )(COOR 2 ), where R 1 ═H and/or CH 3 and R 2 ═H and/or alkyl chains having 1 to 30 C atoms and being linear, branched and/or containing cyclic structural elements, and a second monomer having 0% to 30% by weight of olefinically unsaturated monomers.